An air conditioner with refrigerant-134a as theworking fluid is used to keep a room at 26C by rejectingthe waste heat to the outside air at 34C. The room isgaining heat through the walls and the windows at a rate of 250 kJ/min while the heat generated by the computer,TV, and lights amounts to 900 W. An unknown amountof heat is also generated by the people in the room. Thecondenser and evaporator pressures are 1200 and 500 kPa,respectively. The refrigerant is saturated liquid at the condenserexit and saturated vapor at the compressor inlet. Ifthe refrigerant enters the compressor at a rate of 100 L/minand the isentropic efficiency of the compressor is 75 percent,determine (a) the temperature of the refrigerant at thecompressor exit, (b) the rate of heat generation by the peoplein the room, (c) the COP of the air conditioner, and(d) the minimum volume flow rate of the refrigerant at thecompressor inlet for the same compressor inlet and exitconditions.
An air conditioner with refrigerant-134a as the
working fluid is used to keep a room at 26C by rejecting
the waste heat to the outside air at 34C. The room is
gaining heat through the walls and the windows at a rate of 250 kJ/min while the heat generated by the computer,
TV, and lights amounts to 900 W. An unknown amount
of heat is also generated by the people in the room. The
condenser and evaporator pressures are 1200 and 500 kPa,
respectively. The refrigerant is saturated liquid at the condenser
exit and saturated vapor at the compressor inlet. If
the refrigerant enters the compressor at a rate of 100 L/min
and the isentropic efficiency of the compressor is 75 percent,
determine (a) the temperature of the refrigerant at the
compressor exit, (b) the rate of heat generation by the people
in the room, (c) the COP of the air conditioner, and
(d) the minimum volume flow rate of the refrigerant at the
compressor inlet for the same compressor inlet and exit
conditions.
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