Thermoeconomic optimization of LiBr/H2O-R134a compression-absorption cascade refrigeration cycle

CİMŞİT C., ÖZTÜRK İ. T., KINCAY O.

APPLIED THERMAL ENGINEERING, vol.76, pp.105-115, 2015 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 76
  • Publication Date: 2015
  • Doi Number: 10.1016/j.applthermaleng.2014.10.094
  • Journal Name: APPLIED THERMAL ENGINEERING
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.105-115
  • Keywords: Thermodynamic, Thermoeconomic, Optimization, Refrigeration, Cascade, LITHIUM BROMIDE, EXERGY ANALYSIS, THERMODYNAMIC ANALYSIS, WATER, ENERGY
  • Kocaeli University Affiliated: Yes

Abstract

This study presents the thermoeconomic optimization of LiBr/H2O-R134a compression-absorption cascade refrigeration cycle. The detailed exergy-based thermoeconomic analyses, thermoeconomic evaluation with exergoeconomic variables, and thermoeconomic optimization by using non-linear simplex direct search method have been performed for the cascade refrigeration cycle. In the sample application, the thermoeconomic optimization reveals the optimum generator temperature, condenser temperature, absorber temperature, condenser temperature of vapour compression section, effectiveness of solution heat exchanger and compressor isentropic efficiency. This analysis points out that the evaporator equipage and solution heat exchanger should be designed carefully according to the exergoeconomic factor values. The exergetic efficiency and minimum cost of objective function are determined as 7.30% and 4.05 ($/h) for the optimum case of sample application. The minimum cost of objective function is reduced about 33%, the coefficient of performance (COPcyclegen) and exergetic efficiency of cascade cycle are improved about 7% and 3.1% respectively, according to the base case. (C) 2014 Elsevier Ltd. All rights reserved.