入口气流方向对准逆流式全热交换器性能的影响

Influence of Inlet Air Flow Direction to the Performance of the Quasi-Counter Flow Total Heat Exchanger

通过合理假设,将气固(膜)两相间透湿类比为流固耦合传热,建立了空气-膜热湿耦合传递数学模型。利用现有CFD软件Flu-ent实现该数学模型的计算,通过实验,验证了该数学模型的正确性。保持风量不变,改变入口气流方向,计算了不同入口工况下换热器的性能参数。通过比较发现,当入口气流与迎风面夹角在75°附近时获得最佳性能。通过定义气流分布系数分析了入口气流方向对换热器性能影响的原因。

An analogy was drawn between fluid-solid（membrane ） coupled moisture transfer and fluid-solid coupled heat transfer by reasonable assumptions. A coupled moisture and heat transfer mathematic model was established between air and membrane. Then the model was implemented in the present CFD code Fluent, and verified by experimental works. Keeping the airflow rate as a constant, the perfonmmze parameters of the exchanger were calculated under various inlet airflow directions. It indicates that the best performance is obtained when the direction is between 75 degree and 90 degree. The reason was analyzed by defining the distribution coefftcient of airflow.