The conventional heating mode is a one-way circulation in cold areas, which causes abatement in the reserves of energy source and increases environmental pollution. An ecological cycle heating system, an air-to-water + apartment water-to-water double-stage coupled heat pump system, is presented in this paper based on analyzing the characteristics of the villa district heating. Prediction and analysis of the feasibility of the double-stage coupled heat pump system in cold areas were carried after the components and characteristics of the system are introduced. The lumped parameter method was used to establish a mathematical model of the whole system, and the system control methods and the volume of the heat storage tank were decided to get the best value of the heating seasonal performance factor (HSPF). Furthermore, the application of the double-stage coupled heat pump system in some representative cities of cold areas in China was analyzed. The results show that the novel heat pump system can be used for heating the villa district in cold areas. To make the HSPF of the system much better, the water circulations of the double-stage coupled heat pump system also were analyzed in this paper; some improvements are put forward, and single-double stages mixed heat pumps system for the villa districts heating are introduced.
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