! Required information A steady-flow Carnot refrigeration cycle uses refrigerant-134a as the working fluid. The refrigerant changes from saturated vapor to saturated liquid at 46.00°C in the condenser as it rejects heat. The evaporator pressure is 180 kPa. Determine the amount of heat absorbed from the refrigerated space. Take the required values from saturated refrigerant-134a- Temperature table. (You must provide an answer before moving on to the next part). (Round the final answer to three decimal places.) The amount of heat absorbed from the refrigerated space is [ kJ/kg.

! Required information A steady-flow Carnot refrigeration cycle uses refrigerant-134a as the working fluid. The refrigerant changes from saturated vapor to saturated liquid at 46.00°C in the condenser as it rejects heat. The evaporator pressure is 180 kPa. Determine the amount of heat absorbed from the refrigerated space. Take the required values from saturated refrigerant-134a- Temperature table. (You must provide an answer before moving on to the next part). (Round the final answer to three decimal places.) The amount of heat absorbed from the refrigerated space is [ kJ/kg.

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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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
3. When subcooling the liquid refrigerant:a. the refrigerating effect per unit mass increases. b. the mass rate of flow per unit capacity decreases. c. the volume flow rate per unit capacity decreases. d. the work of compression per unit mass remain the same. e. the COP increases. f. the theoretical power per unit capacity decreases. A simple saturated refrigeration cycle for R-12 system operates at an evaporating temperature of - 5oC and condensing temperature of 40oC. Show the effect from a to f if the liquid refrigerant is subcooled to 30 oC.
An ideal vapor-compression refrigeration cycle with refrigerant-134a as the working fluid is maintains a condenser at 1000 Kpa and the evaporator 40C. Determine the COP and the amount of power required to service a 400 KW cooling load.
B-Draw the ideal vapour compression refrigeration cycle on T-S and P-H diagrams. State all details on the diagrams and give a short explanation of each process of the cycle.
! Required information NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. Consider a two-stage cascade refrigeration cycle with a flash chamber as shown in the figure with refrigerant-134a as the working fluid. The evaporator temperature is −10°C and the condenser pressure is 1600 kPa. The refrigerant leaves the condenser as a saturated liquid and is throttled to a flash chamber operating at 0.45 MPa. Part of the refrigerant evaporates during this flashing process, and this vapor is mixed with the refrigerant leaving the low-pressure compressor. The mixture is then compressed to the condenser pressure by the high-pressure compressor. The liquid in the flash chamber is throttled to the evaporator pressure and cools the refrigerated space as it vaporizes in the evaporator. The mass flow rate of the refrigerant through the low-pressure compressor is 0.11 kg/s. Assume that the refrigerant leaves the evaporator as a saturated vapor…
Required information NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. Consider an ice-producing plant that operates on the ideal vapor compression refrigeration cycle and uses refrigerant-134a as the working fluid. The refrigeration cycle operating conditions require an evaporator pressure of 180 kPa and the condenser pressure of 1400 kPa. Cooling water flows through the water jacket surrounding the condenser and is supplied at the rate of 250 kg/s. The cooling water has a 10°C temperature rise as it flows through the water jacket. To produce ice, potable water is supplied to the chiller section of the refrigeration cycle. For each kg of ice produced, 333 kJ of energy must be removed from the potable water supply. (Take the required values from saturated refrigerant-134a tables.) Determine the mass flow rate of the potable water supply, in kg/s. The mass flow rate of the potable water supply iskg/s.
Working fluid is Refrigerant 134a. Vapor-compression refrigeration system has refrigerating capacity = 1650 Btu/hour. Refrigerant enters evaporator at -10F and leaves at 15F. Isentropic compressor efficiency = 74%. Refrigerant condenses at 140F and leaves condenser subcooled at 100F. No large pressure drops through evaporator and condenser. DETERMINE: 1. Pressure of evaporator in lbf/in^2 2. Pressure of condenser in lbf/in^2 3. Mass flow rate in lb/s of refrigerant 134a. 4. Power input in horsepower of compressor. 5. Coefficient of performance.