# Refrigeration System DesignA refrigeration system is to be designed to maintain the temperature in the range of -15°C to -5°C, while the outside temperature varies from 15°C to 25°C. The total thermal load on the storage unit is given as 20 kW. Obtain an initial design for the vapor compression refrigeration system shown below. For safe operation and other factors, such as additional energy transfer, design the system using a safety factor of 1.3 such that Q_L = 26 kW. The compressor efficiency could range from 60 to 80 percent.**This is to be completed individually. It would be highly unlikely for multiple students to select all the same design parameters in part (a).**## Diagram ExplanationThe diagram illustrates a basic vapor compression refrigeration cycle, consisting of four main components:1. **Evaporator**: Absorbs heat (Q_L) from the refrigerated space.2. **Condenser**: Releases heat (Q_H) to the surroundings.3. **Expansion Valve or Capillary Tube**: Reduces the refrigerant pressure and temperature.4. **Compressor**: Compresses the refrigerant to a high-pressure, high-temperature state while doing work.## Design TasksAs part of the design, you should:a) **Specify and justify the constraints** (isentropic efficiency, condenser, and evaporator temperature) you chose.b) **Show the cycle in relation to the two-phase region on a temperature-entropy (T-S) diagram**.This educational task encourages understanding of refrigeration cycles and the application of thermodynamic principles in engineering design.

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A refrigeration system is to be designed to maintain the temperature in the range of -15°C to -5°C, while the outside temperature varies from 15°C to 25°C. The total thermal load on the storage unit is given as 20 kW. Obtain an initial design for the vapor compression refrigeration system shown below. For safe operation and other factors, such as additional energy transfer, design the system using a safety factor of 1.3 such that Q = 26 kW. The compressor efficiency could range from 60 to 80 percent. This is to be completed individually. It would be highly unlikely for multiple students to select all the same design parameters in part (a). Expansion valve or capillary tube Он Condenser Evaporator www Te Compressor Work As part of the design, you should: a) Specify and justify the constraints (isentropic efficiency, condenser, and evaporator temperature) you chose. b) Show the cycle in relation to the two-phase region on a temperature-entropy (T-S) diagram.

A refrigeration system is to be designed to maintain the temperature in the range of -15°C to -5°C, while the outside temperature varies from 15°C to 25°C. The total thermal load on the storage unit is given as 20 kW. Obtain an initial design for the vapor compression refrigeration system shown below. For safe operation and other factors, such as additional energy transfer, design the system using a safety factor of 1.3 such that Q = 26 kW. The compressor efficiency could range from 60 to 80 percent. This is to be completed individually. It would be highly unlikely for multiple students to select all the same design parameters in part (a). Expansion valve or capillary tube Он Condenser Evaporator www Te Compressor Work As part of the design, you should: a) Specify and justify the constraints (isentropic efficiency, condenser, and evaporator temperature) you chose. b) Show the cycle in relation to the two-phase region on a temperature-entropy (T-S) diagram.

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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# Refrigeration System Design

A refrigeration system is to be designed to maintain the temperature in the range of -15°C to -5°C, while the outside temperature varies from 15°C to 25°C. The total thermal load on the storage unit is given as 20 kW. Obtain an initial design for the vapor compression refrigeration system shown below. For safe operation and other factors, such as additional energy transfer, design the system using a safety factor of 1.3 such that Q_L = 26 kW. The compressor efficiency could range from 60 to 80 percent.

**This is to be completed individually. It would be highly unlikely for multiple students to select all the same design parameters in part (a).**

## Diagram Explanation

The diagram illustrates a basic vapor compression refrigeration cycle, consisting of four main components:

1. **Evaporator**: Absorbs heat (Q_L) from the refrigerated space.
2. **Condenser**: Releases heat (Q_H) to the surroundings.
3. **Expansion Valve or Capillary Tube**: Reduces the refrigerant pressure and temperature.
4. **Compressor**: Compresses the refrigerant to a high-pressure, high-temperature state while doing work.

## Design Tasks

As part of the design, you should:

a) **Specify and justify the constraints** (isentropic efficiency, condenser, and evaporator temperature) you chose.

b) **Show the cycle in relation to the two-phase region on a temperature-entropy (T-S) diagram**.

This educational task encourages understanding of refrigeration cycles and the application of thermodynamic principles in engineering design.

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MODULE: THERMODYNAMIC QUESTION 5 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 −10.09°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 0.4 MPa. Part of the refrigerant evaporates during this flashing process, and this vapour 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. Assuming the refrigerant leaves the evaporator as a saturated vapour determine the COP of this refrigerator. NOTE: Your answer should be in 2 decimal places.