Exhaust fan اگزاست فن مکنده

Exhaust fan

As you know, the Exhaust Fan is responsible for creating an induced flow in the air and moving the air from one point to another, and depending on its efficiency, it is divided into two general categories: blower and sucker. In industrial and domestic applications, where exhaust fans are used all over the world today, suction fans are mostly used for air exchange (hot air, unfavorable and toxic air). This means that the exhaust vent by the exhaust fan has a higher priority than the supply of fresh air by the supply fan.

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Internal components of exhaust suction fan

To better understand the exhaust fan, it is better to take another look at the structure of the exhaust fan. The general structure of the exhaust fan produced by Damagester Company consists of different parts, which are:

• Electromotor: Motor is the driving force for the suction fan to rotate. At the request of the customer, Damagester Company uses domestically made electric motors (electrogen or motogen) as well as European brand motors such as Siemens or Russian for the exhaust fan of its production. The driving force or power consumption of the electromotor is selected for the exhaust fan suction based on the calculated volumetric flow rate of the air flow. The volumetric flow of induced air sucked by the Air Flow is expressed in cubic meters per hour (m3 / h) or cubic feet per minute (CFM). The electromotor of choice for exhaust fan suction has different types including synchronous and incynchronous and with different degree of protection (IP55 or IP54 or IP44) will be available.
• Blade Fan: Exhaust fan has forward, backward, radial and airfoil impeller which is designed and produced depending on the need for exhaust fan. The impeller causes air to flow inward by causing a local pressure drop in the exhaust fan
• Hosing: The main location of the impeller inside the exhaust fan is the housing or the so-called helical fan. A screw in the exhaust suction fan is responsible for collecting and directing the sucked air to the outside environment. The helical section is also responsible for securing the impeller against the entry of foreign objects into the exhaust fan.
• Coupling: This section is responsible for transferring power from the motor to the fan. The power transmission shaft in the exhaust fan is one of the important components because it transmits the generating driving force to the impeller. The transfer of electromotor output torque to the exhaust in suction fan exhaust is done in three ways. These three methods include direct connection, connection by money and connection belt with gearbox.
• Mechanical Seal: This part is responsible for maintaining the motor and power transmission shaft, and the use of this part will reduce the depreciation of fan and motor parts over time.
• Air inlet and outlet channel (Inlet @ Outlet Vent): This section is the main place of air inlet and outlet in the exhaust fan, which the use of circular sections greatly reduces the pressure drop and also reduces the noise produced in the exhaust fan. Be.
• Exhaust fan chassis: This part is where the exhaust fan is placed on the roof or other environment, which includes a chassis consisting of studs or H iron.
• Vibration damper or motor handle: One of the most important components that have a significant impact on reducing the level of sound produced by the device and reducing vibrations is the same vibration damper or so-called motor support handle that is used in residential environments (restaurants, buildings and offices) Highly recommended.

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Exhaust fan classification based on user type

Suction fan exhaust is divided into ceiling (fungal), inter-channel, axial (centrifugal), centrifugal and utility categories in terms of efficiency. Axial fan and centrifugal fan in exhaust suction fan means which type of fan it works with. Each fan has its own characteristics and specifications. The centrifugal fan reduces the pressure and suction of the air by creating a centrifugal force in the exhaust of the suction fan, while the axial fan reduces the pressure and suction of the air by creating a turbulent flow in the exhaust of the suction fan. Exhaust fungal suction fan is installed on the roof and depending on the type of centrifuge or axial, it causes air to be sucked out of the building.

The argument we have always faced in air transfer in ducts is the drop in static air pressure per 10 meters of duct length. To solve this problem, we use an exhaust suction fan along the channel. It is also used because of the design and space constraints that can not be used with other exhaust fans. This type of suction fan is suitable for draining large amounts of moisture and heat.

When our desired location is such as hotels and tall buildings, instead of using a large number of exhaust fans, we use the integrated type, which has multiple inputs and also has high suction power, such as utility exhaust fans.

What is the reason for the loud noise generated in the exhaust fan and what is the solution to this issue?

Exhaust fan, like other air conditioning equipment, may sometimes cause a lot of noise and vibration due to non-compliance with production and installation standards. Exhaust fan can generally be installed in residential, office and commercial environments, depending on its type of use. And the loud noise generated by the exhaust fan can cause harassment to the residents of that area. The factors that cause noise and intensification of vibrations in the exhaust fan are as follows.

• Poor body Exhaust body Air exhaust fan
• Failure to comply with the principles on how to couple and transfer power from the engine to the impeller
• The type of blade or blade used in the exhaust fan impeller
• Fan rotation angle speed (fan speed)
• Inlet and outlet section of air suction and blowing duct (circular or rectangular)

There are different ways to prevent the problems of sound production and vibrations produced by the exhaust fan, and Damagaster Company is a leader in using these ways. Polymeric materials such as PVC or fiberglass FRP can be used in the production of the fan body to prevent the creation and intensification of vibrations in the body of the exhaust fan. In order to produce the body and assemble this device, instead of turning the edges together (bending the body sheets), they can be connected to each other by welding, which has a significant effect on reducing the vibration produced by the exhaust suction fan. In order to reduce the exhaust sound of the suction fan, our recommended solution is to use a fan box and a PLUG FAN.

