Aspen Pad Cooler

How an Aspen Pad Evaporative Cooler Works

Aspen pad evaporative coolers cool the warm ambient air using the process of evaporative cooling. These devices draw in warm air and pass it through the aspen pads, causing water to evaporate and lowering the air temperature. For this reason, the larger the cooler’s dimensions and the greater its circulating water volume, the higher its cooling capacity.

Evaporative cooling occurs in two types: direct and indirect. In the direct method, the cooled air enters the space with an increase in humidity, but in the indirect method, this increase in humidity does not occur.

An aspen pad evaporative cooler typically uses the direct evaporative method, which is why it is not suitable for regions with humidity above 40%. In this process, water is first pumped from the basin to the trough at the top of the cooler and then flows onto the pads. After the pads are moistened, the cooler’s fan passes the ambient air over them and sends the cooled air through ducts into the building’s interior.

Types of Evaporative Coolers

Just like other types of home coolers, aspen pad evaporative coolers are produced in various types, each designed for specific applications. Choosing the most suitable cooler for different environmental conditions and needs requires knowledge and consultation. Below, we’ll discuss two common types of aspen pad evaporative coolers.

Portable Evaporative Cooler

These coolers are suitable for small spaces due to their easy portability. Their reservoirs are filled manually or with a temporary connection to a water source at short intervals, making them highly effective for temporary or confined spaces.

Fixed Evaporative Cooler

This type of cooler is typically installed on rooftops or in outdoor building spaces. It has larger dimensions and is connected to a permanent water supply. Fixed coolers require ducting and can be used with either aspen pads or cellulose pads.

Advantages and Disadvantages of Evaporative Coolers

Aspen pad evaporative coolers are among the most popular and economical air-cooling devices. In many Iranian cities, with the exception of humid regions, aspen pad evaporative coolers are preferred over air conditioners and split systems, especially in residential and commercial buildings.

Advantages:

• Easy maintenance and repair
• Very low installation, setup, and repair costs
• Low electricity consumption
• High cooling efficiency

Disadvantages of Using Aspen Pad Evaporative Coolers:

• Relatively high water consumption due to the growing water scarcity crisis in the country. For optimal consumption, it’s better to use a cellulose evaporative cooler, which is classified as a low-energy evaporative cooler.
• Inability to select an ideal temperature and the forced choice between only two modes: high speed and low speed.
• The pads of evaporative coolers are full of dust and fungi. Since they are moist and do not get direct sunlight, these factors find their way into the house with the airflow. This issue is more severe in polluted cities like Tehran, which have a high concentration of airborne particles.
• Using regular water to cool the environment brings disadvantages such as a limited amount of cooling, clogging of the pads, potential clogging of the pump, and rust formation.
• There is a possibility of water leaking onto the cooler’s motor or water pump, which has repeatedly caused the cooler’s pump and motor to burn out.

Maintenance and Descaling Solutions for Aspen Pad Evaporative Coolers

A common problem in evaporative coolers is the formation of scale in the water basin and on the body of the unit. If left unaddressed, this can lead to the failure of various parts, including the pump, float, and motor. Therefore, descaling the cooler during annual servicing is of particular importance. Below, we’ll review the main solutions for reducing scale:

• Install an Evaporative Cooler Descaler: Descalers are designed with a special formula that, when placed in the water basin, prevents scale from forming on the body and pads.
• Use Bleach or Hydrochloric Acid: You can use bleach to clean the scale periodically. When using this method, be sure to wear gloves, as these substances are harmful to the skin.
• Vinegar Solution: Although the smell of vinegar might be unpleasant for some, it is a simple, homemade method for descaling, especially if the aspen pad evaporative cooler has not yet accumulated a lot of scale.
• Regularly Change the Cooler’s Water: Draining and replacing the water in the basin monthly is a simple but effective way to prevent the buildup of scale.

Installation and Service

It’s best for the installation of an aspen pad evaporative cooler to be carried out by experienced technicians, but its annual service is a necessity that increases the device’s efficiency and lifespan. Some key points for cooler service include lubricating the pump, replacing the pads, lubricating the bearings, providing a sunshade, thoroughly cleaning the cooler, and adjusting the float. Since evaporative coolers are electric, precision is mandatory in every service step, and you can seek help from expert technicians if needed.

You should replace the cooler’s pads at least once a year. This is because the pads’ material and structure absorb environmental pollutants, and due to water remaining on the pads, there is also a possibility of scale formation. If you do not replace the pads during the service of the aspen pad evaporative cooler, the device’s cooling power will not only decrease further, but the risk of transmitting diseases to residents also increases.

Factors Affecting the Capacity of Aspen Pad Evaporative Coolers

Choosing an aspen pad evaporative cooler without considering the building’s area and other influential factors can be a poor choice. Selecting a cooler with a capacity that is either too low or too high can cause many problems for the device, increasing the need for repairs.

For example, if you use a cooler with a capacity lower than your home’s needs, the device will have to run for more hours to cool the environment, which increases its electricity consumption. On the other hand, the device’s efficiency decreases, and more pressure is put on its internal components, including the motor.

