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 and the isentropic efficiency is 86 percent for both compressors. (Take the required values from saturated refrigerant-134a tables.)

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 and the isentropic efficiency is 86 percent for both compressors. (Take the required values from saturated refrigerant-134a tables.)

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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Avapor-compression refrigeration system with a capacity of in = 10 tons has Refrigerant 134a as the working fluid. Information and data for the cycle are provided in figure and in the table below. The compression process is internally reversible and can be modeled by pu¹1 = 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. State 1 2 3 4 5 6 T₁=44°C P3-11.,6 bar 4 12 T₁=20°C 7₁=30°C T P (bar) (°C) 3 15 11.6 3 Expansion valve 79.95 44 Condenser 20 30 6 Evaporator 0.6709 0.02151 P₂ = 12 bar Compressor U h S (m²/kg) (kJ/kg) (kJ/kg-K) 0.07232 260.8 0.9656 |T₁= 15°C 0.02051 310.2 0.0008847 112.2 82.88 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. 1.019 112.2 0.4241 0.4054 0.2928 125 0.4341 (c) the coefficient of performance. (d) the mass flow rate of the cooling water, in…
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…
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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 and…
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An ideal vapor-compression refrigeration cycle that uses refrigerant-134a as its working fluid maintains a condenser at 800 kPa and an evaporator at -18°C. Determine this system's COP and the amount of power required to service a 100 kW cooling load. (Take the required values from saturated refrigerant-134a tables.) 3 4 Warm environment OH Condenser Expansion valve Evaporator QL Cold refrigerated space The amount of power required is ↑ (2) in Compressor 1 kW, and the COP of the system is
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Thermodynamics: 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.
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 and…
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