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Engineering, 30.11.2019 05:40 potato3999

Arefrigerator using r-12 as the working fluid keeps the refrigerated space at โˆ’15โ„ƒ in an environment at 30โ„ƒ. you are asked to upgrade this refrigerator by replacing r-12 with the ozone-friendly r-134a or ammonia.

a. what are the temperatures and pressures of the three refrigerants at every stage of the cycle?

b. in / what are work input and heat removal for each refrigerant?

c. what is the cop for each refrigerant? based on cop only, which one would you pick?

d. based on other engineering considerations, which refrigerant would you pick? why?

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Arefrigerator using r-12 as the working fluid keeps the refrigerated space at โˆ’15โ„ƒ in an environment...
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