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7.25 As shown in Fig. P7.25, a 1-lb metal sphere initially at 2000°R is removed from an oven and quenched by immersing it in a closed tank containing 25 lb of water initially at 500°R. Each substance can be modeled as incompressible. An appropriate constant specific heat for the water is c 1.0 Btu/lb °R, and an appropriate value for the metal is cm = 0.1 Btu/lb oR. Heat transfer from the tank contents can be neglected. Determine the exergy destruction, in Btu. Let To = 77°F. System boundary Metal sphere: Tmi=2000°R m=0.1 Btu/lb R mm= 1 lb Water: Twj=500°R =1.0 Btu/lb R m 25 lb FIGURE P7.25

7.25 As shown in Fig. P7.25, a 1-lb metal sphere initially at 2000°R is removed from an oven and quenched by immersing it in a closed tank containing 25 lb of water initially at 500°R. Each substance can be modeled as incompressible. An appropriate constant specific heat for the water is c 1.0 Btu/lb °R, and an appropriate value for the metal is cm = 0.1 Btu/lb oR. Heat transfer from the tank contents can be neglected. Determine the exergy destruction, in Btu. Let To = 77°F. System boundary Metal sphere: Tmi=2000°R m=0.1 Btu/lb R mm= 1 lb Water: Twj=500°R =1.0 Btu/lb R m 25 lb FIGURE P7.25

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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7.25 As shown in Fig. P7.25, a 1-lb metal sphere initially at 2000°R is removed from an oven and quenched by immersing it in a closed tank containing 25 lb of water initially at 500°R. Each substance can be modeled as incompressible. An appropriate constant specific heat for the water is c 1.0 Btu/lb °R, and an appropriate value for the metal is cm = 0.1 Btu/lb oR. Heat transfer from the tank contents can be neglected. Determine the exergy destruction, in Btu. Let To = 77°F. System boundary Metal sphere: Tmi=2000°R m=0.1 Btu/lb R mm= 1 lb Water: Twj=500°R =1.0 Btu/lb R m 25 lb FIGURE P7.25
Transcribed Image Text:7.25 As shown in Fig. P7.25, a 1-lb metal sphere initially at 2000°R is removed from an oven and quenched by immersing it in a closed tank containing 25 lb of water initially at 500°R. Each substance can be modeled as incompressible. An appropriate constant specific heat for the water is c 1.0 Btu/lb °R, and an appropriate value for the metal is cm = 0.1 Btu/lb oR. Heat transfer from the tank contents can be neglected. Determine the exergy destruction, in Btu. Let To = 77°F. System boundary Metal sphere: Tmi=2000°R m=0.1 Btu/lb R mm= 1 lb Water: Twj=500°R =1.0 Btu/lb R m 25 lb FIGURE P7.25
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