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- A vapor- compression refrigeration system with two evaporators using Refrigerant 134a as the working fluid. This arrangement is used to achieve refrigeration at two different temperatures with a single compressor and a single condenser. The low- temperature evaporator operates at -18 oC with saturated vapor at its exit and has a refrigerating capacity of 3 tons. The higher-temperature evaporator produces saturated vapor at 3.2 bar at its exit and has a refrigerating capacity of 2 tons. Compression is isentropic to the condenser pressure of 10 bar. There are no significant pressure drops in the flows through the condenser and the two evaporators, and the refrigerant leaves the condenser as saturated liquid at 10 bar. Sketch the process on a T-s diagram and Calculate; the mass flow rate of refrigerant through each evaporator, in kg/min the compressor power input, in kW the rate of heat transfer from the refrigerant passing through the condenser, in kW.The working fluid of a liquid-vapor cycle is 1kg of R-134a. The cycle operates between two pressures 100kPa and 1200kPa. • Process A-B: An isobaric compression at the high pressure to a saturated liquid. • Process B-C: An iso-entropic process from the high pressure to the low pressure. • Process C-D: An isobaric expansion at the low pressure to a saturated vapor. • Process D-A: An iso-entropic process from the low pressure to the high pressure. a) Make a table of the temperature, pressure, volume, internal energy, enthalpy, entropy and quality factor (T, P, V, U, H, S & x) at the start of each process. b) Make a table of the change in internal energy, heat flow, work done, change in enthalpy, and change in entropy (AU, Q, W, AH, AS) during each leg of the cycle. c) Draw well-labelled P-V & T-S diagrams (indicating lines of constant pressure, the saturation dome, heat flow, work, etc.) d) Calculate the coefficient of performance of the cycle (Q₁ / W).developing 60kw of refrigeration using refrigerant R134a with condensing temperature 400C and evaporating -30 oC vapor is superheated before entering the compressor by 5 oC while the liquid will be sub-cooled by 6 oC, CalculateThecoefficient of performance and The total work done in the cycle and The mass flow rate of the refrigerant
- Carnot cycle heat pump utilizes R-134a as the working fluid. Heat is transferred from the fluid at 100 F, and during this process the refrigerant changes from saturated vapor to saturated liquid. Heat transfer for the refrigerant takes place at 20 F. You are asked to do the following: (a) Show and describe the cycle on a T-s diagram (b) Calculate the quality at the beginning and at the end of the isothermal process at 20 F (c) Determine the coefficient of performance for the cycle.A refrigerator uses R-134a as its working fluid and operates on an ideal vapor- compression refrigeration cycle that uses an expansion valve (throttling device). The refrigerant evaporates at -20°C and condenses at 1.4 MPa. This unit serves a 15-kW cooling capacity. Determine the mass flow rate of the refrigerant, in kg/s.A heat pump operates with Refrigerant 134a as the working fluid. You are required to analyze its performance, and compare it with Camot heat pump. The data of the heat pump is as under: 23 - Thermodynamies-II Page 1 of 3 The heat pump is presently providing heating at a rate of 12 kW to maintain the interior of a building at 20°C. Outside temperature is 5°C. The refrigerant enters the compressor at 2.4 bar and increases the pressure to 8.0 bar. Efficiency of the compressor is 80%. a Temperatures at the principal states of the cycle, each °C b. Power input to the compressor, in kW c. Coefficient of performance Relate its performance with the specifications provided by the vendor i.e. COP = 8.5 and identify the possible reasons of differences. Draw Ts diagram
- The working fluid of a liquid-vapor cycle is 1kg of R-134a (Hint: Use the R-134a thermodynamic tables.) The cycle operates between two pressures 100kPa and 1000kPa. Process A-B: An isobaric compression at the high pressure from a saturated vapor to a saturated liquid. • ProcessB-C: An iso-entropic process from the high pressure to the low pressure. • Process C-D: An isobaric expansion at the low pressure. •Process D-A: An iso-entropic process from the low pressure to the high pressure. •a) Make a table of the temperature, pressure, volume, internal energy, enthalpy, entropy and quality factor (T, P, V, U, H, S & x) at the start of each process. b) Make a table of the change in internal energy, heat flow, work done, change in enthalpy, and change in S) during each leg of the cycle.AH, AU, Q, W, Aentropy (c) Draw a well-labeled T-S diagram (indicating lines of constant pressure and the saturation dome.) d) Calculate the coefficient of performance of the cycle "nglish (United States)Condenser a steam power plant that operates on a simple ideal ranking cycle and has a net power output of 22MW. Steam enters the turbine at 7Mpa and 450.05°C and is cooled in the condenser at a pressure of 10kpa by running cooling water from a lake through the tubes of the condenser at rate of 1750 kg/s. Determine the mess flow rates of steam through the steam turbine assuming that the cp of superheated steam is 2.9593kJ/kg.K.2 kg of air as an ideal gas undergoes a Carnot refrigeration cycle as shown in the figure. The isothermal expansion occurs at 300K and isothermal compression occurs at 600K. The heat transfer to air during isothermal expansion is 125 kJ. Pressure at the end of isothermal expansion is 75 kPa. 4 TH 1 TL 2 Evaluate work during each step of the cycle.
- Refrigerant ammonia enters the compressor of a refrigerator as superheated vapor at 0.14 MPa, -20°C at a rate of 0.04 kg/s, and leaves at 0.8 MPa, 50°C. The refrigerant is cooled in the condenser to 0.75 MPa and is throttled to 0.14 MPa. Disregarding any heat transfer and pressure drops in the connecting lines between the components, determine the rate of heat removal from the refrigerated space. kW3.23: 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 hProblem 2 – Heat Pump Thermodynamic Analysis Refrigerant-134a enters the condenser of a residential heat pump at 800 kPa and 50°C at a rate of 35 L/min and leaves at 750 kPa subcooled by 3°C. The refrigerant enters the compressor at 200 kPa superheated by 3°C. Neglecting changes in kinetic and potential energy and any stray heat transfer, please answer the following. a. Create a schematic of the cycle, use the same numbers used in your textbook for the inlet and exit states of each device, and include the energy exchanges between the cycle devices and the surroundings. b. Sketch the cycle processes on a T-s diagram. c. Determine the isentropic efficiency of the compressor. d. Compute the rate of heat supplied to the heated room. e. Determine the COP of the heat pump.