Air Conditioning Performance of Ground Source Heat Pump Using Residential Steel Pipe Pile

Abstract

The purpose of this study is to investigate a heat exchange performance of a direct expansion type heat pump when an underground heat exchanger is inserted into a steel pipe pile. The underground heat exchanger is a U-shaped pipe with one copper pipe (outer diameter 4.0 mm, wall thickness 0.8 mm, length 10 m) and two copper pipes (same standard as one side) connected at the bottom. 12 underground heat exchangers are used, and 1.8 kg of R32 is used as the refrigerant. As a result of the experiment, the average coefficient of performance(COP) was 6.7 at the cooling set temperature of 25℃. It became 5.7 at the cooling set temperature of 27℃.