Jong Min Choi

Performance Simulation of Ground-Coupled Heat Pump(GCHP) System for a Detached House

ABSTRACT:Ground-coupled heat pump(GCHP) systems have been shown to be an environ- mentally-friendly, efficient alternative to traditional cooling and heating systems in both residential and commercial applications. Although some work related to performance evaluation of GCHP systems for commercial buildings has been done, relatively little has been reported on the residential applications. The aim of this study is to evaluate the cooling and heating performances of a vertical GCHP system applied to an artificial detached house(117 m 2 ) in Seoul. For this purpose, a typical design procedure was involved with a combination of design parameters such as building loads, heat pump capacity, borehole diameter, and ground thermal properties, etc. The cooling and heating performance simulation of the system was conducted with different prediction times of 8760 hours and 240 months. The performance characteristics including seasonal system COP, average annual power consumption, and temperature variations related to ground heat exchanger were calculated and compared.Keywords:Ground-coupled heat pump(지열 히트펌프), Vertical ground heat exchanger(수직형 지중열교환기), Detached house(단독주택), Hourly performance simulation(시간대별 성능 분석), Monthly performance simulation(월간 성능 분석)

Performance Analysis of Energy-Slab Ground-Coupled Heat Exchanger

ABSTRACT:Recently, utilization of building foundations as ground-coupled heat exchangers has attracted much attention because they reduce the cost and enhance the heat transfer. The objective of this study is to evaluate the performance of energy-slab ground-coupled heat exchanger installed in a commercial building. In order to demonstrate the energy transfer characteristics of the energy-slab, experiments were conducted from October 2010 to September 2011. The 1-year measurement results showed that the mean EWTs of brine returning from the energy-slab were 9.6℃ in heating season and 24.9℃ in cooling season, which were in a range of design target temperatures. In addition, the geothermal heat pump system with the energy-slab showed on-off operation according to the setting temperatures of secondary fluid in water storage tank. The results also showed that the energy-slab extracted heat of 198.6 kW from the ground and injected heat of 318.9 kW to the ground, respectively.Keywords:Energy-slab(에너지슬래브), Building foundation(건물 기초), Ground-coupled heat exchanger(지중열교환기), Geothermal heat pump(지열 히트펌프), Performance(성능)