Theoretical Analysis of Annular Elliptic Finned Tube Evaporative Condenser Based on Field Measurement

Abstract

In this article, a new evaporative condenser with an annular elliptic finned tube heat exchanger that includes a round inner tube and elliptic outer finned tube was designed and analyzed. The refrigerant flows between the round inner tube and the elliptic outer tube, and it simultaneously exchanges heat with the cooling water in the inner tube, the spray water, and the cooling air flowing past the outer tube. Using field measurement for the traditional round finned tube evaporative condenser in the Futong Metro Station of Line 14 in Beijing, China, the theoretical heat transfer performance of the annular elliptic finned tube evaporative condenser was analyzed and simulated. Compared with a round finned tube heat exchanger, the heat exchange capacity of the annular elliptic finned tube increased by 2.34% to 9.28%; the total heat transfer coefficient increased by 47.42%, and the power consumption of the fan in the air-conditioning system with an annular elliptic finned tube heat exchanger decreased by 11.18% to 14.65%. Therefore, the energy-saving performance and the heat transfer performance of the new annular elliptic finned tube heat exchanger were enhanced compared to the round finned tube heat exchanger.