Study on Heat Exchange Properties and Application Potential of Closed Loop Vertical GCHE of GSHP System in Taiwan -- Taking Experiments in Tainan as Examples

• Main Authors: PengLi, 李鵬
• Other Authors: Hsien-Te Lin
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/u64jzz

博士 === 國立成功大學 === 建築學系 === 106 === Extended Abstract SUMMARY Ground Source Heat Pump(GSHP) is a widely used technology. GSHP with closed loop vertical Ground Coupled Heat Exchanger(V-GCHE) is very common type and has very stable performance, which can be used in building’s air conditioning or hot/cold water system to save energy. However, the research of this type of GSHP is still lack in Taiwan. This paper, with the purpose to find proper way to utilize the GSHP technology, provides the geothermal temperature of different areas in Taiwan and analyzes the heat exchange properties in closed loop V-GCHE on the basis of series of experiments launched in Tainan, where 4 Boreholes with 60m depth were drilled for a six-month research. Conclusions of this study include: 1) underground temperature of experimental site is a little high, average temperature is 27.56 ℃ in 53.5m depth; 2) heat in soil diffuses very slowly, and the accumulation of heat causes rise of the underground temperature; 3) in experiments, underground temperature changes obviously in first 5-6 hours but keeps approximately the same after 20-23 hours; 4) under certain conditions, thermal transfer efficiency of double-U type of GSHE is better than single-U type; 5) intermittent heating can increase the sustainability of the system; 6) a whole period assessment is necessary to ensure the sustainability and economic feasibility; 7) Hybrid-GSHP can be used in Taiwan to balance the unbalanced cooling or heating load of AC systems in many buildings.