Air Washer

Air washers are cooling and heating appliances applicable in various spaces. They effectively remove dust, pollen, and other pollutants. We offer a consultation service to help you choose and buy the most suitable air washer for your needs, whether for individual purchase or bulk orders.

A Technical Guide to the Selection, Purchase, and Pricing of Air Washer

An air washer is a device that sprays water vapors in the air to freshen up, humidifyBefore purchasing any HVAC system, you should determine your desired system according to the intended space dimensions, budget, needs, etc., so you’ll need a technical guide for the best selection. An air washer is a device that sprays water vapors in the air to freshen up, humidify, and sometimes cool the air. Air washers can be used as an independent device or as part of another air conditioning unit.

There are two main types of air washers, apartment and industrial, which are offered in horizontal, vertical, front spray, and face-up models, equipped with or without a heating coil. They can be used in most cities of Iran and the Middle East that have dry weather in summer (relative air humidity is less than 40% to 45%).

Air Washer Applications

Air washers are usable in apartments, offices, and especially industrial environments and factories in cities of Tehran, Isfahan, Semnan, Shiraz, Mashhad, Kermanshah, Sanandaj, Hamedan, Arak, Tabriz, Karaj, Qazvin, Sulaymaniyah, Erbil, Mosul, Kirkuk, Aleppo, Ankara, Mazar-e-Sharif, Kabul, etc. that do not have humid and muggy weather in summer, to provide cool air in summers.
They can also be used as a heat generator by installing a suitable hot water coil to use the pleasant heat in the cold seasons of the year.

Air Washers Types

Air washers can be categorized into different types in terms of power and efficiency, way of use, and installation location:

1. Airwasher classification in terms of power and efficiency: In general, air washers are divided into three main classes, which are class 4, class 6, and class 8 air washers.
2. Types of air washers according to their usage: To classify air washers according to their use, they can be divided into two groups: industrial air washers and household air washers.
3. Airwasher types in terms of installation location: Based on the installation placement, air washers include standing, under-ceiling, and rooftop air washers, which must be selected based on expert advice and tailored to each project.

Types of Air Washers in Terms of Power and Efficiency

In general, air washers are divided into three classes, which are as follows:

• Air Washer Class 4: Class 4 air washers have a row of nozzles with a flow rate of 4 GPM per 1000 cfm of passing air
• Air Washer Class 6: In these air washers, the flow rate of water per 1000 cfm of passing air is 6 GPM
• Air Washer Class 8: These air washers also have more nozzles with a flow rate of 8 GPM per 1000 cfm of passing air

Types of Air Washers in Terms of Usage

There are two types of air washers based on their usage: industrial and domestic:

Industrial Air Washer

Industrial air washers clean the air from pollution and dust with proper filtration. They transfer pleasant and clean air to the units, spending the least cost and electrical energy.

In industrial, commercial, and office environments, due to the wider space or high ceilings, a larger volume of the returned air from the building enters the air washer again and mixes with the fresh incoming air.
Therefore, in commercial areas, industrial air washers with larger dimensions and power are used. Some industrial air washer applications are in industrial sheds, greenhouses, exhibitions, warehouses, universities, department stores, sports halls, etc.

Domestic or Home Air Washer

The mechanism and operation of home air washer devices are similar to industrial models. The only different factor is the domestic and commercial airwashers dimensions. Home air washers are smaller than industrial models, called apartment or home air washers. These devices are produced in horizontal, vertical, and front-blowing models.

All household air washers can be installed in different places, such as balconies or terraces, roofs, and patios in residential buildings, and connected to each unit through ducting due to their small space occupation.

It should be noted that home air washers provide independent air conditioning of each unit, and by connecting them to the engine room hot water coil or wall package, in addition to the cooling function, they can be used for heating in the cold months of the year.

Of course, air washers need to implement the internal air return channel and use the return air from the indoor environment to provide warm air in the cold months of the year (unlike their summer performance, which must be with 100% fresh air). Because otherwise, their hot water coil should be calculated and implemented many times stronger so that it can fully warm and direct one hundred percent of the cold air in the environment in the winter season.

