An air refrigeration cycle operates on a Bell Coleman Cycle. Air which is taken from a cold chamber at -5°C, is compressed from 1 bar to 5.5 bar. The compressed air is then cooled to 27°C. The index of compression is 1.25 while the index of expansion is 1.35. Determine the heat rejected at the air cooler. A. - 36.9 kJ/kg B. - 46.9 kJ/kg C. - 76.9 kJ/kg D. - 106.9 kJ/kg
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- The most popular refrigerant used in the past for residential air-conditioning is R- ________.1. A Freon-12 refrigerator producing a cooling effect of 20 kJ/s operates on a simple cycle with pressure limits of 1.509 bar and 9.607 bar. The vapour leaves the evaporator dry saturated and there is no undercooling. Determine the power required by the machine. If the compressor operates at 300 rpm. and has a clearance volume of 3% of stroke volume, determine the piston displacement of the compressor. For compressor assume that the expansion following the law pv13 = constant.A reversible refrigerator operates using a Carnot refrigeration cycle. It operates usingr-134a between 140 and 400 kPa. The refrigerant exits the compressor (and enters the condenser) assaturated vapor. It also leaves the condenser as saturated liquid.a. Sketch the P-v and T-s diagram of this cycle. Define the coordinate properties of each state oneach graph.b. Evaluate the specific heat and specific work properties of each (in kJ/kg). Indicate the sense.c. Evaluate the coefficient of performance using the specific heats and works from the previousitem. Did it match with the COPR obtained if you used the operating temperatures? Solve for states first. Then, show the solution to each of the above required in order.
- 1.An air compression refrigeration system is to have an air pressure of 100 psia in the brine tank andan allowableair temperature increase of 60 deg F. For standardvapour compression cycle. Temperatures of 77 degF entering the expansion cylinder and 14 deg F entering the compression cylinder, calculate the coefficient of performance.1) A vapor compression cycle using Ammonia as refrigerant operates at an evaporating temperature of -5 deg. Centigrade and a condensing temperature of 35 deg. Centigrade. The liquid Ammonia was subcooled before entering the thermostatic expansion valve (TEV) to 30°C and the suction vapor was superheated to 20°C without useful cooling. Determine a) the Coefficient of Performance of the cycle. For 15 TOR determine b) the power required by the compressor c) the heat rejected in the condenser d) volume flow rate at the suction.5. A load of 10 tons is to be carried by an air refrigeration cycle with suction pressure of 15 psia and discharge pressure of 90 psia . The compression process has a polytropic exponent of 1.3 whereas the expansion process exponent is 1.37 . Pressure at the start of expansion is 83 psia and temperature is 80 deg F . Air temperature after useful heat addition is 34 deg F and the air undergoes at 15 deg F temperature rise in the piping during return to compression suction . Clearance is zero .Calculate the piston displacement cubic feet per min. in A) 976 B) 769 C) 679 D) 509
- A compound compression system below, Sketch (ph) diagram for cycle and calculate : 1. Total compressor work. 2. Q condenser 3. Enthalpy drops of refrigerant after sub-cooler 3 Water inter cooler Refrigerant (working fluid) R717 Low Cycle Pressure 1.8 bar Intermediate Cycle Pressure 4 bar T3= 40 °C Low stage compressor High stage compressor Ts= 50 °C Evaporator Qwraporation=1130 kJ/kg Expansion valve Condenser Sub-coolerRefrigerant 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/kgA standard vapour compression cycle using freon 22 operates on simple saturation cycle at the following conditions: Refregirating capacity 15TR condensing temperature 42 C and evaporating temperature -2 C. Calculate (10) a) Volume flow rate of refrigerant at compressor suction. b) Compressor discharge temperature.
- 13. A plant using R-134a is used to chill water for warship systems. The condenser is also cooled by water. Assume no undercooling in the condenser. The following data is to be used: 50L/s Water flowrate through evaporator Water inlet temperature to evaporator Water outlet temperature from evaporator -10°C 20°C 140L/s 350kPa 1100kPa Water flowrate through condenser Compressor suction pressure Compressor discharge pressure Compressor suction temperature Compressor discharge temperature Specific heat capacity of water Calculate: -10°℃ 60°C 4.2kJ/kgK a. Coefficient of Performance b. refrigerant cooling load c. refrigerant mass flowrate d. compressor power e. heat removed in condenser f. temperature change in condenser cooling waterThe output of a compressor plant delivering 600 m3 of free air/hr at 7 bar gauge at 20 oC passes through arefrigeration type dehumidifier where it is cooled to 1 oC. How much water should be collected from thedehumidifier per hour ?Please choice one below:a. 5.124 kg/hrb. 0.909 kg/hrc. 0.408 kg/hrd. 3.275 kg/hre. 1.317 kg/hrqThe Rheem RA1724AJ2 residential air conditioner provides 24,000Btu/hr total cooling capacity and delivers a claimed EER of 12.20 which indicates a COP of 3.57 rather than the actual refrigerant, assume that R-134a is the working fluid and that the compressor inlet and exit conditions are as shown a)What is the power (in kW) required for the specified cooling b)What is the refrigerant mass flow rate needed given the compressor inlet and exit conditions?