Numerical Analysis and Optimization Research on Backflow Effect of Cooling Tower

Abstract

Cooling towers are generally arranged in a hidden area, since it is necessary to consider the appearance and space of the building, as well as to avoid the effects of running noise in the surroundings. In the project to take into account the layout of the cooling tower, which will affect the hot and humid air backflow, the cooling tower will increase the temperature and humidity, while deteriorating the surrounding micro-environment, directly affect the performance of the cooling tower. Cross-flow cooling tower air enters through the side of the tower, counter-flow cooling tower air enters through around the lower part of the tower. In this paper, the numerical simulation method is used to analyze the backflow of counter-flow and cross-flow cooling tower. By comparing the two air inlet temperature, this article judge the two tower backflow situation, and proposed optimization measures to reduce backflow. The simulation shows that the intake air temperature and return rate of the counter-flow are lower than those of the cross-flow, because the counter-flow arrangement makes the inlet airflow more uniform and the exhaust wind speed is large. As cross-flow air backflow of the situation is more serious, so done optimization for cross-flow cooling tower, including the outlet tube plus 15° upward louver and plus 2.2 meters air louver inlet, and simulation shows measures effectively reduce the backflow. The results can provide a reference for engineering design to reduce adverse design effects due to improper cooling tower design.