| 신재생에너지시스템 효율 높이는 방법은? (A smart way to improve efficiency of new renewable energy systems) | |||
| 작성자 | 대외협력과 | 작성일 | 2017-08-03 |
| 조회수 | 671 | ||
| 신재생에너지시스템 효율 높이는 방법은? (A smart way to improve efficiency of new renewable energy systems) | |||||
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대외협력과 | ![]() |
2017-08-03 | ![]() |
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GSHP는 땅 속에 파이프를 묻고 여기에 물을 순환시켜 열을 얻는 냉난방 시스템이다. 그러나 GSHP는 가동 시간이 경과할수록 땅 속으로 발산되는 응축열로 인해 지열히트싱크의 온도가 증가해 효율(성능계수‧COP)이 감소하는 문제가 있다. 또 호텔 등 급탕수요가 많은 건물의 공기열원히트펌프 급탕시스템의 경우 지열방식에 비하여 성능이 낮다는 문제가 있다. 이에 따라 정 교수는 GSHP를 냉방 운전할 때 땅 속으로 사라지는 응축열을 급탕히트펌프의 증발기에서 곧바로 회수해 급탕시스템의 효율을 높이는 동시에 GSHP의 지중히트싱크 온도상승도 지연시킴으로써 두 히트펌프의 효율을 높여 에너지를 절약할 수 있다고 주장했다. GSHP를 냉방으로 가동할 경우, 응축기로부터 지중으로 향하는 순환수 온도는 가동 후 시간이 경과할수록 높아지는데 이 순환수를 급탕히트펌프 증발기에 공급, 열을 회수(냉각)한 다음 지중 히트싱크로 보낸다는 것이다. 그러면 급탕히트펌프 증발기는 고온의 순환수로부터 양질의 증발열을 확보해 효율이 높아지고, GSHP는 낮은 순환수 온도를 유지하므로 지중 히트싱크 과열을 지연시킬 수 있어 GSHP의 효율이 증가하는 것으로 나타났다. 정 교수는 “신재생에너지의 의무적용 비율이 21% 수준으로 높아져 GSHP 냉난방시스템의 적용이 확대되고 있다.”면서, “GSHP 응축열과 급탕 폐열 회수 방안을 적용한다면 냉방부하 및 급탕부하가 큰 건물에서 에너지 효율을 높일 수 있다.”고 말했다. <부경투데이> A research attracts attention to use the new renewable energy system, Ground Source Heat Pump (GSHP) for building air conditioning and heating to recover heat losing to the ground and use it to make the required hot water in saunas, swimming pools, including hotels. Professor Jeong Geun-joo (Dept. of Architectural Engineering, in the photo) of Pukyong National University proposed the 'Measures for saving water heating energy through condensation heat recovery with Ground Source Heat Pump' in the August issue of the recently published monthly 「The Construction Information of Busan」. GSHP is an air-conditioning and heating system that circulates water through pipes in the ground to obtain heat. However, GSHP has a problem that efficiency (performance coefficient and COP) decreases as the temperature of the geothermal heat sink increases due to condensation heat radiating into the ground with the lapse of time. In addition, in the case of an air heat source heat pump hot water supply system in buildings with high demands for hot water, such as hotels, there is a problem that performance is lower than that of a ground source heating pump system. Accordingly, Professor Jeong explained energy savings can be achieved by improving energy efficiency, when cooling the GSHP, the condensation heat that disappears into the ground is recovered directly from the evaporator of the hot water heat pump to increase the efficiency of the hot water supply system and at the same time, the efficiency of the two heat pumps by delaying the temperature rise of the GSHP underground heat sink. When the GSHP is operated in cooling, the temperature of the circulating water from the condenser to the ground increases as the time elapses after operation, which supplies the circulating water to the hot water heat pump evaporator, recovers (cools) the heat, and sends it to the underground heat sink. Then, the hot water heat pump evaporator ensures high-quality evaporation heat from a high temperature circulating water, thereby increasing efficiency, and GSHP maintains a low circulating water temperature, thereby delaying overheating of the underground heat sink. As a result, the efficiency of GSHP has improved. Professor Jeong said, "As the mandatory application rate of new and renewable energy increases to the level of 21 %, the application of the GSHP heating and cooling system is expanding. If GSHP condensation heat and waste heat recovery methods from hot water are applied, energy efficiency can be increased in buildings with large cooling and hot water supply loads." <Pukyong Today> |