oints Air enters a compressor at 179 kPa and 290 K and exits at a temperature of

Question

oints

Air enters a compressor at 179 kPa and 290 K and exits at a temperature of 500.9 K. Determine the power (kW) for the compressor if the inlet volumetric flow rate is 0.125 m3/s and the heat transfer through the shell of the compressor to the surroundings is 2.02 kW. Use the ideal gas tables (variable specific heats).

Answer

Correct Answer: -59.49

Air enters a compressor at 179 kPa and 290 K and exits at a temperature of 500.9 K. Determine the power (kW) for the compressor if the inlet volumetric flow rate is 0.125 m3/s and the heat transfer through the shell of the compressor to the surroundings is 2.02 kW. Use the ideal gas tables (variable specific heats).

Answer

Correct Answer: -59.49

Explanation / Answer

5b)

In throttling, h2 = h1

For R-134a properties, seehttp://www.irc.wisc.edu/properties/ (opens in internet explorer)

At P1 = 11.59 bar and quality = 0 (sat.liq.) we get h1 = 116 kJ/kg

At P2 = 4 bar and h2 = h1 = 116 kJ/kg we get quality x2 = 0.272 = 27.2 %

Postig multiple questions in single post is against Chegg's policy. Thanks.

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