A mathematical model with experiments of single effect absorption heat pump using LiBr–H2O |
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| Authors: | Jian Sun Lin Fu Shigang Zhang Wei Hou |
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| Affiliation: | 1. School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing;2. School of Building Science, Tsinghua University, Beijing;1. Federal Institute of Technology of Pernambuco, Av. Prof Luiz Freire, 500, CEP: 50740-540, Recife, PE, Brazil;2. Federal University of Pernambuco, Av. Prof. Moraes Rego, 123, CEP 50670-901, Recife, PE, Brazil;3. Federal University of Paraiba, cidade universitaria, s/n, CEP: 58051-900, João Pessoa, PB, Brazil;1. Universidad Carlos III de Madrid, Avda de la Universidad 30, 28911, Leganés, Madrid, Spain;2. Instituto C.C Eduardo Torroja (CSIC), c/ Serrano Galvache 4, 28033 Madrid, Spain;3. Escuela Técnica Superior Ingeniería Industrial, UNED, c/ Juan del Rosal 12, 28040 Madrid, Spain;4. Universidad Politécnica de Madrid, c/ Ronda de Valencia 3, 28012 Madrid, Spain;1. Key Laboratory of Advanced Energy and Power, Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China;2. Research Center for Clean Energy and Power, Chinese Academy of Sciences, Lianyungang, Jiangsu 222069, China;3. University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | A mathematical model of a single effect, LiBr–H2O absorption heat pump operated at steady conditions is presented. This model took into consideration of 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 aqueous solution hydrates and crystallization. Improvements of the calculation method make this simulation much more convenient and efficient. An improved absorber experiment set-up and a complete absorption heat pump were built and tested for further study. It was found that the mass flux of vapor increased with the increase of absorber pressure, coolant flow rate, spray density of LiBr solution and decrease of coolant and input temperature of solution. And the vapor mass flux increased almost linearly with the increase of absorber pressure. Results derived from this model show agreement within 7% with experimental values. |
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