由于能源成本不断增加，高效空调的需求得到了广泛认可，许多研究人员已经研究了如何在连续运行的情况下改进热泵。然而，在开关操作期间，能量效率比（EER）的降低被认为是不可避免的，并且已经提出了新的容量控制系统。但在不稳定的条件下，他们开始研究泵的动态特性，所以他们的研究往往涉及到很高的成本。考虑到制冷剂分布的变化，本文提出了设计指南，并讨论了四种提高效率的替代控制系统。 由于加拿大ASH压缩机的故障调查，第2部分也有助于ASH压缩机的故障保护

Since the cost of energy keeps increasing, the need for high-efficiency airconditioners is widely recognized, and many researchers have investigated waysto improve a heat pump under continuous operation. The reduction of the EnergyEfficiency Ratio (EER) during on-off operation, however, was thought to beinevitable, and new capacity control systems have been proposed. Thesesystems are really effective, but they often involve high costs, so researchwas begun into the possibility of improving the dynamic characteristics of aheat pump under unsteady conditions.Taking into consideration variations in the refrigerant distribution, this paper proposesguidelines for designs and discusses four alternative control systems forincreasing efficiency.Results of this investigation may also contribute to better designs forprotection of the compressor from breakdowns due to liquid slugging, etc.