Pukyong National University

A smart way to improve efficiency of new renewable energy systems
Professor Jeong Geun-joo

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) of Pukyong National University proposed the ’Measures for saving water heating energy through condensation heat recovery with Ground Source Heat Pump’ in the August 2017 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. <기사 보러가기(클릭!)>

3 August 2017

연구진
  정근주 envjung@pknu.ac.kr
  공과대학 환경설비연구실