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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.
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%.
열원조건 분석 통한 흡수식 히트펌프 적용 열에너지 네트워크의 에너지 절감 예측
나선익(Sun-Ik Na),이영수(Young-Soo Lee),백영진(Young-Jin Baik),이길봉(Gilbong Lee) 대한설비공학회 2017 설비공학 논문집 Vol.29 No.5
At the 21<SUP>st</SUP> Conference of the Parties (COP) of the United Nations Climate change Conference, representatives of the 195 member countries reached an agreement requiring all participating countries, including Korea, to establish proactive measures to fight climate change. Under this vision, energy network technologies are deemed as a key site of research towards meeting this goal. Herein, the headquarters of the Korea Institute of Energy Research (KIER) is a worthy site for carrying out energy network technology research insofar as it contains various heat sources. To prepare for this research, a study was conducted analyzing the heat sources at KIER based on measured data. The study also consisted of developeding simulation models to predict the amount of energy savings that could be derived by replacing an absorption chiller/heater with an absorption heat pump during winter seasons. In our simulation results, we observed a primary energy saving ratio of 65~72% based on the water temperature from the heat source of a coal power plant.
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.
예열기를 갖는 초임계 이산화탄소 동력 사이클의 시뮬레이션
나선익(Sun-Ik Na),백영진(Young-Jin Baik) 대한기계학회 2015 大韓機械學會論文集B Vol.39 No.10
초임계 이산화탄소(S-CO₂) 사이클은 소형화된 터보기계 및 열교환기를 통해서 작은 공간에서도 높은 열효율로 전력을 생산할 수 있는 잠재력을 가진 것으로 평가되고 있으며, 최근 이에 대한 관심이 증가하고 있다. 원자력 및 태양열(CSP) 분야에서 S-CO₂ 사이클에 대한 연구 결과가 다수 소개되어 온 반면, 폐열 분야에 대한 연구 결과는 상대적으로 많지 않다. 본 연구에서는 폐열 회수 응용 분야에 있어서, 예열에 의한 S-CO₂ 사이클의 성능 향상 가능성을 살피기 위하여, 재생 S-CO₂ 브레이튼 사이클과 예열기를 갖는 재생 S-CO₂ 브레이튼 사이클을 모델링하고 시뮬레이션 하였다. 시뮬레이션 결과, 순출력을 극대화시키는 최적 CO₂ 분기율이 존재함을 확인하였다. 본 연구의 시뮬레이션 조건 하에서, 예열기에 의한 순출력 향상은 약 16-26%로 계산되었다. In response to the growing interest in supercritical carbon dioxide (S-CO₂) power cycle technology because of its potential enhancement in compactness and efficiency, the S-CO₂ cycles have been studied intensively in the fields of nuclear power, concentrated solar power (CSP), and fossil fuel power generation. Despite this interest, there are relatively few studies on waste heat recovery applications. In this study, the S-CO₂ cycle that has a split flow with preheating was modeled and simulated. The variation in the power was investigated with respect to the changes in the value of a design parameter. Under the simulation conditions considered in this study, it was confirmed that the design parameter has an optimal value that can maximize the power in the S-CO₂ power cycle that has a split flow with preheating.