A fast-talking salesperson comes to your doorstep and says she is down on her luck and is willing to sell you the patent rights to her most glorious invention. She brings out a mysterious black box and says it can take an inlet stream of ideal gas at 2 kg/s and 4 bar and cool part of it (0.5 kg/s) from 50°C to 210°C with no external parts, as shown below.

You are feeling somewhat adventurous and are tempted by this offer but must ask the fundamental question: “Can it work?” Can it? Explain.

Transcribed Image Text:

0.5 kg/s 1 bar -10C 2 kg/s 4 bar 50C Mysterious black box 1.5 kg/s 1 bar 70C