Name: Page 9 5. Oil enters a heat exchanger at 150°C while cooling water enters at 30°C. In parallel-flow operation the

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Name Page 9 5 Oil Enters A Heat Exchanger At 150 C While Cooling Water Enters At 30 C In Parallel Flow Operation The 1 (39.19 KiB) Viewed 29 times

Name: Page 9 5. Oil enters a heat exchanger at 150°C while cooling water enters at 30°C. In parallel-flow operation the exit temperatures of oil and water are 80°C and 65°C respectively. Hint: Several significant parameters needed for the equations below can be deduced from these four temperatures. Use these for parts 1 and 2. If the flow rates and inlet conditions are unchanged, find: 1) Exit temperature of each stream in counterflow operation 2) Lowest temperature to which the oil may be cooled in parallel flow by increasing the length of the exchanger. Note: You do not need any fluid properties for this problem; you also do not need the mass flow rate. Useful relations: Cmin C,= Cmax E parallel 1-exp(-NTU (1+C,)) 1+C, 1-exp(-NTU (1-C,)) Ecounterflow 1-C, exp(-NTU (1-C,)) =