Types of Air Washers in Terms of Application

In terms of application, there are three main types of air washers:

Standing Air Washer

As its name suggests, the standing air washer is installed in a standing position. This device can be installed in most places, but usually, it is placed on the roof or inside the balcony of the building, and cool air in summer and warm air in winter (with return air duct from inside) is transferred to the units through ducting. They do. Standing air washers are offered in face-up or overhead models with or without heating coils.

Ceiling Air Washer

Ceiling or under-ceiling air washers are usually installed in the balcony ceiling or inside the false ceiling of the building. Like other kinds of air washers, they require air ducting to direct and transfer fresh and clean air to the units of all residential, office buildings, etc.

Rooftop Air Washer

The rooftop air washer is a type of standing air washer installed vertically on the roof, and its function is the same as other air washers, using ducting of outgoing air in summer and return and outgoing air in winter.

Econopack Air Washer

Whenever it is impossible to access hot water to provide heating by air washers, Econopack air washers are the best. An Econopack Air washer is a device that performs like a hot air furnace to provide heating.
In this way, a gas or diesel burner is installed in the device, the resulting flame heats the furnace, and finally, the exhaust air is heated by passing through the combustion chamber of the air washer. There is no need for a spa engine room to heat the spa coil and the exhaust air. It is not an air washer.

How Do Air Washers Work?

An air washer or air cooler can provide cool, fresh air in summer. Moreover, if a heating coil is placed in the airflow path and the air return channel is implemented from the inside, providing warm air in winter will be possible.
On the other hand, due to the presence of an air filter in the airflow path of the air washer, a large part of the dust, pollution, and allergenic substances in the air are easily removed and absorbed.

Therefore, the cool or warm air blown by the air washer is clean and pure. Also, since the water inside the air washer is heated to a great extent and turns into steam, this steam is combined with cool or warm air inside the machine, and its relative humidity increases. For this reason, the air washer is a suitable option only for use in areas with dry and semi-arid climates.

How Air Washer Components Work

In the following, the cooling and heating operation of the air washer is described component by component:

Air Washer Cooling Performance

In summer, the hot air from the outside is sucked into the device by the air washer fan, and by passing through the air filter installed in the device, the filter absorbs a significant part of the dust in the air. Then, this air volume enters the main chamber of the air washer for cooling.

Reducing the air temperature in the main chamber of the air washer is done by spraying water powder by nozzles or sprinklers and by evaporative cooling. At this stage, in addition to reducing the air temperature, the remaining dust particles and other pollutants in the air are removed from the air by coming in contact with the water powder particles sprayed from the nozzles, and finally, cool and clean air comes out from the air washer.

Air Washer Heating Function

In winter, air washers provide warm air in the building by passing the return channel air from inside (along with a percentage of fresh outside air) over the hot water coil built into the device (which is heated by the central engine room boiler or heating package).

In this way, the air inside the air washer device is blown on the surface of the coil containing hot water, and its temperature increases. Meanwhile, the temperature of the hot water in the coil is reduced, and it is returned to the heating package or the hot water boiler of the engine room through the return pipe. Then this hot air enters the ducting by the fan and is blown to the units from there. This cycle, or cycle, flows continuously inside the air washer.

Note that the heating function of the air washer can be implemented in two ways: combined and fully fresh. The full-carpet mode means that all the air required by the device is supplied from the fresh air of the outside environment, But in the combined mode, part of the air required by the device is supplied from the air inside the unit (through the air return channel) and the rest from the outside air.

How to Determine Air Washer Capacity?

Some of the purchase orders for air washers are apartment air washers with a capacity of up to 7,000 CFM (equivalent to 11,900 M3/hr) and for use in other cases mentioned above, air washers in classes 4, 6, and 8 with capacities of 7,000 to 100,000 CFM (equivalent to 170,000 M3/hr) is welcomed by experts and engineers of projects in the above climatic conditions.

