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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
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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## 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 the isentropic efficiency is 86 percent for both compressors. (Take the required values from saturated refrigerant-134a tables.) ### Diagram Explanation The diagram illustrates a two-stage cascade refrigeration cycle involving: 1. **Evaporator (Component 1 to 8):** - Absorbs heat \( \dot{Q}_L \) from the refrigerated space, causing the refrigerant to evaporate. 2. **Low-pressure Compressor (Component 2 to 9):** - Compresses the vapor from the evaporator. 3. **Flash Chamber (Component 3):** - Receives the refrigerant from an expansion valve and separates vapor from the liquid. 4. **High-pressure Compressor (Component 4 to 5):** - Compresses mixed vapor from the flash chamber and low-pressure compressor to the condenser pressure. 5. **Condenser (Component 5 to 4):** - Rejects heat \( \dot{Q}_H \) to the surroundings, causing the refrigerant to condense. 6. **Expansion Valves (Component 6 and 7):** - Reduce the pressure of the refrigerant at different stages. ### Problem Statement Determine the rate of refrigeration supplied by the system. The rate of refrigeration supplied by the system is _____ kW.
Transcribed Image Text:## 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 the isentropic efficiency is 86 percent for both compressors. (Take the required values from saturated refrigerant-134a tables.) ### Diagram Explanation The diagram illustrates a two-stage cascade refrigeration cycle involving: 1. **Evaporator (Component 1 to 8):** - Absorbs heat \( \dot{Q}_L \) from the refrigerated space, causing the refrigerant to evaporate. 2. **Low-pressure Compressor (Component 2 to 9):** - Compresses the vapor from the evaporator. 3. **Flash Chamber (Component 3):** - Receives the refrigerant from an expansion valve and separates vapor from the liquid. 4. **High-pressure Compressor (Component 4 to 5):** - Compresses mixed vapor from the flash chamber and low-pressure compressor to the condenser pressure. 5. **Condenser (Component 5 to 4):** - Rejects heat \( \dot{Q}_H \) to the surroundings, causing the refrigerant to condense. 6. **Expansion Valves (Component 6 and 7):** - Reduce the pressure of the refrigerant at different stages. ### Problem Statement Determine the rate of refrigeration supplied by the system. The rate of refrigeration supplied by the system is _____ kW.
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