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Introduction to Chemical Engineering Thermodynamics-I. Ashfaq M Ansery ChE Deptt, BUET. History. The name was coined in 1849 by Lord Kelvin by combining Greek words for heat ( thermos ) and power ( dynamos )

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Introduction to Chemical Engineering Thermodynamics-I

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Introduction to chemical engineering thermodynamics i l.jpg

Introduction to Chemical Engineering Thermodynamics-I

Ashfaq M Ansery

ChE Deptt, BUET


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History

  • The name was coined in 1849 by Lord Kelvin by combining Greek words for heat (thermos) and power (dynamos)

  • The science of thermodynamics was born in the middle of 19th century to describe the operation of steam engine and their limit of operation

Chemical Engineering Thermodynamics-I


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Thermodynamics

  • Thermodynamics is the study of the inter-relation between heat, work and internal energy of a system

Chemical Engineering Thermodynamics-I


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Example

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So…… Thermodynamics is

  • the science of heat and work and related properties

  • the basic science that deals with energy

  • the study of energy movements

Chemical Engineering Thermodynamics-I


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Why study thermodynamics?

  • Design of equipment such as

    • steam turbines

    • refrigerators and heat pumps

    • compressors

    • boilers

    • condensers

    • cooling towers and heat exchangers

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Methods of Studying

  • Two methods of studying thermodynamics

    • Classical thermodynamics

    • Statistical thermodynamics

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Classical thermodynamics

  • Macroscopic viewpoint towards mater

  • It requires no hypothesis about the detail structure of matter on the atomic scale, nor it is necessary to assume that molecules exist

  • Its conclusions are quite general

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Statistical Thermodynamics

  • Based on average behavior of large groups of individual particles

  • The microscopic approach is more elaborate and is rather involved

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Scope of Thermodynamics

  • The basis of thermodynamics is ‘experimental observation’

  • These findings have formalized into certain basic laws

    • Zeroth law

    • First law of thermodynamics

    • Second law of thermodynamics

    • Third law of thermodynamics

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Scope of Thermodynamics

  • The first law of thermodynamics is simply an expression of the conservation energy principle

  • The 2nd law of thermodynamics asserts that energy has quality as well as quantity; and actual process occur in the direction of decreasing quality of energy

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Scope of Thermodynamics

  • Thermodynamics deals with equilibrium positions

  • Thermodynamic considerations do not establish the ratesof physical or chemical processes

  • Thermodynamics, a macroscopic-property formulation, cannot reveal the microscopic (molecular) mechanisms of physical or chemical processes

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Concluding Remark

  • If everything is so simple, why does thermodynamics have the reputation of being hard?

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Concluding Remark

  • It is full of hard words and signs and numbers, not very entertaining or understandable looking ... (quoted in Levenspiel, p. xi)

  • The difficulty comes from making precise descriptions of phenomena and in developing a mathematical framework that allows us to cultivate an understanding of the Laws

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Text Book

  • Introduction to CHEMICAL ENGINEERING THERMODYNAMICS, sixth edition

    by

    J. M. Smith, H.C. Van Ness, M.M. Abbott

Chemical Engineering Thermodynamics-I


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