1. A device with refrigerant-134a as the working fluid as illustrated in figure attached is used to keep a room at 26°C by rejecting the waste heat to the outdoor air at 34°C. The room gains heat from various sources amounting to 15 kW. The refrigerant enters the compressor at 500 kPa as a saturated vapor at a rate of 1000 L/min and leaves at 1200 kPa and 50°C. Determine (a) the mass flow rate of the refrigerant (b) the actual COP (c) the maximum COP (d) the minimum mass flow rate of the refrigerant for the same refrigeration load. 2 Condenser Expansion valve Compressor Evaporator a 1.2 MPa 50°C 500 kPa sat. vap.
1. A device with refrigerant-134a as the working fluid as illustrated in figure attached is used to keep a room at 26°C by rejecting the waste heat to the outdoor air at 34°C. The room gains heat from various sources amounting to 15 kW. The refrigerant enters the compressor at 500 kPa as a saturated vapor at a rate of 1000 L/min and leaves at 1200 kPa and 50°C. Determine (a) the mass flow rate of the refrigerant (b) the actual COP (c) the maximum COP (d) the minimum mass flow rate of the refrigerant for the same refrigeration load. 2 Condenser Expansion valve Compressor Evaporator a 1.2 MPa 50°C 500 kPa sat. vap.
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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Transcribed Image Text:1. A device with refrigerant-134a as the working fluid as illustrated in figure attached is
used to keep a room at 26°C by rejecting the waste heat to the outdoor air at 34°C. The
room gains heat from various sources amounting to 15 kW. The refrigerant enters the
compressor at 500 kPa as a saturated vapor at a rate of 1000 L/min and leaves at 1200
kPa and 50°C. Determine
(a) the mass flow rate of the refrigerant
(b) the actual COP
(c) the maximum COP
(d) the minimum mass flow rate of the
refrigerant for the same refrigeration load.
QH
Condenser
Expansion
valve
Compressor
Evaporator
1.2 MPa
50°C
500 kPa
sat. vap.
Win
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