Solve asap The cold storage room is maintained at T, -70 °C by two stage vapor-compression refrigeration unit. In thelow temperature cycle, R170 (ethane) is used as the working fluid. In the high temperature cycle, R134a is usedas the working fluid. After selecting reasonable pressures for all heat exchangers, calculate evaporatorcapacity, COP of the system, and compressor powers. Show refrigeration cycles on P-h diagrams uploaded withthe midterm exam question sheet. Draw the T-s diagrams of R134a and R170 cycles as well. Draw schematicof refrigeration system with its components.Notes1) Isentropic efficiency of compressors are 0.75.2) Refrigerants leave the condensers as saturated liquid and exit from the evaporators as saturated vapor.KÜLT3) When detemining the cooling requirement, only the wall conduction load will be taken into account.(consider 5 walls, neglect heat loss through the floor)4) The inner and outer walls are normally covered with steel sheets, but their conduction resistance can beneglected due to high heat conductivity constant k of steel.See the Lecture Note titled "Refrigeration" regarding two stage vapor-compression refrigeration cyclesCold Storage5 cm thick polyurethane foaminsulation materialis used for all storage walls.Kan 0.035 w/m.C2mT-70°Ch-10 W/m2CT 25°Ch10 W/mC1m1mHeat loss throughthe floor is neglected.

Solution: Area, A = 4 x (2 x 1) + (1 x 1) = 9 m2 Qin = (ko x A (To - Ti)) / t Qin = (0.035 x 9 (25 +…

The cold storage room is maintained at T, -70 C by two stage vapor-compression refrigeration unit. In the empcrature evcle. R170 (ethane) is used as the working fluid. In the high temperature cycle, R134a is used

The cold storage room is maintained at T, -70 C by two stage vapor-compression refrigeration unit. In the empcrature evcle. R170 (ethane) is used as the working fluid. In the high temperature cycle, R134a is used

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

Solve asap

The cold storage room is maintained at T, -70 °C by two stage vapor-compression refrigeration unit. In the
low temperature cycle, R170 (ethane) is used as the working fluid. In the high temperature cycle, R134a is used
as the working fluid. After selecting reasonable pressures for all heat exchangers, calculate evaporator
capacity, COP of the system, and compressor powers. Show refrigeration cycles on P-h diagrams uploaded with
the midterm exam question sheet. Draw the T-s diagrams of R134a and R170 cycles as well. Draw schematic
of refrigeration system with its components.
Notes
1) Isentropic efficiency of compressors are 0.75.
2) Refrigerants leave the condensers as saturated liquid and exit from the evaporators as saturated vapor.
KÜLT
3) When detemining the cooling requirement, only the wall conduction load will be taken into account.
(consider 5 walls, neglect heat loss through the floor)
4) The inner and outer walls are normally covered with steel sheets, but their conduction resistance can be
neglected due to high heat conductivity constant k of steel.
See the Lecture Note titled "Refrigeration" regarding two stage vapor-compression refrigeration cycles
Cold Storage
5 cm thick polyurethane foam
insulation material
is used for all storage walls.
Kan 0.035 w/m.C
2m
T-70°C
h-10 W/m2C
T 25°C
h10 W/mC
1m
1m
Heat loss through
the floor is neglected.

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