Direct Evaporative Cooling
Evaporative cooling is a process of heat and mass transfer based on the transformation of sensible heat into latent heat. The non-saturated air reduces its temperature, providing the sensible heat that transforms into latent heat to evaporate the ?, water. If the process develops in ideal adiabatic conditions, the dry-bulb air temperature decreases as this transformation increases its humidity. This heat exchange continues until the air reaches its saturated state, when the air and water temperature reach the same value, called “adiabatic saturation temperature ‘,this process is known as adiabatic saturation.
Indirect Evaporative Cooling
Indirect Evaporative Cooling System uses Polymer type Sensible Heat Exchanger to remove heat from the primary air stream by means of cold secondary Air Stream or Scavenge Air steam. In Indirect Evaporative Process air moisture content stays constant during temperature decreasing. Indirect Evaporative cooling systems take advantage of Evaporative cooling effects, but cools without raising indoor humidity. As cooling of the prima, airstream takes place by heat transfer across the heat exchanger walls without the mixing of the two air streams, the prima, airstream becomes cooler without increasing its humidity.
Indirect Direct Evaporative Cooling
Two-stage indirect direct evaporative coolers can cool air to lower temperatures than are attainable with direct (“one-stage”) evaporative coolers and add Ass moisture to the indoor air. In these coolers, a first-stage indirect evaporative cooler lowers both the dry-bulb temperature (OBT) and WBT of the incoming air. After leaving the indirect stage, the supply air passes through a second-stage. Figure on the left shows the cooling process on a psychometric chart. First-stage cooling follows a line of constant humidity ratio as no moisture is added to the primary airstream; the second stage follows the WBT line at the condition of the air leaving the first stage.
Why Choose Indirect Direct Evaporative Cooling
- Indirect Direct Evaporative Cooling Provide better comfort Conditions. Lowers the supply Air dry bulb temperature below ambient wet-bulb temperature.
- Evaporative cooling is highly energy-efficient and it permits a wide range of applications and versatility in the buildings, dwellings, commercial and industrial sectors.
- Environmentally friendly as no harmful chemical used.
- Provide 100, fresh air to the building and forcing stuffy & stale air out.
- Lower equipment & installation cost compared to expensive refrigeration systems.
- Low maintenance cost.
- Can be operated in various Modes as per Weather Conditions.
- Used in Monsoon while using First Stage (Indirect Cooling).
Features of a Modern and Reliable Indirect Direct Evaporative Cooling (IDEC)
- Use of quality grade aluminium that forms an ultra-rigid frame.
- High-efficiency fans, certified by the AMCA for best-in-class air performance.
- Sturdy construction.
- Greater and improved thermal insulation.
- Can be equipped with various types’ filters that possess. amounts of dust, and also do not get adversely affected by lower pressure drop.
- Compact design.
- Automation is available.
- Available in Blow through or Draw through construction.
Advantages of evaporative cooling systems in comparison with Air conditioning systems
- Reduction in Input power and input current.
- Using water as the working fluid which is environmentally friendly.
- Elimination of CFC gases which are harmful to the ozone layer.
- Ability to induce 100, fresh air into the room and improved IAQ.
- Low Initial & Maintenance Cost.