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산업폐수열원 이용 증기압축식/흡수식 하이브리드 히트펌프 시스템의 시뮬레이션
백영진,박성룡,장기창,라호상 대한설비공학회 2004 설비공학 논문집 Vol.16 No.12
In this study, in order to utilize the waste heat of industrial wastewater in the range of the relatively low temperature of 40∼50℃ as a heat source, a hybrid heat pump system was considered by computer simulation method. In the simulation, an absorber, desorber and solution heat exchanger were modelled by UA values while a compressor and pump performance were specified by an isentropic efficiency. Simulation results show that the performance of hybrid heat pump can be up to 80% higher than that of conventional R134a heat pump when it makes a process hot water of 90℃ while the wastewater is cooled down to 20℃. As the absorber pressure increases, the system performance and desorber pressure increase with a favorable effect of a compressor discharge gas temperature drop.
장기창,박성룡,이상남,라호상,박준택,함성원,박영태 한국에너지학회 2001 에너지공학 Vol.10 No.3
A great deal of energy is necessary with emission of lots of wastewater in dyeing and finishing process, but heat recovery from wastewater is not introduced since is technology is not developed yet. In order to obtain the method utilizing hot water produced by heat source, that is, dyeing wastewater it was investigated the characteristics of dyeing and finishing process and energy basic unit. Energy basic unit of polyester/cotton (T/C), polyester/rayon (T/R) and polyester dyeing process are higher than that of the other process. The average quantity of wastewater for each dyeing company is 20,470 ton/month, the average temperature of wastewater is about 41$^{\circ}C$. Because the SS solution of wastewater in polyester dyeing process is lower than that of the other process, the effect of corrosion in heat recovery system is low. Since the energy price for 1000 kcal produced by vapor compression heat pump is presumed to be 22.50 won, it is found to be very economic heat recovery system, and its payback is 2.09 years for the factory with LNG boiler. 염색가공공정은 에너지 다소비형이며, 염색조업을 수행하는 과정에서 약 4$0^{\circ}C$ 정도의 열원폐수를 다량으로 방출하고 있지만 이를 회수할 수 있는 기술개발이 이루어지지 않아서 아직 미활용되고 있다. 본 연구에서는 이와 같은 열원폐수의 열을 회수하여 이용할 수 있는 방안을 마련하기 위하여 먼저 염색공정의 특성을 고찰하고. 직물별, 공정별 에너지원단위를 조사한 결과 상대적으로 에너지원같위가 높은 T/C, T/R 교직물 업체나 폴리에스테르 염색업체에서 폐수열을 회수하여 이용하기에 적합한 것을 알 수 있다. 그리고 염색업체별, 계절별 폐수의 배출량과 온도를 조사한 결과 각 업체당 평균 폐수배출량은 20,470톤/월이고, 평균폐수온도는 41.$0^{\circ}C$로 나타났다 또한, 배관 침적, 폐쇄 등으로 폐열회수시스템의 안정적 운전이나 열교환기의 성능에 악영향을 끼칠 수 있는 SS의 경우 폴리에스테르 염색폐수가 가장 낮아 폴리에스테르 염색폐수가 폐열회수에 가장 유리할 것으로 판단되었다. 염색공장에서 기존에 사용하고 있는 시스템과 폐수열이용 시스템의 에너지단가를 비교해보면 폐열회수시스템에서 압축식 열펌프를 적용하면 에너지단가는 22.50원이 되어 매우 경제적이며, 증기생산을 위한 보일러 연료로 LNG를 사용하는 업체에 압축식 폐열회수시스템을 적용할 경우가 투자비 회수기간이 2.09년으로 경제성이 매우 우수한 것으로 나타나 열펌프시스템의 적용기술을 보급할 수 있는 기반을 마련하였다.
김종률(J. R. Kim),이영수(Y. S. Lee),장기창(K. C. Jang),라호상(H. S. Ra) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
The present study has been conducted to develop a heat pump system using river water of temperature energy which not only belongs to unutilized energy but is a kind of good heat source due to maintain its temperature in a certain degree regardless of seasonal variation. The system did n01 meet the proposed performance after setup. In this paper. the system performance affected by refrigerant Oil, by pressure drop, or by other factors has been discussed, The followings were obtained : (1) Refrigerant Oil mixture rete was 2.5 in weight percentage, (2) Pressure drop through evaporator was 29.1㎪(3.1℃ in saturated tempearture) (3) Pressure drop from the end of evaporator 10 compressor inlet was 39.8㎪(4.0℃ in saturated tempearture). (4) The system performance can to be improved by modifying a pan of pipe line to compressor, and reducing pressure drop through heat exchangers.
주거용 직접순환식 수직밀폐형 지열원 열펌프의 연간 운전성능 평가
김민성(Kim Min-sung),백영진(Baik Young-Jin),라호상(Ra Ho-Sang) 한국태양에너지학회 2012 한국태양에너지학회 논문집 Vol.32 No.3
Vertical closed-loop ground source heat pump systems(GSHP) have been installed widely in Korea since it can extract moderate temperature level of geothermal heat in a small area. As a ground heat exchanger, a vertical closed-loop type with brine circulation is mostly preferred since it is simple and less harmful to ground environment. However, it requires a secondary heat exchange loop between the refrigerant in a heat pump and the brine. By adding a geothermal heat exchanger in the secondary heat exchange loop. circulation pumps should be attached and the temperature difference between refrigerant and ground is increased, which are important parts of performance degradation. In this paper, annual and seasonal performances of direct expansion(DX) geothermal heat pump were estimated mathematically as an alternative of classical indirect geothermal heat pump based on the annual performance evaluation. As results, DX geothermal heat pump showed 43% higher annual performance than the classical U-tube geothermal heat pump.