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Hot oil at \( 110^\circ \)C heats water from \( 30^\circ \)C to \( 70^\circ \)C in a counter-current double-pipe heat exchanger. The flow rates of water and oil are \( 50 \) kgmin\(^{-1}\) and \( 100 \) kgmin\(^{-1}\), respectively, and their specific heat capacities are \( 4.2 \) kJ kg\(^{-1}\)°C\(^{-1}\) and \( 2.0 \) kJ kg\(^{-1}\)°C\(^{-1}\), respectively. Assume the heat exchanger is at steady state. If the overall heat transfer coefficient is \( 200 \) W m\(^{-2}\)°C\(^{-1}\), the heat transfer area \( A \) in m\(^{2}\) is:
Hot oil at \( 110^\circ \)C heats water from \( 30^\circ \)C to \( 70^\circ \)C in a counter-current double-pipe heat exchanger. The flow rates of water and oil are \( 50 \) kgmin\(^{-1}\) and \( 100 \) kgmin\(^{-1}\), respectively, and their specific heat capacities are \( 4.2 \) kJ kg\(^{-1}\)°C\(^{-1}\) and \( 2.0 \) kJ kg\(^{-1}\)°C\(^{-1}\), respectively. Assume the heat exchanger is at steady state. If the overall heat transfer coefficient is \( 200 \) W m\(^{-2}\)°C\(^{-1}\), the heat transfer area \( A \) in m\(^{2}\) is:
Updated On: Jul 17, 2024
- 17.9
- 1.1
- 5.2
- 35.2
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The correct option is (A):17.9
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