A discretization method for the characterization of a plate heat exchanger working as evaporator during transient conditions
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AuthorIllán Gómez, Fernando; García Cascales, José Ramón; Molina Valverde, Rafael; Sánchez Velasco, Francisco Javier
Knowledge AreaTecnología Electrónica
SponsorsThe work in this paper has been financed by the Spanish Ministry of Science and Innovation under Project TED2021-131173B–I00 and the NextGenerationEU recovery plan.
Realizado en/conUniversidad Politécnica de Cartagena
Bibliographic CitationF. Illán-Gómez, J.R. García-Cascales, R. Molina-Valverde, F.J.S. Velasco, A discretization method for the characterization of a plate heat exchanger working as evaporator during transient conditions, International Journal of Thermal Sciences, Volume 184, 2023, 107998, ISSN 1290-0729, https://doi.org/10.1016/j.ijthermalsci.2022.107998.
KeywordsHeat exchangers model
Plate heat exchangers
In this work, a method for the characterization of a plate heat exchanger working as evaporator is presented. It is based on a one-dimensional discretization of the exchanger, which solves the heat transfer balance equations by means of an iterative methodology based on a heat transfer area converging method. The inputs of the method are the flow rates of the fluids, the inlet enthalpy of the refrigerant, the superheating, and the inlet temperature and pressure of the secondary fluid. Once the inlet pressure of the refrigerant is assumed, pressure drop is calculated in each cell and then enthalpy. The consideration of the proper heat transfer coefficient (HTC) correlations allows the calculation of the heat transfer area, which is after compared to the actual one. The method has been validated by means of a database of 366 experimental data obtained for eight plate heat exchangers working as evaporators by using six different refrigerants, namely R134a, R1234yf, R513A, R744, R290, and ...
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