Since the cooling function of air washers is based on the evaporation process of water (like water coolers) and only by supplying 100% fresh air from the outside environment, therefore, air washers should not be expected to produce dry cooling like condensation or absorption cooling systems or split ducts and splits.

Recently, some air washer manufacturers, to reduce the temperature of the water and consequently reduce the temperature of the cold air coming out of the air washer, based on the customer's order, calculated and installed an additional compression refrigeration system to reduce the temperature of the spray water entering the main chamber of the air washer, which with this method practically they create a combination of condensation and evaporative cooling system, and as a result, while improving the cooling of the air washer, the amount of moisture added to the air coming out of the device is also reduced.

The Principal Parts of an Air Washer

Air washers are placed independently or in interaction with the rest of the building's air conditioning system and include:

• The Body: usually made of galvanized sheet with electrostatic paint coating.
• The Electric motor: The electric motor and fan which is selected according to the capacity and volume of aeration, as well as the static pressure required to pass air from the channels to the air exit valves in the rooms.
• Air purification filters: including all kinds of bag filters, washable aluminum filters, and in hygienic air washers, HEPA, carbon, etc., filters are used.
• Water pump and nozzles: they are responsible for spraying high-pressure water and powder in the air washer machine.
• Air distribution dampers: usually installed with manual and automatic control types and are responsible for distributing air completely uniformly in the air distribution channels.
• Hot water coil: in the winter season, it is responsible for heating the exhaust air of the air washer.
  
  

Air Washer Advantages

Air washers may have countless benefits and advantages compared to other ACs, but most of them are those we have listed here:

1. Optimum power consumption, therefore, lower costs (electricity in summer and gas in winter) compared to compression systems with compressors.
2. Optimized water consumption compared to evaporative coolers.
3. Providing the moisture needed by the building and residents in the dry heat of summer.
4. Air washers' maintenance and spare part costs are much lower than systems such as ducted/ductless split air conditioners and chillers.
5. Due to the capability of heating and cooling (all-in-one AC), multiple room devices' operational problems and maintenance costs (heaters and fan coils) are eliminated.
6. Removing heating water risers and pipes from the floor, thus reducing the problems of thick flooring and reducing the dead loads of the building.
7. Using the dead space above the false ceiling to distribute air through ventilation channels. 
8. The possibility of installing the air washer centrally in remote areas of the building and ease of access for repairs and maintenance.
9.  The ability to control heat and humidity and use fresh air outside in summer and winter.
10.  Use of single-phase electricity, especially in apartment systems: most compression systems (such as ducted/ductless split ACs) with a capacity of 36,000 BTU and above use three-phase electricity. For example, using a ductless or ducted AC requires three-phase electricity for an apartment of about 100 square meters and above. In the case of using an air washer, there is no need for three-phase electricity even for 300 square meter apartments.
11. Appropriate and reasonable initial cost, especially in large spaces, as the size and volume of the building space increase, the difference in the initial price and the difference in electricity and energy costs between the air washer and condensation systems increase. For example, cooling and heating large spaces such as mosques, halls, factories, and sheds using compression systems (such as central heating boiler units, chillers, mini chillers, etc.) is very expensive. It should also be noted that the initial cost of buying and installing these devices is high, but air washers can be used at the cost of even one-tenth of these systems.
12.  Air washers can heat up or cool down the place very quickly, which means they are suitable for places where their use is inconsistent (schools, mosques, etc.). Also, in residential buildings, there is no need for the system to be permanently on when residents are not present, which reduces energy consumption. Moreover, due to the powerful blower of air washers, heat, and cold are distributed homogeneously and uniformly in the building.  
13. The high-pressure spraying of water molecules in the air washer device and the passage of air through them causes a significant amount of dust and other pollutants in the incoming air to be absorbed and clean air to be transferred to the indoor environment.
    
