1. Your company wants to buy a compressor that will operate adiabatically to compress 2 kg/s...

1. Your company wants to buy a compressor that will operate adiabatically to compress 2 kg/s of saturated R-134a vapor at -15°C to a pressure of 1000 kPa. What is the minimum work (in kW) required? Use the right sign convention for work. Hint: The minimum work is that of the reversible process. Start by simplifying the entropy balance!

Answer: -75.92KW

2. Consider the same situation as problem 1. Your company wants to buy a compressor that will operate adiabatically to compress 2 kg/s of saturated R-134a vapor at -15°C to a pressure of 1000 kPa. What is the minimum outlet temperature (in°C) required? Hint: just like before, the minimum outlet temperature occurs when the process is reversible.

answer: 47 C

3. Consider the compressor from problems 1 and 2. You would like the effluent of the compressor to be saturated vapor at 1000 kPa. Calculate what would be the rate of entropy generation (in kW/K) if the compressor is adiabatic.

Only need the answer to this question, thanks

Expert Solution

Amanda K answered 7 months ago

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