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하수 슬러지 폐열원을 이용한 재생 에너지의 경제성 평가
이종호(Jong Ho Lee),박승상(Shung Sang Park),백종현(Jong Hyeon Peck),이수양(Soo Yang Lee),김봉진(Bong Jin Gim) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
In this study, economic evaluation of the waste heat recovery system combined with heat exchanger and the high temperature heat pump was suggested and investigated. It was designed that the system used the heat of wastewater from sludge-drying process. Based on the annual heat production of the system, bunker-C oil boiler and LNG boiler of the same capacity are compared, respectively. As a result, when the system operates for 15 years, payback period of this system predicts about 2.6~3.2 years in bunker-C oil boiler and about 2.7~3.4 years in LNG boiler, respectively.
김정열,정동열,박동호,백종현,Kim, Jeong-Yeol,Chung, Dong-Yeol,Park, Dongho,Peck, Jong-Hyeon 한국교통대학교 융복합기술연구소 2012 융ㆍ복합기술연구소 논문집 Vol.2 No.1
The cold chain system in South-East Asia is requiring to maintain freshness of refrigerated or frozen food. In this study, Thermal storage system using Phase change material (PCM) was developed and evaluated its performance about temperature and cold keeping time. For various application of cold chain system, we developed portable cold box, cold roll container and freezing station. Keeping time on laboratory tests of portable cold box in case of refrigeration and freezing were 6 hours and 4 hours, respectively. Cold container was developed to 2.5 ton scale. Evaluation in Indonesia, it was showed to keep the setting temperature of $-10^{\circ}C$ over 40 hours at $30^{\circ}C$ of ambient air. Freezing station using PCM was kept over 24 hours under $-20^{\circ}C$.