Refrigerant 22 enters the compressor of an air-conditioning unit operating at steady state at 4°C, 5.5 bar and is compressed to 60°C, 14 bar. The refrigerant exiting the com- pressor enters a condenser where energy transfer to air as a separate stream occurs and the refrigerant exits as a liquid at 14 bar, 32°C. Air enters the condenser at 27°C, 1 bar with a volumetric flow rate of 20.25 mº/min and exits at 43°C. Neglecting stray heat transfer and kinetic and potential energy effects, and assuming ideal gas behavior for the air, determine (a) the mass flow rate of refrigerant, in kg/min, and (b) the compressor power, in kilowatt.
Refrigerant 22 enters the compressor of an air-conditioning unit operating at steady state at 4°C, 5.5 bar and is compressed to 60°C, 14 bar. The refrigerant exiting the com- pressor enters a condenser where energy transfer to air as a separate stream occurs and the refrigerant exits as a liquid at 14 bar, 32°C. Air enters the condenser at 27°C, 1 bar with a volumetric flow rate of 20.25 mº/min and exits at 43°C. Neglecting stray heat transfer and kinetic and potential energy effects, and assuming ideal gas behavior for the air, determine (a) the mass flow rate of refrigerant, in kg/min, and (b) the compressor power, in kilowatt.
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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Refrigerant 22 enters the compressor of an air-conditioning unit operating at steady state at 4°C, 5.5 bar and is compressed to 60°C, 14 bar. The refrigerant exiting the com- pressor enters a condenser where energy transfer to air as a separate stream occurs and the refrigerant exits as a liquid at 14 bar, 32°C. Air enters the condenser at 27°C, 1 bar with a volumetric flow rate of 20.25 mº/min and exits at 43°C. Neglecting stray heat transfer and kinetic and potential energy effects, and assuming ideal gas behavior for the air, determine
(a) the mass flow rate of refrigerant, in kg/min, and
(b) the compressor power, in kilowatt.
Transcribed Image Text:Condenser
5
ww
T3 = 43°C
Air at T, = 27°C. pP4 = 1 ban
(AV), = 20.25 m³/min.
3
ww
T2= 60°C
P2 = 14 bar
T3= 32°C
P3 = 14 bar
Compressor
R22 at
T= 4°C
P =5.5 bar
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