Exergoeconomic Performance Comparison and Optimization of Single-Stage Absorption Heat Transformers

Abstract

Three single-stage absorption heat transformer (SSHT) configurations are modeled, analyzed and compared from the viewpoints of thermodynamics and economics, using the Engineering Equation Solver (EES) software. In addition, a multi-objective optimization is carried out for the three configurations to specify the optimal design point considering the second law efficiency and the product unit cost as two objective functions. The configurations differ from one another considering the number of heat exchangers used in them. The results show that the coefficient of performance (COP) and exergy coefficient of performance (ECOP) for configuration 3 are around 35% and 30% higher than the corresponding values for configuration 1, respectively. Also, configuration 2 is found to be more economic with a product unit cost of about 21% and 5% lower than those for configurations 1 and 3, respectively. Furthermore, it is observed that relatively higher absorber temperatures can be achieved by configurations 2 and 3 compared to configuration 1. It is concluded from the multi-objective optimization that the conditions at which the evaporator, condenser and absorber temperatures are 86.51 • C, 39.03 • C and 123.1 • C, respectively, represents an optimal solution.

On the Dimensionless Absorption Heat Pump Widespread

“…The shown non-linear data correlate the diminished COP as function of the condenser temperature, which is the lower temperature of the thermodynamic cycle. This is in agreement with several papers for AHT [25][26][27][28][29][30][31][32][33][34][35][36] with consistent typical decreasing shape. For the same data, shown in Figure 5, the flow ratio as a function of thermal efficiency is observed as an asymptotic tendency for a lower FR value while thermal efficiency increases.…”

Exergoeconomic Assessment of a Compact Electricity-Cooling Cogeneration Unit

“…Kerdan et al [47] developed an exergoeconomic-based parametric study to examine the effects of active and passive energy retrofit strategies for buildings. Fathia et al [48] carried out a SPECO-based optimization for the equipment of a desalination unit used in an industrial steam production plant in Tunisia, and Mahmoudi et al [49] optimized the heat exchangers of a single-effect LiBr-H 2 O absorption refrigeration system. Among different cogeneration systems, those producing cooling and power have been the focus of more recent investigations, mainly when low-grade heat is employed as a heat source [50][51][52][53][54][55][56][57][58].…”

Performance analysis of a single stage absorption heat transformer-based desalination system employing a new working pair of (EMIM) (DMP)/H2O

“…The pressure loss inside of the components is ignored A proper value is considered for the effectiveness of the heat exchanger The refrigerant is considered to be as saturated vapor and saturated liquid at the outlets of evaporator and condenser, respectively …”