an ideal gas refrigeration system operates with air as the working fluid. air is at 100kpa and 20 degree celcius before compression and 500 kpa and 30 degree celcius before expansion. the system is to provide
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an ideal gas refrigeration system operates with air as the working fluid. air is at 100kpa and 20 degree celcius before compression and 500 kpa and 30 degree celcius before expansion. the system is to provide
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- When a standard-efficiency air-cooled condenser is used, the condensing refrigerant will normally be higher in temperature than the entering air temperature.If an ideal refrigeration cycle (using R-134a) operation at evaporator temperature -10 °C and Condenser temperature +30 °C, what is the dryness factor of the Refrigerant at entering evaporator?13. A food storage locker requires a refrigeration system of 2500 kJ/min capacity at an evaporator temperature of – 10°C and a condenser temperature of 30°C. The refrigerant used is Freon-12 and sub-cooled by 5°C before entering the expansion valve and vapour is superheated by 6°C before leaving the evaporator coil. The compression of refrigerant is reversible adiabatic. The refrigeration compressor is two-cylinder single- acting with stroke equal to 1.3 times the bore and operates at 975 r.p.m. Determine (using thermodynamic tables of properties for Freon-12): (i) Refrigerating effect per kg. (ii) Mass of refrigerant to be circulated per minute. (iii) Theoretical piston displacement per minute. (iv) Theoretical power required to run the compressor, in kW. (v) Heat removed through the condenser per minute. (vi) Theoretical bore and stroke of compressor. Properties of Freon-12 Saturation Absolute Enthalpy Entropy Specific volume of temp. pressure Liquid kJ/kg Vapour kJ/kg °C vapour…
- 1. A 10-kW cooling load is to be served by operating an ideal vapor-compression refrigeration cycle with its evaporator at 400 kPa and its condenser at 800 kPa. If the compressor's isentropic efficiency is 68%, calculate the refrigerant mass flow rate and the compressor power requirement when refrigerant-134a is used.Aa 3. A vapour compression refrigeration system of 2400 kJ/min capacity works at an evaporator temperature of 263 K and a condenser temperature of 303 K. The refrigerant used is R-12 and is subcooled by 6°C before entering the expansion valve and vapour is superheated by 7°C before leaving the evaporator coil. The compression of refrigerant is reversible adiabatic. The refrigeration compressor is two-cylinder, single acting with stroke equal to 1.25 times the bore and runs at 1000 r.p.m. Determine: 1. Refrigerating effect per kg ; 2. Mass of refrigerant circulated per minute; 3. Theoretical piston displacement per minute ; 4. Power required to run the com pressor; 5. Heat removed in through condenser ; and 6. Bore and stroke of the compressor. I want the solution on a piece of paper and using the diagram الأصدقاء المقربونA refrigerant system with a capacity of 15 tons of refrigeration operates at 150 KPA evaporator while in the condenser is 1380 KPA if the refrigerant R-717 is in a saturated state calculate the theoretical power required to operate the compressor.
- An ideal vapor compression refrigeration cycle with R-134a as the working fluid operates between the pressure limits of 120 kPa and 1000 kPa. The mass fraction of the refrigerant that is in the liquid phase at the inlet of the evaporator is: Please use ur own steamtable Ans : 0.6An ideal vapor-compression refrigeration cycle with refrigerant-134a as the working fluid is maintains a condenser at 1000 Kpa and the evaporator 40C. Determine the COP and the amount of power required to service a 400 KW cooling load.Figure below shows a two-stage vapor-compression refrigeration system with ammoniaas the working fluid. The system uses a direct-contact heat exchanger to achieve intercooling. Theevaporator has a refrigerating capacity of 30 tons and produces −20°F saturated vapor at its exit.In the first compressor stage, the refrigerant is compressed adiabatically to 80 lbf/ in 2 , which is thepressure in the direct contact heat exchanger. Saturated vapor at 80 lbf/ in 2 enters the secondcompressor stage and is compressed adiabatically to 250 lbf/ in 2 . Each compressor stage has anisentropic efficiency of 85%. There are no significant pressure drops as the refrigerant passesthrough the heat exchangers. Saturated liquid enters each expansion valve. Determinea) the ratio of mass flow rates, ?̇ 3 /?̇ 1b) the power input to each compressor stage, in horsepower.c) the coefficient of performance.