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Types of exhaust fan

As you know, the exhaust fan is classified into different types depending on the type of impeller and the model of blades used in it. In fact, based on the appearance of the type of blade and blade used in the impeller, exhaust fan is divided into the following types.

• Forward Exhaust Fan
• Backward Exhaust Fan Backward
• Radial Suction Exhaust Fan
• Exhaust fan Backward Airfoil

Forward impeller in exhaust suction fan

The forward centrifugal exhaust fan impeller has more blades than the backward fan fan impeller. The forward bent blades make much less noise than other blades. In this type of exhaust fan, the impeller blades have a forward curvature in the direction of rotation of the impeller.

Exhaust forward suction fan is used to move clean air due to its high sensitivity to solid particles suspended in the air. This type of exhaust fan has a low production noise and is also suitable for installation inside the environment. Due to having more blades than others, the forward exhaust fan has the problem of being consumed sooner. The efficiency of this type of exhaust fan is low and about 55 to 65. Forward exhaust fan is used to produce low flow and create low pressure drop.

Backward butterfly in exhaust fan

Exhaust fans of Beckward suction cups are cylindrical. The impeller blades are convex. Their curvature is opposite to the direction of rotation of the impeller. Smaller blowers have sloping blades that are not curved instead of convex blades. This type of exhaust fan is used to create air flow with higher speed and pressure. This type of exhaust fan has a higher efficiency compared to the forward and radial type. They are more economical for high energy applications than other types of exhaust fans.

Radial Exhaust Fan (Radial)

In this exhaust, the blade suction fans are straight and without curvature, and therefore they have the lowest sensitivity to dust compared to the rest of the suction fan exhausts. Radial blades produce the greatest static pressure drop, which significantly reduces the efficiency of the exhaust fan. This type of exhaust suction fan is used to move and transport particles. Radial exhaust fan is used for high pressure and low flow and also produces a lot of noise.

Exhaust fan Suction Beard Airfoil

This type of exhaust suction fan is the same type of backboard that has an airfoil-like blade. This exhaust fan has the highest efficiency and the lowest output noise. It is also used to produce high flow rates. This type of exhaust fan is not suitable for chemical and corrosive applications due to the low contact angle of the blade, and instead it should use a normal Beacon exhaust fan.

History of cooling tower تاریخچه برج خنک کننده

History of cooling tower

Cooling Tower (Cooling Tower) in general, the term cooling tower has had many applications in the global industry and throughout history. The first works of design of cooling towers or cooling towers can be seen in ancient Egypt in order to cool the water used for bathing and by spraying the free flow of water stream on the man-made rocks. After many years, humans used this device in many cases without knowing the technical knowledge and design of the cooling tower and even without knowing the name and design knowledge of the cooling tower.

After the European Industrial Revolution and the growth of industry in the world, the direct use of water from rivers, streams, lakes and wells to cool industrial devices expanded. For years, the method of direct use of natural resource water to cool industrial equipment was the first choice of large industrial plants. After several decades and the increasing reduction of natural resources, many factories due to lack of water resources or environmental effects of excessive water consumption and also increasing pollution of water resources to find a suitable solution to return water consumption from natural resources and combat The above problems (cooling tower), acted.

The first cooling tower, called Cooling Water Builder, was placed in the way of river water, and in this work cycle, in order to return the hot water used by rivers in industrial factories, it was put into orbit. Early cooling towers often had very large concrete structures. Concrete cooling towers have been used since the European Industrial Revolution. Today, cooling towers with concrete structures are generally used in hyperbolic and cubic shapes in the power plant and petrochemical industries in the country. This model of cooling tower is also called power plant cooling tower.

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The next generation of cooling towers over time is the wooden cooling tower. The wooden cooling tower was generally considered a suitable alternative to the concrete cooling tower in smaller scales due to its faster construction and lower weight. In the wooden cooling tower, the first type of cooling tower packing with wooden structure was used.

After a while, the wooden cooling tower was completely removed from the industrial application circuit due to insufficient resistance to rot and sunburn, as well as due to water absorption and deformation over time in its structure, and galvanized cooling tower or Galvanized cooling tower with centrifugal aeration system replaced wooden cooling tower.

Galvanized cooling tower was a good alternative to wooden cooling tower due to its higher resistance to decay, no deformation and more stable structure. Eventually, the galvanized cooling towers were also reactive to water, and the effects of rust, rot, and the growth of microorganisms (sludge) were quickly seen. Galvanized cooling tower repairs, or so-called metal cooling towers, were extremely difficult due to rusting connections and lack of easy access to the internal components of the cooling tower.

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For the above reasons, the latest generation of cooling towers, called fiberglass cooling towers, have completely replaced concrete, wood and galvanized cooling towers. Fiberglass cooling tower A type of cooling tower with a composite or fiberglass structure has numerous advantages over its previous models, which we will mention briefly.

