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摘要
The organization of heat transfer processes can enhance the heat transfer.Up to now,studies about the heat transfer process organization are all based on the uniformity principle of the temperature difference field.It can be mathematically proved by deducing the minimum entransy dissipation with given heat exchange amount,or by deducing the maximum heat exchange amount with given entransy dissipation.However,in many multi-stream heat transfer process,the process requires all hot streams be cooled to proper temperature,and meanwhile cold streams be heated to proper temperature.Therefore,the deducing objectives above are not adaptive.Based on the process requirements,this paper analyzed the principle of temperature difference field for multi-stream one-dimensional heat transfer process.With given entransy dissipation,the minimum heat exchange area requirement was deduced.The result shows that,with the process requirements,keeping (√)KΔt uniform,the heat transfer process among one cold stream and multi hot streams (or one hot stream and multi cold streams) shows the best performance,rather than keeping the temperature difference ( Δt ) uniform.Moreover,the conclusion was verified by a three-stream heat transfer example at last of this paper.
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