7-104 An air conditioner with refrigerant-134a as the working fluid is used to keep a room at 23°C by reject ing the waste heat to the outdoor air at 34°C. The room gains heat through the walls and the windows at a rate o 250 kJ/min while the heat generated by the computer, TV and lights amounts to 900 W. The refrigerant enters the com pressor at 400 kPa as a saturated vapor at a rate of 80 L/mi and leaves at 1200 kPa and 70°C. Determine (a) the actua COP, (b) the maximum COP, and (c) the minimum volum flow rate of the refrigerant at the compressor inlet for the same compressor inlet and exit conditions. Answers: (a) 4.33 (b) 26.9, (c) 12.9 L/min QH

7-104 An air conditioner with refrigerant-134a as the working fluid is used to keep a room at 23°C by reject ing the waste heat to the outdoor air at 34°C. The room gains heat through the walls and the windows at a rate o 250 kJ/min while the heat generated by the computer, TV and lights amounts to 900 W. The refrigerant enters the com pressor at 400 kPa as a saturated vapor at a rate of 80 L/mi and leaves at 1200 kPa and 70°C. Determine (a) the actua COP, (b) the maximum COP, and (c) the minimum volum flow rate of the refrigerant at the compressor inlet for the same compressor inlet and exit conditions. Answers: (a) 4.33 (b) 26.9, (c) 12.9 L/min QH

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

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Concept explainers

Mechanisms of heat transfer

Heat transfer is an essential discipline in thermal engineering that deals with the transfer, conversion, usability, and creation of heat or thermal energy. Transfer of heat occurs through various mechanisms like conduction, convection, radiation, and change of phases. All these mechanisms have distinct characteristics, but these mechanisms can simultaneously occur in an identical system.

Question

Solve correctly please.

7-104 An air conditioner with refrigerant-134a as the
working fluid is used to keep a room at 23°C by reject-
ing the waste heat to the outdoor air at 34°C. The room
gains 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. The refrigerant enters the com-
pressor at 400 kPa as a saturated vapor at a rate of 80 L/min
and leaves at 1200 kPa and 70°C. Determine (a) the actual
COP, (b) the maximum COP, and (c) the minimum volume
flow rate of the refrigerant at the compressor inlet for the
same compressor inlet and exit conditions. Answers: (a) 4.33,
(b) 26.9, (c) 12.9 L/min
fo
Expansion
valve
QH
Condenser
Compressor
Evaporator
1.2 MPa
70°C
400 kPa
sat. vapor
Win

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