Geothermal technology and its applications in protected agriculture

Ground soure heat pump is a kind of mechanical equipment which can transform low-temperature heat source into high-temperature heat source. In this paper, the authors summarized the kinds of heat pumps and their respective advantages and disadvantages, mainly introduced the prensent situation of ground soure heat pump in overseas countries and China, discussed the research progess and the existing problems of heat pump in emerging protected cultivation, such as higher investment and low levels of control. The present research characteristics and some countermeasures were also presented.