A supermarket warehouse uses a refrigeration system (see figure) to keep farm produce at 2 C while the temperature outside the warehouse is 30 C. The produce and the outside air act as thermal reservoirs in this process. Although the warehouse is insulated, it absorbs heat from the surroundings at a rate of 775 kW. The condenser operates at 1.6 MPa and the evaporator operates at 300 kPa. Using ammonia as the working material, answer the following: Condenser Expansion Valve Compresser Evaporalor (a) Complete the Table below Phase of ammonia T (K) State Р (Кра) H (KJ/kg) S (kJ/kgK) 300 2 300 1600 4 1600 (b) Determine the power requirement of compressor in KW (c) Determine the COP for a Carnot refrigeration cycle (d) Determine the actual COP of the refrigeration cycle (e) Are you violating the second law of Thermodynamics? Please comment (f) Plot the T-S diagram for the refrigeration cycle

A supermarket warehouse uses a refrigeration system (see figure) to keep farm produce at 2 C while the temperature outside the warehouse is 30 C. The produce and the outside air act as thermal reservoirs in this process. Although the warehouse is insulated, it absorbs heat from the surroundings at a rate of 775 kW. The condenser operates at 1.6 MPa and the evaporator operates at 300 kPa. Using ammonia as the working material, answer the following: Condenser Expansion Valve Compresser Evaporalor (a) Complete the Table below Phase of ammonia T (K) State Р (Кра) H (KJ/kg) S (kJ/kgK) 300 2 300 1600 4 1600 (b) Determine the power requirement of compressor in KW (c) Determine the COP for a Carnot refrigeration cycle (d) Determine the actual COP of the refrigeration cycle (e) Are you violating the second law of Thermodynamics? Please comment (f) Plot the T-S diagram for the refrigeration cycle

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 supermarket warehouse uses a refrigeration system (see
figure) to keep farm produce at 2 C while the temperature
outside the warehouse is 30 C. The produce and the outside
air act as thermal reservoirs in this process. Although the
warehouse is insulated, it absorbs heat from the
surroundings at a rate of 775 kW. The condenser operates
at 1.6 MPa and the evaporator operates at 300 kPa. Using
ammonia as the working material, answer the following:
Condenser
Expansion
Valve
Compresser
Eveporator
(a) Complete the Table below
T (K)
Р (КРа)
н (к)/kg)
S (kJ/kgK)
State
Phase of
ammonia*
1
300
2
300
3
1600
4
1600
(b) Determine the power requirement of compressor in KW
(c) Determine the COP for a Carnot refrigeration cycle
(d) Determine the actual COP of the refrigeration cycle
(e) Are you violating the second law of Thermodynamics? Please comment
(f) Plot the T-S diagram for the refrigeration cycle

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