A closed, rigid tank contains 5 kg mass of R-134 a, initially at 90C. The refrig

Question

A closed, rigid tank contains 5 kg mass of R-134 a, initially at 90C. The refrigerant is cooled until it becomes saturated vapor at 12 C. Determine the heat that must be removed from the tank at accomplish this process.
a) 501 kJ b) 338 kJ c) 1.5 kJ, d) 12.99 kJ e) 210 kJ
Show work. A closed, rigid tank contains 5 kg mass of R-134 a, initially at 90C. The refrigerant is cooled until it becomes saturated vapor at 12 C. Determine the heat that must be removed from the tank at accomplish this process.
a) 501 kJ b) 338 kJ c) 1.5 kJ, d) 12.99 kJ e) 210 kJ
Show work.
a) 501 kJ b) 338 kJ c) 1.5 kJ, d) 12.99 kJ e) 210 kJ
Show work.

Explanation / Answer

Given mass of the refregirant 5 kg

Initial temperature of R-143a is 90oC

Final temperature of R 143a is 12oC

Since given tank is rigid, the process is constant volume process.

Heat removed from R- 143 a = m cv dt

= 5 × 0.2021× (90-12)

= 78.82 kJ

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