Economical air Conditioning

Indirect-direct /2 Stage Evaporative Cooling unit:

In the first stage of a two-stage cooler, warm air is pre-cooled indirectly without adding humidity (by passing inside a “JPC” Make heat exchanger that is cooled by evaporation on the outside). In the direct stage, the pre-cooled air passes through a water-soaked pad and picks up humidity as it cools.Since the air supply is pre-cooled in the first stage, less humidity is transferred in the direct stage, to reach the desired cooling temperatures. The result is cooler air with an RH between 50-70%, depending on the climate, compared to a traditional system that produces about 70–80% relative humidity in the conditioned air.

Indirect Evaporative Cooling unit:

In the first stage of an Indirect evaporative cooler, warm air is pre-cooled indirectly without adding humidity (by passing inside a “JPC” Make heat exchanger that is cooled by evaporation on the outside). Air is cooled without adding moisture in the air stream. The result is cooler air with an RH between 50-70%, depending on the climate, compared to a traditional system that produces about 70–80% relative humidity in the conditioned air.In the first stage of an Indirect evaporative cooler, warm air is pre-cooled indirectly without adding humidity (by passing inside a “JPC” Make heat exchanger that is cooled by evaporation on the outside). Air is cooled without adding moisture in the air stream. The result is cooler air with an RH between 50-70%, depending on the climate, compared to a traditional system that produces about 70–80% relative humidity in the conditioned air.

Hybrid Evaporative Cooling unit:
Direct or Indirect cooling has been combined with vapour-compression or absorption air conditioning to increase the overall efficiency and /or to reduce the temperature below the wet-bulb limit.

Single Stage Evaporative Cooling unit:
In Single-stage of evaporative cooling unit, Warm air is passed through Cellulose pads of 4 to 12 inches (100 mm to 300 mm) depth, which has a honeycomb design to make it more efficient. Air is cooled by evaporation technology when warm air and cool water comes in direct contact with each other. The temperature of air is reduced up to 10-15 degree centigrade depending on the RH and Ambient temperature by adding humidity up to 70-85 % RH.

Energy savings

Evaporative coolers use a supply fan and a fractional horsepower sump pump. They do not use an energy-intensive refrigerant compressor, so they require 70 to 80% less electricity to operate as compared to refrigerated cooling. Energy cost not spent on cooling electricity is available for other necessary expenditures and can continue to add savings to the owner/organizations’ budget and also provide greater energy independence for the society.

Less maintenance

Maintenance requirements for evaporative cooling systems are far simpler than for refrigerated air conditioning equipment. Refrigeration compressors, evaporators and condensers must operate under high pressures, which require specialized tools and qualified and experienced maintenance personnel. Evaporative Cooler users can maintain their peak cooling effectiveness without the need for costly and sometimes unavailable specialized maintenance resources. This translates into increased reliability and a consistent environment, one that is conducive to the improved comfort at in the residential and commercial spaces and offer enhanced employee performance and productivity in the industry due to comfortable indoor environment.

Life-cycle cost

The life-cycle cost of using evaporative cooling is less than a comparable refrigerated air unit. This includes all money values such as first cost, energy, water, time value of money and maintenance costs. All evaporative cooling based systems save water at the power plant. During hot summer, a coal-fired power plant using evaporative cooling towers will typically need about 4 litres per kWh. This quantity does not include the water needed to mine, process and deliver the coal used to generate the electricity. The amount of water used by a Direct Evaporative Cooler is stated in terms of litres of water/TR tons of cooling. On average 8 to 10 litres of water is used to provide approximately 1 Ton of cooling with Direct Evaporative Cooler. Advanced Indirect- Direct Evaporative Coolers use 35 to 40% less water to deliver the same amount of cooling.

No chemical refrigerants

Evaporative cooling does not directly use any chemical substances that are known to be detrimental to the earth’s ozone layer. This is unlike most of the Pre-2000 commercial refrigerants whose use is regulated in order to reduce their harmful impact on the ozone layer. Evaporative coolers do not operate under high-pressure conditions and do not require any expensive controlled substances for their operation.

Indirect evaporative Cooling

Indirect evaporative cooling is a sensible cooling process that uses evaporative cooling as the heat sink for removing sensible heat from the process air. These systems cool the primary air stream or process air stream with evaporatively cooled secondary air streams. Two streams are isolated from each other by means of a thin wall made of polymer or metal. Both air streams travel either opposite or at right angle to each other on a continuous basis. Water is evaporated in the secondary stream, which cools the air and subsequently the wall material. This saturated air is exhausted back to the ambient.

On the other side of the wall, the process air or primary air stream losses the heat to the cooled wall and becomes cooler but remains as dry as it was to start with because no moisture was added to this stream.