Effects of high temperature generator pressure on energetic and exergetic performance of double effect series flow type absorption cooling system

Yilmazoglu M. Z.

Journal of the Energy Institute, vol.86, no.1, pp.32-40, 2013 (SCI-Expanded) identifier identifier


In this paper, energy and exergy analyses are carried out for a double effect series flow type absorption cooling system with different high temperature generator (HTG) pressures. In the cases, the pressure of HTG is selected as 100, 70 and 50 kPa respectively. Thermal loads of each component, mass flowrates of each stream, coefficient of performance (COP), exergy destruction of each component and second law efficiency are calculated, and the results are compared for a 1 kg s-1 coolant, where LiBr-H 2O is chosen as the working fluid pair. In increasing the pressure of HTG, the COP increases. At the same time, the exergy efficiency and the mass flowrate of steam, which are necessary to drive the cooling system, decrease. The COP and the second law efficiency are calculated as 1.215 and 9.5% for 100 kPa HTG pressure. Exergy destruction ratio, exergy loss ratio and exergy improvement potential of the system components are calculated. The highest irreversibility is found in the absorber, and the exergy improvement potential is the highest in the evaporator. © 2013 Energy Institute.