A refrigeration plant works between the temperatures limits of -5°C and 25°C. The refrigerant is CO2 is wet at the entry to the compressor and has dryness fraction of 0.6. The refrigerator has actual COP 70% of the theoretical COP. If there is no under-cooling, determine the ice formed during a period of 24 hours from 20°C. The mass of CO2 circulated is 5kg/min. Take enthalpy of fusion of ice as 336 kJ/kg. The properties of CO2 are as follows: Saturation temperature (C°) Specific enthalpy (kJ/kg) hg 202.75 Specific entropy (kJ/kg-K) hf Sf 25 81.25 0.2513 -5 -7.53 238.5 -0.04187

A refrigeration plant works between the temperatures limits of -5°C and 25°C. The refrigerant is CO2 is wet at the entry to the compressor and has dryness fraction of 0.6. The refrigerator has actual COP 70% of the theoretical COP. If there is no under-cooling, determine the ice formed during a period of 24 hours from 20°C. The mass of CO2 circulated is 5kg/min. Take enthalpy of fusion of ice as 336 kJ/kg. The properties of CO2 are as follows: Saturation temperature (C°) Specific enthalpy (kJ/kg) hg 202.75 Specific entropy (kJ/kg-K) hf Sf 25 81.25 0.2513 -5 -7.53 238.5 -0.04187

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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Question

A refrigeration plant works between the temperatures limits of -5°C and 25°C. The
refrigerant is CO2 is wet at the entry to the compressor and has dryness fraction of 0.6. The
refrigerator has actual COP 70% of the theoretical COP. If there is no under-cooling, determine the
ice formed during a period of 24 hours from 20°C. The mass of CO2 circulated is 5kg/min. Take
enthalpy of fusion of ice as 336 kJ/kg. The properties of CO2 are as follows:
Saturation temperature
(C°)
Specific enthalpy (kJ/kg)
hf
Specific entropy (kJ/kg-K)
hg
Sf
25
81.25
202.75
0.2513
-5
-7.53
238.5
-0.04187

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