由张春路（通讯作者）、袁晗撰写的论文An important feature of air heat pump cycle: Heating capacity in line with heating load在国际能源期刊Energy, 2014年第72卷在线发表。论文发现并从理论上证明了空气压缩热泵(reversed Brayton cycle heat pump)的一个重要特性，即制热量与实际的热负荷的变化趋势一致。这一特点与传统的蒸气压缩式热泵截然不同（如附图所示），有助于空气压缩热泵的实际应用。

论文链接：http://www.sciencedirect.com/science/article/pii/S0360544214006215

论文摘要：In the conventional vapor-compression heat pumps, the heating capacity and the heating load usually vary in opposite directions, which results in a mismatch of the heating capacity and the heating load at off-design conditions. Air (reversed Brayton) cycle is a potential substitute for the conventional vapor-compression cycles. This paper proved that in theory the air heat pump cycle can make the heating capacity in line with the heating load at a stable level of heating COP (coefficient of performance). A thermodynamic model for the air heat pump cycle with practical compressor and expander was developed. The optimal heating COP and the corresponding pressure ratio were derived from the model. Then the cycle performance was analytically expressed under the optimal COP conditions. The heating capacity under different operating conditions was found in line with the heating load. Comparisons between the air heat pump cycle and two typical vapor-compression heat pump cycles were numerically done for further verification. It also turned out that the energy efficiency of air heat pump is comparable to the transcritical CO2 heat pump, particularly at large temperature difference.

Figure - Comparison of volumetric heating capacity at different heat source temperature

(不同热源温度下不同热泵循环的容积制热量比较)