1- Lightness and portability of fiberglass cooling tower

2. Easy maintenance of fiberglass cooling towers compared to various types of galvanized cooling towers and concrete cooling towers

3. No penetration of sunlight (lack of absorption of solar radiation due to the apparent white color of the body) into the fiberglass cooling tower

4- No reaction with water or in other words no rot and rust of the fiberglass body of the cooling tower against water

5. Lack of growth of bacteria, microorganisms and sludge in the pan of fiberglass cooling tower

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Fiberglass Cooling Tower is an all-composite body made of suitable fibers and resins. Fiberglass cooling tower is produced and designed today in various types of open circuit cooling towers and closed circuit cooling towers. The new generation of cooling towers with the aim of reducing the compensatory water consumption of the cooling tower, reducing the amount of sediment in the cooling tower and in general with the aim of optimizing the energy consumption of the cooling tower, called hybrid cooling tower and evaporative cooling tower or evaporative condensers. evaporative condenser) has replaced a variety of open circuit cooling towers.

In a general statement, it can be said that all industrial and non-industrial equipments used by human beings have undergone many changes over time, and the cooling tower, like many other industrial equipments, has undergone many changes and transformations. Cooling tower On the one hand, in terms of the quality of materials used in the production of this device, and on the other hand, in the overall design of the cooling tower, general changes can be seen.

In order to improve the quality of its products as much as possible, especially the cooling tower, Damagostar Company intends to take steps with the latest technical knowledge of the world and by using the unremitting efforts of its engineers. The cooling tower of Damagester company is produced in different types and in different application directions in accordance with the up-to-date knowledge of the world and is in the service of the country's industry.

Cooling tower dropper قطره گیر برج خنک کننده

Cooling tower dropper

: 4.5 out of 5

The Drift Eliminator is a trap for trapping water droplets sucked into the air outlet in the cooling tower. The main function of this section is to prevent water droplets from drifting or falling towards the impeller Is a fan). In fact, the word Drift Eliminator in English consists of two main parts. The first part of the word (Drift) means throwing small drops of water from the outlet of the cooling tower nozzle towards the fan and the second part of the word (Eliminator) means the eliminator.

Types of applications for drippers or drippers (eliminator)

In addition to being used in cooling towers, drippers are also used in a variety of air washers and evaporative condensers. Due to its protective role, it is considered as one of the most important parts of the cooling tower . Takes. In order to increase the efficiency of the dripper, in some cases, two or more layers of drippers are generally used to prevent water droplets from escaping.

The standard height of the drippers used in the cooling tower and air washer varies between 13 to 20 cm and varies according to the type of dripper (honeycomb or blade). The amount of water droplets or droplets thrown towards the impeller is not more important in terms of energy consumption (water consumption), but the use of the eliminator in the air outlet in devices that deal with water spraying (such as cooling towers) has a greater protective role of parts. It is responsible for being in contact with the exhaust air. Some of these components include the engine, fan or impeller of the cooling tower and the transmission system.

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How the cooling tower dripper works

When the fan in the cooling tower sucks the air flow upwards with a certain pressure from the Louvre (air inlet shutter), a small rate of droplet outlet of the cooling tower nozzle nozzle is due to the suction force of the impeller. It is directed to the fan deck output. These droplets of water lose their force (trapped induction suction force) in the collision with the plates and dripping blades of the cooling tower and return to the bottom (packing media) due to their gravitational force. Simply put, the cooling tower drip trap is a kind of trap in the path of water droplets sucked towards the impeller, which prevents the exit of these small and macroscopic water droplets (Drift).

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Application and location of cooling tower dripper

Drippers or drippers are used in various types of cubic and conical cooling towers (open circuit) as well as in different capacities of hybrid CCTV cooling towers. In addition to the cooling tower, this equipment is also used in various types of air washers, and its purpose is to prevent droplets and water vapor from passing out of the device, and by creating a contact surface, it causes condensation or dew of some of the droplets and existing moisture. It circulates in the air and hence it is also called dewdrop. The importance of the drip trap is more due to the direct effect of this part on the water consumption of the cooling tower and air washer. Incidentally, in order to reduce the amount of water consumption in the calculations of the cooling tower, the use of drip traps or dew traps is highly recommended.

In the cubic cooling tower, the location of the dropper is located at the top of the nozzle (nozzle) and before the fan or fan section. The droplets coming out of the nozzle in the cubic cooling tower are returned downwards by the dropper. In a conical cooling tower, a dripper or eliminator is connected to the top of the sprinkler or water dispenser outlet pipes on the pipe by a clamp, and water droplets and vapors from the holes of the rotating water spray system after hitting this type of drop. The traps are deflected downwards. In common parlance, a conical or circular cooling tower drip is also abbreviated as an eliminator.

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Cooling tower drip material

Cubic cooling tower drippers are produced and supplied in two types of honeycomb or cellular and blade type. Due to the constant contact of the cooling tower drip or dew trap with the humid air flow and water droplets, this equipment is generally made of polymeric materials. The main material of the cooling tower dripper is generally either PVC (polyvinyl chloride) or in some species PP (polypropylene) material is used in the production and design of the dripper.

Eliminators or conical cooling tower drippers are also generally made of PP and fiberglass FRP. All three materials, PVC, PP and FRP, have good resistance to sediment, corrosion and rot against water, and in fact, the main reason for choosing these three grades of materials in the construction of cooling tower drippers is the above reasons.

