**Educational Content on Refrigeration Cycle**### OverviewThis section provides a detailed explanation of a commercial refrigeration system using refrigerant-134a. The system is designed to maintain a refrigerated space at a temperature of -35°C by expelling waste heat to cooling water.### System Description- **Refrigerant:** R-134a- **Refrigerated Space Temperature:** -35°C- **Condenser Water Inlet Temperature:** 18°C- **Condenser Water Outlet Temperature:** 26°C- **Cooling Water Mass Flow Rate:** 0.35 kg/s- **Condenser Pressure:** 1.2 MPa- **Condenser Temperature:** 50°C, subcooled by 5°C- **Compressor Power Consumption:** 3.3 kW### Diagram ExplanationThe refrigeration cycle consists of four main components, depicted in the schematic diagram:1. **Compressor:** - Increases the pressure and temperature of the refrigerant. - Power input required is 3.3 kW.2. **Condenser:** - Heat exchange occurs here where hot refrigerant gas is cooled by water. - Enters at 1.2 MPa and 50°C, with water entering at 18°C and leaving at 26°C.3. **Expansion Valve:** - Reduces the pressure and temperature of the refrigerant, preparing it for the evaporator.4. **Evaporator:** - Absorbs heat from the space to be cooled. - Refrigerant transitions from a liquid to a gas.### Task**Objective:** Determine the mass flow rate of the refrigerant within the system.**Calculations:**- Use thermodynamic tables and the provided conditions to calculate the mass flow rate in kg/s.**Question:**- Determine the mass flow rate of the refrigerant.**Answer Box:** - The mass flow rate of the refrigerant is _____ kg/s.This setup allows students to explore the application of thermodynamic principles in refrigeration and helps them calculate key parameters for efficient system operation.

Answered: Image /qna-images/answer/954927ed-ac28-43ae-bf57-a70094b0a574.jpg

A commercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at -35°C by rejecting waste heat to cooling water that enters the condenser at 18°C at a rate of 0.35 kg/s and leaves at 26°C. The refrigerant enters the condenser at 1.2 MPa and 50°C and leaves at the same pressure subcooled by 5°C. The compressor consumes 3.3 kW of power. Use data from the tables. 26°C 1.2 MPa 5°C subcooled Expansion valve Condenser Evaporator 2₁ Water 18°C 1.2 MPa 50°C Compressor Determine the mass flow rate of the refrigerant. (You must provide an answer before moving to the next part.) The mass flow rate of the refrigerant is kg/s.

A commercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at -35°C by rejecting waste heat to cooling water that enters the condenser at 18°C at a rate of 0.35 kg/s and leaves at 26°C. The refrigerant enters the condenser at 1.2 MPa and 50°C and leaves at the same pressure subcooled by 5°C. The compressor consumes 3.3 kW of power. Use data from the tables. 26°C 1.2 MPa 5°C subcooled Expansion valve Condenser Evaporator 2₁ Water 18°C 1.2 MPa 50°C Compressor Determine the mass flow rate of the refrigerant. (You must provide an answer before moving to the next part.) The mass flow rate of the refrigerant is kg/s.

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 heat pump uses R134a as refrigerant. The refrigerant flows into the condenser at 900 kPa and 60°C and flows out of it (the condenser)as saturated liquid at the same pressure. The pressure in the evaporator is 70 kPa. The mass flow of the refrigerant is 0.025 kg/s and the compressor power is 1.4 kWa) Calculate the heat pump's power factor, COPHP.b) Calculate how much heat is absorbed/taken up from the air outside.c) Calculate the vapor quality of the refrigerant into the evaporator.
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Refrigerant-134a enters the compressor of a refrigerator as superheated vapor at 0.14 MPa and -10oC at rate of 0.05 kg/sec and leave at 0.8 MPa and 50oC. The refrigerant is cooled in the condenser to 26oC and 0.72MPa and is throttled to 0.15MPa. Determine (a) the rate of heat removal from the refrigerated space and the power input to the compressor, (b) the isentropic efficiency of the compressor and (c) the coefficient of performance.
Consider a refrigrator that operates on the vapor compression refrigeration cycle with R-134a as the working fluid. The refrigerant enters the compressor as saturated vapor at 70 kPa, and exits at 1200 kPa and 90°C, and leaves the condenser as saturated liquid at 1200 kPa. The coefficient of performance of this refrigrator is
Ammonia refrigerant circulates in a refrigeration system with one compressor serving two evaporators where one evaporator carries a load of 35 kW at 10°C and the other a load of 70 kW at -5°C. A back pressure valve reduces the pressure in the 10°C evaporator to that of the -5°C evaporator. The condensing temperature is 37°C. Calculate the mass of the refrigerant in kg/s. (Use h₂ = h1 + 203.7586 kJ/kg)
Find the rate at which heat is extracted from the refrigerated space.
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A gas refrigeration system utilizing air as the working fluid possesses a pressure ratio of 3. The air is directed into the compressor at 5°C. The high- pressure air is then cooled down to 40°C by rejecting heat to the ambient environment. The refrigerant exits the turbine at -85°C and subsequently absorbs heat from the cooling area prior to its entry into the regenerator. The mass flow rate of air is 0.45 kg/s. Given that the isentropic efficiencies are 82 percent for the compressor and 87 percent for the turbine, and using constant specific heats at ambient temperature, find: (a) The effectiveness of the regenerator. (b) The rate at which heat is extracted from the cooling area. (c) The Coefficient of Performance (COP) of the cycle.
A vapor compression refrigerator using R134a as the refrigerant operates under the following conditions: The refrigerant condenses at 50°C and is then sub-cooled by 10°C to 30°C before expansion. After an isenthalpic expansion, the refrigerant evaporates at -20°C and then superheated by 10°C to 0°C before compression. The refrigerant is compressed to 70°C with entropy of 1.0 kJ/kg.K at the end of the compression. a)With reference to the above operating conditions, draw the cycle on the R134a p-h diagram. b)Calculate the specific refrigerating effect at the evaporating temperature of -20°C. c)Calculate the work input for the compression process. d)Prove the vapor compression is not an isentropic process. e) Calculate the COP of the cycle. f)To produce 5kW cooling, what is the refrigerant flow rate required?
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