Q31 An ideal vapor-compression refrigeration cycle works on R-12 and operates between (42 °C and -5C saturation conditions). the exit of the compressor (h₂) is at superheated conditions at 390 kPa and entropy S = 1.562 kJ/kg.K. 1- Draw the cycle on T-S diagram. 2- Calculate the refrigeration effect. 3- The heat removed to the environment. h2 S2 P2 12 P2= R3 51=32 17 marks) 4- The work supplied to the compressor. 52 = 5.1. R
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- Welded ______sealed compressors are normally used in household refrigerators.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.A refrigerator operating using vapor-compression cycle uses R-134a as a working fluid. The condenser temperature is 65oC and the evaporator temperature is -15oC. The compressor operates at 80% efficiency. a. Determine the coefficient of performance of the refrigeration cycle. b. How much refrigerant is needed to deliver 3 kW of cooling? c. Sketch the vapor compression cycle indicating the states of each stream (in terms of H, P, T, and S) and showing the values of energy input/output in the system d. Suppose that we replace the expansion valve in the vapor- compression cycle with a turbine that operates at 80% efficiency. Determine the coefficient of performance of the refrigeration cycle. Provide the new state properties (i.e. H, P, T and S) for this changes Please use CATT for any values needed
- With ph, ts diagram A refrigerator based on ideal vapor compression cycle operates between the temperature limits of -20 deg C and 40 deg C . The refrigerant enters the condenser as saturated vapor and leaves as saturated liquid . The enthalpy and entropy values for saturated liquid and vapor at these temperatures are given in the table below: T(OC) hf (KJ/kg) hg (KJ/kg) Sf (KJ/kg.K) Sg (KJ/kg.K) -20 20 180 0.07 0.7366 40 80 200 0.3 0.67 If the circulation rate of the refrigerant is 0.025 kg/sec , the refrigeration effect is equal to A) 1.2 kW B) 2.5 kW C) 3.2 kW D) 2.1 kWThe evaporator and condenser is isobaric with a net heat transfer 250 W in a vapor-compression refrigeration cycle. The cycle operates with R-134a working fluid at a steady state. The compressor's isentropic efficiency is at 60% with a high pressure of 16 bar and low pressure of 1 bar during the cycle. Solve for the mass flow rate, coefficient of performance, and draw the T-s diagram.3.23: An ideal refrigeration cycle operates with R134a as the working fluid. The temperature of refrigerant in the condenser and evaporator are 40°c and -20°c respectively. The mass flow rate of refrigerant is 0.1 kg/s. Determine the cooling capacity and cop of the plant. Take enthalpy of refrigerant vapour at the end of compression as 276 kJ/kg. 40°C 2 -20°C/ 3 40°C -20°C h
- Q.13 A vapour compression refrigeration system using refrigerant F-12 is employed to produce 8640 kg of ice per day. The condensing and evaporating temperature of refrigcrant are 48°C and-20°C respectively. Saturated liquid leaves the condenser and saturated vapour leaves the evaporator. Compression is isentropic, water at 35°C is used to form the ice. The temperature of ice should be-8°C. Heat flow into the brine tank from surroundings may be taken as 10% of total heat absorbed from water to form ice. Determine the power required to drive the compressor. Take specific heat of ice 2.26 kJ/kg-K. Latent heat of ice = 335 kJ/kg. Specific heat of water = 4.2 kJ/kg-K. The following data may be used: %3D Temp. Pressure Enthalpy Entropy °C bar kJ/lg kJ/kg-K Liquid Vapour Liquid Vapour 48°C 11.64 82.83 205.83 0.2973 0.6802 -20 1.51 17.82 178.74 0.0731 0.7087 Specific heat of vapour 0.82 kJ/kg %3DA split air conditioning unit operating on vapor compression cycle uses Refrigerant (R-134a). The various state points of refrigerant (R-134a) are shown on the TS diagram. Determine the following a) The refrigerating effect 3 (b) Compressor work 3 (c) The heat rejected in the condenser 2 (d) The COP of heating 2 (e) The tonnage capacity of the unit for the refrigerant mass flow of 0.025 Kg/s.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/kg