Blade and honeycomb drippers are produced by extruder (continuous injection and forming) and then assembled by special granule adhesive and spacer (filling distance). Blade drippers are extruded to specific lengths and then placed side by side between 10 and 12 fillers. The width created by each complete drip set is equal to the width of the 33 cm blades, which are coiled together as male and female. The injection of blade-shaped blades of blade drippers is adjusted to a thickness of 500 to 800 microns, and the produced sheets are produced and supplied as single-chamber and double-chambered.

Granular grade used in blade drippers made of polypropylene grade copolymer material with the highest percentage of transparency and impact, which at a temperature between 150 to 200 degrees under the process of melting and forming sinusoidal sheets. The grade of granulation used in the injection of drip-shaped block molds of honeycomb is of different grades in black, gray and white colors. Lighter draft grades have more flexibility and resistance than dark grades.

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Advantages of using a drip trap in a cooling tower

• Prevent excessive consumption of water by drift or dropping drops in the drip trap

• Prevent droplets from entering the fan and damaging the impeller, motor and cooling tower aeration system

• Increase the service life of aeration system components by reducing the amount of drift in the cooling tower

• Reduce the amount of TDS by reducing the amount of water thrown in the cooling tower

• No sedimentation and corrosion against water and moisture in the air

• High resistance to sunburn and UV radiation in polypropylene grade

• High resistance to acid leaching and acid vapors in the air (scrubber)

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Types of cooling tower drippers

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1- Cooling tower honeycomb drip catcher:

This drip model is used in all types of open circuit cooling towers and closed circuit cooling towers  and is in fact the most widely used type. The name of the honeycomb drip extractor is derived from the appearance and regular hexagonal geometric shape (similar to a honeycomb) of this equipment. Honeycomb drip extractors are generally produced from PVC sheets with a thickness of 500 to 800 microns. These polyvinyl chloride sheets are bonded together by special granular adhesives in the molding machine. In fact, the honeycomb dripper has a very high efficiency in preventing drift in the cooling tower due to its network structure. The passage of water droplets after using the eliminator is about 0.002% of the total water droplets. 

This model of cooling tower shock absorbers is used in various types of cubic and even conical cooling towers due to its high efficiency. In circular or cylindrical cooling towers, the cut view of cellular drip blocks is used for arrangement near the fan section. To maintain the dripper in this case, restrained supports are used on the body (panel).

In some cases, half of the dripper is used in the Louvre of the cooling tower, in which case due to direct sunlight, after a short time, the PVC material will be crushed and the dripper used in the Louvre of the cooling tower will be destroyed. Went. Therefore, it is strongly recommended not to use pivot-type louvers (honeycomb) in the cooling towers of the opposite current and cross current. Instead of using honeycomb louvers, use a variety of fiberglass blades in the cooling tower.

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Types of Honeycomb Drip Cooling Tower

Honeycomb drippers can be produced and supplied in three different grades of PVC material. Based on the percentage of polyurethane used in the raw material granules, the production structure of this equipment is presented in three grades: white, gray and black. Nesting drip traps are generally produced and supplied in 30 cm and 60 cm width and 13 cm in height in block form.

Technical specifications of cooling tower honeycomb drippers:

Sheet thickness: between 400 to 800 microns

Block dimensions: 120 by 30 cm at a height of 13 cm

Material used: PVC granules (polyvinyl chloride)

Usage: Cooling tower - Air washer - Evaporative condenser - Inlet air filter (Louvre)

Step or distance between both ups and downs in cell structure: 19 mm

Grade 3 cooling tower nest drip trap:

The black grade of the cooling tower nest drip trap is actually produced from the mill of raw granule raw materials without the use of a percentage of polyurethane. This grade of products is actually very brittle, and also has a low temperature resistance to heat. Drip black grid is commonly used in environments without direct sunlight and in simple applications in all types of open circuit cooling.

Grade 2 cooling tower nest drip trap:

Gray Drip Gray Drip Cooling Tower Cooler actually contains 20% of polyurethane material mixed in granules. This drip trap is more flexible compared to Grade 3 and the temperature tolerance of this equipment is 55 to 60 degrees Celsius. Grade Tooth cooler's drip trap drip also has a very high resistance to direct UV (sunlight) radiation due to its Unti UV material. This drip model is used in all types of open circuit and hybrid cooling towers.

Grade 1 Cooling Tower Drip Clamp:

The cooling grade of the cooling tower nest drip tray contains 60% polyurethane. This model actually has a lot of flexibility and longevity compared to the two grades of gray and black. Grade 1 nest retarder has a cellular structure.

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2- Cooling tower blade dripper:

What Khgyr blade (Blade Type Eleminator) each of Brjkhnkknndh Shbnmgyr is that most of the material PP (polypropylene) is produced. This dewatering model has a blade-shaped structure that is connected to each other by a spacer. The cooling tower blade dripper has a height of 15 cm compared to the cellular or nesting type and requires more space during installation in the cooling tower.

Cooling tower blade dripper has a droplet permeability of up to 0.005 %, so it has a lower efficiency than nest dripper, but it is generally produced and designed from PP or polypropylene, so it has a higher thermal resistance than PVC dewatering types. Also, the nesting model has acid washing and descaling capability due to its high chemical resistance, which means that in each period of repairs and inspections by acid washing, it can remove all the sediment created by the flow of water and air humidity.

