Frontiers in Energy
>> 2010,
Volume 4,
Issue 3
doi:
10.1007/s11708-009-0067-0
Research articles
Air-side heat transfer and friction characteristics
of biofouled evaporator under wet conditions
School of Mechanical
Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;
Available online: 2010-09-05
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Abstract
The effects of biofouling on air-side heat transfer and friction characteristics under wet conditions of three biofouled finned tube heat exchangers and one clean finned tube heat exchanger were investigated experimentally. Experimental results indicate that the biofouled fin efficiency of the evaporator decreases by 15.5% compared with the clean evaporator under the condition of the biofouled area ratio of 60% at the inlet air velocity of 2.0m/s; The ranges of friction fouling factor and heat transfer fouling factor are 19.8%―43.1% and ―15.6%―13.1%, respectively; a small quantity of biofouled particles can enhance heat transfer at low Reynolds number, and the enhancement effect decreases with the increase of Reynolds number.
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