EML4147C Test 2 Spring 2007

EML4147C Test 2 Spring 2007 - EML 4147C Test 2 Name_ Each...

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EML 4147C Test 2 Name_______________________ Each question worth 5 points. 1a. What is the mass flow rate through each tube? a) 0.1415 kg/s b) 0.2615 kg/s c) 0.3405 kg/s d) 0.4425 kg/s 1b. What is the required heat rate q ? a) 5125 kJ/s b) 10,014 kJ/s c) 6394 kJ/s d) 16,543 kJ/s 1c. What is the minimum number of tubes? a) 432 b) 676 c) 921 d) 43 1d. What is the value of C min for each tube? a) 592 J/(s K) b) 1045 J/(s K) c) 8922 J/(s K) d) 5321 J/(s K) 1e. What is the Reynolds number for flow through each tube? a) 2398 b) 5391 c) 9886 d) 20,873 1f) What is h for the cooling water? a) 2032 W/(m 2 K) b) 9320 W/(m 2 K) c) 15,037 W/(m 2 K) d) 439 W/(m 2 K) 1g) What is the overall heat transfer coefficient U for the system? a) 323 W/(m 2 K) b) 1689 W/(m 2 K) c) 3299 W/(m 2 K) d) 5176 W/(m 2 K) 1h) What is the q max for this system? a) 21210 kW b) 50700 kW c) 11,970 kW d) 9200 kW 1i) What is the effectiveness ε for this system? a) 0.101 b) 0.801 c) 0.301 d) 0.701 2a) What is the critical heat flux? a) 1106 kW/m 2 b) 4406 kW/m 2 c) 9906 kW/m 2 d) 15076 kW/m 2 2b) If the tubes are operated at 75% of the critical heat flux, what is the heat flux of the system? a) 120 kW/m 2 b) 830 kW/m 2 c) 1540 kW/m 2 d) 2550 kW/m 2 Page 1 of 15
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EML 4147C Test 2 Name_______________________ 2c) If the tubes are operated at 75% of the critical heat flux, how many tubes are needed to provide a vapor production rate of 750 kg/hour? a) 4 b) 6 c) 8 d) 10 3a) What is the humidity ratio of the mixture prior to entering the humidifier section? a) 0.0062 b) 0.0088 c) 0.0021 d) 0.0010 3b) What is the humidity ratio at the exit of the system?
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EML4147C Test 2 Spring 2007 - EML 4147C Test 2 Name_ Each...

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