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Q.1. A refrigeration process with interstage cooling uses refrigerant HFC-134a, and the outlet of the condenser is to be saturated liquid at 40°C. Refer to the following figure for stream numbers in your solution. The pressure of the flash chamber and the intermediate pressure between compressors is to be 290 kPa. The evaporator is to operate at -20°C and the outlet is to be saturated vapor. The flowrate of stream 1 is 23 kg/h. The flash chamber may be considered adiabatic. The compressors may be considered to be 80% efficient. a) What is the power input required to the first compressor? b) What are the flowrates of streams 6 and 7? c) What is the enthalpy of stream 4? Hot Side 6. Condenser 2nd Stage Compressor Throttle Valve 7 Flash Vapor Phase Only. Chamber 1st Stage Compressor Throttle Valve Evaporator Cold Side

Q.1. A refrigeration process with interstage cooling uses refrigerant HFC-134a, and the outlet of the condenser is to be saturated liquid at 40°C. Refer to the following figure for stream numbers in your solution. The pressure of the flash chamber and the intermediate pressure between compressors is to be 290 kPa. The evaporator is to operate at -20°C and the outlet is to be saturated vapor. The flowrate of stream 1 is 23 kg/h. The flash chamber may be considered adiabatic. The compressors may be considered to be 80% efficient. a) What is the power input required to the first compressor? b) What are the flowrates of streams 6 and 7? c) What is the enthalpy of stream 4? Hot Side 6. Condenser 2nd Stage Compressor Throttle Valve 7 Flash Vapor Phase Only. Chamber 1st Stage Compressor Throttle Valve Evaporator Cold Side

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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**Q1.** A refrigeration process with interstage cooling uses refrigerant HFC-134a, and the outlet of the condenser is to be saturated liquid at 40°C. Refer to the following figure for stream numbers in your solution. The pressure of the flash chamber and the intermediate pressure between compressors is to be 290 kPa. The evaporator is to operate at -20°C and the outlet is to be saturated vapor. The flowrate of stream 1 is 23 kg/h. The flash chamber may be considered adiabatic. The compressors may be considered to be 80% efficient. a) What is the power input required to the first compressor? b) What are the flowrates of streams 6 and 7? c) What is the enthalpy of stream 4? **Diagram Explanation:** - **Condenser:** Transfers heat from the refrigerant to the hot side. The input stream is from the 2nd stage compressor (stream 5), resulting in output that is a saturated liquid at 40°C (stream 6). - **Throttle Valves:** Regulate pressure and temperature in the system. Located after the condenser (between streams 6 and 7) and after the evaporator (stream 8). - **Flash Chamber:** Separates liquid and vapor phases. Receives stream 7 from the first throttle valve; outputs vapor-phase stream 3 to the first stage compressor and liquid-phase stream 8. - **1st Stage Compressor:** Pressurizes the vapor from the flash chamber (stream 3), outputting stream 4. - **2nd Stage Compressor:** Further compresses stream 4 to stream 5 before entering the condenser. - **Evaporator:** Heat is absorbed from the cold side, cooling the refrigerant, which exits as saturated vapor at -20°C (stream 1).
Transcribed Image Text:**Q1.** A refrigeration process with interstage cooling uses refrigerant HFC-134a, and the outlet of the condenser is to be saturated liquid at 40°C. Refer to the following figure for stream numbers in your solution. The pressure of the flash chamber and the intermediate pressure between compressors is to be 290 kPa. The evaporator is to operate at -20°C and the outlet is to be saturated vapor. The flowrate of stream 1 is 23 kg/h. The flash chamber may be considered adiabatic. The compressors may be considered to be 80% efficient. a) What is the power input required to the first compressor? b) What are the flowrates of streams 6 and 7? c) What is the enthalpy of stream 4? **Diagram Explanation:** - **Condenser:** Transfers heat from the refrigerant to the hot side. The input stream is from the 2nd stage compressor (stream 5), resulting in output that is a saturated liquid at 40°C (stream 6). - **Throttle Valves:** Regulate pressure and temperature in the system. Located after the condenser (between streams 6 and 7) and after the evaporator (stream 8). - **Flash Chamber:** Separates liquid and vapor phases. Receives stream 7 from the first throttle valve; outputs vapor-phase stream 3 to the first stage compressor and liquid-phase stream 8. - **1st Stage Compressor:** Pressurizes the vapor from the flash chamber (stream 3), outputting stream 4. - **2nd Stage Compressor:** Further compresses stream 4 to stream 5 before entering the condenser. - **Evaporator:** Heat is absorbed from the cold side, cooling the refrigerant, which exits as saturated vapor at -20°C (stream 1).
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