Consider steady adiabatic airflow in a duct. At section B, the pressure is 660 kPa and...
Consider steady adiabatic airflow in a duct. At section B, the pressure is 660 kPa and the temperature is 177ºC. At section D, the density is 1.13 kg/m3 and the temperature is 156°C. Find the entropy change. Also, determine the way in which the air flow occurs.
The change in entropy is ----- m2/S2.K.
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Consider steady
adiabatic airflow in a duct. At section B, the pressure is 660 kPa
and...
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Apparently, you can solve this problem without knowing the heat loss, and I'm not sure how....
Apparently, you can solve this problem without knowing the heat
loss, and I'm not sure how.
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1.
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1. Airflow enters a duct at a total pressure of 250 kPa and a total temperature of 350 K. The inlet static pressure, P, is 239.35 kPa. The flow exits a converging section at 2 where the area is 0.01 m2. Treat air as an ideal gas where k 14. Pback- 120kpa (a) Determine the Mach number at A2 (b) Determine the exit static pressure and temperature at 2. (c) Determine the mass flow rate. (d) Determine the inlet area...
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Air enters a compressor operating at steady state at a pressure of 100 kPa, a temperature of 290 K, and with a mass flow rate of 0.72 kg/s. At the exit, the pressure is 700 kPa and the temperature is 450 K. Heat transfer from the compressor to its surroundings occurs at a rate of 3 kW. Kinetic and potential energy changes can be ignored. Determine the power input to the compressor, in kW. Assume that the air is an...
Apparently, you can solve this problem without knowing the heat
loss, and I'm not sure how.
3. Air flows through a long duct at 0.25 kg/s. A short section of the duct is cooled by liquid nitrogen that surrounds the duct. The absolute pressure, temperature, and velocity entering the cooled section are 190 kPa, 400 K, and 250 m/s, respectively. At the outlet, the absolute pressure and temperature are 215 kPa and 350 K. Considering the flow to be compressible...
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1.
6. An adiabatic, steady state air compressor compresses 10 L/S of air at 120 kPa and 20 C to 1000 kPa and 300 C. Determine: (a) the mass flow rate of the air in kg/s (b) the power required to drive the air compressor, in kW. Air; c 1.018 kJ/kg K, the gas constant R 0.287 kPa.m/kg.K 1 MPa 300°C Compressor 120 kPa 20°C 101/s
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