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We show in this paper that the common method of specifying ∆T min in design of heat exchanger systems may lead to wrong decisions and should be used with care. Although specifying ∆T min is reasonable for heat exchanger networks synthesis with given stream data, it should not generally be used for obtaining optimal design data -and especially not stream data (temperatures). An alternative simple TAC method is suggested and compared with the ∆T min -method on three vapour compression (refrigeration) cycle case studies.

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