Research and Optimization of Air Side Heat Transfer Characteristics of AirCooled Condenser with Variable Diameter Tube

Abstract:

In view of the freeze due to the uneven heat transfer of the fourrowtube direct aircooled condenser, the idea of using variable diameter finnedtube bundles was put forward. Using the method of computational fluid dynamics (CFD), the numerical simulation of heat transfer characteristics of a variable diameter finnedtube bundles was conducted. It is found that the comprehensive performance and heat transfer uniformity of variable diameter finnedtube bundles are improved compared with the equivalent diameter finnedtube bundles. At the same time, in order to improve the poor thermal performance of this type of heat exchanger, the condenser performance increases but heat transfer uniformity does not change significantly when finnedtube bundles changes from nearly equilateral arrangement to nearly isokinetic arrangement. Moreover, the comprehensive performance of aircooled condenser is further improved and the sensitivity of heat transfer uniformity to Reynolds number changes after the addition of vortex generator.

Key words:variable diameter finnedtube; heat transfer uniformity; comprehensive performance; nearly isokinetic arrangement; vortex generator