| Title |
Applicability of Renewable Thermal Energy Systems on a Domestic Hot Water System for a Low-carbon Energy Share Community |
| Authors |
Min-Hwi Kim ; Dong-Won Lee ; Youngsub An ; Hong-Jin Joo |
| DOI |
https://doi.org/10.6110/KJACR.2020.32.11.532 |
| Keywords |
에너지공유 커뮤니티; 지열히트펌프; 태양광?열 시스템; 급탕에너지; 자가소비율 Energy share community; Ground source heat pump; Photovoltaic and solar thermal system; Domestic hot water energy; Self-sufficiency |
| Abstract |
In this study, a domestic hot water supply system using renewable heat energy systems was proposed for improving energy efficiency and savings to achieve a low-carbon energy sharing community. A smart village in Busan Eco Delta Smart City was selected for this analysis via detailed simulation. This smart village comprises 56 single-family houses and community facilities with a central mechanical center to supply heating, cooling and domestic hot water. In this study, the major thermal energy for domestic hot water is a geothermal heat pump, and applicability of solar energy, such as a photovoltaic (PV) system (Case 1), a solar thermal (ST) system (Case 2), and a photovoltaic and solar thermal (PVT) system (Case 3) was analyzed. As a result of this analysis, it was found that the ST system can account for 30.0% of the annual domestic hot water demand, and the PVT system can account for 10.0%. The PVT system showed 19.1% lower electric generation rates compared with the PV system. However, it was also found that the PVT system can reduce 22.0% and 37.2% of operating energy compared to the PV and ST system, respectively. The PVT can save the thermal demand of domestic hot water even the lower efficiency of PV generation rates. Conversely, it was observed that the PV and ST system showed higher self-sufficiency for the electric energy balance on the community compared to the PVT system depending on the size of the thermal energy storage. |