Utilization of PCM-to-Air Heat Exchangers (PAHXs) in building free cooling applications has been reporting the insufficient cooling charging energy during the PCM solidification, which affects the overall system performance. This study reports the improvements in the cooling potential of the PAHX considering the climatic characteristics of the hot desert climate by taking the advantage of thermal radiation losses to the sky during nighttime. Parametric studies were conducted for the developed PAHX unit with respect to the location, airflow rate, and the PCM type. The improved PAHX unit was integrated into the mechanical ventilation system of an office space under hot desert climatic conditions considering various operational conditions. It was concluded that the PAHX unit outlet air could be directly supplied to the indoor space through a direct free cooling application to satisfy the cooling demand; also, it could be introduced to the mechanical cooling unit to minimize the energy consumption. The results showed that the thermal comfort levels were enhanced by up to 18%, and the cooling system energy consumption was reduced by 18.5% saving an amount of energy up to 10.8 kWh/week.

据报道，在建筑物免费的冷却应用中使用PCM空气换热器（PAHX），在PCM固化过程中冷却充能不足，这会影响整个系统的性能。这项研究报告指出，考虑到沙漠热气候的气候特征，PAHX的冷却潜力得到了改善，它利用了夜间热量散失到天空的优势。对开发的PAHX装置进行了有关位置，气流速率和PCM类型的参数研究。考虑到各种操作条件，在炎热的沙漠气候条件下，改进的PAHX单元已集成到办公室空间的机械通风系统中。结论是，PAHX单元的出口空气可以通过直接的自由制冷应用程序直接供应到室内空间，以满足制冷需求；也可以将其引入机械冷却装置以最大程度地减少能耗。结果表明，热舒适度提高了18％，冷却系统能耗降低了18.5％，从而节省了高达10.8 kWh / week的能量。