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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. A commercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at -30°C by rejecting its waste heat to cooling water that enters the condenser at 18°C at a rate of 0.28 kg/s and leaves at 26°C. The refrigerant enters the condenser at 1.2 MPa and 65°C and leaves at 42°C. The inlet state of the compressor is 60 kPa and -34°C and the compressor is estimated to gain a net heat of 420 W from the surroundings. The heat exchanger loses no heat to the environment. ajo 26°C ↑ 42°C Condenser (3) Expansion valve Water 18°C (2) 1.2 MPa 65°C ↑ D Oin in

NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. A commercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at -30°C by rejecting its waste heat to cooling water that enters the condenser at 18°C at a rate of 0.28 kg/s and leaves at 26°C. The refrigerant enters the condenser at 1.2 MPa and 65°C and leaves at 42°C. The inlet state of the compressor is 60 kPa and -34°C and the compressor is estimated to gain a net heat of 420 W from the surroundings. The heat exchanger loses no heat to the environment. ajo 26°C ↑ 42°C Condenser (3) Expansion valve Water 18°C (2) 1.2 MPa 65°C ↑ D Oin in

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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### Transcription and Diagram Explanation **Text:** NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. A commercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at –30°C by rejecting its waste heat to cooling water that enters the condenser at 18°C at a rate of 0.28 kg/s and leaves at 26°C. The refrigerant enters the condenser at 1.2 MPa and 65°C and leaves at 42°C. The inlet state of the compressor is 60 kPa and –34°C and the compressor is estimated to gain a net heat of 420 W from the surroundings. The heat exchanger loses no heat to the environment. Determine the refrigeration load. (Take the required values from saturated refrigerant-134a tables and steam tables.) (You must provide an answer before moving on to the next part.) The refrigeration load is _______ kW. **Diagram Explanation:** The diagram illustrates the refrigeration cycle using refrigerant-134a within a commercial refrigerator system. The primary components in this cycle are labeled and described as follows: 1. **Evaporator (4):** Located at the bottom, it absorbs heat from the space to be refrigerated. The refrigerant enters the evaporator at –34°C and exits towards the compressor. This stage is marked with `Q̇L` indicating the heat absorption process. 2. **Compressor (1):** Positioned to the right, the compressor receives refrigerant at 60 kPa and –34°C, compresses it, raising its temperature and pressure before it moves to the condenser. It is indicated with arrows showing work done on the refrigerant (`Ẇin`) and heat gain from the surroundings (`Q̇in`). 3. **Condenser (2):** Located at the top, the refrigerant enters at 1.2 MPa and 65°C and exits at 42°C. The condenser rejects the absorbed heat to the cooling water circulating through it, entering at 18°C and leaving at 26°C. 4. **Expansion Valve (3):** Situated to the left, it expands the refrigerant, causing a drop in temperature and pressure before entering the evaporator again to complete the cycle. The diagram captures the temperature and pressure changes of the refrigerant through various stages, reinforcing the thermodynamic cycle in a
Transcribed Image Text:### Transcription and Diagram Explanation **Text:** NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. A commercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at –30°C by rejecting its waste heat to cooling water that enters the condenser at 18°C at a rate of 0.28 kg/s and leaves at 26°C. The refrigerant enters the condenser at 1.2 MPa and 65°C and leaves at 42°C. The inlet state of the compressor is 60 kPa and –34°C and the compressor is estimated to gain a net heat of 420 W from the surroundings. The heat exchanger loses no heat to the environment. Determine the refrigeration load. (Take the required values from saturated refrigerant-134a tables and steam tables.) (You must provide an answer before moving on to the next part.) The refrigeration load is _______ kW. **Diagram Explanation:** The diagram illustrates the refrigeration cycle using refrigerant-134a within a commercial refrigerator system. The primary components in this cycle are labeled and described as follows: 1. **Evaporator (4):** Located at the bottom, it absorbs heat from the space to be refrigerated. The refrigerant enters the evaporator at –34°C and exits towards the compressor. This stage is marked with `Q̇L` indicating the heat absorption process. 2. **Compressor (1):** Positioned to the right, the compressor receives refrigerant at 60 kPa and –34°C, compresses it, raising its temperature and pressure before it moves to the condenser. It is indicated with arrows showing work done on the refrigerant (`Ẇin`) and heat gain from the surroundings (`Q̇in`). 3. **Condenser (2):** Located at the top, the refrigerant enters at 1.2 MPa and 65°C and exits at 42°C. The condenser rejects the absorbed heat to the cooling water circulating through it, entering at 18°C and leaving at 26°C. 4. **Expansion Valve (3):** Situated to the left, it expands the refrigerant, causing a drop in temperature and pressure before entering the evaporator again to complete the cycle. The diagram captures the temperature and pressure changes of the refrigerant through various stages, reinforcing the thermodynamic cycle in a
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