Simulating and analyzing the applying of the double coupling heat pump system in cold area after analyzing the feasibility of it,the result reveals that the simulated system can be used for the heating of the villa district in cold area.

On the basis of this,an ecological cycle heating system,the double stage coupling heat pump system which used air as low-level heat source,was designed.

The double stage coupling heat pump system(DSCHP)is a novel heating and cooling system which use outside air as low grae heatr source and suit for application in cold regions.

Predicts the energy consumption of the double stage coupling heat pump system during heating period in major cities of these areas using the running and simulating mathematical model.

Performance test and analysis of a heating system with doublestage coupling heat pumps in Beijing;

Some simple summaries of the research and development of DSCHP are presented in this paper,mainly included forms of DSCHP,predictive analysis of applying DSCHP in "Sanbei"regions,experiment studies of air-to-water heat ump applied in single-double stage mixed heat pump,the application and performance test of DSCHP and et al.

Domestic and overseas study of ground-coupled heat pump systems;