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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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Presentation Transcript
history
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

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

Chemical Engineering Thermodynamics-I

example
Example

Chemical Engineering Thermodynamics-I

so thermodynamics is
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

why study thermodynamics
Why study thermodynamics?
  • Design of equipment such as
    • steam turbines
    • refrigerators and heat pumps
    • compressors
    • boilers
    • condensers
    • cooling towers and heat exchangers

Chemical Engineering Thermodynamics-I

methods of studying
Methods of Studying
  • Two methods of studying thermodynamics
    • Classical thermodynamics
    • Statistical thermodynamics

Chemical Engineering Thermodynamics-I

classical thermodynamics
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

Chemical Engineering Thermodynamics-I

statistical thermodynamics
Statistical Thermodynamics
  • Based on average behavior of large groups of individual particles
  • The microscopic approach is more elaborate and is rather involved

Chemical Engineering Thermodynamics-I

scope of thermodynamics
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

Chemical Engineering Thermodynamics-I

scope of thermodynamics11
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

Chemical Engineering Thermodynamics-I

scope of thermodynamics12
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

Chemical Engineering Thermodynamics-I

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

Chemical Engineering Thermodynamics-I

concluding remark14
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

Chemical Engineering Thermodynamics-I

text book
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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