저온 열원 및 LNG 냉열을 이용하는 복합 발전 사이클의 성능 해석 = Performance Analysis of a Combined Power Cycle Utilizing Low-Temperature Heat Source and LNG Cold Energy

다국어 초록 (Multilingual Abstract)

Power generation cycle using ammonia-water mixture as working fluid has attracted much attention because of its ability to efficiently convert low-temperature heat source into useful work. If an ammonia-water power cycle is combined with a power cycle using liquefied natural gas (LNG), the conversion efficiency could be further improved owing to the cold energy of LNG at -162. In this work parametric study is carried out on the thermodynamic performance of a power cycle consisted of an ammonia-water Rankine cycle as an upper cycle and a LNG cycle as a bottom cycle. As a driving energy the combined cycle utilizes a low-temperature heat source in the form of sensible heat. The effects on the system performance of the system parameters such as ammonia concentration (), turbine 1 inlet pressure () and temperature (), and condenser outlet temperature () are extensively investigated. Calculation results show that thermal efficiency increases with the increase of , and the decrease of , while its dependence on has a downward convex shape. The changes of net work generation with respect to , ,, and are roughly linear.

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