Question

Asked Oct 26, 2019

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Refrigerant R-134a enters a 30cm diameter pipe (circular cross-section) at an absolute pressure of 200 kPa and a temperature of 10 °C with a velocity of 5 m/sec. Heat is transferred to the refrigerant as it flows and the gas leaves the pipe at 180 kPa and 50 °C. Find the following quantities:

a. The volume flow rate at the exit in m^{3} /sec.

b. The exit velocity in m/sec.

Step 1

Given data:

The diameter of the pipe, d = 30 cm.

The absolute pressure at inlet, P_{1} = 200 kPa.

The absolute pressure at inlet, P_{2} = 180 kPa.

The inlet temperature, T_{1}= 10 ^{o}C.

The exit temperature, T_{2 }= 50 ^{o}C.

The velocity at the inlet, v_{1 }= 5 m/s.

Step 2

From the property table of refrigerant R-134a, obtain the value of specific volume at the inlet and the outlet of the pipe.

Step 3

Calculate the volumetric flo...

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