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A compressor receives 0.1 kg/s R-134a at 150 kPa, -10 degrees C and delivers it at 1000 kPa, 40oC. The power input is measured to be 3 kW. The compressor has heat transfer to air at 100 kPa coming in at 20 degrees C and leaving at 25 degrees C.
I'm trying to find the mass flow rate of air, BUT can you please just show me the energy balance and Schematic to set this up. JUST the energy balance and Schematic.
Assumptions:
Continuity Equation is --- Equation 1
where are mass flowrates of R-134a at inlet and outlet respectively.
The balance for this system is
where is mass flowrate of air
h1 and h2 is the Enthalpy of R-134a at inlet and outlet respectively
h3 and h4 is the Enthalpy of air at inlet and outlet respectively.
Win is the Power Input
Assuming air to be an ideal gas and has constant heat capacity, Cp, we get
h4-h3= Cp (T4-T3) -- Equation 2
where T3 and T4 is Temperature of air at inlet and outlet respectively
According to Equations 1 and 2, the balance becomes