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In this study, the problem of a parallel connected power and absorption cooling cogeneration system was analyzed and then an improved configuration based on this system was proposed. This system can make cascade utilization of the turbine exhaust heat. By varying turbine outlet pressure, different turbine exhaust vapor temperatures can be obtained, resulting in different amounts of heat that can be recovered in the refrigeration subsystem. Simulation results show that when the turbine outlet pressure in the improved system is 3 bar, 119.6 kW of heat can be recovered in the refrigeration subsystem, and the total equivalent power output of the improved system is 17.6% higher than that of the original system. The corresponding equivalent heat-to-power efficiency and thermal energy saving ratio are increased from 16.1% to 18.9% and 6.6% to 26.5%, respectively. When the turbine outlet pressure increases from 1.6 bar to 4 bar, the cooling output increases rapidly, resulting in better performance, and the ratio of power to cooling is in a wide range of 0.19 to 1. When the turbine outlet pressure is higher than 4 bar, the favorable effect on refrigeration cannot compensate for the adverse effect on power generation, leading to the performance reduction. This study provides a new method for high efficiency utilization of waste heat.Copyright © 2013 by ASME

Investigation of an Ammonia–Water Based Power/Cooling Cogeneration System Using Sensible Waste Heat