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EGN_3358_Notes_Ch2_Thermod_Basic concept-2

EGN_3358_Notes_Ch2_Thermod_Basic concept-2 - EGN 3358...

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EGN-3358 – Thermo-Fluids-Heat Transfer EGN 3358 Thermo-Fluids-Heat Transfer Lecture 3: Energy Transferred by Heat, Work and Mass “Chapter 2 - Part 2”
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EGN-3358 – Thermo-Fluids-Heat Transfer Closed System and Open System
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EGN-3358 – Thermo-Fluids-Heat Transfer Conservation of Energy Principle for Closed Systems
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EGN-3358 – Thermo-Fluids-Heat Transfer Conduct some processes State 1 p 1 T V E 1 1 1 State 2 p 2 T V E 2 2 2 Consider a Closed System
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EGN-3358 – Thermo-Fluids-Heat Transfer Perform an energy balance on the system between state 1 and state 2.
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EGN-3358 – Thermo-Fluids-Heat Transfer Perform an energy balance on the system between state 1 and state 2. 2 1 E by W out Q on W in Q E = - - + +
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EGN-3358 – Thermo-Fluids-Heat Transfer Perform an energy balance on the system between state 1 and state 2. E - represents the stored energy of the system 2 1 E by W out Q on W in Q E = - - + +
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EGN-3358 – Thermo-Fluids-Heat Transfer Perform an energy balance on the system between state 1 and state 2. E - represents the stored energy of the system Q & W - represent transient energies which cross the boundaries of the system as heat and work respectively. 2 1 E by W out Q on W in Q E = - - + +
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EGN-3358 – Thermo-Fluids-Heat Transfer Rearrange this equation to put transient energy on one side and stored energy on the other side 2 1 E by W out Q on W in Q E = - - + +
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EGN-3358 – Thermo-Fluids-Heat Transfer Rearrange this equation to put transient energy on one side and stored energy on the other side Q Q W W E E in out on by - + - = - 2 1 Combine Heat terms and Work terms 2 1 E by W out Q on W in Q E = - - + +
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EGN-3358 – Thermo-Fluids-Heat Transfer Rearrange this equation to put transient energy on one side and stored energy on the other side Q Q W W E E in out on by - + - = - 2 1 Combine Heat terms and Work terms Q Q Q W W W net in out net by on = - = - 2 1 E by W out Q on W in Q E = - - + +
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EGN-3358 – Thermo-Fluids-Heat Transfer E Q in W on E Q out W by 1 2 + + = + + Rearrange this equation to put transient energy on one side and stored energy on the other side Q Q W W E E in out on by - + - = - 2 1 Combine Heat terms and Work terms Q Q Q W W W net in out net by on = - = - Q W E net net - = ∆
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EGN-3358 – Thermo-Fluids-Heat Transfer
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