    

Disadvantages of Air Washers

Just like everything else, air washers come with a few disadvantages. Some of them are as follows:

• The air washer's cooling function does not have the quality of ductless split units, ducted ACs, or chillers. The cooling efficiency of the device decreases, particularly during very hot hours of the day or on very hot days in tropical cities such as Qom.
• For uses with a lot of heat generation (such as cooking areas, densely populated areas, and anywhere there is water vapor), the cooling of the air washers must be increased to the necessary quality.
• Water creates its own set of issues, particularly in the maintenance of devices.
• These devices will not provide adequate cooling in humid areas (such as the north and south of Iran like the weather of Ahvaz, Bushehr, Bandar Abbas, Basra, Baghdad, Karachi, Damascus, Najaf, Karbala, Dubai, Abu Dhabi, Kuwait, Riyadh, etc.).
• In humid and humid areas (such as north and south of Iran) with air humidity above 45%, air washers cannot be expected to provide adequate cooling in the summer season.
• The necessity of calculating and implementing the air return channel in order to save the heat required by the air washer spa coil in the winter season. If the air washer is installed outside the space or the false ceiling of the relevant unit or on the roof of the project, more than 80% of the air entering the device should not be supplied from the cold air outside the building in the winter season; Because if the air inside the building is not returned to the air washer, the consumption and waste of energy in the air washer will increase a lot.

Other Technical Terms of Air Washers

Here are the four most important technical terms we think you should know about:

1. Dehumidification of Air Washers

Dehumidification in the air washers is possible when the temperature of the sprayed water is lower than that of the incoming humid air. The colder the sprayed water is, the more dehumidifying is done, and the cooler and fresher the air becomes.

2. Corrosion Control of Air Washers

Corrosion control is crucial in any metal system that works with water. Carbon dioxide, sulfur dioxide, and other corrosive gases can cause serious problems when dissolved in water. All of these materials form a mild and dilute acid that easily attacks unprotected surfaces and causes corrosion, and one of its characteristics is a pressure drop in the nozzle.
To correct this situation, they create an anti-corrosion coating on the metal surface, which, in this case, increases the pH of the water to about 9. This pH neutralizes surface acids and delays the growth of bacteria in the air washer system.

3. Oil Vapors Control in Air Washers

The oils present in the air vapor are created from the operation of machinery at high speeds. Oil particles cause a malfunction in the system, and oil separators can solve this problem. These materials take the oil from the mud and dirt of the water, bring it to the water's surface, and take it out of the system with an overflow. If oil remains in the system, the system reaches a point where it is forced to shut down.

4. Odor Control in Air Washers

The air washer gives air to the area that people breathe, so the air must be clean and free of odor and pollution. Air washers quickly become slimy and smelly. To solve this problem, they use low-smelling oxidizers such as hydrogen peroxide and bromine, which are injected into the air washer system twice weekly.

Extra: Evaporation systems such as Air washers and Zent units are great for hot and dry areas. These systems are more affordable than compression refrigeration systems (ductless or ducted ACs and chillers), especially for large buildings with high ceilings, such as halls, mosques, sheds, loft houses, etc. The cost of electricity consumed by these devices is less than a quarter of ducted/ductless split air conditioners and chillers.

How to Choose the Most Suitable Air Washer?

There are, of course, many factors to consider when choosing an air washer; some are personal preferences, and some are technical requirements. But the following are the most important factors you do not want to miss:

1. Aeration volume (m3/h - CFM).
2. Installation experts should define the required aeration volume, motor power, and static pressure.
3. Forward or upward ventilation of the device.
4. Placing the required air washer horizontally or vertically based on the project.
5. Having or not having a heating coil and determining its capacity and thermal level.
6. Installation location, conditions, and how to install the air washer in the building.
7. Accurate calculations and basic implementation of the air distribution ducted system of air washers according to engineering calculations and based on the volume and speed of passing air at each section of the channel using a duct worker and according to the standards of changing the angle and radius of the internal arc in the ducts.

Note: Refer to the explanations of the air ducts and vents in the air conditioning equipment section of the DamaTajhiz website.

Air Washer Buying Guide

The first step to buying an air washer should be to pay attention to the cooling capacity and the dimensions of the installation location.

