Solid desiccant heat pump system (SDHP) can handle sensible and latent heat load simultaneously with high coefficient of performance (COP). However, in such system, supply air temperature is relatively high and unstable due to the frequent switch between desiccant coated heat exchanger as evaporator and condenser. In order to overcome these drawbacks, the concept of semi-coupled solid desiccant heat pump (SCSDHP) system is proposed in this paper, then a mathematical model is established to investigate the feasibility of this novel system. Calculation shows that under ARI (Air-conditioning and Refrigeration Institute) summer condition silica gel coating with density of 0.25 kg m⁻² is optimal, and area ratio between desiccant coated evaporator and conventional evaporator of 1:1 is recommended. Furthermore, compared with conventional SDHP system, supply air temperature can be 4.5~7°C lower and the variation range of supply air temperature decreases by 16~21°C. Also, effects of main operating parameters including the temperature and relative humidity of outdoor air on the performance of SCSDHP system are investigated.

固态干燥剂热泵系统（SDHP）可以同时处理显热和潜热负荷，并具有较高的性能系数（COP）。然而，在这样的系统中，由于频繁地在作为蒸发器和冷凝器的涂覆干燥剂的热交换器之间进行切换，因此供气温度相对较高并且不稳定。为了克服这些缺点，本文提出了半耦合式固体干燥剂热泵（SCSDHP）系统的概念，然后建立了数学模型来研究该新型系统的可行性。计算表明，在ARI（空调制冷学会）夏季条件下，硅胶涂层的密度为0.25 kg m ^{- 2}最佳，推荐的干燥剂涂层蒸发器与常规蒸发器的面积比为1：1。此外，与传统的SDHP系统相比，送风温度可以降低4.5〜7°C，送风温度的变化范围减小16〜21°C。此外，还研究了包括室外空气的温度和相对湿度在内的主要操作参数对SCSDHP系统性能的影响。