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응축열을 이용한 냉방-급탕 복합형 GSHP시스템의 성능평가 실험
장형문,이규남,정근주 대한건축학회지회연합회 2020 대한건축학회연합논문집 Vol.22 No.2
Ground-Source heat pump(GSHP) system uses geothermal energy to provide space cooling or heating. GSHP makes use of energy stores in ground as heat source or heat sink. It is more energy-efficient way of heating and cooling buildings. That is because ground temperature is lower than air temperature in summer time, and higher than air temperature in winter time. Moreover, ground temperature always keep stable during years. But, when the GSHP system runs long time, ground temperature will be changed. and the performance of the GSHP system will be affected. GSHP also can be used as domestic hot water(DHW) system. But the lower temperature of the heat source makes it difficult to get high temperature hot water. Therefore, a GSHP Cooling & DHW combination system was proposed in this study. In the proposed combination GSHP system the condensation heat from the condenser of GSHP cooling system is reused as the heat source of the DHW heat pump. Hence the drop in ground temperature caused by the long time operation of GSHP cooling system will be improved. In order to evaluate the performance of the combination GSHP system, mock-up experiments were conducted. as comparison, the performance of GSHP cooling-only system and GSHP DHW-only system in the same experimental conditions were evaluated too. As experimental results, the coefficient of performance(COP) of the cooling heat pump of the combination system is about 12.93% higher than GSHP cooling-only system, and the COP of the DHW heat pump of the bombination system is about 15.47% higher than GSHP DHW-only heat pump system.
보일러 용량과 온수온도에 따른 복사난방 시스템의 열효율 평가
장형문(Xinwen Zhang),최지수(Ji Su Choi),김상엽(Sang Yeop Kim),김찬희(Chan Hee Kim),박종호(Jong Ho Park),정근주(Gun Joo Jung) 대한설비공학회 2021 대한설비공학회 학술발표대회논문집 Vol.2021 No.6
With the building insulation system strengthened, the heating load of apartment building has been gradually reduced. Therefore, the capacities of the most domestic gas fired boilers are over-sized and the boilers will work for a long time under the part load condition. This leads to a decrease in heating system efficiency. This study aimed to evaluate the heating efficiency variation of radiant heating system under different heating load conditions. In this study, three types of boilers with different capacity were selected as heat source of heating system, and the boiler efficiency with different hot water temperature were analyzed with different heating load and hot water temperature conditions through mock-up experiments. The results showed that the boiler efficiency decreased when the part load ratio was reduced. In the same part load condition, the non-condensing gas boiler with small capacity resulted in the higher efficiency than that with large capacity. It was also found that the condensing boiler led to the higher efficiency than non-condensing boilers under part load conditions.