Abstract: Based on the lump parameter models developed in this paper, general transfer functions for transient responses of fluid outlet temperatures of two - stream plate - fin heat exchanger to changes of either cold fluid inlet temperature or cold fluid flow are derived. The models have been verified by experiments. Detailed analyses show that applicable linearized ranges for transfer functions are unlimited for fluid temperature changes, or △m/m < 30% for fluid flow changes. When both fluid temperature and mass flow change simultaneously, the applicable linearized ranges are limited to their 20 percent changes of these two parameters.

摘要： 从集中热容模型出发,导出了两股流板翅式换热器流体出口温度对冷流体进口温度(或流量)扰动的传递函数,实验结果证实了其正确性。详细的分析表明,传递函数适用的线性区域,不受温度变化限制,对流量变化要求为Δm/m<30％。两者叠加以后,线性区域限于两者的变化量均在20％之内。