A refrigerator operates on a non-ideal rankine cycle. Leaving the evaporator, the refrigerant is at 180 kPa and -10 C. It enters a compressor with an isentropic efficiency of 53.906% and leaves at .7 MPa. The condenser operates at .7 MPa at beginning and end with the refrigerant leaving at 37.71 C. Determine a. The coefficient of performance of this refrigerator
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- Condensers in these refrigerators are all_______cooled.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/kg1. A refrigeration system operates on an ideal vapor compression using R-12 with an evaporator temperature of -30°C and condenser exit temperature of 49 30 °C and requires 74.6 kW motor to drive the compressor. What is the capacity of the refrigerator in tons of refrigeration? Enthalpy at condenser entrance = 382 kJ/kg, exit = 248.15 kJ/kg, at evaporator entrance 248.15 KJ/kg, exit = 338.14 kJ/kg.
- A refrigeration system operated on an ideal vapor-compression using R-12 with a vaporizing temperature of -10 degrees Celsius and a condensing temperature of 30 degrees Celsius, it requires 15 hp to drive the motor of the compressor. Find the ff: Enthalpies at each point of the cycle in kJ/kg Refrigerating Capacity in TOR • Mass of the Refrigerant in kg/s Percent Quality in the mixture Heat Rejected in kW Coefficient of Performance • Schematic and P-h DiagramExample 2: Refrigerant R-134a enter the compressor of a has a refrigerantor a superheared vapor at 0.14MPa and -10°C at arate of 0.05kg/sec and leave at 0.8Mp and 50°C.The refrigerant cooled in the condenser to 26°C and 0.72Mpa is throttled to 0.15MPa.Disregradingany heat transfere and pressure drop in the connecting line between the components. Determine: a) The rate of heat removed from the refrigerated space b) The power input to the compressor. c) Isentropic eff of the compressor d) COP of the refrigerantor.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
- Just to check the answer no need calculationStep: Evaluate the performance of Refrigerator 2.Refrigerator 2 is a refrigerator that operates as an ideal vapor refrigeration cycle, and uses theSame refrigerant and evaporation and condensing temperatures as Refrigerator 1.In Cooler 2, the working fluid must be admitted by the compressor only in the form of vaporsaturated, and must leave the compressor in the form of superheated steam with enthalpy equal to 1640 kJ/kg.Differently from Refrigerator 1, the cycle operates with an expansion valve (isenthalpic process).For this 2nd step, you must determine the following design parameters:a) The rate of cooling and the rate of heat rejection in the condenser.b) The power of the compressor;c) The COP of the cycle.For the energy balance, make the following considerations:- Permanent regime;- Variation of kinetic and potential energy are negligible;- Compressor and expansion valve operate adiabatically;- Evaporation and condensation steps do not involve work. Please, make it typeable,…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.
- In a cascade refrigeration system,the compressor power in the low and high pressure loop are 13 kw and 10 kw, respectively.Find the mass flow rate of cooling water in the condenser for a temp increase of 19°℃, if COP is 5.2. An ideal refrigeration cycle that has a condenser temperature of 25°C and an evaporator temperature of -25°C. Compute for the work input to the compressor, heat absorbed by the evaporator from the cold space, heat released to the hot space, and the COP of this refrigerator for the working fluid R-410a. Equations: Efficiency of a turbine: W,(actual) H2.actual – H1 W,(isentropic) H2.isentropic - H, Efficiency of a compressor: W,(isentropic) H2isentropic – H1 = W,(actual) H2actual – H1 Rankine cycle efficiency: Wnet_ |Wturbinel - |Wpump| Qboiler COP of a refrigerator: Q¿(heat absorbed from cold space) B Wc(work input to the compressor) Thermodynamic tables: Water Van Ness – Page 681 Sonntag – Page 776 R-134a Sonntag – Page 810An r-134a refrigerator operates a simple vapor compression cycle (SVCC). The evaporatoroperates at -10 °C, while the condenser operates at 1 MPa. R-134a flows around the system at 10 g/s.a. Graph the cycle in a P-h diagram and calculate the temperature at the exit of the compressor, assuming it is 100% isentropicallyefficient.b. Calculate the power required by the compressor (in W) and the cooling effect of the refrigerator (in kW) c. Compute for the COP of the system. What is its percent difference from the reversible efficiency?