- Thermodynamics 1 (60.47 KiB) Viewed 10 times
Thermodynamics
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Thermodynamics
Thermodynamics
An exhaust pipe of 75 mm outside diameter is cool by surrounding it by an annular space containing water. The exhaust gas enters the exhaust pipe at 3500 C and the water enters from the mains at 10°C. The heat transfer coefficients for the gases and water are 0.3 and 1.5 kW/m2 K, respectively and the pipe thickness may be taken to be negligible. The gases are cool to 100 °C and the mean specific heat capacity at constant pressure is 1.13 kJ/ kg K. The gas flow rate is 200kg/hr and the water flow rate is 1400 kg/h. The specific heat capacity of water is 4.19 kJ/kg K. State three (3) assumptions. Calculate: (i) The required pipe length for parallel-flow; (ii) The required pipe length for counter-flow.
An exhaust pipe of 75 mm outside diameter is cool by surrounding it by an annular space containing water. The exhaust gas enters the exhaust pipe at 3500 C and the water enters from the mains at 10°C. The heat transfer coefficients for the gases and water are 0.3 and 1.5 kW/m2 K, respectively and the pipe thickness may be taken to be negligible. The gases are cool to 100 °C and the mean specific heat capacity at constant pressure is 1.13 kJ/ kg K. The gas flow rate is 200kg/hr and the water flow rate is 1400 kg/h. The specific heat capacity of water is 4.19 kJ/kg K. State three (3) assumptions. Calculate: (i) The required pipe length for parallel-flow; (ii) The required pipe length for counter-flow.