<ol> <li>Assume a safety related counterflow heat exchanger that has a single ph

Question

<ol>
<li>Assume a safety related counterflow heat exchanger that has a single phase liquid on both the shell and tube sides, and a constant specific heat for each liquid.&#160; Under which of the following conditions does the heat transfer between the two liquids decrease measurably?</li>
</ol><ol>
<li>The flow rate of the hotter liquid is increased.</li>
<li>The flow rate of the cooler liquid is decreased.</li>
<li>The temperature of each liquid is increased.</li>
<li>The temperature of each liquid is decreased.</li>
</ol>

Explanation / Answer

Increasing the flow rate of the hot liquid would increase the heat transfer, though still limited by the flow rate of cold liquid carrying the heat away, it definitely wouldn't cause and less heat transfer.

Decreasing the flow rate of the cold liquid would definitely decrease heat transfer, as the cold liquid would be much more likely to closely match the hot liquids temperature before exiting, meaning further heat transfer would not happen since a temperature difference is necessary.

Increasing both temperatures, besides possibly changing fluid properties, would have no effect on heat transfer, as only the difference in temperatures matters.

Decreasing both temperatures, besides possibly changing fluid properties, would have no effect on heat transfer, as only the difference in temperatures matters.

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