Conservation & Acct Princ
Conservation & Acct Princ ES 201
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This 2 page Class Notes was uploaded by Napoleon Turcotte II on Monday October 19, 2015. The Class Notes belongs to ES 201 at Rose-Hulman Institute of Technology taught by Staff in Fall. Since its upload, it has received 13 views. For similar materials see /class/225126/es-201-rose-hulman-institute-of-technology in Engineering & Applied Science at Rose-Hulman Institute of Technology.
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Date Created: 10/19/15
ES 201 Conservation amp Accountin Principles Fall 20002001 OBJECTIVES Entropy Accounting amp The Second Law of Thermodynamics De ne illustrate and explain the following terms and concepts Second Law of Thermodynamics Reversible processes internally reversible vs internally irreversible units kJK Btu R speci c entropy 3 units kJKkg Btu Rlbm Application of Accounting Principle for Entropy rate of accumulation of entropy within the s stem amount of entropy within the system SW IV S p dV transport rate of entropy across system boundaries transport rate of entropy by heat transfer transport rate of entropy by mass ow in out productionconsumption of entropy EMPIRICAL EVIDENCE Entropy can only be produced and in the limit of an internally reversible process entro is conserved gt 0 Internally irreversible rate of entropy production S g 0 Internally reversible Accounting Equation for Entropy dS rate form 5 Z QJ Z misi Z mesa ng dt T in out N Apply the accounting equation for entropy in conjunction with the conservation of energy equation to calculate the entropy generation or the entropy generation rate for a system when all required entropy values are known or suitable property models are speci ed e g ideal gas or incompressible substance LN Given sufficient information determine the speci c entropy change As for a substance when one of the following substance models apply 0 Ideal gas with constant speci c heats o Incompressible substance with constant speci c heats ObjiEntropydoc vl Page 1 ES 201 Conservation amp Accountin Principles Fall 20002001 4 Apply the accounting equation for entropy in conjunction with the conservation of energy equation to calculate the entropy generation rate or entropy generation for steadystate device or cycle 5 Apply the accounting equation for entropy in conjunction with the conservation of energy equation to determine best possible performance ie theoretical maximum thermal efficiency or coef cient of performance for a cycle ObjiEntropydoc vl Page 2
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