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GATE BT 2024 | Question: 44

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Fermentation medium is cooled from $121^{\circ} \mathrm{C}$ to $30{ }^{\circ} \mathrm{C}$ in a double pipe heat exchanger. If cold water is flowing in the counter-current direction and is heated from $10^{\circ} \mathrm{C}$ to $70{ }^{\circ} \mathrm{C}$, then the Log-Mean Temperature Difference (LMTD) is $\_\_\_\_\_\_\_$ ${ }^{\circ} \mathrm{C}$ (rounded off to the nearest integer).
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