A hot stream provides 2 kg/s at 200 C, with specific heat 3 kcal/kg C. A cold

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A hot stream provides 2 kg/s at 200 C, with specific heat 3 kcal/kg C. A cold stream is available at 30 οC and with specific heat of 2 kcal/kg οC. 

1. Determine the flowrate of the cold stream required to cool the hot stream to 100 οC. Determine the exergy efficiency of this heat exchange system. 

2. Repeat step 1 for a cold stream final temperature of 50 οC. 3. Explain the difference in the two exergy efficiencies.

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