Comparison of parallel and counter flow coil absorber performance |
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| Affiliation: | 1. School of Engineering and Materials Science, Queen Mary University of London, Mile End Road, London E1 4NS, UK;2. MIRA Institute for Biomedical Technology and Technical Medicine, Department of Biomaterials Science and Technology, University of Twente, 7500 AE Enschede, The Netherlands;3. University Medical Center Groningen, W.J. Kolff Institute, Department of Biomedical Engineering, University of Groningen, 7600 AD Groningen, The Netherlands;4. Institute of Bioengineering, Queen Mary University of London, Mile End Road, London E1 4NS, UK;5. Nanoforce Technology Ltd., Joseph Priestley Building, Queen Mary University of London, Mile End Road, London E1 4NS, UK;1. Instituto de Energías Renovables, Universidad Nacional Autónoma de México, Temixco, Morelos, México;2. Universidad Autónoma de San Luis Potosí (UASLP), S.L.P, Mexico;1. Pharmaceutical Institute, Nanjing University of Chinese Medicine, Nanjing 210023, China;2. Engineering Center of State Ministry of Education for Standardization of Chinese Medicine Processing, Nanjing 210023, China;1. School of Mechanical and Power Engineering, Nanjing Tech University, JiangSu Province, China;2. Jiangsu Key Engineering Laboratory of Process Industrial Energy Conservation and Environmental Protection Technology and Equipment, JiangSu Province, China;3. Jiangsu Key Laboratory of Process Enhancement & Energy Equipment Technology, JiangSu Province, China;4. School of Mechanical and Power Engineering, East China University of Science and Technology, ShangHai, China |
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| Abstract: | This study concentrates on the absorber used in the vapor absorption systems using water–lithium bromide solution with water as the refrigerant and investigates the simultaneously occurred heat and mass transfer during the absorption process. The heat and mass transfer equations were applied to simulate this process and solved using a computer program written in Delphi 7 for the parallel and counter flow absorbers. The simulation results were compared with the results of the past studies. The solution and cooling water temperatures, the overall heat transfer coefficient, the heat transferred and the mass absorbed were calculated for the parallel and counter flow absorbers. It is concluded that the counter flow absorber presents better performance for all conditions. For smaller number of coils, the difference is smaller, however if the number of coils is bigger, the counter flow absorber presents much better performance than the parallel flow absorber. When the number of coils is 20 and 120, the counter flow absorber provides 1.7% and 26% higher heat and mass transfer than the parallel flow absorber respectively. |
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