Q.13 A vapour compression refrigeration system using refrigerant F-12 is employed toproduce 8640 kg of ice per day. The condensing and evaporating temperature ofrefrigcrant are 48°C and-20°C respectively. Saturated liquid leaves the condenserand saturated vapour leaves the evaporator. Compression is isentropic, water at35°C is used to form the ice. The temperature of ice should be-8°C. Heat flow intothe brine tank from surroundings may be taken as 10% of total heat absorbed fromwater to form ice. Determine the power required to drive the compressor. Take specificheat of ice 2.26 kJ/kg-K. Latent heat of ice = 335 kJ/kg. Specific heat of water =4.2 kJ/kg-K. The following data may be used:%3DTemp. PressureEnthalpyEntropy°CbarkJ/lgkJ/kg-KLiquid Vapour LiquidVapour48°C11.6482.83205.830.29730.6802-201.5117.82178.740.07310.7087Specific heat of vapour 0.82 kJ/kg%3D

Answered: vapour leaves the eva form the ice. The…

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Mechanical Engineering

vapour leaves the eva form the ice. The temp rom surroundings ma e, Determine the power 26 kJ/kg-K. Latent he

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

Chapter28: Special Refrigeration Applications

Section: Chapter Questions

Problem 15RQ: Why is two-stage compression popular for extra-low-temperature refrigeration systems?

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Concept explainers

Chemical and Phase Equilibrium

Phase diagrams or equilibrium phase diagrams are the graphical representations that show the phase transformations of the constituting elements with respect to the pressure, temperature, and compositions. The diagrams show the conditions that limit the different phases, namely solid, liquid, and gas. The diagram can also be utilized to verify the relations between the state variables. Most of the phase diagrams are temperature-pressure phase diagrams, with the variable parameter as the composition. Usually other variables such as solubility and pressure parameters are not indicated in the phase diagram. For a one-component system (unary phase diagram), the phase diagram is generally a function of temperature and pressure as the state variables, or temperature and volume. However, for a binary system (two-phase) having two components, the phase diagram is a function of temperature and composition as the state variables only. Coexisting of the different phases of the constituting elements is indicated in the phase diagram. A ternary phase diagram can be characterized by consisting of three phases in equilibrium.

Question

Q.13 A vapour compression refrigeration system using refrigerant F-12 is employed to
produce 8640 kg of ice per day. The condensing and evaporating temperature of
refrigcrant are 48°C and-20°C respectively. Saturated liquid leaves the condenser
and saturated vapour leaves the evaporator. Compression is isentropic, water at
35°C is used to form the ice. The temperature of ice should be-8°C. Heat flow into
the brine tank from surroundings may be taken as 10% of total heat absorbed from
water to form ice. Determine the power required to drive the compressor. Take specific
heat of ice 2.26 kJ/kg-K. Latent heat of ice = 335 kJ/kg. Specific heat of water =
4.2 kJ/kg-K. The following data may be used:
%3D
Temp. Pressure
Enthalpy
Entropy
°C
bar
kJ/lg
kJ/kg-K
Liquid Vapour Liquid
Vapour
48°C
11.64
82.83
205.83
0.2973
0.6802
-20
1.51
17.82
178.74
0.0731
0.7087
Specific heat of vapour 0.82 kJ/kg
%3D

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