Evaporative cooling (EC) is an energy efficient and environmental friendly technology which uses water evaporation
to absorb the heat from surroundings and produce cooling air. EC has limited application cases in hot and humid
regions because of the relatively low cooling capacity. In recent years, the study on hybrid EC and traditional
mechanical cooling becomes the trend to break the region limitation of the technology. This paper carries out a case
study for applying the Regenerative Indirect Evaporative Cooling System (RIECS) to an all-fresh-air hybrid airconditioning
system of a wet market in Hong Kong. The condense water from an air-handling unit (AHU) is collected
and used as cooling medium sprayed onto the heat exchanger of an IEC equipment. At the same time, the
contaminative and exhausted air from the wet market returns to the IEC equipment to cool the intake fresh air, so that
the fresh air pre-cooling before it enters to the AHUs is realized. The energy saving and economic efficiency were
analyzed and compared among RIECS, rotating heat recovery wheel system and the A/C system without heat
recovery. The results show that RIEC system has the largest annual energy saving potential with a payback period of
2.9 years, which shows a great potential of its application in Hong Kong.
including that from the main cooling coil of the CAP AHU, is first supplied to the pre-cooling
coil of the CAP AHU and is then routed through the cooling tower, which significantly reduces potable
water usage and improves cooling tower water chemistry. It is found that condensate production is large
enough to make pre-cooling cost-beneficial with energy savings of approximately 10% and the ability to
offset cooling tower water demand in excess of 50%.
Evaporative cooling (EC) is an energy efficient and environmental friendly technology which uses water evaporationto absorb the heat from surroundings and produce cooling air. EC has limited application cases in hot and humidregions because of the relatively low cooling capacity. In recent years, the study on hybrid EC and traditionalmechanical cooling becomes the trend to break the region limitation of the technology. This paper carries out a casestudy for applying the Regenerative Indirect Evaporative Cooling System (RIECS) to an all-fresh-air hybrid airconditioningsystem of a wet market in Hong Kong. The condense water from an air-handling unit (AHU) is collectedand used as cooling medium sprayed onto the heat exchanger of an IEC equipment. At the same time, thecontaminative and exhausted air from the wet market returns to the IEC equipment to cool the intake fresh air, so thatthe fresh air pre-cooling before it enters to the AHUs is realized. The energy saving and economic efficiency wereanalyzed and compared among RIECS, rotating heat recovery wheel system and the A/C system without heatrecovery. The results show that RIEC system has the largest annual energy saving potential with a payback period of2.9 years, which shows a great potential of its application in Hong Kong.including that from the main cooling coil of the CAP AHU, is first supplied to the pre-coolingcoil of the CAP AHU and is then routed through the cooling tower, which significantly reduces potablewater usage and improves cooling tower water chemistry. It is found that condensate production is large
enough to make pre-cooling cost-beneficial with energy savings of approximately 10% and the ability to
offset cooling tower water demand in excess of 50%.
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