Any excess water that drips out from the bottom of the membrane is collected in a pan and recirculated to the top. Single-stage direct evaporative coolers are typically small in size as they only consist of the membrane, water pump, and centrifugal fan. The mineral content of the municipal water supply will cause scaling on the membrane, which will lead to clogging over the life of the membrane.

In extremely dry climates, evaporative cooling of air has the added benefit of conditioning the air with more moisture for the comfort of building occupants. Evaporative coolers lower the temperature of air using the principle of evaporative cooling, unlike typical air conditioning systems which use vapor-compression refrigeration or absorption refrigeration. Evaporative cooling is the conversion of liquid water into vapor using the thermal energy in the air, resulting in a lower air temperature. This conversion of sensible heat to latent heat is known as an isenthalpic process because it occurs at a constant enthalpy value. Evaporative cooling therefore causes a drop in the temperature of air proportional to the sensible heat drop and an increase in humidity proportional to the latent heat gain. Evaporative cooling can be visualized using a psychrometric chart by finding the initial air condition and moving along a line of constant enthalpy toward a state of higher humidity.

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It is powered by a solar panel array which also serves as secondary power in case of main power loss. Evaporative cooling is a common form of cooling buildings for thermal comfort since it is relatively cheap and requires less energy than other forms of cooling. Another application of a phase change to cooling is the “self-refrigerating” beverage can. A separate compartment inside the can contains a desiccant and a liquid.

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Because of this, evaporative coolers use only a fraction of the energy of vapor-compression or absorption air conditioning systems. Unfortunately, except in very dry climates, the single-stage cooler can increase relative humidity to a level that makes occupants uncomfortable. Evaporative cooling is especially well suited for climates where the air is hot and humidity is low. In the United States, the western and mountain states are good locations, with evaporative coolers prevalent in cities like Albuquerque, Denver, El Paso, Fresno, Salt Lake City, and Tucson.

The result is a constant flow of fresh, moisturized, cool air while stale air is circulated out of the room through an open window or door. 冷風機香港 are rated according to the amount of air-flow that they can generate. This is why they are actually grouped according to air flow per minute. The total quantity of air that a cooler unit can pump per unit time can be measured in either CFM , CMM , or CMH . The key to choosing your ideal evaporative cooler is choosing one with the right rating for your space. Therefore, you need to first calculate the CMH(m3/h) requirement of your cooler if you are seeking to know the right number of coolers to buy for your space.