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EML4147C Test 2 Fall 07

# EML4147C Test 2 Fall 07 - EML 4147C Test 2 Fall 2007 Name...

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EML 4147C Test 2 Fall 2007 Name_______________________ 1a) What is the critical heat flux? a) 1106 kW/m 2 b) 4406 kW/m 2 d) 9906 kW/m 2 d) 15076 kW/m 2 e) 21,293 kW/m 2 1b) 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 e) 12 1c) If the tubes are operated at 75% of the critical heat flux, what is the surface temperature of the polished copper tubes? a) 102 °C b) 104 °C c) 118 °C d) 129 °C e) 135 °C 2a) 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 e) 0.0014 2b) What is the humidity ratio at the exit of the system? a) 0.0044 b) 0.014 c) 0.0098 d) 0.0074 e) 0.0021 2c) What is the temperature of the air when it leaves the heating section? a) 24.6 °C b) 34.6 °C c) 40.6 °C d) 15.6 °C e) 49.2 °C 3a) What is the view factor from the bottom plate to the cone? a) .11111 b) .88888 c) .99999 d) .33333 e) .44444 3b) What is the view factor from the bottom plate to the surroundings? a) .11111 b) .88888 c) .99999 d) .33333 e) .44444 3c) What is the temperature of the conical surface, T 2 ?

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