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백남춘(Namchoon Baek),김성범(Sungbum Kim),신우철(Ucheul Shin) 대한설비공학회 2016 설비공학 논문집 Vol.28 No.10
A ground source heat pump system maintains a constant efficiency due to its stable heat source and radiant heat temperature which provide a more effective thermal performance than that of the air source heat pump system. As an eco-friendly renewable energy source, it can reduce electric power and carbon dioxide. In this study, we analyzed one year of data from a web based remote monitoring system to estimate the thermal performance of GSHP with the capacity of 3RT, which is installed in a low energy house located in Daejeon, Korea. This GSHP system is a hybrid system connected to a solar hot water system. Cold and hot water stored in a buffer tank is supplied to six ceiling cassette type fan coil units and a floor panel heating system installed in each room. The results are as follows. First, the GSHP system was operated for ten minutes intermittently in summer in order to decrease the heat load caused by super-insulation. Second, the energy consumption in winter where the system was operated throughout the entire day was 7.5 times higher than that in summer. Moreover, the annual COP of the heating and cooling system was 4.1 in summer and 4.2 in winter, showing little difference. Third, the outlet temperature of the ground heat exchanger in winter decreased from 13℃ in November to 9℃ in February, while that in summer increased from 14℃ to 17℃ showing that the temperature change in winter is greater than that in summer.
백남춘(Namchoon Baek),김성범(Sungbum Kim),오병칠(Byungchil Oh),윤종호(Jongho Yoon),신우철(Ucheul Shin) 대한설비공학회 2015 설비공학 논문집 Vol.27 No.7
This study analyzed analyzes the energy performance of six houses in Daejeon completed which were built in 2011. Observed The observed houses, which were all designed and constructed inof the same size and structure, are were highly insulated with triple Low-E coating windows; the insulation level of the walls is was 0.13 W/㎡K and that of the roof is was 0.10 W/㎡K. As electric houses, all of the energy supplied to the houses, including for cooking, is was supplied by electricity. A and 3~4 kWp of photovoltaic system and a 3~5 kW of ground source heat pump (GSHP) were installed in each house tofor providing provide space heating/and cooling and hot water are installed. We constructed a Web-based remote monitoring system in order to understand energy consumption and the dynamic behavior of the energy system. T, and the results of our metering data analysis of 2013 are as follows. First, the annual residential energy consumption is was 4,400 kWh (σ = 1,209) and GSHP energy consumption is was 5,182 kWh (σ = 1,164). Second, residential energy consumption ranked highest in average energy usage, with at 45% of the total, followed by heating with at 30%, hot water supply with at 17% and cooling with at 6%. Third, the average energy independence rate is was 51.8%, the GFA (Gross gross floor area) criteria average energy consumption unit is was 48.7 kWh/㎡yr (σ = 10.1), and the net energy consumption unit (except the energy yield of the PV systems) is was 24.7 kWh/㎡yr (σ = 8.8).