Q/ Refrigeration system operates on a vapor - compression cycle with R-134a as the working fluid. The refrigerant enter the compressor as superheated vapor at 0.1 Mpa and is compressed to 1 Mpa .The superheat and subcooling are 10 C°. Mass flow rate of refrigerant is 0.05 kg/s. Determine :- x4, Qe, Qc, Wc & C.O.P.
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- Two methods used to power refrigeration compressors on a ship are _____and ____.The condensing pressure is 260 psig and the condenser outlet temperature is 108F for R-22. By how many degrees is the liquid subcooled in the condenser? A. 12F B. 42F C. 7F D. 14FWhy is two-stage compression popular for extra-low-temperature refrigeration systems?
- When a standard-efficiency air-cooled condenser is used, the condensing refrigerant will normally be higher in temperature than the entering air temperature.Condensers in these refrigerators are all_______cooled.A typical temperature relationship between a high-efficiency condenser and the ambient temperature is A. 10F. B. 20F. C. 30F. D. 40F.
- REFRIGERATION In a freon-22 refrigeration system, the capacity is 20 tons at a temperature of -20°C. The vapor from the evaporator is pumped by one compressor to the condensing pressure of 40C. Later, the system was revised to a two-stage compression operating on the cycle with intercooling but no removal of flash . Answer the ff: a. Calculate the power required by the single compressor in the original system. b. Calculate the total power required by the two compressors in the revised system.b. A refrigerating system using Freon-12 has an evaporator saturation temperature of - 25°C and a condenser saturation temperature of 35°C. The vapor is dry saturated at entry to the compressor and has a temperature of 65°C after compression to the condenser pressure. There is no undercooling of the liquid in the condenser. i. Calculate the input power required by the compressor per kW of refrigeration. ii. Calculate the COPRef of the refrigerating system. ii. Show the operating cycle of the refrigerating system on a T-s diagram.i need the answer quickly
- In a refrigerant 11 system, one evaporator is to provide 256 kw of refrigerant at 0°C and another evaporator is to provide 228 kw at -20°C. The system uses two stage compression with intercooling and removal of flash gas. The condenser temp is 40°C. h2 = 393 kJ/kg, h4 = 412 kJ/kg Compute the ff:a. mass flow rate at low stage compressor (m1), answer must be in kg/sb. mass flow rate at high stage compressor (m3), answer must be in kg/sc. low stage compressor work, answer must be in kwA refrigerant 22 vapor compression system includes a liquid-to-suction heat exchanger in the system. The heat exchanger cools the saturated liquid from the condenser from 32°C to 21°C with vapor which comes from the evaporator at -10°C. The compressor is capable of pumping 20 L/sec of refrigerant. Determine: a. The COP of the system b. The refrigerating capacity in TORIn a refrigerant 12 system which serves a 250 kw evaporator at -30°C. The system uses two stage compression with intercooling and removal of flash gas. The condenser temp is 40°C. h2 = 357 kJ/kg, h4 = 365 kJ/kg Compute the ff:- mass flow rate at low stage compressor (m1), answer must be in kg/s- mass flow rate at high stage compressor (m3), answer must be in kg/s- low stage compressor work, answer must be in kw