A mixing chamber for air has two inlets and one outlet. Inlet one has a volumetr
ID: 2994734 • Letter: A
Question
A mixing chamber for air has two inlets and one outlet. Inlet one has a volumetric flow rate of 0.2 m^3/s,a pressure of 200 kPa, and a temperature of 75 degrees celcius. The other inlet has a volumetric flow rate of 0.3 m^3/s,
a pressure of 200 kPa, and a temperature of 20 degrees celcius. The outlet pressure is 180 k Pa. Neglecting KE and PE, and assuming the mixing chamber is adiabatic, determine the outlet temperature.?
A mixing chamber for air has two inlets and one outlet. Inlet one has a volumetric flow rate of 0.2 m^3/s,
a pressure of 200 kPa, and a temperature of 75 degrees celcius. The other inlet has a volumetric flow rate of 0.3 m^3/s,
a pressure of 200 kPa, and a temperature of 20 degrees celcius. The outlet pressure is 180 k Pa. Neglecting KE and PE, and assuming the mixing chamber is adiabatic, determine the outlet temperature.?
Explanation / Answer
h1@ 200 kPa & 75 degrees celcius= 348.825 kJ/Kg (from Air property chart)
h2@ 200 kPa & 20 degrees celcius= 293.325 kJ/Kg (from Air property chart)
Let hf is final enthalpy.
balancing energy,
Q1h1 + Q2h2 = (Q1+Q2)hf
hf=[Q1h1 + Q2h2]/(Q1+Q2)
= 315.525. kJ/Kg
And pressure is 180 kPa.
Hence temperature = 42 degrees celcius.(from Air property chart)
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