Figure P6.95 provides steady-state test data for a control(adsbygoogle = window.adsbygoogle || []).push({});

volume in which two entering streams of air mix to form a

single exiting stream. Stray heat transfer and kinetic and

potential energy effects are negligible. A hard-to-read

photocopy of the data sheet indicates that the pressure of

the exiting stream is either 1.0 MPa or 1.8 MPa. Assuming

the ideal gas model for air with Cp = 1.02 kJ/kg . K, determine

if either or both of these pressure values can be correct.

Figure shows that:

T1 = 800k

P1 = 1.8Mpa

m(dot)1=1kg/s

T2 = 650K

P2 = 1.0Mpa

m(dot)2 = 2 kg/s

P3 = 1.0Mpa OR 1.8 Mpa (to ues for calculations about wether it is even possible)

i found h1 = 821.95, h2 = 659.84 using thermo tables

So far i have used 0 = m1(h1) + m2(h2) - m3(h3) to find that h3 is 713.88

Im really struggling with the concept of two inlets and finding the change (DELTA)h to use to find the outlet Temp right now.. using (DELTA)h = Cp(DELTA T)...

Where should i go next? I believe i need to find the Delta h but im really not sure. i've spent hours on this.

Thanks!

PCP

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# Thermodynamics Control Volume evaluation 2 inlet

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