Answer to Question #227670 in Chemical Engineering for Lokika

Question #227670

Comparing the flow arrangement in a heat exchnager, LMTD in parallel flow is (greater than/less than/equal to) LMTD in counter-flow?


1
Expert's answer
2021-08-23T04:48:33-0400

less than


For counter flow HEX: the temperature difference between the hot & cold fluids is relatively constant across the HEX ( from inlet to outlet ) . which means that the rate of heat transfer is constant across the HEX pass.


For Parallel flow HEX: the temperature difference is high at the HEX inlet while it decrease gradually across the HEX pass. which mean the rate of heat transfer decrease through the HEX.


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