100 ton of vapor compression refrigeration system using R-134a the vapor entering the evaporator at 2 bar and entering the condenser at 10 bar, the pressure drops in suction valve and discharge valve equal to 0.25 bar and 1.0 bar respectively. assume the refrigerant leaving the evaporator and condenser at saturated line find: (1) Refrigeration Effect (2) Power required in compressor (3) Actual COP of the cycle (4) Ideal COP of the cycle

100 ton of vapor compression refrigeration system using R-134a the vapor entering the evaporator at 2 bar and entering the condenser at 10 bar, the pressure drops in suction valve and discharge valve equal to 0.25 bar and 1.0 bar respectively. assume the refrigerant leaving the evaporator and condenser at saturated line find: (1) Refrigeration Effect (2) Power required in compressor (3) Actual COP of the cycle (4) Ideal COP of the cycle

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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Similar questions

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Why is two-stage compression popular for extra-low-temperature refrigeration systems?
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Q1/ In simple refrigeration system for residential refrigerator uses R134a, the evaporator temperature is -20C and the condenser temperature is 30C. The refrigerant enters the compressor as saturated vapor (x = 1). If the mass flowrate is 1 kg/s. Determine: 1. Compressor work (w). 2. Rejected heat from the condenser. 3. Refrigeration effect (RE). 4. Coefficient of Performance (COP).
A vapor compression refrigeration systemhas an enthalpy of saturated liquid at the hightemperature side is 341.769 kJ/kg while at lowtemperature side is 131.27 kJ/kg and a latentheat of vaporization of 1312.63 kJ/kg. If themass flow rate of refrigerant is 0.50 kg/s.compute the tons of refrigeration.
A compressor serves two evaporators, one providing 5 tons of cooling at -20 degree F and the other, 10 tons of cooling at 10F. The system is a vapor-compression refrigeration system using R-12 with the condenser pressure at 200 psia. Assume saturated conditions leaving the condenser and evaporators and isentropic compression. Determine (a) the refrigerant flow through each evaporator, (b) the R-12 state entering the compressor, and (c) the compressor power.
In an ideal vapour-compression refrigeration cycle, refrigerant R-12 enters the compressor as a saturated vapour at −18 degree C and leaves the condenser as a saturated liquid at 25 degree C. The mass flow rate of the refrigerant is 0.5 kg/s, and the pressure drop in the evaporator and the condenser are negligible. Calculate: a) the refrigeration effect (rate of refrigeration or heat transfer rate in the evaporator) b)power consumed by the compressor c)the coefficient of performance of the refrigerator) d)qualityof the refrigerant after the expansion valve e)heat transfer rate in the condenser
Refrigerant R12 is used in a vapour compression cycle. The saturated vapour entersthe compressor at -18.8°C, and subsequently leaves at 75°C and 10 bar. Thesaturated liquid leaving the condenser is at 10 bar. The resulting stream is throttledand evaporated before being fed back to the compressor. a) Determine the coefficient of performance of the refrigerator. Take the specific enthalpy,h, at 10 bar and 36 K of superheat to be 163.7 kJ/kgb) Obtain the isentropic efficiency of the compressor. Take the specific entropy, s, at 10bar to be 1.188 kJ/kg
A refrigeration system operates on an ideal vapor compression using R-12 with an evaporator temperature of -30 C and a condenser exit temperature of 49.30C and requires 74.6 kW motor to drive the compressor. What is the capacity of the refrigerator in tons of refrigeration? Enthalpy at the condenser ,entrance = 382KJ/Kg, exit = 248.15KJ/Kg, at evaporator entrance= 248.15kJ/kg, exit =338.14kJ/kg.
Saturated vapor Freon 12 refrigerant at 219.12 kPa leaves the evaporator and enters the compressor at -5 °C. The refrigerant leaves the condenser as saturated liquid at 25°C and enters the ex pansion valve at 22°C. Heat rejected from the condenser amount to 75 kW. The work to the compressor is 55.5 kJ/kg, while the heat lost from the compressor is 4.2 kJ/kg. If 1.15 kJ/kg of heat are lost in the piping between the compressor and condenser, cal culate the refrigeration capacity in tons.
Refriegerant ammonia enters the compressor of a refriegerant as a superheated vapor at 0.14 MPa, -20 °C at a rate of 0.04 kg/s, and leaves at 0.8 MPa, 50 °C. The refriegerant is cooled in the condenser to 0.75 MPa and is throttled to 0.14 MPa. Disregarding any heat transfer and pressure drops in the connecting lines between components, determine:a) the rate of heat removal from the refriegerated space in kWb) the power input to the compressor in KWc) the COP pf the cycle
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