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Air enters a counterflow heat exchanger operating at steady state at 22°C, 0.1 MPa and exits at 7°C. Refrigerant 134a enters at 0.2 MPa, a quality of 0.33, and a mass flow rate of 30 kg/h. Refrigerant exits at 0°C. There is no significant change in pressure for either stream.

(a) For the Refrigerant 134a stream, determine the rate of heat transfer, in kJ/h

(b) For the refrigerant stream evaluate the change in flow exergy rate, in kJ/h.

(c) For the air stream evaluate the change in flow exergy rate, in kJ/h.

Let T₀ = 22°C, p₀ = 0.1 MPa, and ignore the effects of motion and gravity.
Round your answers to 3 significant digits.

Expert Solution

samet mamat answered 2 years ago

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