The spacer is actually the creator who creates the distance between the drip blades or the eliminator, which is why this equipment is also called the filling space. The distance between the fillers used in the drip trap is generally made of polypropylene or PP material by plastic injection method by devices under 200 g. The produced spacers are coiled together as male and female and are placed next to each other in 10 -11 and 12-type types. The function of the spacer is to create a standard distance between the two drip blades in the cooling tower or air washer.

Types of cooling tower blade drippers

• Single-bladed blade dripper

This drip model is mostly used in all types of reverse flow cubic cooling towers and has a height equal to 15 cm and has many applications in catching water droplets at the fan outlet. This drip model is placed horizontally on the pipe and fittings of the water spray section. Single-bladed blade drippers generally have a cross-section in the shape of a mountain or hump, which is why this equipment is named.

• Dual-bladed blade dripper

This model is an eliminator or drip in the form of English letters W and has two protrusions in its cross section. This model of dripper is mostly used in all types of air washers and evaporative condensers installed vertically. The production material of this equipment is R-grade polypropylene, which is available in blue and white colors.

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3- Cooling tower fiberglass eliminator

The cooling tower eliminator is a type of drip trap in the cooling tower that is responsible for preventing the droplets from coming out of the sprinkler or water dispenser pipes in the conical cooling tower. The finisher is usually known as the fin eliminator because of its fin-shaped appearance.

These eliminators are only used in the conical cooling tower. The eliminator is mounted on top of the sprinkler outlet pipes and is connected to the outlet pipe by a clamp. Cooling tower eliminators are generally made of FRP fiberglass or PP polypropylene.

The thickness of the eliminator or drip blades of a conical cooling tower is between 600 and 800 microns. This type can be installed as a blade with a width of 15 to 25 cm on sprinkler outlet pipes with a capacity of 30 tons to 1250 tons of refrigeration. Drift output decreases to less than 0.008 % of water droplets with the addition of the eliminator.

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Price of cooling tower dripper

The price of a dropper varies depending on the volume and amount of purchase. The price of a dripper in a cooling tower varies depending on the type (blade or honeycomb) as well as the type of material used. The price of a blade dewater is higher than the price of a honeycomb in a cooling tower. The material used in the blade model (PP) has caused a price difference between the honeycomb model and the blade in the cooling tower. The exact cost estimate of this equipment can be changed according to the following factors.

• A) The type of dew trap has the greatest impact on the price of this equipment in the cooling tower ++.
• B) Material and material is also considered as the most influential item in the final estimate of the price of the cooling tower dripper.
• C) Thickness and weight can also have a significant effect on the price of this product.
• D) The daily price of the raw material of granules and polypropylene or fibers and resin (in the cooling tower eliminator) will naturally increase and decrease the price.

*** Therefore, determining the daily price of a cooling tower drip depends on several factors, so it is recommended to contact the experts of Dama Gostar Company for a detailed review . The experts of Dama Gostar Company will answer your inquiry online, dear buyer.

air conditioner کنداسور هوایی

Air condenser or air conditioner

Air Condenser or Cool Air Condenser is a type of dry cooling tower (Dry Cooling Tower) which is also referred to in English as Air Cooler and Dry Cooler. An air-cooled condenser is actually a type of water- cooled cooling tower that is commonly used in low-capacity refrigeration units due to its contact with dry air.

Due to the contact of water with the dry air flow of the outside environment, the air condenser reduces the water temperature to near the dry temperature of the environment, and this is the main reason for naming this equipment with the names of dry cooling tower and air conditioner. The fact that the air condenser reduces the temperature of the fluid to the dry temperature of the environment in some cases causes the use of this equipment to be limited in hot seasons. Also, in some climates where the weather in the region is hot and dry due to its proximity to the equator or mountainous conditions, the air condenser efficiency decreases. Observing the basic points in buying a condenser and choosing the best place to install the air conditioner are the most important factors in improving the performance of this device.

Why an air condenser?

In answer to this question, it should be stated that the reason for using air condensers or air conditioner valves is the impossibility of using water condensers in humid and sultry areas. Simply put, in areas where the relative humidity, ambient temperature (relative humidity) is above 80%, the dry environment temperature (Dry Bulb) and the ambient temperature (Wet Bulb) will generally be the same, and the use of water condensers that are not highly dependent on increasing humidity in the environment is practically possible.

In such areas, due to the better performance of air condensers or air conditioners, this equipment is used as the main source of water cooling. The dry or tangible temperature of humid areas is generally lower than that of dry areas due to the high relative humidity of the climate, which adds to the importance of using a dry cooling tower or air condenser.

Main components of air condenser:

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1- Maintenance structure and main frame:

This section includes chassis columns made of studs or cans in different sizes on which the coil and other equipment are placed.

2- Panel sheets and side walls:

This part is riveted and connected after placing the fin coil to form a frame for the passage of air flow on the 4 sides of the air condenser.

3- Finned and non-finned coil for heat energy exchange:

This section consists of a large number of copper pipes enclosed in dense aluminum plates (fin), which is the most important part in heat exchange in the air condenser.

