Exergy Analysis of Inlet Air Absorption Cooling Effects on Basic Cogeneration Systems

Abstract

The use of the electrical energy is increasing in our life and in the world. The electrical energy is lost in the connection lines about 11%, as it is known. By producing the electrical and the heat energy in a cogeneration system to meet the needs, it can be obtained more efficiency in the use of fuel, and that can reduce energy costs. In a cogeneration cycle, by the absorption cooling system, the air entering into the compressor is cooled, and the cooling is obtained from energy of the heat of the exhaust gases. The system in this study is analyzed by using exergy analysis method and 1. and 2. laws of thermodynamics. Some of the heat energy is consumed to cool the air, in this cycle and the remaining heat is used to produce steam. The performance analysis of the whole cycle and also the devices that make up the cycle such as compressor, combustion chamber, turbine and heat exchanger were obtained and discussed. Also exergy losses, exergy efficiency and other performance parameters of the devices were obtained and discussed. The results showed that using absorption cooling (abc) system in a basic cycle made better than the basic one in electrical efficiency. However, because of the absorption cooling (abc) system the exergy efficiency is slightly less than the basic one. The absorption cooling (abc) cogeneration system can be used when the steam demand decreases or electrical demand increases for production more electricity.

Exergetic Analyses of Detonation Engine Cogeneration Plants

“…Needless equipment decreases the performance and advantages of the cycle. Also, Karaali and Keven, (2022) investigated four different cogeneration cycles' efficiencies, the effect of absorption cooling of inlet air of compressor and the effect of adding recuperators into these cycles, on the working conditions [12,13,14]. They found that absorption cooling by using waste heat can help to improve the efficiencies and the working conditions of the four cogeneration systems.…”