Economical Analysis of a Small Capacity Heat Pump utilizing Heat Sources of Air, Geothermal and Underground Water Tank using Dynamic Simulation

Abstract Due to reinforcement of international environment regulation and high oil prices, interest in renewable energy is growing. Countries participating in UNFCCC are continuously putting efforts in reducing greenhouse gas after enforcing Kyoto Protocol into effect on Feb, 2005. Energy used in buildings, which relies heavily on fossil fuel accounts for about 24% of total energy consumption. In this study, air, geothermal and water source heat pump systems for an 322 ㎡ auditorium in an office building is simulated using TRNSYS version 17 for comparing energy consumptions. The results show that energy consumptions of air, geothermal and water source heat pumps are 14,485, 10,249, and 10,405 kWh, respectively. Annual equal payments which consider both initial and running costs become 5,734,521, 6,403,257 and 5,596,058 Won. Thus, water source heat pump is the best economical choice. Key words: EHP(Electric Heat Pump, 전기구동열펌프), GSHP(Ground source heat pump, 지열원열펌프), Dynamic simulation(동특성 시뮬레이션), WSHP(Water source heat pump, 수열원열펌프), Economic comparison(경제성 비교), TRNSYS(TRNSYS)