standard vapor compression cycle a condensing temperature of 36 The heat extraction rat
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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.A refrigerator uses refrigerant-134a as the working fluid and operates on the vapor-compression refrigeration cycle. The evaporator and condenser pressures are 100 kPa and 1400 kPa, respectively. The isentropic efficiency of the compressor is 88 percent. The refrigerant enters the compressor at a rate of 0.022 kg/s superheated by 26.37°C and leaves the condenser subcooled by 4.4°C. Problem 11.021.b - Comparison to ideal vapor compression cycle 1) Determine the rate of heat removal from the refrigerated space 2) The rate of heat rejection from the refrigerant to the environment 3) The power input and the COP if the cycle is operated on the ideal vapor-compression refrigeration cycle between the same pressure limits. (Take the required values from saturated refrigerant-134a tables.)The vapor compression heat pump system uses R134a as the working fluid. The inlet conditions of the refrigerant to the compressor are 2.4 bar, 0oC and its volumetric flow rate is 0.6 m3 / min. Compression is adiabatic and lasts up to 9 bar and 60oC conditions. From the condenser The exit conditions (from the condenser) are 9 bars of saturated liquid. Under these conditions; a) Calculate the heating capacity of the system in kW.b) Calculate the heating efficiency coefficient (COPIP) of the system.c) Calculate the adiabatic efficiency of the compressor.
- The ice industry to produce its raw material considers an ideal vapor compression refrigeration cycle with refrigerant 134a as the working fluid due to its advantages ofdriving.The operating conditions of the refrigeration cycle require an evaporator pressure of 140 kPa and a condenser pressure of 1,200 kPa. In addition, there is cooling waterflowing through jackets (small tubes) surrounding the condenser, and is supplied at a rate of 245 kg/s.This cooling water has a temperature rise of 11.7°C as it flows through the water jacket.To produce ice, potable water is injected into the chiller section of the refrigeration cycle (evaporator). For each kg of ice produced, 324 kJ of energy must be removed from the supplied drinking water.a) Determine the mass flow rate of the refrigerant, in kg/s.b) Determine the mass flow rate of the drinking water supply, in kg/s.c) Make the T vr S Diagram, include all the results.A standard vapor compression cycle using R134a as the working fluid has a condensing temperature of 40°C and an evaporating temperature of -5°C. The heat extraction rate is 25 kW. The process 1-2-3-4 describes the cycle with T-s and P-h diagrams shown below.A. Calculate the refrigerant flow rate in kg/s. B. Calculate the compressor work input in kW. C. Calculate the volume flow rate of refrigerant at the compressor inlet in m^3/s. D. Calculate the COP of the cycle. E. Calculate the COP of a Carnot refrigerator operating between the same temperatures.A standard vapor compression cycle using R-134a as the working fluid has a condensing temperature of 40°C and an evaporating temperature of -5°C. The heat extraction rate is 25 kW. Calculate: a.) The refrigerant flow rate in kg/s.b.) The compressor work input in kW.c.) The volume flow rate of refrigerant at the compressor inlet in m^3/s.d.) The COPe.) The COP of a Carnot refrigerator operating between the same temperatures.
- A 1050 kPa-boiler is rated at 77,000 kW in a Rankine cycle at which the turbine’s pressure in the cycle is reduced to 20 kPa. The condensation of the saturated steam is carried out using cooling water (Cp=4.18 kJ/kg °C) which enters the condenser at 14°C and leaves it at 88oC . Determine: the turbine’s inlet temperature (in K) the thermal efficiency of the cycle using the net amount of work of the cycle. The flow rate of the cooling water (kmol/s) Number the cycle clockwise with the turbine’s inlet stream as state 1An ideal vapor-compression refrigeration cycle that uses refrigerant-134a as its working fluidmaintains a condenser at 800 kPa and the temperature of the evaporator is -15 C. Given 300 kW ofcooling load, determine the following:3. Estimate the reversible COP values, if the low and high medium temperatures are as for theevaporator and condenser.4. Determine the Refrigeration effect (RE), heat of compression (HOC), and heat of rejection(HOR) and their corresponding rate/power values in kW.5. Estimate the COPR using thermodynamic tables and Calculate the COPR using the P-h chart and show the refrigeration cycle on the p-h chart.Consider a steady-flow Carnot refrigeration cycle that uses refrigerant-134a as the working fluid. The maximum and minimum temperatures in the cycle are 30 and -20C, respectively. The quality of the refrigerant is 0.15 at the beginning of the heat absorption process and 0.80 at the end. Show the cycle on a T-s diagram relative to saturation lines, and determine (a) the coefficient of performance, (b) the condenser and evaporator pressures, and (c) the net work input.
- . A steady-flow Carnot refrigeration cycle uses refrigerant-134a as the working fluid. The refrigerant changes from saturated vapor to saturated liquid at 608C in the condenser as it rejects heat. The evaporator pressure is 140 kPa. Show the cycle on a T-s diagram relative to saturation lines, and determine (a) the coefficient of performance, (b) the amount of heat absorbed from the refrigerated space, and (c) the net work input.What is the heat transfer rate at the condenser in an actual power cycle of 100,000 kW rating with turbine efficiency of 0.80 and having steam fed up in a turbine at 7500 kPa and 450 C. The steam going out of the turbine is at 24 kPa. The condenser produces saturated liquid. Assume negligible pump work.An ideal vapor-compression refrigeration cycle that uses refrigerant-134a as its working fluid maintains a condenser at 800 kPa and the evaporator at 15 kPa. Given 300 kW of cooling load, determine the following: 3. Estimate the reversible COP values, if the low and high medium temperature are as for the evaporator and condenser. 4. Determine the Refrigeration effect (RE), heat of compression (HOC), and heat of rejection (HOR) and their corresponding rate/power values in kW. 5. Estimate the COPR using thermodynamic tables 6. Calculate the COPR using the P-h chart and show the refrigeration cycle on the p-h chart.