Limits of double-flow heat exchange and optimization of systems

Conditions for the minimum irreversibility of double-fl ow heat exchange have been obtained for various forms of kinetics. It has been shown that the obtained relations yield the realizability limits of the process; relations to calculate this limit have been derived. An algorithm to synthesize a double-fl ow heat exchanger with a minimum heattransfer coeffi cient at an assigned heat load has been proposed, which holds true for any heat-exchange kinetics. It has been shown that the obtained results make it possible to distribute heat loads and heat-transfer coeffi cients between double-fl ow heat exchangers in an arbitrary system for which the overall entropy production or the overall heat-transfer coeffi cient are minimum.
Conditions for the minimum irreversibility of double-fl ow heat exchange have been obtained for various forms of kinetics. It has been shown that the obtained relations yield the realizability limits of the process; relations to calculate this limit have been derived. An algorithm to synthesize a double-fl ow heat exchanger with a minimum heattransfer coeffi cient at an assigned heat load has been proposed, which holds true for any heat-exchange kinetics. It has been shown that the obtained results make it possible to distribute heat loads and heat-transfer coeffi cients between double-fl ow heat exchangers in an arbitrary system for which the overall entropy production or the overall heat-transfer coeffi cient are minimum.
Author:  A. M. Tsirlin, L. G. Gagarina
Keywords:  double-fl ow heat exchange, heat-transfer coeffi cient, heat load, entropy
Page:  263-263