jaue2015033: Optimization of the cooling water distribution method for the indirect evaporative cooler in subway station

Abstract

Put forward a unique indirect evaporative cooler with rotary cooling water distribution device which is driven by a low-speed motor, to solve the installation location problem of the cooling tower in subway station. This study investigates the air parameters of the Guangzhou subway station's exhaust channel in summer and winter, optimizes the cooling water distribution method and the heat transfer performance of the indirect evaporative cooler. From the experimental results, the heat and wet source in the exhaust channel had little effect on the heat transfer ability of the air in the exhaust channel of Guangzhou Metro station, some of the station even developed to the direction that benefit for the heat exchange, therefore, moving the cooling tower into the exhaust channel of the subway station was feasible. From the orthogonal experiment results, it was found that the third arrangement mode of the heat exchanger was optimal; the water distribution device's best speed was 76 rpm, the heat transfer performance increased with the mass flow rate of the cooling water and hot water, the cooling water inlet temperature and the air velocity. The increase of the spray water temperature and the air temperature reduced the heat exchange performance, the cooling water inlet temperature change affected the heat exchange performance was the most significant, when the hot water temperature rise from 35℃ to 39℃, the heat transfer performance improved 37.62%.