Abstract
The theory of liquid-coupled indirect heat exchanger systems has been studied to ascertain optimum criteria with respect to the coupling-liquid flow rate and the distribution of total heat transfer area between the hot-side and cold-side exchanger units in the case of counterflow arrangement. The optimum coupling-liquid capacity rate is derived and given as a function of the over-all capacity rate ratio and the Ntu ratio between the two exchanger units. For this optimum liquid capacity rate together with the proposed over-all number of transfer units, it is shown that the over-all heat transfer effectiveness of the liquid-coupled system can be expressed in the ordinary form for individual exchanger units in true counterflow.
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