Basic Concepts in Engineering Thermodynamics

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Basic Concepts in Engineering Thermodynamics

• P M V Subbarao
• Professor
• Mechanical Engineering Department
• I I T Delhi

Construction of Simple Premises for Valuable
Engineering Science..
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Definition of Thermodynamics

• Thermodynamics is defined as the science of
  energy.
• The name Thermodynamics stems from the Greek
  words therme (Heat) and dynamics (Power).
• Clearly depicting the early efforts to convert
  heat into power.

Steam power already had many uses - draining
water from mines, excavating ports and rivers,
forging iron, grinding grain, and spinning and
weaving cloth - but it was inefficient.
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The Carnots Queries
A Man Who Proved that Proper Blend of Science,
Mathematics and Ingenuity is Good Engineering.
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Definition of Engineering Thermodynamics

• Engineering Thermodynamics is the subject that
  deals with the study of the science of
  thermodynamics and the usefulness of this science
  in the design of each every process, device or
  system involving the effective utilization of
  energy and matter for the benefit of mankind.
• The Trio of Thermodynamics Heat, Work Energy.
• Matter playing the role of a House.

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Albert Einsteins Opinion on Best Theory

• A Theory is more impressive or useful
• the greater the simplicity of its premises is,
• the more different kinds of things it relates,
• and the more extended is its area of
  applicability.
• Therefore, the deep impression which Classical
  Thermodynamics made upon me.
• It is only physical theory of universal content
  concerning which I am convinced that ,
• within the framework of the applicability of its
  basic concepts, it will never be overthrown.

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Inspiring Words Albert Einstein

• When asked what he wished to become, as a young
  man, Nobel Laureate Albert Einstein said,
• "I want to become a useful person, not a
  successful person."
• Asked what he meant by it, the eminent physicist
  replied,
• "A successful person is one who takes from
  society more than what he gives it.
• A useful person is one who gives the society more
  than what he takes from it."

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Thermodynamics beyond Engineering

• Human Thermodynamics (HT) is the study of heat
  and work transformations involved in the
  processes of human existence.
• Psychodynamics Originated the application of
  the First Law of Thermodynamics to the realm of
  conserved conscious and unconscious and mental
  processes.
• Chemical Thermodynamics. Invented by Gibbs.
• You are a big chemical reaction. Everything you
  say, all that you do, all that you see, decide or
  remember, think or feel is nothing but the
  manifestation of the chemical reaction that is
  you. Jim Eadon

http//www.humanthermodynamics.com
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Thermodynamic Vision of Science Engineering
Accept Theory
Test Theory
Particular Relations
INDUCTION
DEDUCTION
Propose Theory
Engineering Relations
Secondary concepts
Industrial Processes
Primitive concepts
Impact on Society
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Application of Thermodynamics
Available Resources (Energy, matter etc.,)
Thermodynamics Laws and information
Engineering of Thermal processes, devices and
systems.
Other Engineering Sciences
NO
Is Design meeting Humans NEED?
Social Sciences and Humanities
YES (task completed)
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List of Aims Which Demand Thermodynamic Study

• Achieving of better fuel economy for any power
  system.
• Achieving better control of environment with
  minimum power consumption.
• Analysis of diseases occurring in biological
  systems.
• Creation, Identification and Qualification of of
  New Resources of Energy.
• Analysis of behaviour of extreme human activities.

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Future Expectations from Light Commercial Vehicles
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The first step Identification of Target
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Parameters of High Concern
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The Precise Target
Exhaust gas energy loss
Transmission System

• ENGINE

Brake Power
Mileage
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One Historical Event for Better focus on the
Target

• In 1893, the Benz Velo became the world's first
  inexpensive, mass-produced car.
• 12000 unites were produced.
• 0.7 hp and 958cc!!!

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More Close Look at the Target
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Another Historical Event for Better focus on the
Target

• The Mercedes 35 HP (German Mercedes 35 PS) was a
  radical early car model designed in 1901.
• Engine volume 5,918CC.
• The racecar was of a disappointing performance by
  multiple technical complications and enduring
  just for few laps.

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Different Look at the Target