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공기식 태양광열기 활용 공기열원 히트펌프 시스템의 성능개선 시뮬레이션 연구
나선익(Sun-Ik Na),강은철(Eun-Chul Kang),이의준(Euy-Joon Lee) 대한설비공학회 2013 대한설비공학회 학술발표대회논문집 Vol.2013 No.6
Major portion of heat pumps in market are AAHP(air to air heat pump) system while the lower seasonal system efficiencies than expected have been a major barrier to disseminate them more widely. This paper has introduced a genuine technology of PVT(Photovoltaic/Thermal) coupled AAHP to improve the heating capacity and COP by introducing the warm air from the PVT system. A test cell was developed in KIER to justify the TRNSYS SET (Separate Effect Test) model. The SET simulation model indicated that the COP could be improved up to 13.56%. by this PVT air coupled heat pump technology.
서브쿨링 사이클을 적용한 CO₂ 냉방 사이클 시뮬레이션
나선익(Sun-Ik Na),강구황(Gu Hwang Kang),김민수(Min Soo Kim) 대한설비공학회 2018 대한설비공학회 학술발표대회논문집 Vol.2018 No.11
To enhance the coefficient of performance (COP) of cooling systems using CO₂ as the refrigerant, a subcooling cycle is introduced in this study. The performance of conventional CO₂ cooling systems is strongly depended on the state of gas cooler outlet. When the temperature of gas cooler outlet is much higher than critical point of CO₂, it is hard to have proper cooling capacity due to the quality of the CO₂ evaporator inlet is larger and the enthalpy difference between inlet and outlet of the evaporator is smaller. Thereby the CO₂ cycle has had weak point and hard to achieve cooling capacity when outdoor temperature over the 35℃. In this study, the simulation model is constructed about the CO₂ cooling system which has a subcooling system. And then analysis of the system according to the outlet temperature of the CO₂ gas cooler and hydrocarbon refrigerants such as propane(R290) or iso-butane(R600a). The system COP of the suggested system presents higher than the conventional CO₂ cooling system whenever outlet temperature of the gas cooler is changed. And the maximum COP was calculated when the relative ratio between the CO₂ mass flow rate in the main cycle and the hydrocarbon mass flow rate in the subcooling cycle is optimal.
연료전지 지열히트펌프 마이크로제너레이션 IEA ECBCS Annex 54 경제성 평가 연구
나선익(Sun-Ik Na),강은철(Eun-Chul Kang),이의준(Euy-Joon Lee) 대한설비공학회 2014 설비공학 논문집 Vol.26 No.5
The integration of FC (Fuel Cell) and GSHP (Ground Source Heat Pump) hybrid system could produce a synergistic advantage in thermal and electric way. This study intends to analyse the economical aspect of a FC integrated GSHP hybrid system compared to the conventional system which is consisted with a boiler and a chiller. Based on the hourly simulation, the study indicated that GSHP system and FC+GSHP hybrid system could reduce the energy consumption on a building. The method of the economic assessment has been based on IEA ECBCS Annex 54 Subtask C SPB(Simple Payback) method. The SPB was calculated using the economic balanced year of the alternative system over the conventional (reference) system. The SPB of the alternative systems (GSHP and FC+GSHP) with 50% initial incentive was 4.06 and 26.73 year respectively while the SPB without initial incentive of systems was 10.71 and 57.76 year.
EES를 이용한 공기열원 히트펌프 시뮬레이션 모델 연구
나선익(Sun-Ik Na),강은철(Eun-Chul Kang),이의준(Euy-Joon Lee) 대한설비공학회 2012 대한설비공학회 학술발표대회논문집 Vol.2012 No.6
EES computer simulation for the performance prediction of an air to air heat pump system is carried out for the design and heat pump design operating conditions. To estimate the performance for other conditions, the heat pump has been model based on the manufacture data. The simulation model has been developed from the experiment measured data in KIER. The simulation model predicted the condenser outlet air temperature, power, consumption and COPc as 2.64%, 1.63%, and 4.68%.
나선익(Sun-Ik Na),강은철(Eun-Chul Kang),이의준(Euy-Joon Lee) 한국지열·수열에너지학회 2014 한국지열에너지학회논문집 Vol.10 No.1
This study intends to analyse the economical aspect of a GSHP(Ground Source Heat Pump) system compared to the conventional system which is consisted with a boiler and a chiller. This study has simulated four systems in Incheon. It developed and analyzed for applications in a residential and an office building which was based on the hourly EPI(Energy Performance Index, kWh/m²yr). Case 1 is utilizing a boiler and a chiller to meet heating and cooling demand of a house. Case 2 is utilizing the same conventional set up as Case 1 of a office. Case 3 is summation of Case 1 (house) and 2(office) systems and loads. And Case 4 is utilizing a GSHP to meet the combined loads of the house and office. The method of the economic assessment has been based on IEA ECBCS Annex 54 Subtask-C SPB(Simple Payback) method. The SPB calculated the economic balanced year of the alternative system over the reference system. The SPB of the alternative systems (GSHP) with 10%, 30% and 50% initial incentive has been calculated as 9.38, 6.72 and 4.06 year respectively while the SPB without the SPB without initial incentive of systems was 10.71 year.