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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.

Performance Analysis of a Combined Power Cycle Utilizing Low-Temperature Heat Source and LNG Cold Energy