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     EduGorilla 
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    Oil at 120°C is used to heat water at 30°C in a 1 – 1 co – current shell and tube heat exchanger. The available heat exchange area is S1. The exit temperatures of the oil and the water streams are 90°C and 60°C respectively. The co-current heat exchanger is replaced by a 1 – 1 counter-current heat exchanger having heat exchange area S2. If the exit temperatures and the overall heat transfer coefficients are same, the ratio of S1 to S2 is

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