R-134a enters a cooling coil at -20oC as a saturated mixturewith quality x = 0.123. The refrigerant absorbs heat from thesurrounding at a rate of 300 kW by maintaining a constanttemperature. At the exit, the refrigerant leaves the coil assaturated vapor. At the surrounding (outside of cooling coil), theimmediate temperature is kept at 0oC. Assume steady operatingconditions and no change in kinetic and potential energy,determine:
I. From energy balance equation, derive the equation todetermine the mass flow rate of the refrigerant, πΜπ
(do not solveit yet)! (5 marks)
II. From (I), calculate the mass flow rate of the refrigerant,πΜπ
, in kg/s. (5 marks)
III. From entropy balance equation, derive the equation todetermine the entropy generation, πΜ πππ (do not solve it yet)! (5marks)
IV. From (III), calculate the entropy generation of the process,πΜ πππ, in kW/K. (6 marks)
R-134a enters a cooling coil at -20oC as a saturated mixture with quality x = 0.123. The refrigerant absorbs heat from t
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R-134a enters a cooling coil at -20oC as a saturated mixture with quality x = 0.123. The refrigerant absorbs heat from t
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