lecture 10 - engines

lecture 10 - engines - Announcements1/28/11 Prayer...

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Announcements 1/28/11 Prayer HW 8:  one with invalid CID Lab 2 due tomorrow Exam 1 starts in a week and a half
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Special Processes: Review Constant volume (isovolumetric) Constant pressure (isobaric) Constant temperature (isothermal) No heat added (adiabatic) General process? α. ∆ E int  = ? b. W on gas  = ? c. Q added  = ? A B P V
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Last Special Case: Cyclical Processes E int  = ? net W by gas  or W on gas ?   |W| = ? Q added  = ? P V State 1
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Engines: Energy Transformation Q in  = work by gas + Q out Notation: Q h , Q c , T h , T c , |W| Q h  = |W| + Q c engine heat in (higher T) work exhaust out (lower T)
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(a) - piston at room temp and atmospheric pressure P V a Heat Engine Example
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(a-b) - gas heated to keep volume constant as cart rolls onto piston P V a b Heat Engine Example
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(b-c) - gas heated to increase volume and lift the cart P V a b c Heat Engine Example
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(c-d) - gas cooled to keep volume constant at cart rolls off piston P V a b c d Heat Engine Example
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(d-a) - gas cooled to reduce volume back to initial level P V a b c d Heat Engine Example
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How good is your engine? Definition
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This document was uploaded on 02/29/2012.

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lecture 10 - engines - Announcements1/28/11 Prayer...

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