The ground-source heat pump (GSHP) technology has been brought to the attention of the north America, European countries and Japan for a number of desirable characteristics, including good energy saving performance, less harm to environment, high efficiency, low maintenance costs, and low life cycle cost. They have broadened in application in these areas. There are some research works on GSHP having been done in our country since last century 80's. The research works were concentrated on feasibi...