4- Suction fan or impeller:

An air condenser is an air-to-air heat exchanger that reduces the temperature of the fluid or refrigerant inside it and is responsible for creating air flow inside the condenser and on the coil surface of the impeller or fans installed on the device.

5- Remote reduction or power transmission system:

High-capacity cool air condensers generally have large fans, and such fans require less rotational speed, which is why belt, pulley, and gearbox reduction systems are available for this purpose. Coolers are used.

6- Engine or mechanical energy generator:

The energy required to rotate the fan and create negative pressure in the fan is provided by the electric motor, and in fact the most important part of the work entering the condenser is done through this and the power consumption of air condensers is taken from this part.

7- Protective control panel and air condenser control equipment:

In order to regulate the amount of energy consumption and control of electrical equipment (motor), protective and control equipment is used in the control panel.

8. Fan Guard nets:

Networks in the upper or lower part of the fan To prevent foreign objects from entering the fan section, this part is used as a fan guard or butterfly protector.

9-Flange and main collector of inlet and outlet of fluid or refrigerant:

This section is used to connect fluid or refrigerant piping to the condenser, which can be used as a gear head, flange or venturi depending on the type of performance or application.

10-Log lifting or loading hooks on both sides of the device:

This section consists of hooks to facilitate the loading process which is more used in high capacity air condensers.

11-Steam trap:

This part is mostly used in various types of steam condensers, the purpose of this part is to prevent steam from leaving the water outlet.

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How is the capacity of an air condenser calculated?

The capacity of the condenser and cooling tower or dry cooling tower is a function of the amount of heat transfer surface of the condenser and the family of air cooler fans or fans. The more surface energy transfer pipes (coils) are used in the condenser, the more the air cooler or drive cooler will have the capacity to reduce the temperature, and the heat transfer from the water to the outside environment will be better and faster.

Therefore, high-capacity cooling units require a higher level of pipes (larger coil area) and a higher level of ventilation, which in most cases we have to use two or more coil circuits and a large number of impellers in the design of air conditioner or air conditioner. In order to calculate the capacity of the cooling air condenser, the formulas used in the cooling tower section can also be used. In the cooling tower calculation section , you can use the equations necessary to calculate the capacitor capacity.

Which model of fan is more suitable for air cooling systems?

The fan or impeller in air condensers is often of the axial flow type, which is relatively more efficient than the centrifugal or helical centrifugal model impellers. Axial or axial fans used in air condensers may produce a lot of noise if the design principles and standards are not followed. The permissible sound level for axial suction or blower fans or impellers in air condensers is set between 70 and 75 decibels in the design. In order to reduce the noise produced by the air condenser, inverter drive systems are generally used to reduce the fan speed to the nominal and standard speed.

However, apart from the discussion of noise generation, which can be solved by a series of design principles used in the axial impeller, the air conditioner has many advantages over other condensers using the axial aeration system (with axial fan) compared to other condensers. We pay:

Application of control systems in air condenser or air conditioner

The use of variable speed control systems, or VFD control, in addition to reducing the noise generated by the condenser, drastically reduces power consumption in cold and temperate seasons. In fact, in cold seasons, the use of inverter system reduces the flow of air through the cross section of the condenser pipes, which will be compensated by reducing the ambient air temperature, and the effect of this function on the fluid outlet temperature of the cold air condenser is negligible. is.

In special situations where the issue of noise is very important, screw fans can be used to cool the water inside the air condenser. For example, in many units of integrated condenser chillers (single-piece) that are installed near the housing, the condensers have centrifugal screw fans.

Advantages of using an air condenser or dry cooler over an open (wet) cooling tower

• No need to consume water and provide water compensation such as a wet cooling tower
• Freezing of water within the circulating cycle of air-cooled condensers will be much less than evaporative and wet condensers.
• Sedimentation is much less frequent inside the water cycle.
• No need to harden the circulating water due to the closure of the water flow circuit inside the condenser and the coolant
• No need to provide peripheral equipment, including high pressure pumps, water reservoirs and earth dams
• Ability to install outdoors and split the cooling unit to prevent vibration and noise from entering the space
• Lower installation cost than evaporative condensers and wet or open condensers (cooler tower)
• Reduce energy costs in humid and humid areas

Disadvantages of air condenser or air conditioner

• Decreased efficiency due to sunlight
• Increase fluid temperature and decrease efficiency in hot seasons
• Lack of ideal use in hot and dry areas and close to the equator
• Requires control equipment and high cost

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Air condenser price or cooler price

The price of air-cooled condenser will depend on the type of use for refrigerant or water-vapor cooling, the cooling capacity of the condenser (based on the refrigeration tone) or depending on the type of material used in the production of this equipment. Cool air condensers are more expensive than other types of air conditioner valves or air condensers due to their high importance in the category of peripheral equipment. Generally, steam air condensers are produced from all-steel coil equipment, which will increase the cost of this device due to the high price of steel pipes and fittings. Briefly, the main factors affecting the price of air condenser are as follows.

• The type of fluid cooled in the condenser
• Material used in the coil
• Coil type (with or without fan)
• Refrigeration capacity or cooling of air condenser
• Number of fans used in the condenser
• Type of control system and optional ancillary equipment used to control energy consumption
• Other factors such as flow fluid flow conditions, installation conditions, type of chassis material, etc.

