Transfer Behavior of Heat Exchanger
This study deals with the transient response of heat exchanger which is approximated to the first-order system with delay. This function is of simple form and easy to be applied to design the practical controllers. The parameters such as gain K, time constant T and delay time are derived in this paper. On the basis of using the first-order system as the transfer function for a heat exchanger, more accurate models are built to derive the parameters K, T and respectively, which are constructed with a lumped parameter approach. Unlike a number of recent analyses K is obtained by using arithmetic mean temperature difference, log mean temperature difference has been employed instead, which minimized the error; time constant T is obtained by deriving the time constant of baffle; delay time is estimated by flow rate. The result shows that this method to study the dynamic characteristics of heat exchanger is easier, more accurate.
Zhong Cao, Lixian Sun, Xueqiang Cao, Yinghe He
G. M. Cui et al., "Transfer Behavior of Heat Exchanger", Advanced Materials Research, Vols. 233-235, pp. 1281-1287, 2011