A steady-flow Carnot refrigeration cycle uses refrigerant-134a as the working fluid. The refrigerant changes from saturated vapour to saturated liquid at 70°C in the condenser as it rejects heat. The evaporator pressure is 100 kPa. Show the cycle on a T-s diagram relative to saturation lines , and determine (a) The coefficient of performance, (b) The amount of heat absorbed from the refrigerated space (c) The network input. a. 2.56 ; 89.20 kJ/kg ; 213.29 kJ/kg b. 2.56 ; 89.20 kJ/kg ; 30.89 kJ/kg c. 2.56 ; 89.20 kJ/kg ; 17.89 kJ/kg d. 2.56 ; 89.20 kJ/kg ; 34.89 kJ/kg

A steady-flow Carnot refrigeration cycle uses refrigerant-134a as the working fluid. The refrigerant changes from saturated vapour to saturated liquid at 70°C in the condenser as it rejects heat. The evaporator pressure is 100 kPa. Show the cycle on a T-s diagram relative to saturation lines , and determine (a) The coefficient of performance, (b) The amount of heat absorbed from the refrigerated space (c) The network input. a. 2.56 ; 89.20 kJ/kg ; 213.29 kJ/kg b. 2.56 ; 89.20 kJ/kg ; 30.89 kJ/kg c. 2.56 ; 89.20 kJ/kg ; 17.89 kJ/kg d. 2.56 ; 89.20 kJ/kg ; 34.89 kJ/kg

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter22: Condensers

Section: Chapter Questions

Problem 7RQ: When a standard-efficiency air-cooled condenser is used, the condensing refrigerant will normally be...

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use the refrigerant tables (134a for example)

MODULE: THERMODYNAMICS

QUESTION 1

A steady-flow Carnot refrigeration cycle uses refrigerant-134a as the working fluid. The refrigerant changes from saturated vapour to saturated liquid at 70°C in the condenser as it rejects heat. The evaporator pressure is 100 kPa. Show the cycle on a T-s diagram relative to saturation lines , and determine

(a) The coefficient of performance,

(b) The amount of heat absorbed from the refrigerated space

(c) The network input.

a.

2.56 ; 89.20 kJ/kg ; 213.29 kJ/kg

b.

2.56 ; 89.20 kJ/kg ; 30.89 kJ/kg

c.

2.56 ; 89.20 kJ/kg ; 17.89 kJ/kg

d.

2.56 ; 89.20 kJ/kg ; 34.89 kJ/kg

Science that deals with the amount of energy transferred from one equilibrium state to another equilibrium state.

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