Exergy analysis of lithium bromide/water absorption systems

ŞENCAN ŞAHİN A., Yakut K. A., Kalogirou S. A.

Renewable Energy, vol.30, no.5, pp.645-657, 2005 (SCI-Expanded, Scopus) identifier

  • Publication Type: Article / Article
  • Volume: 30 Issue: 5
  • Publication Date: 2005
  • Doi Number: 10.1016/j.renene.2004.07.006
  • Journal Name: Renewable Energy
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.645-657
  • Keywords: Absorption heat pump, Absorption refrigerator, Exergy, Second law analysis
  • Isparta University of Applied Sciences Affiliated: No

Abstract

Exergy analysis of a single-effect lithium bromide/water absorption system for cooling and heating applications is presented in this paper. Exergy loss, enthalpy, entropy, temperature, mass flow rate and heat rate in each component of the system are evaluated. From the results obtained it can be concluded that the condenser and evaporator heat loads and exergy losses are less than those of the generator and absorber. This is due to the heat of mixing in the solution, which is not present in pure fluids. Furthermore, a simulation program is written and used for the determination of the coefficient of performance (COP) and exergetic efficiency of the absorption system under different operating conditions. The results show that the cooling and heating COP of the system increase slightly when increasing the heat source temperature. However, the exergetic efficiency of the system decreases when increasing the heat source temperature for both cooling and heating applications. © 2004 Elsevier Ltd. All rights reserved.