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Design an ideal refrigeration cycle operating with R134a as a working fluid It should maintain the freezer at less than 21oC and have a COP of approximately 5 a For a system that satisfies these

Design an ideal refrigeration cycle operating with R-134a as a working fluid. It should maintain the freezer at less than -21oC and have a COP of approximately 5. a. For a system that satisfies these constraints, determine i. the pressure and temperature of an evaporator, ii. the pressure of a condenser, iii. the specific work input to the pump, iv. the specific heat transfer from the freezer section, and v. the required mass flow rate of R134a if the pump at full power is 1kW b. What are the outside air temperature limits to your design? Briefly explain why c. Redesign the cycle such that it can operate up to a 50oC day. Report on i. the new COP, ii. the new condenser pressure, and iii. the new specific work and heat transfers?

 

Jun 15 2020 View more View Less

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