Air washers are produced and supplied in different types with different cooling and ventilation capacities. Therefore, to choose the right aeration capacity, model, and price of the air washer you need to buy one, consider your desired space’s dimensions and residential status.
After that, things like energy consumption, features, brand, and benefits of the relevant air washer should be examined.

On the DamaTajhiz HVAC website, technical information of dozens of models of air washers from different reliable brands with original warranties has been presented for you to enjoy the good feeling of optimal and smart shopping for wholesale purchase.

Air Washer Price

The price of air washers can vary greatly based on the type of capacity and brand. All the air washers presented on DamaTajhiz HVAC Group's website have product IDs, reasonable prices, and discounts, which are already included.

Also note that in the specialized HVAC group of Damatajhiz, all the DamaTajhiz air washers are only sold in bulk. Therefore, if you want to wholesale any of these products, contact us.

Location of Air Washer Installation

Selecting an appropriate location for installing the air washer, whether for residential or industrial units, is a critical issue that must meet certain requirements. Before installing an air washer, the following important yet simple points should be considered:

• The installation location of the air washer should allow for 100% fresh air intake from the outside during the summer and recirculated indoor air during the winter. To achieve this, it is recommended to install the air washer near an openable window, which should be fully open in summer and closed in winter.
• Installing a drainage system with a minimum diameter of 3 inches at the installation site is essential, especially for industrial air washers in factories, workshops, and large warehouses.
• The installation location of the air washer should be selected in an area that allows for easy access around the unit for maintenance and repair.

Air Washer FAQs

Q: How many degrees can the air washer reduce the air temperature?

A: Usually, if the capacity of the air washer is chosen correctly and there is no problem in terms of dimensions (according to Dactilator), the implementation of ducting, compliance with the radius of the inner arc of the channel, or the standards of changing the direction in the channels, it can reduce the indoor air temperature to several around 26 degrees Celsius.

Q: Is the air washer the same as the water cooler?

A: No, but the type of cool air supply is similar to the water cooler, using the evaporative cooling method, with the difference that the air washer has a more effective and stronger performance than the water cooler.

Q: How much electricity does the air washer machine consume?

A: The electricity consumption of air washers is generally about 1/5 (one-fifth) of the electricity consumption of condensation refrigeration systems in the desired environment.

Q: Is it possible to adjust the humidity in the air washer system to the desired level?

A: Yes, you can adjust the humidity level of the device as desired by choosing the class of the air washer (class 4, 6, or 8) and then installing the humidistat and steering the device's water pump.

Q: In what places is the air washer suitable for use?

A: Airwasher is suitable for use in apartments, residential, offices, healthcare, schools, halls with high ceilings, workshops, exhibitions, etc., whose relative humidity is less than 40% in summer.

Q: Does the air washer need a chiller?

A: No. If you use an air washer, you have chosen the type of evaporative cooling, and you no longer have to deal with the chiller's compression cooling system.

Q: What type of weather is not suitable for using an air washer?

A: As mentioned earlier, using air washers is not suitable for cooling environments where the air has a relative humidity of more than 45% in summer (such as coastal cities).

Q: Can an air washer be used instead of an air conditioner?

A: If you don't have a compression chiller, you won't need an air conditioner Because the air conditioner works completely like an air washer in terms of heating function (using a hot water coil in the air passage of the device). But the air washer cools the summer air with humidification without needing a chiller, while the air conditioner supplies the summer air by passing through the cold water coil of the chiller (cooling coil).

Dear user

• Suppose you still have more questions about purchasing an apartment industrial Air Washer after reading the above information. In that case, you can contact DamaTajhiz HVAC Group by dialing these numbers: 108-117-119-120-126- 317 and get advice from the air conditioning equipment sales experts.
  
  
• Also, because Damatajhiz specialized group, as an official member of the Union of Heating and Air Conditioning Equipment Sellers, provides all kinds of air washers in the Middle East region, if you need an Air Washer for any of the countries in the region, you can place your purchase order with confidence and guarantee. Leave the right product and price to our sales experts.
  
  

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