Water heat pump system in greenhouse by using underground water for snow melting

Abstract

It gains much attractive attention on the increasing oil price that derived from a energy shortage, decreasing earning power in agricultural field caused by price rising of oil, and environmental problems of using fossil fuel. In order to reduce oil dependency, the heat pump (HP) with greatly improving performance has aroused remarkable concern again in recent years; especially water heat pump was widely used in agricultural field. However, the problem remains in an initial investment such as the cost of digging in the groundwater well, which restricts the development of heat pump. Thereby, it deserves much more attention to use melting snow well largely in cold regions covered with snow so as to save investment of machinery equipment. The existing equipment can be used as heat supply and then to build compatible type heating systems without using oil. Coefficient of Performance (COP) is used to evaluate heat pump cropping system that can be obtained based on calculating temperature of groundwater, internal temperature in greenhouse, the temperature and flux at alleyway of groundwater drained by heat pump, and electric consumption.