The property data for a steady state vapor-compression refrigeration cycle with refrigerant 134a as the working fluid aregiven in the table below. The refrigeration capacity of the cycle is 9.4 tons and the refrigerant mass flow rate is 12.4 kg/min.Determine the net changes in flow exergy rate of the refrigerant passing through the evaporator A (Ed) evap and condenserA(Ed) cond, both in kW. Let po = 1 bar, To = 24°C.(a) A (Ed) evap= Ex: 7.77kW(b) A (Ed) cond= Ex: 0.999kWT3, P3 = P2==Qout32State p (bar) T (°C) h (kJ/kg) s (kJ/kg. K)wwwP21 1.4-10.0 243.40.960627.064.0 300.81.030337.024.0 82.900.311341.4-18.8 82.900.33014==ExpansionvalveP4 PlEvaporatorwwCondenserCompressorWT₁, Pim

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Answered: The property data for a steady state…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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A vapor-compression refrigeration system with a capacity of 10 tons has Refrigerant 134a as the working fluid. Information and data for the cycle are provided in the Figure and in the table below. The compression process is internally reversible and can be modeled by pu1.01 = constant. The condenser is water-cooled, with water entering and leaving with a negligible change in pressure. Heat transfer from the outside of the condenser can be neglected. Determine a) the mass flow rate of refrigerant, in kg/s. b) the power input and the heat transfer rate for the compressor, each in kW. c) the coefficient of performance. d) the mass flow rate of the cooling water, in kg/s. e) the rates of entropy production in the condenser and expansion valve, in kW/K. f) the rates of exergy destruction in the condenser and expansion valve, each expressed as a percentage of the compressor power input. Let To = 20°C. State p (bar) 1 4 12 11.6 2 3 4 4 5 6 . T (°C) 15 54.88 44 8.93 20 30 Ty=44°C Py = 11.6 bar…
The cold storage room is maintained at T; = -70 °C by two stage vapor-compression refrigeration unit. In the low temperature cycle, R170 (ethane) is used as the working fluid. In the high temperature cycle, R134a is used as the working fluid. After selecting reasonable pressures for all heat exchangers, calculate evaporator capacity, COP of the system, and compressor powers. Show refrigeration cycles on P-h diagrams uploaded with the midterm exam question sheet. Draw the T-s diagrams of R134a and R170 cycles as well. Draw schematic of refrigeration system with its components. Notes ÜLI 1) Isentropic efficiency of compressors are 0.75. 2) Refrigerants leave the condensers as saturated liquid and exit from the evaporators as saturated vapor. 3) When determining the cooling requirement, only the wall conduction load will be taken into account. |(consider 5 walls, neglect heat loss through the floor) 4) The inner and outer walls are normally covered with steel sheets, but their conduction…
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The cold storage room is maintained at T; = -70 °C by two stage vapor-compression refrigeration unit. In the low temperature cycle, R170 (ethane) is used as the working fluid. In the high temperature cycle, R134a is used as the working fluid. After selecting reasonable pressures for all heat exchangers, calculate evaporator capacity, COP of the system, and compressor powers. Show refrigeration cycles on P-h diagrams uploaded with the midterm exam question sheet. Draw the T-s diagrams of R134a and R170 cycles as well. Draw schematic of refrigeration system with its components. Notes UL 1) Isentropic efficiency of compressors are 0.75. 2) Refrigerants leave the condensers as saturated liquid and exit from the evaporators as saturated vapor. 3) When determining the cooling requirement, only the wall conduction load will be taken into account. (consider 5 walls, neglect heat loss through the floor) 4) The inner and outer walls are normally covered with steel sheets, but their conduction…
A vapor-compression refrigeration cycle with Refrigerant 134a as the working fluid operates with an evapo-rator temperature of 50◦F and a condenser pressure of 180 lbf/in2Saturated vapor enters the compressor. Refrigerantenters the condenser at 140◦F and exits as saturated liquid. The cycle has a refrigeration capacity of 5 tons (a) the refrigerant mass flow rate, in lb/min. b) the compressor isentropic efficiency. (c) the compressor power, in horsepower. (d) the coefficient of performance.
The LiBr-water absorption cycle shown in the Fig. operates at the following temperatures: generator, 105 C; condenser, 35 C; evaporator, 5 C; and absorber, 30°C. The flow rate of solution delivered by the pump is 0.4 kg/s. (a) What are the mass flow rates of solution returning from the generator to the absorber and of the refrigerant? (b) What are the rates of heat transfer at each of the components, and the COP? High-pressure vapor Solution 105 Generator Heat Pump Monog Heat Condenser Throttling Expansion valve valve Low-pressure vapor Heat Absorber Evaporator Heat
Refrigerant 22 is the working fluid in a Carnot vapor refrigeration cycle for which the evaporator temperature is -30°C. Saturated vapor enters the condenser at 36°C, and saturated liquid exits at the same temperature. The mass flow rate of refrigerant is 10 kg/min. Determine the quality of refrigerant at inlet of compressor,
The 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.
The figure below shows a two-stage vapor-compression refrigeration system with ammonia as the working fluid. The system uses a direct-contact heat exchanger to achieve intercooling. The evaporator has a refrigerating capacity of 40 tons and produces -30°F saturated vapor at its exit. In the first compressor stage, the refrigerant is compressed adiabatically to 140 lbf/in.², which is the pressure in the direct contact heat exchanger. Saturated vapor at 140 lbf/in.² enters the second compressor stage and is compressed adiabatically to 250 lbf/in.² Each compressor stage has an isentropic efficiency of 85%. There are no significant pressure drops as the refrigerant passes through the heat exchangers. Saturated liquid enters each expansion valve. Determine: Expansion valve 6- Condenser Direct contact heat exchanger Expansion valve (a) the ratio of mass flow rates, m3/my. (b) the power input to each compressor stage, in horsepower. (c) the coefficient of performance Comp Comp Evaporator
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Data for steady-state operation of a vapor-compression refrigeration cycle with Refrigerant 134a as theworking fluid are given in the table below. State 1 is at the compressor inlet. The cooling capacity (i.e therate at which heat is removed from the cooled space) is 4.6 tons. 1 ton of refrigeration is equivalent to211 kJ/min. Ignoring heat transfer between the compressor and its surroundings, sketch the ?-? diagramof the cycle and determinea) the mass flow rate of the refrigerant, in kg/min.b) the isentropic compressor efficiency.c) the coefficient of performance.State ? (bar) ? (°C) ℎ (kJ/kg) ? (kJ/kg-K)

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