High thermal density space consumes massive energy, and cooling device accounts for large percentage of total consumption. To cut down energy consumption of cooling device, PCHP is proposed on the basis of heat pipe and evaporation technologies. Heat transfer and energy consumption models of PCHP are developed. The effects of geometric and operational parameters on the PCHP performance, including pad thickness, ambient temperature and ambient relative humidity (RH), air flow rate, are investigated. The results show that cooling capacity increases with the increase of pad thickness and airflow rate, and it decreases with the increase of ambient temperature and RH. With the increase of thickness, energy efficiency ratio (EER) increases at the start and then decreases under RH20%-40%, while it decreases continuously under RH70%-90%. EER increases with the decrease of ambient temperature, ambient RH and air flow rate. PCHP markedly enhances annual free cooling time compared with conventional heat pipe system (CHP), and the maximal enhanced free cooling time and increasing percentage occur at Urumchi and Guangzhou Cities, respectively.

高热密度空间会消耗大量能源，而冷却设备在总消耗中所占的比例很高。为了减少冷却装置的能耗，在热管和蒸发技术的基础上提出了PCHP。建立了PCHP的传热和能耗模型。研究了几何和操作参数对PCHP性能的影响，包括垫厚度，环境温度和环境相对湿度（RH），空气流速。结果表明，冷却能力随着垫层厚度和气流速率的增加而增加，而随着环境温度和相对湿度的增加而降低。随着厚度的增加，能量效率比（EER）在开始时先升高，然后在RH20％-40％下降低，而在RH70％-90％下则连续降低。EER随着环境温度，环境RH和空气流速的降低而增加。与传统的热管系统（CHP）相比，PCHP显着延长了每年的自然冷却时间，并且最大的自然冷却时间的延长和百分比的增加分别发生在乌鲁木齐和广州。