NTU method

<p>The number of transfer units (NTU) method is used to calculate the rate of <a href="/facts/Heat_transfer/1IV3WbFL">heat transfer</a> in <a href="/facts/Heat_exchangers/CUzlMnBG">heat exchangers</a> (especially parallel flow, <a href="/facts/Countercurrent_exchange/MzFulDv1">counter current</a>, and cross-flow exchangers) when there is insufficient information to calculate the <a href="/facts/Log_mean_temperature_difference/e2maxDQ0">log mean temperature difference</a> (LMTD). Alternatively, this method is useful for determining the expected heat exchanger effectiveness from the known geometry. In heat exchanger analysis, if the fluid inlet and outlet temperatures are specified or can be determined by simple energy balance, the LMTD method can be used; but when these temperatures are not available either the NTU or the effectiveness NTU method is used.
</p><p>The effectiveness-NTU method is very useful for all the flow arrangements (besides parallel flow, cross flow, and counterflow ones) but the effectiveness of all other types must be obtained by a numerical solution of the partial differential equations and there is no analytical equation for LMTD or effectiveness.
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NTU method open-in-new

NTU method