If the aspen pad evaporative cooler’s capacity is more than the building needs, the indoor environment will become excessively cold, and the home’s electricity consumption will increase. However, keep in mind that other factors besides the building’s area also influence the cooler’s capacity. These include the number of cooler vents and the building’s ducting layout; the more ducts and vents an aspen pad evaporative cooler has, the higher the capacity device you’ll need. You should also pay attention to the region’s air temperature and adjust the cooler’s capacity based on the average temperature. The final point is to install the evaporative cooler in a location that is less exposed to direct sunlight.

Frequently Asked Questions about Aspen Pad Evaporative Coolers

 1. What is an aspen pad evaporative cooler and how does it work?

An aspen pad evaporative cooler is one of the main pieces of equipment for providing cool air in hot and dry regions. In addition to cooling the air, it also performs ventilation well. These coolers use the direct evaporative cooling process—producing cool air by evaporating water—to convert the hot summer air into a more pleasant atmosphere. The process works by pumping water from the basin to the trough at the top of the cooler and then letting it flow over the pads. After the pads are moistened, the cooler’s fan passes the warm ambient air over them and sends the cooled air through ducts into the building’s interior.

2. What are the advantages and disadvantages of using an aspen pad evaporative cooler?

Advantages:

• Easy maintenance with very low installation, setup, and repair costs.
• Low electricity consumption.
• High cooling efficiency.
• They are a popular and economical choice in many Iranian cities (except for humid regions).

Disadvantages:

• Relatively high water consumption, which is a challenge given the growing water scarcity crisis.
• Inability to select a precise temperature, with the cooler limited to only two modes: high speed and low speed.
• The pads are prone to collecting dust, fungi, and airborne particles, which can then be carried into the home by the airflow, especially in polluted cities. A significant portion of this issue is resolved in cellulose evaporative coolers.
• Using regular water can lead to disadvantages like a limited cooling effect, clogging of pads and the pump, and rust formation.
• There is a risk of water leaking onto the motor or pump, which has repeatedly caused them to burn out.

3. What types of evaporative coolers are available on the market?

Aspen pad evaporative coolers are produced in various types, each designed for specific applications. The two most common types are:

• Portable Evaporative Cooler: These coolers are easily movable and are suitable for small spaces. Their reservoirs are filled manually or with a temporary connection to a water source at short intervals, making them highly effective for temporary or limited spaces.
• Fixed Evaporative Cooler: This type of cooler is typically installed on rooftops or in outdoor building spaces. They have larger dimensions and are connected to a permanent water supply. Fixed coolers require ducting and can be used with either aspen pads or cellulose pads.

4. How can you prevent scale buildup in an aspen pad evaporative cooler?

To reduce and prevent scale buildup in the cooler’s basin and body, which can lead to the failure of parts like the pump, float, and motor if left untreated, the following solutions are recommended:

• Install an Evaporative Cooler Descaler: Descalers have a special formula that prevents scale from forming when placed in the water basin.
• Use Bleach or Hydrochloric Acid: You can use these substances periodically to clean scale, but be sure to follow safety precautions, such as wearing gloves.
• Vinegar Solution: This is a simple, homemade method for descaling, especially if the cooler has not yet accumulated much scale, though the smell can be unpleasant for some.
• Regularly Change the Cooler’s Water: Draining and replacing the water in the basin monthly is a simple but effective way to prevent scale buildup.

5. What are the important tips for installation and service?

Installation of an aspen pad evaporative cooler is best performed by experienced technicians. Annual servicing is also a necessity that helps increase the device’s efficiency and lifespan. Some key service tips include:

• Lubricating the pump and bearings.
• Replacing the pads (at least once a year, as they absorb pollutants and are prone to scale formation).
• Providing a sunshade for the cooler.
• Thoroughly cleaning the cooler.
• Adjusting the float.

Given that these are electric coolers, precision is mandatory in every service step, and you can seek help from expert technicians if needed.

6. What factors influence the required capacity of an aspen pad evaporative cooler?

Choosing the right capacity without considering the building’s area and other factors can lead to problems. Using a cooler with a lower capacity than needed will cause it to run for longer periods, increasing electricity consumption and putting more stress on the components. Conversely, choosing a capacity that is too high will make the environment excessively cold and also increase electricity usage. Factors that influence capacity include:

• Building Area: A larger area requires a higher-capacity cooler.
• Number of Vents and Ducting Layout: More ducts and vents require a higher-capacity cooler.
• Regional Air Temperature: The cooler’s capacity should be adjusted based on the average temperature of the area.
• Cooler Location: It’s best to install the cooler in a spot that is less exposed to direct sunlight.

7. For which regions are aspen pad evaporative coolers not suitable?

Aspen pad evaporative coolers typically use the direct evaporative cooling method, which increases air humidity. For this reason, they are not suitable for regions with humidity above 40%, as they may not be efficient and can even create an uncomfortable, stuffy feeling. In these conditions, cellulose evaporative coolers or air conditioning systems are more appropriate options.

8. What services does Dadman Tahvieh provide for aspen pad evaporative coolers?

Dadman Tahvieh specializes in providing cooling and heating systems, including aspen pad evaporative coolers. Relying on their technical expertise and knowledge of quality raw materials, the company also manufactures related components. Dadman Tahvieh offers aspen pad evaporative cooler models 3500, 5500, and 7500 with energy ratings of A and E. The company, with its experienced and committed staff, is dedicated to customer respect and satisfaction and provides services including sales, after-sales support, and technical assistance.