Elements Of Electromagnetics
7th Edition
ISBN: 9780190698614
Author: Sadiku, Matthew N. O.
Publisher: Oxford University Press
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- Consider the following ideal cascade refrigeration system with pressures of 0.9, 0.4, and 0.12 MPa.If the lower cycle transfers 69kW of energy to the upper cycle, determine the mass flowrate of R-134A (in kg/s) in the upper cycle. a.0.3987 b.0.4114 c.0.3600 d.0.4480arrow_forward4. An ammonia refrigerating plant operates between pressure limits of 10.34 bar and 2.265 bars. The refrigerant leaves the evaporator as a vapor 0.95 dry and leaves the condenser as a saturated liquid. If the refrigerant mass flow rate is 4 kg/min, find the cooling load. 65.3 kW O 70.5 kw O 75.52 kw O 52.5 kWarrow_forward2.3 A vapour compression refrigeration cycle operates between the condensation temperature of 20°C and evaporator temperature of –10°C with carbon dioxide as refrigerant. Temperature after isentropic compression is 40°C and condensate leaves at 10°C before being passed through expansion valve. Determine 2.3.1 COP of system and 2.3.2 mass flow rate of CO2 required to get refrigeration effect of 2 kW.arrow_forward
- AC/ pump analysis System 2 tons operating steadily to maintain 60 F inside. Temperature outside: 30 F Assume 10 degree temp difference between the refrigerant R-134a and the two thermal reservoirs with which the refrigerant exchanges heat. COP = 9.0 Determine: compressor efficiency (%), condenser pressure (psia), evaporator pressure (psia), mass flow rate of R-134a (lb/sec)arrow_forwardA refrigeration system with a capacity of 10 tons of refrigeration, operates at 210 kPa in the evaporator, while in the condenser it is 800 kPa. If R-134a refrigerant is in a saturated state, calculate the theoretical power required to operate the compressor. Compressor power = .... kWarrow_forwardA vapour-compression refrigeration system operates with Refrigerant 134 with two evaporators with varying cooling capacity. The low temperature evaporator (#1) operates at -20°C with saturated vapour at its exit and has a refrigeration capacity of 3 tons. The higher temperature evaporator (#2) produces saturated vapour at 3.6 bar at its exit and has a refrigerating capacity of 2 tons. Compression is isentropic to the condenser pressure of 12 bar. There are no pressure drops in the flow through the condenser and the two evaporators and the refrigerant leaves the condenser as saturated liquid at 12 bar. Determine: The mass flow rate of the refrigerant in kg/s through each evaporators;The power input for the compressor, in kW;The coefficient of performance of this refrigeration system;The heat transfer through the condenser in kW;The rates of exergy destruction in each expansion valves in kW for T0 = 300K;Draw the T-s diagram of this system.arrow_forward
- An ammonia refrigeration compressor takes its suction from the evaporator, at a temperature of-200F and a quality of 95%. The compressor discharges at a pressure of 100 psi, liquid ammonia leaves the condenser at 500F.(a)Determine the heat absorbed by the evaporator in kJ/kg. (b)Determine the heat rejected to the condenser in kJ/kg. (c)Determine the COP. (d)Determine the horsepower per ton of refrigeration. (e)Determine the quality of refrigerant upon entering to the evaporatorarrow_forwardThermo 1 Pls kindly help me asaparrow_forwardPlease provide steps an solution.arrow_forward
- 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 harrow_forwardAn ammonia simple vapor operator between evaporator and condenser temperature of 20 C and 35 C respectively. the system used introducing 5000kg of sec in 20 hours. a 100x200 mm compressor with a compressor efficiency of 80% and electric input to the motor driving the compressor is 14 kw motor efficiency is 90%, determine heat, (b) work indicated (c) brake work (d) mechanical efficiencyarrow_forwardThermodynamics: A refrigeration unit using Refrigerant-134a is used to maintain a certain space at –15°C. The condenser rejects heat (?H) to cooling water that enters the condenser at 15°C at a rate of 0.2 kg/s and leaves at 35°C (all as saturated liquid water). The superheated refrigerant enters the condenser at 0.8 MPa and 40°C and leaves as a saturated liquid at the same temperature. If the compressor consumes 4.5 kW of power, determine (a) the mass flow rate of the refrigerant, (b) the refrigeration load (?̇L), (c) the COP.arrow_forward
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