Ground Source Heat Pump(GSHP) systems practically use the geothermal energy for heating, cooling and domestic hot water in same unit. However, in the design of residential buildings using boilers or district heating and cooling system, the load per unit area and load factor can be used conveniently....
Ground Source Heat Pump(GSHP) systems practically use the geothermal energy for heating, cooling and domestic hot water in same unit. However, in the design of residential buildings using boilers or district heating and cooling system, the load per unit area and load factor can be used conveniently. But when applied to a GSHP system, increased initial cost or performance degradation problem can occurs. In the study, we analyzed load per unit area with load factor, RTS with Bin method and dynamic simulation analysis to estimate design load, energy load and ground load in addition to system operation data. Evaluation of the floor heating performance of the 12 mm, 6 mm and capillary pipes is conducted to determine the performance with respect to GSHP operation characteristics. Anaysis result using the design load per unit area showed up to 36.6% lower than the demonstration test results, and those with RTS method and dynamic simulation showed up to 4.9% and 5.9%, respectively. As a result, RTS method and dynamic simulation are considered as the mose accurate in calculating design load. Analysis results of energy load by the dynamic simulation showed 8% higher at heating, 5.4% higher at cooling. Those by Bin method showed 14.3% less at cooling, 20.9% higher at heating. In addition, analysis results by load factor method were 34.9% less at heating, 41.3% less at cooling, Therefore, in design load analysis, the RTS and dynamic simulation are appropriate, and in energy load analysis, the dynamic simulation is appropriate. GSHP system is consisted of two 180m deep u-tube ground heat exchangers, heat pump unit and measurement instruments. It has the installed capacity of 5 RT and conditioning area of 62.23 m2. As a result, the cooling COP of the heat pump was 4.13 and the system COP 3.51 while CSPF was 3.32. The heating COP of the heat pump was 3.87 and the system COP 3.39 while HSPF 3.39. Moreover, according to measured EWT data, the cooling COP was 93.7% and the cooling capacity of 96.4%. On the other hand, during the heating operation, in-situ data shown the 1.7% less then the COP and heating capacity of 95.7%. And analysis of the heating operation for GSHP floor heating system was conducted, and capillary pipe results showed a indoor temperature of 16.7℃ with 1.3℃ higher than 12 mm, 1.6℃ higher than 6 mm. The floor temperature of capillary pipe was 22.6℃, 4.8℃ higher than 12 mm, 6.4℃ higher than 6 mm. Thus capillary pipe was higher indoor, floor temperature and faster response time by others pipe. Therefore, it is considered as suitable for residential GSHP system.
Ground Source Heat Pump(GSHP) systems practically use the geothermal energy for heating, cooling and domestic hot water in same unit. However, in the design of residential buildings using boilers or district heating and cooling system, the load per unit area and load factor can be used conveniently. But when applied to a GSHP system, increased initial cost or performance degradation problem can occurs. In the study, we analyzed load per unit area with load factor, RTS with Bin method and dynamic simulation analysis to estimate design load, energy load and ground load in addition to system operation data. Evaluation of the floor heating performance of the 12 mm, 6 mm and capillary pipes is conducted to determine the performance with respect to GSHP operation characteristics. Anaysis result using the design load per unit area showed up to 36.6% lower than the demonstration test results, and those with RTS method and dynamic simulation showed up to 4.9% and 5.9%, respectively. As a result, RTS method and dynamic simulation are considered as the mose accurate in calculating design load. Analysis results of energy load by the dynamic simulation showed 8% higher at heating, 5.4% higher at cooling. Those by Bin method showed 14.3% less at cooling, 20.9% higher at heating. In addition, analysis results by load factor method were 34.9% less at heating, 41.3% less at cooling, Therefore, in design load analysis, the RTS and dynamic simulation are appropriate, and in energy load analysis, the dynamic simulation is appropriate. GSHP system is consisted of two 180m deep u-tube ground heat exchangers, heat pump unit and measurement instruments. It has the installed capacity of 5 RT and conditioning area of 62.23 m2. As a result, the cooling COP of the heat pump was 4.13 and the system COP 3.51 while CSPF was 3.32. The heating COP of the heat pump was 3.87 and the system COP 3.39 while HSPF 3.39. Moreover, according to measured EWT data, the cooling COP was 93.7% and the cooling capacity of 96.4%. On the other hand, during the heating operation, in-situ data shown the 1.7% less then the COP and heating capacity of 95.7%. And analysis of the heating operation for GSHP floor heating system was conducted, and capillary pipe results showed a indoor temperature of 16.7℃ with 1.3℃ higher than 12 mm, 1.6℃ higher than 6 mm. The floor temperature of capillary pipe was 22.6℃, 4.8℃ higher than 12 mm, 6.4℃ higher than 6 mm. Thus capillary pipe was higher indoor, floor temperature and faster response time by others pipe. Therefore, it is considered as suitable for residential GSHP system.
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#냉난방 설계부하분석프로그램 에너지부하 지중열전도 지중열교환기
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