سازندگان برج خنک کننده Cooling tower builders

Manufacturers of cooling towers are naturally responsible for the construction and production of cooling towers and the main concern of this class is to improve the quality of cooling towers . To produce and supply with the latest and highest quality. The process of manufacturing and manufacturing industrial cooling products such as cooling towers is not possible except by relying on the knowledge of fluid engineering, chemical engineering and electrical engineering.

The daily advancement of engineering knowledge in the field of cooling and heating installations has caused the manufacturers of cooling towers to seek to upgrade and optimize their products. Manufacturers of cooling towers in order to advance their goals in production and construction today with the participation of academic and engineering knowledge and also with the cooperation of consulting companies such as Sazeh Company are looking for solutions to improve the quality, automation of production and energy efficiency of their products.

The builders of cooling towers around the world have always gathered annually and monthly in different seasons, and with their consensus and mental participation, they have created new and dynamic ideas in the cooling and power production industry. The world's leading manufacturers of cooling towers are Evapco-Marely-CTS-CTI-EBARA-SPX-Paharpour, which are pioneers in the field of science production in the global refrigeration industry. In fact, it depends on the field of activity of the world's reputable companies in the field of construction and production of cooling towers. This equipment is offered in the form of international (international) production and domestic production and production.

Learn more: Cooling tower

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International cooling tower builders

• Marely:

Marley America is a leader in the manufacturing industry of cooling towers and accessories. The company has been operating in the United States since 1970, and today one of its most prestigious products, the two-cell cooling tower, nicknamed the Marley Design, is being designed and manufactured around the world.

• CTI:

The largest manufacturer of cooling towers in the world is CTI Company, which provides global and international standards to other countries and manufacturers of this product in the production and construction of cooling towers. Today, many manufacturers of cooling towers are seeking to obtain a valid production license certificate from CTI in the field of cooling tower, and so far 4 companies in Iran have succeeded in obtaining this license in their products.

• EVAPCO:

Oapco is of American origin and has been operating in the North American continent since 1976. It is now the father of the world's air conditioning industry and is one of the world's leading manufacturers of galvanized cooling towers. Today, OPEC, with more than 56 branches in various countries, is the largest producer and exporter of cooling towers.

• EBARA:

The company is headquartered in Central Asia and has started operations in Japan for the first time. The most famous reason for the reputation of this reputable brand is the production of cooling towers for the production of one of the most common and best examples of cross-flowing cross-flowing coolers called crossovers or Abara cooling towers. This special model of various types of cross-flow coolers with the highest production and manufacturing circulation has been offered in this company.

• LENGTH:

The company is of American nature and manufactures, designs, manufactures and supplies a variety of industrial cooling towers in the oil-rich Gulf states, including Iraq, Saudi Arabia, Kuwait, Egypt and Qatar, which has been in operation since 1995. In 2008 he moved to the United Arab Emirates.

• DELTA COOLING:

The company, like many reputable companies in the field of manufacturing and production of cooling power in the United States, started in 1998, and for the first time, the design of a multi-purpose cooling tower in this company has been conceived.

• CTS:

CTS is one of the most reputable manufacturers in the Middle East. It has been awarded the ISO 9001, ISO 18001 mark and various and valid standards by the American company CTI.

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Manufacturers of cooling towers in Iran

• Temperature range:

Dam Gostar Company has been operating in Mashhad since 2001 and after a short period of time, it has moved to Tehran and today it is considered the founder and innovative idea in the construction of low-consumption hybrid cooling towers. Today, with the aim of improving the quality of its products, the company has 16 cooling and power models for productivity in different climatic regions. Today, all types of cooling devices produced by Dam Gostar Company are supervised by the best quality control team (QC) and are provided to the general public.

• Radiator:

Parto Abgardger Company has started its work with the holy city of Mashhad in the production and construction of circular or conical cooling towers and today it is operating throughout Iran under the name of Tochal Ventilation of Iranians. The company is one of the most reputable and oldest manufacturers and manufacturers of cooling towers.

• Ariabnez:

Aria Beniz Company is one of the most reputable and largest manufacturers of cooling towers in Iran, which uses the knowledge of engineering to boldly be one of the top design teams for cooling and power. Ariabnews is also currently exporting to foreign countries.

• Moonlight:

Mahtab Gostar Company is one of the most reputable engineering companies in the field of air conditioning systems, especially the production and construction of cooling towers, which has 6 reputable and active branches throughout Iran to provide after-sales services.

• Is non-existent:

Nab Zist Co. is one of the top manufacturers of cooling towers in Greater Tehran and throughout Iran, and today, by producing multi-cell cooling towers, it promotes and controls the energy consumption of the cooling tower.

