Abstract
In order to develop air-conditioning system using ground heat that realize high energy efficiency and low construction cost for residence, we approach a ground coupled heat pump system utilizing direct evaporating/condensing groud heat exchangers. We researched basic operating characteristics of the system through experiment. Experimental facility consists mainly of groud heat exchangers, a ground source heat pump, and a temperature-controlled water tank for thermal loading. The ground heat exchangers are vertical copper U-tubes and have the range from 20.5 to 40.5 meters in depth below the surface. In this study, we used three 20.5m^depth ground heat exchangers and operate the system both in heat-source mode and in heat-sink mode. Thermal output from the heat pump was sufficiently stable in heat-source mode and COP was around 4. On the other hand, operation in heat-sink mode was unstable and the thermal output changed with changing suction/discharge pressure of compressor and refrigerant flow rate.
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