Evaporative Cooling

cooling post

An evaporative cooler is a device that cools air through the evaporation of water. Evaporative cooling differs from typical air conditioning systems which use vapor-compression or absorption refrigeration cycles. Evaporative cooling works by employing water’s large enthalpy of vaporization. The temperature of dry air can be dropped significantly through the phase transition of liquid water to water vapor “evaporation”, which can cool air using much less energy than refrigeration. 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. Unlike closed-cycle refrigeration, evaporative cooling requires a water source, and must continually consume water to operate.

Air washers and wet cooling towers use the same principles as evaporative coolers but are designed for purposes other than directly cooling the air inside a building. For example, an evaporative cooler may be designed to cool the coils of a large air conditioning or refrigeration system to increase its efficiency.

Evaporative cooling is one of the most energy-efficient methods of cooling for a home, office, factory or work area. It is regarded as environmentally “safe” since the process uses no ozone depleting chemicals. They are best situated to areas where humidity is low, as lower humidity increases the effectiveness of the unit. They cool and filter the air and to work effectively windows and doors must be left open so this moist and hot air can be forced out from your home or office. ( Positive pressure )

Lowers Actual Temperature

Warm air is drawn through wetted filter pads. The outside air temperature is lowered by the evaporative process and the cool air is directed into your home. The cooling effect to your home will depend on the efficiency of the air conditioning system, the number of air changes produced by the fan and the prevailing temperature and humidity conditions on the day. Your dealer will be able to provide you with information on the temperature reduction that should be expected in your area. A system can be sized and designed to offer the best summer relief.

Lowers Effective Temperature

This is the temperature that people feel as a direct result of air movement over the body. The effective temperature should not be confused with the actual temperature as read from an ordinary thermometer on a hot day. When sensing a breeze we feel cooler, even though the air stream produced by the breeze is the same temperature as the air. The cooling effect of air in motion is due to increased skin surface evaporation. Heat is removed from the body so you feel cooler. This effective temperature drop can
be from 2 to 4 degrees below the still air temperature.

Reduces Radiated Heat to Occupants

In your home/building, under normal temperature conditions heat is radiated from the human body to surrounding walls and ceilings. However, as the temperature approaches 34 – 35°C, this heat is radiated back to the human body. Evaporative air conditioning prevents this by absorbing heat from the walls and ceilings with a constant flow of cool air – which ensures that people occupying your home can radiate heat at a faster rate and therefore remain much cooler.

100% Fresh Air

With evaporative air conditioning, there is a continuous flow of air into your
home/building. Fresh and cool, this airflow continually forces out stale air, which is
never re-circulated.

Filters Outside Air

Outside air often contains dust, pollen, and pollutants. Evaporative air conditioning prevents these substances from entering your home/building by filtering outside air through wet filter pads, flushing all airborne material from the air. Great for allergy suffers.