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GSHP용 수직형 지중열교환기의 열전달 성능에 관한 연구
정민호(Min-Ho Chung),장기창(Ki-Chang Chang),나호상(Ho-Sang Ra),백영진(Young-Jin Baik),박성룡(Seong-Ryong Park),유성연(Seong-Yeon Yoo) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
GSHP systems are used for air-conditioning systems in co㎜ercial buildings, schools, and factories because of low operating and maintenance costs. These systems use the earth as a heat source in heating and a heat sink in cooling mode. Ground heat exchangers are classified by a horizontal and vertical type according to the installation method. Vertical type is usually constructed by placing small diameter high density polyethylene tube in a vertical borehole. Vertical tube sizes range from 20 to 40 ㎜ nominal diameter. Borehole depth range between 100 and 200 m depending on local drilling conditions and available equipment. In this study, to evaluate the performance of single u-tube with bentonite grouting, single u-tube with broken stone grouting and double u-tube bentonite grouting of vertical ground heat exchangers, test sections are buried on the earth and experimental apparatus is installed. Therefore the heat transfer performance and pressure loss of these are estimated.
벽체매립형 폐열회수 환기시스템의 열회수 성능 향상에 관한 실험적 연구
정민호(Min-Ho Chung),오병길(Byung-Kil Oh) 대한설비공학회 2014 설비공학 논문집 Vol.26 No.2
Exhaust heat recovery ventilation systems conserve energy through enthalpy recovery between air intake and exhaust, and they are being increasingly used. An exhaust heat recovery ventilation system can be installed in the ceiling of a balcony or emergency evacuation space. However, in the case of fire, the emergency evacuation space has to by law remain as empty space, and therefore, a ventilation system can’t be installed in an emergency evacuation space. Therefore, the need for a proper installation space for a ventilation system is emphasized. In this study, to install a heat recovery ventilation system in a lightweight wall, a heat exchanger was assembled of thickness below 140 mm. The efficiency of heat recovery was analyzed through performance experiment, in the case of the cooling and heating mode. The heat recovery efficiency increases when the surface area is increased, by using closer channel spacing in the heat exchanger, or by increasing the size of the heat exchanger.