Effects of biofouling on air-side heat transfer and pressure drop for finned tube heat exchangers |
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| Authors: | Hui Pu Guo-liang Ding Xiao-kui Ma Hai-tao Hu Yi-feng Gao |
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| Affiliation: | 1. Institute of Refrigeration and Cryogenics, Shanghai Jiaotong University, No. 800 Dongchuan Road, Shanghai 200240, China;2. International Copper Association Shanghai Office, 381 Huaihaizhong Road, Shanghai 200020, China;1. Postgraduate Metrology Programme, Catholic University of Rio de Janeiro, Brazil;2. Department of Mechanical Engineering, Catholic University of Rio de Janeiro, Rua Marquês de São Vicente 225, 22453-900 Rio de Janeiro, RJ, Brazil;3. Department of Mechanical Engineering, Centro Federal de Educação, CEFET/RJ, Rua Gal. Canabarro 485, 20271-110 Rio de Janeiro, Brazil;4. Light Energia S/A, Rua Marechal Câmera 168, 20080-002 Rio de Janeiro, RJ, Brazil;1. College of Energy and Power Engineering, Northeast Dianli University, Jilin, Jilin Province, China;2. College of Environmental and Energy Engineering, Beijing University of Technology, Beijing, China |
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| Abstract: | Experimental investigations on the effects of biofouling on air-side heat transfer and pressure drop for three biofouled finned tube heat exchangers and one clean finned tube heat exchanger were performed. Artificial accelerated method of microorganism growth on the fin surface was used for simulating the biofouled finned tube heat exchangers. Experimental results indicate that the effects of biofouling on the air-side heat transfer coefficient decreases 7.2% at 2.0 m/s when the biofouled area ratio is 10%, while it decreases 15.9% at 2.0 m/s when the biofouled area ratio is 60%, and biofouling causes a 21.8% ～ 41.3% increase in pressure drop when the air velocity is between 0.5 and 2.0 m/s. The increase of inlet air velocity is helpful to improve the long-term performance of finned tube heat exchanger. Biofouling makes the hydrophilic coating failure, and the condensation water easily converges on the fin surface where biofouling grows. |
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