The main concerns of the interior builders of the cooling tower

• Preparation of quality raw materials for proper and standard production of products
• Lack of proper and standard equipment in the production line of parts and accessories for cooling tower
• Customer dissatisfaction due to the existence of many intermediaries in the sales market
• Lack of economic justification for after-sales service
• The counterfeiting and poor quality of the parts and materials used in the manufacturing process, which reduces the final quality of the product.
• Manpower inefficiency in the production sector and non-compensation of this issue by automating production due to lack of parts production equipment (due to economic sanctions)
• Design and production of cooling towers by non-specialist builders, which has led to a loss of confidence in national production and dissatisfaction of other industrial classes with the support of domestic manufacturers.
• Reducing the cost of some manufacturers and builders of cooling towers and increasing customer dissatisfaction after purchasing a cooling tower creates the attitude of reducing the cost by reducing the quality of materials by other manufacturers.

Construction and production of cooling towers

The process of building or building a cooling tower includes various parts of different parts of the construction of parts and assembling them in the cooling tower. In other words, the process of production and construction of the cooling tower is divided into three main parts. The first part involves the production of cooling tower components and the second part is related to the assembly operation, and the final part is the technical and engineering supervision (quality control).

The process of building a cooling tower must be done with great care, as this results in valuing and valuing the final quality of the equipment produced. The cooling tower has various equipments related to water supply and water supply parts and has different parts that are produced from metal, polymer or fiberglass FRP material. Most manufacturers today are trying to limit the use of metal materials in the production of interior parts of cooling towers and use high-strength materials such as fiberglass or polypropylene instead.

Due to the above, the manufacturers of cooling towers in the production and construction of cooling towers may deal with different parts of production. In fact, building a cooling tower requires technical knowledge in the field of fluid, chemical, electrical, civil and materials engineering. Electric motor is one of the parts related to electrical engineering. Therefore, a successful manufacturer in the construction of cooling towers must have a complete and experienced team of engineers in various fields.

The general steps of building a cooling tower by domestic builders

1- Manufacture of parts and accessories used in different parts such as impeller, nozzle, packing, drip trap and body components

2- Assembly and assembly of parts and equipment on the main body and frame

3- Quality control and technical supervision of the produced product in accordance with various standards and tests, including dewatering test, welding test and pressure test.

Various parts for making cooling tower parts (before assembly)

• Injection of plastic and polymer parts such as nozzle or spray nozzle, drip trap and packing media
• Shaving of metal parts from steel and aluminum materials such as round reduction (Foley) and Sprinkler (water turbine)
• Production of body parts from FRP fiberglass material with fibers and resin and using molding and manual or machine baking method
• Coil chassis welding, drip and pack holder support, fan guard or butterfly guard and butterfly and motor holder chassis at the top of the fan neck
• Construction and production of butterfly blades or cooling tower fans using extruder or hydraulic press and assembling that part is machined with the hub part and then going through the steps of static and dynamic balance of the impeller.

Cooling tower assembly

The process of assembling or finalizing a product involves placing different parts in the intended parts. In fact, the next step in supplying and producing the side components of a cooling tower is the assembly or heading of the cooling tower. This step can be done in two ways according to the necessary qualifications for transportation and installation.

• Assembly at the project site (cooling tower installation site)
• Assembly in the factory or workshop for the manufacture and production of cooling towers

Depending on the capacity and dimensions of the cooling tower, the process of assembling or building a cooling tower can be done in both cases. Generally, capacities of more than 500 tons of refrigeration in the cooling tower are assembled at the project site. Sometimes for various reasons, many manufacturers try to assemble all their products in the form of assembly and delivery to the factory door. Due to this purpose, capacities above 500 tons of refrigeration, which will be very difficult to transport and load, will be designed and produced in multi-cell.

Reasons why construction companies refuse to assemble and build cooling towers at the project site

• Lack of quality control of the technical supervision team correctly and efficiently due to the possible length of the distance
• Decreased product quality due to fatigue due to distance and assembly time on executive and assembly personnel
• Increase production time, construction, installation of cooling towers
• Increase in transportation costs, food, accommodation and staff assembly operations

Partial steps to build a cooling tower

• 1- The stage of production and payment of initial molds of fiberglass body parts
• 2- The process of molding and making fiberglass parts of the cooling tower from the mother mold
• 3- The cooking stage of fiberglass parts in front of the sun or furnace baths
• 4- Fiberglass body parts payment step with milling and polishing machine in order to polish and eliminate appearance defects in manufactured parts.
• 5- Granule material injection stage in plastic injection machines for making and producing plastic parts such as nozzles, drip trays and cooling tower packing
• 6- Shaving metal parts such as round reduction system, sprinkler, inlet and outlet flanches and hubs and impeller and fan handles
• 7- Extrusion of fan blades with fiberglass or aluminum material with airfoam cross section (Airfoil)
• 8- Cutting and welding of parts for fan, motor and power transmission system and internal parts support systems.
• 9- Glazing of metal parts such as coil support (in CCTV cooling towers), drip support, packing, pipe and nozzle
• 10. Assembly and assembly and final construction of the main body of the cooling tower consisting of fan deck, beacon (panel), panel, column and louvers
• 11- Placement and installation of side parts made in the cooling tower
• 12- Installing and tightening the belts of the power transmission section
• 13- Sealing fiberglass seams in different parts of the body and water inlet and outlet flanches
• 14- Drainage test, welding test (for coil), pressure test (for water and coil inlet pipes)
• 15. Final monitoring of the technical supervisor of Demgostar Company and elimination of possible defects caused by human errors in the production and construction of cooling towers.