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Gaseous fuel internal combustion engines (gas engines) for electric generating are important primary movers in distributed energy systems. However, the average thermal efficiency of the gas engine is just about 30%-40% and most of the waste heat is discharged by exhaust. So it is very meaningful to recover the exhaust waste heat. Electricity-cooling cogeneration system (ECCS) inclusive of a steam Rankine cycle (RC) and an absorption refrigeration cycle (ARC) is an effective way for recovering exhaust waste heat of gas engine. Partload performance analysis of ECCS is of great significance due to the frequently varied working conditions of gas engines in practical operation. In this paper, an off-design simulation model of ECCS is firstly established by Matlab. Then the effects of the engine working condition on the performance of ECCS are analyzed by this model.

The environmental issues combined with the rising of crude oil price have attracted more interest in waste heat recovery of marine engine. Currently, the thermal efficiency of marine diesels only reaches 48~51%, and the rest energy is rejected to the environment. Meanwhile, energy is required when generating electricity and cooling that are necessary for vessels. Hence, the cogeneration system is treated as the promising technology to conform the strict environment regulation while offering a high energy utilization ratio. In this paper, an electricity and cooling cogeneration system combined of Organic Rankine Cycle (ORC) and Absorption Refrigeration Cycle (ARC) is proposed to recover waste heat from marine engine. ORC is applied to recover exhaust waste heat to provide electricity while ARC is used to utilize condensation heat of ORC to produce additional cooling.