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首页> 美国政府科技报告 >Evaporative Precooler Retrofit for Air Cooled Condensers. Small Scale Appropriate Technology Grant Program
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Evaporative Precooler Retrofit for Air Cooled Condensers. Small Scale Appropriate Technology Grant Program

机译：空冷式冷凝器的蒸发式预冷器改造。小规模适当技术资助计划

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Three methods of evaporative cooling were evaluated; direct evaporative cooling of the condenser coil (spray directly on condenser coil), wetted media acting as evaporator and eliminator, and a spray type with eliminator. The direct spray achieved the lowest head pressure and greatest energy savings under all conditions. The major disadvantage in applying this method to an existing unit not designed for direct evaporative cooling is the inevitable build up of scale and decrease in heat transfer of the condenser. The direct spray type system should not be considered without some type of water treatment. The wetted media provided a temperature that had a closer approach to wet bulb temperature and less stratification than the spray system with eliminator. Its primary disadvantage was a reduction in air flow to the condenser of about 14%. This reduced air flow limited the effectiveness of the system at higher wet bulb temperature and could cause the condenser to use more energy as wet bulb approached dry bulb temperature. The spray with eliminators appears to be the best compromise for areas which have the possibility of high wet bulb temperature from time to time. The primary disadvantage, other than the somewhat lower approach to wet bulb, is the duct work required to allow the spray system and eliminator to be installed. A fourth method was considered - injection of precooled air to the condenser coil. Under this approach the condenser coil functions normally with an injection system around its perimeter. (ERA citation 09:006068)

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