First and Second Law Analysis of a LiBr-Water Absorption Cycle with Recovering Condensation Heat for Generation
J. L. Rodríguez-Muñoz1,*, J. S. Pacheco-Cedeño1,*, J. F. Ituna-Yudonago2, J. J. Ramírez-Minguela3, I. J. González-Hernández4
1 Department of Mechanical Engineering, Escuela Superior de Ciudad Sahagún, Universidad Autónoma del Estado de Hidalgo, Ciudad Sahagún, Carretera Cd. Sahagún-Otumba s/n, Zona Industrial, Hidalgo, C.P. 43998, México
2 Departamento de Ingeniería en Aeronáutica, Universidad Politécnica Metropolitana de Hidalgo, Boulevard Acceso a Tolcayuca 1009, Ex Hacienda de San Javier Tolcayuca, Hidalgo, C.P. 43860, México
3 Department of Chemical Engineering, University of Guanajuato, DCNE, Col. Noria Alta s/n, Guanajuato, Gto., C.P. 36050, México
4 Department of Industrial Engineering, Escuela Superior de Ciudad Sahagún, Universidad Autónoma del Estado de Hidalgo, Ciudad Sahagún, Hidalgo, C.P. 43998, México
* Corresponding Author: J. L. Rodríguez-Muñoz. Email: ; J. S. Pacheco-Cedeño. Email:
(This article belongs to the Special Issue: Modeling, Control, and Optimization of Energy Modules and Systems)
Frontiers in Heat and Mass Transfer https://doi.org/10.32604/fhmt.2024.057924
Received 31 August 2024; Accepted 12 October 2024; Published online 28 October 2024
Abstract
In conventional absorption refrigeration systems (
ARS), the heat from the condenser is usually rejected by the environment in place to be used in the system, so recuperating this is a good alternative to enhance the system’s performance. For instance, in this paper, an alternative
ARS in which LiBr/Water is used as a refrigerant mixture, where part of condensing heat is recovered via the solution heat recovery generator absorption cycle (
HR-ARS) was energy and exergy evaluated. The influence of generator, condenser and evaporator temperatures, as well as the efficiency of the solution heat exchanger on the coefficient of performance, exergy performance and exergy destroyed of the
HR-ARS system, were analyzed and compared with the traditional ARS system at the same working conditions. The results showed an increase between 5.8%–6.3% on the
COP and 3.7%–9.5% in the exergy efficiency when condenser/absorber temperature was reduced from 40°C to 30°C. However, when the evaporation temperature rose from 5°C to 15°C, the
COP (coefficient of performance) increased by around 8%, although this could be increased by 2.3%–6.3% if the generator temperature decreases from 100°C to 80°C. Moreover, the
COP and exergetic performance for the
HR-ARS is more significant at the lowest generator, condenser and evaporator temperatures, as well as at high efficiency in the solution heat exchanger, in comparison to
ARS system. Furthermore, the
COP and exergy performance for the
HR-ARS system was improved by 2.57% to 3.11% and 0.22% to 0.7%, respectively, while the recovering condensation heat for generation is around 1.51%–3.76% lower than with the
ARS. It also was found that for all ranges of evaporator and condenser temperatures, the
COP for the
HR-ARS system is around 3% higher than that obtained with the
ARS at the three different generator temperatures here analyzed, while when the solution heat exchanger effectiveness was increased from 0.7–1.0, the total exergy destruction for the
HR-ARS resulted be 3.24%–5.01% smaller than the
ARS system. Finally, it can be concluded that the components with the most exergy destroyed in the systems (80% to 94%) are the generator and absorber.
Graphical Abstract
Keywords
Absorption refrigeration system; recovery condensation heat; energy and exergy analysis; LiBr-H
2O