The heat transfer and flow resistance characteristics of snake like finned tubes of air cooling unit at low wind speed in winter

Abstract

Abstract:

Abstract:In winter, the ambient temperature is relatively low and the fan below the direct air cooling condenser is forced to run at low flow rate or shutdown in order to prevent the finned tube bundlesfrozen under low heat load conditions. Therefore, it is necessary to study the heat transfer and flow resistance characteristics of finned tubesat low wind speed, as well as the air cooling system status under natural ventilation
condition. This paper simulated the influence rules of ambient temperature, wall temperature of finned tubes and inlet velocity of air to the velocity and temperature fields of finned tubes using Fluent, and built a driving force generation model of airflow for direct air cooling condenser under natural ventilation condition. On the basis of numerical simulation, this paper analyzed the heat transfer and flow resistance characteristics of single row snakelikefinned tubes, obtained the natural ventilation air flow rate under certain condition through the balance of the lift and drag, and calculated the corresponding heat transfer coefficient. It provided a reference for the optimization design of direct aircooling condenserthat operating at low wind speed.

Key words: Keywords:air cooling unit, numerical simulation, snake like finned tubes, heat transfercharacteristic, flow resistance characteristic

ZOU Qingjiang1, LI Peng1, GUO Minchen2, LI Ansheng2. The heat transfer and flow resistance characteristics of snake like finned tubes of air cooling unit at low wind speed in winter[J]. Huadian Technology, 2016, 38(1): 13-17.

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The heat transfer and flow resistance characteristics of snake like finned tubes of air cooling unit at low wind speed in winter

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