冷库冷风机传热性能的实验研究

Experimental Investigation of Heat Transfer Coefficient of Air Cooler in Cold Storage

本文对冷风机稳定运行时的性能进行了实验研究,按照ASHRAE标准搭建了冷风机实验室,研究了冷风机的性能随库温、传热温差、循环倍率等因素的变化。结果表明:传热温差为10℃,循环倍率为3时,冷风机传热性能随库温的升高而提高,当库温从-34℃升至10℃时,传热系数由16 W/(m^(2)·℃)增至18.8 W/(m^(2)·℃),增幅达17.5%;循环倍率为3时,随着传热温差由6℃增至10℃,传热系数变化幅度较小,测试工况范围中的最大变化幅度为4.9%,库温为-25℃时,传热系数变化区间为16.8~17.63 W/(m^(2)·℃),库温为-10℃时,传热系数变化区间为18.1~18.43 W/(m^(2)·℃);随着循环倍率的升高,冷风机的传热系数随之升高。

This paper conducts an experimental study on the performance of the air cooler in stable operation.According to the ASHRAE standard,the air cooler test room was built,and the performance of the air cooler varies with factors such as the storage temperature,the driving temperature difference,and the ratio cycle was studied.The results show that when the driving temperature difference is 10℃and ratio cycle is 3,the heat transfer performance of the air cooler increases with the increase of the storage temperature.When the storage temperature increases from-34℃to 10℃the heat transfer coefficient increases from 16 W/(m^(2)·℃)to 18.8 W/(m^(2)·℃),with a percentage of 17.5%;When the cycle rate is 3,as the heat transfer temperature difference increases from 6℃to 10℃,the heat transfer coefficient changes in a small range,and the maximum change in the test range is 4.9%.When the storage temperature is-25℃,the heat transfer coefficient varies from 16.8 to 17.63 W/(m^(2)·℃),when the storage temperature is-10℃,the heat transfer coefficient varies from 18.1 to 18.43 W/(m^(2)·℃);with the increase of ratio cycle,the heat transfer coefficient increases accordingly.