Mathematical modelling of a LiBr–H2O absorption chiller including two-dimensional distributions of temperature and concentration fields for heat and mass exchangers |
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| Authors: | Krzysztof Banasiak Joachim Kozioł |
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| Affiliation: | 1. ISE, Thermal and Fluids Engineering Department, Universidad Carlos III de Madrid, Avda. Universidad 30, 28911 Leganés, Madrid, Spain;2. GTADS, Thermal and Fluids Engineering Department, Universidad Carlos III de Madrid, Avda. Universidad 30, 28911 Leganés, Madrid, Spain;1. School of Energy and Environment, Southeast University, Nanjing, China;2. Ministry of Education of Key Laboratory of Energy Thermal Conversion and Control, Southeast University, China;3. Jiangsu Provincial Key Laboratory of Solar Energy Science and Technology, Southeast University, Nanjing 210096, China;1. Faculty of Mechanical Engineering, University of Belgrade, Kraljice Marije 16, 11000 Belgrade, Serbia;2. Universitat Rovira i Virgili, CREVER, Av. Països Catalans 26, 43007 Tarragona, Spain |
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| Abstract: | The paper presents the results of a theoretical analysis performed for a single-stage, water–lithium bromide absorption chiller at steady-state conditions. The model takes into consideration crosscurrent flow of fluids for heat and mass exchangers, two-dimensional distribution of temperature and concentration fields, local values of heat and mass transfer coefficients, thermal-parameter-dependent physical properties of working fluids and operation limits due to the danger of the LiBr–water hydrates and ice crystallisation. The main practical advantage of the model is the possibility to assess the influence of both the geometry parameters and operation parameters on thermal performance of the absorption chiller. The results derived from the implementation of the water vapour absorption process model for a horizontal tube absorber are consistent with the experimental measurements found in the literature. |
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