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An insulated vertical piston - cylinder device initially contains 0 . 8 m 3 of refrigerant - 1 3 4 a at 1 . 2
An insulated vertical pistoncylinder device initially
contains of refrigeranta at MPa and
A linear spring at this point applies full force to the
piston. A valve connected to the cylinder is now opened,
and refrigerant is allowed to escape. The spring unwinds as
the piston moves down, and the pressure and volume drop
to MPa and at the end of the process. Determine
a The amount of refrigerant that has escaped
b The final temperature of the refrigerant.
A commercial refrigerator with refrigeranta
as the working fluid is used to keep the refrigerated
space at by rejecting waste heat to cooling
water that enters the condenser at at a rate of
and leaves at The refrigerant enters
the condenser at MPa and and leaves at the
same pressure subcooled by If the compressor
consumes of power, determine
a The mass flow rate of the refrigerant
b The refrigeration load
c The COP
d The minimum power input to the compressor
for the same refrigeration load
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