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이호생(Ho-Saeng Lee),정영권(Young-Kwon Jung),정동호(Dong-Ho Jung),문덕수(Deok-Soo Moon),김현주(Hyeon-Ju Kim) 대한조선학회 2011 대한조선학회 학술대회자료집 Vol.2011 No.6
The paper presents the analysis for cycle performance of ocean thermal energy conversion(OTEC) and seawater air-conditioning(SWAC) with deep ocean water and geothermal heat. The basic thermodynamic model for cycle is Rankine cycle and the geothermal water and deep seawater were adapted for the heat source of evaporator and condenser, respectively. The cycle performance such as gross power, sea water and geothermal water flow rate etc. was analyzed on the flowrate variation of deep seawater . The compressor work in case of seawater heat pump system showed 21.7% lower and the COP showed 19.8% higher than that of the existing air-cooled heat pump system when the deep seawater from OTEC is used for the heat source of SWAC.
이호생(Ho-Saeng Lee),진병주(Byoung-Ju Jin),윤정인(Jung-In Yoon),황준현(Jun-Hyeon Hwang),진심원(Sim-Won Jin),경익수(Ick-Soo Kyung),Donald C Erickson 대한설비공학회 2009 설비공학 논문집 Vol.21 No.8
Experimental results for performance characteristics of small H₃ absorption chiller/heater are presented. The apparatus consists of 7RT water-cooled absorption system, solution pump, boiler, cooling tower and peripheral devices. The effect of experimental parameters, such as refrigerant mass flow rate, solution mass flow rate and cooling water temperature have been investigated in view of the system performance. The capacity of each heat exchanger increased as refrigerant mass flow rate increased in cooling mode. Also, a cooling capacity increased as a strong solution mass flow rate increased. The cooling and heating COP show 0.5, 1.5 regardless of refrigerant mass flow rate, respectively. The results focus on the evaluation for performance characteristics of system with respect to variation of refrigerant mass flow rate under standard design conditions.
해수 히트펌프시스템을 이용한 냉동법 담수화시스템 성능해석
이호생(Ho-Saeng Lee),이승원(Seung-Won Lee),윤정인(Jung-In Yoon),김현주(Hyeon-Ju Kim) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.10
In this study, a freeze desalination cycle with seawater heat pump system is simulated and designed for the basic data for the design of freeze desalination system. The basic model of seawater heat pump system is refrigeration cycle and indirect freeze desalination method is used for seawater desalination. The cycle performance of seawater heat pump such as COP, compressor work, condensing capacity was analyzed and the desalination performance such as fresh water productivity and energy per unit fresh water productivity were compared with respect to the seawater temperature of condenser inlet and ice ratio in the evaporator. The compressor work and condensing capacity decreased with respect to the increase of seawater inlet temperature. The energy per unit fresh water productivity in case of 8℃ seawater inlet temperature showed 28.9% lower than that of 20℃.
이호생(Ho-Saeng Lee),정동호(Dong-Ho Jung),문덕수(Deok-Soo Moon),이승원(Seong-Won Lee),김현주(Hyeon-Ju Kim) 한국해양환경·에너지학회 2010 한국해양환경공학회 학술대회논문집 Vol.2010 No.6
The thermodynamic performance of geothermal power generation cycle with 1 kg/s geothermal water flow rate was evaluated to obtain the basic data for the optimal design of cycle. The basic thermodynamic model for cycle is Rankine cycle and the geothermal water and deep seawater was adapted for the heat source of evaporator and condenser, respectively. R-245fa is used as the working fluid. Net power showed the highest value when the evaporating pressure is around 300 kPa under given conditions. The cycle efficiency and net power increased when generator is added with 0.9 generator effectiveness. According to the increase of geothermal water temperature and decrease of cooling water temperature, the cycle efficiency increased. Especially, the net power showed higher values when deep seawater below 5 ℃ is used as a cooling water.
이호생(Ho-Saeng Lee),정동호(Dong-Ho Jung),홍석원(Seok-Won Hong),김현주(Hyeon-Ju Kim) 한국해양공학회 2011 韓國海洋工學會誌 Vol.25 No.1
The cycle performance of closed ocean thermal energy conversion (OTEC) system with 50 ㎾ gross power was evaluated to obtain the basic data for the optimal design of OTEC using waste heat such as solar power, discharged heat from condenser of power plant. The basic thermodynamic model for OTEC is Rankine cycle, and the surface seawater and deep seawater were used for the heat source of evaporator and condenser, respectively. The cycle performance such as efficiency, heat exchanger capacity, etc. was analyzed on the variation of temperature increase by waste heat. The cycle efficiency increased and necessary capacity of evaporator and condenser decreased under 50㎾ gross power with respect to the temperature increase of working fluid. Also, when the temperature increase is about 13.5℃, the heat which can be used is generated. By generator with 0.9 effectiveness under the simulated condition, the cycle efficiency was improved approximately 3.0% comparing with the basic cycle.
60RT급 해수냉난방시스템의 성능특성에 관한 실험적 연구
이호생(Ho-Saeng Lee),정동호(Dong-Ho Jung),김현주(Hyeon-Ju Kim) 대한조선학회 2012 대한조선학회 학술대회자료집 Vol.2012 No.5
This study experimented on a heating and cooling system that uses the deep ocean water as a heat source in a laboratory equipped with the water intake system. Experiments on direct cooling using the deep ocean water of yearlong temperatures at 5 oC or less were performed. Experiments on heating using a heat pump system were performed with various ocean waters as heat sources including the deep ocean water at 5 oC, the surface ocean water at 10 oC, and the ground ocean water at 13 oC, among others. The comparison results between the conventional cooling systems and the direct cooling system using the deep ocean water revealed that the latter saved approximately 75.6% of the TOE and reduced the carbon dioxide exhaust by about 1.45 tCO2. The heating COPs of the surface ocean water and the ground ocean water increased by approximately 2.9% and 8.4% more, espectively, than that of the deep ocean water.