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…
- A Single Stage Vapor Compression (SSVC) refrigeration system has a cooling capacity of 7.5 tons. The following are the actual conditions: discharge of the evaporator is at -30°C & 0.2 MPa, discharge of the condenser is at 30°C & 2.0 MPa, discharge of the compressor is at 130°C & 2.5 MPa. Determine the compressor efficiency.A Single Stage Vapor Compression (SSVC) refrigeration system has a cooling capacity of 7.5 tons. The following are the actual conditions: discharge of the evaporator is at -30°C & 0.2 MPa, discharge of the condenser is at 30°C & 2.0 MPa, discharge of the compressor is at 130°C & 2.5 MPa. Determine the COP of the system.5. A refrigeration system using R-12 as refrigerant consists of throe evaporators of capacities 20 TR at – 5°C, 30 TR at 0°C and 10 TR at 5°C. The vapours leaving the three evaporators are dry and saturated. The system is provided with individual compressors and multiple expansion valves. The condenser temperature is 40°C and the liquid refrigerant leaving the condenser is saturatoed. Assuming isentropic compression in each compressor, find (a) the mass of refrigerant flowing through cach evaporator, (b) the power required to drive the system, and (c) the C.O.P. of the system. [Ans. 27.4 kg/min, 42.25 kg/min: 34.12 kg/min; 38.4 kW; 5.56]
- 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.question 50 an ideal vapor-compression refrigeration cycle that uses refrigerant-134a as its working fluid maintains a condenser at 800 kPa and the evaporator at -12 C. Determine this system’s COP and the amount of power required to service a 150 kW cooling load. What is the specific enthalpy at the compressor exit to 2 decimal places? No need to add units to the answer.Please draw the diagram of the components of the vapor compression refrigeration cycle and briefly discuss its process.