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CFD Analysis of the Influence of Ionic Liquids on the Performances of a refrigeration system

Fluid Dynamics & Materials Processing 2021年第6期17卷 1003-1013页

作者： Jianghao Niu Civil Aviation University of China Tianjin300300China

The falling film of an ionic liquid([EMIM][DMP]+H_(2)O)and its effect on a refrigeration system are numerically simulated in the framework of a Volume of Fluid(VOF)method(as available in the ANSYS Fluent computational platform).The properties of the liquid film and the wall shear stress(WSS)are compared with those obtained for a potassium bromide *** working conditions are *** is noted that the ionic liquid demonstrates a better absorption capability,with a coefficient of performance(COP)of *** is proved that the[EMIM][DMP]+H_(2)O ionic liquid working substance is superior to the potassium bromide solution in terms of heat and mass transfer.

关键词： Ionic liquid fluent simulation [EMIM][DMP]+H_(2)O absorption refrigeration system

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First and Second Law Analysis of a LiBr-Water absorption Cycle with Recovering Condensation Heat for Generation

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Frontiers in Heat and Mass Transfer 2024年第6期22卷 1719-1741页

作者： J.L.Rodríguez-Muñoz J.S.Pacheco-Cedeño J.F.Ituna-Yudonago J.J.Ramírez-Minguela I.J.González-Hernández Department of Mechanical Engineering Escuela Superior de Ciudad SahagúnUniversidad Autónoma del Estado de HidalgoCiudad SahagúnCarretera Cd.Sahagún-Otumba s/nZona IndustrialHidalgoC.P.43998México Departamento de Ingeniería en Aeronáutica Universidad Politécnica Metropolitana de HidalgoBoulevard Acceso a Tolcayuca 1009Ex Hacienda de San Javier TolcayucaHidalgoC.P.43860México Department of Chemical Engineering University of GuanajuatoDCNECol.Noria Alta s/nGuanajuatoGto.C.P.36050México Department of Industrial Engineering Escuela Superior de Ciudad SahagúnUniversidad Autónoma del Estado de HidalgoCiudad SahagúnHidalgoC.P.43998México

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 *** 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 *** 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 *** 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℃ to 30℃.However,when the evaporation temperature rose from 5℃ to 15℃,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℃ to 80℃.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 ***,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 *** 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

关键词： absorption refrigeration system recovery condensation heat energy and exergy analysis LiBr-H_(2)O

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