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A piston-cylinder device as shown in Figure 1-7, initially contains 0.75 kg of refrigerant- 134a at 120 kPa and 20°C. Heat is now transferred to the refrigerant from a source at 150°C, and the piston, which is resting on a set of stops, starts moving when the pressure inside reaches 140 kPa. Heat transfer continues until the temperature reaches 90°C. Assuming the surroundings to be at 25°C and 100 kPa, determine: (a) the work done, (b) the heat transfer, (c) the exergy destroyed, (d) the second law efficiency of this process. Environment 100 kPa 25°C R-134a R-134a 0.75 kg 120 kPa 0.75 kg Heat 140 kPa 20°C 90°C Initial State Heat Source Final State 150°C Figure 1-7 A piston-cylinder device

A piston-cylinder device as shown in Figure 1-7, initially contains 0.75 kg of refrigerant- 134a at 120 kPa and 20°C. Heat is now transferred to the refrigerant from a source at 150°C, and the piston, which is resting on a set of stops, starts moving when the pressure inside reaches 140 kPa. Heat transfer continues until the temperature reaches 90°C. Assuming the surroundings to be at 25°C and 100 kPa, determine: (a) the work done, (b) the heat transfer, (c) the exergy destroyed, (d) the second law efficiency of this process. Environment 100 kPa 25°C R-134a R-134a 0.75 kg 120 kPa 0.75 kg Heat 140 kPa 20°C 90°C Initial State Heat Source Final State 150°C Figure 1-7 A piston-cylinder device

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
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A piston-cylinder device as shown in Figure 1-7, initially contains 0.75 kg of refrigerant- 134a at 120 kPa and 20°C. Heat is now transferred to the refrigerant from a source at 150°C, and the piston, which is resting on a set of stops, starts moving when the pressure inside reaches 140 kPa. Heat transfer continues until the temperature reaches 90°C. Assuming the surroundings to be at 25°C and 100 kPa, determine: (a) the work done, (b) the heat transfer, (c) the exergy destroyed, (d) the second law efficiency of this process. Environment 100 kPa 25°C R-134a R-134a 0.75 kg 0.75 kg Нeat 120 kPa 140 kPa 20°C 90°C Initial State Heat Source Final State 150°C Figure 1-7 A piston-cylinder device
Transcribed Image Text:A piston-cylinder device as shown in Figure 1-7, initially contains 0.75 kg of refrigerant- 134a at 120 kPa and 20°C. Heat is now transferred to the refrigerant from a source at 150°C, and the piston, which is resting on a set of stops, starts moving when the pressure inside reaches 140 kPa. Heat transfer continues until the temperature reaches 90°C. Assuming the surroundings to be at 25°C and 100 kPa, determine: (a) the work done, (b) the heat transfer, (c) the exergy destroyed, (d) the second law efficiency of this process. Environment 100 kPa 25°C R-134a R-134a 0.75 kg 0.75 kg Нeat 120 kPa 140 kPa 20°C 90°C Initial State Heat Source Final State 150°C Figure 1-7 A piston-cylinder device
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