About

The website is devoted to all things ENERGY.

Inspiration and ideas are taken from the 3rd year Engineering Thermodynamics class at Deakin University.

Thankyou to all the students who have contributed.

Objectives of this Website-

•To explore basic engineering thermodynamic principles of energy conservation, energy conversion and energy quality
•To help in the understanding of global energy issues and the need for sensible, sustainable solutions.
Thermodynamics
can be defined as the science of energy.
What is ENERGY?.
  • Energy can be viewed as the ability to cause changes.
  • The name thermodynamics stems from the Greek words therme (heat) and dynamis (power), which is descriptive of the early efforts to convert heat into power.
  • Today the same name is broadly interpreted to include all aspects of energy and energy transformations, including power production, refrigeration, and relationships among the properties of matter.
  • Thermodynamics has developed into different branches: engineering thermodynamics, chemical thermodynamics, statistical thermodynamics etc.
  • Engineering thermodynamics – deals with the engineering issues/technology in energy conversion.

Microscopic forms of energy: Energy related to the molecular structure of a system and the degree of the molecular activity.

  • Internal energy, U:  The sum of all the microscopic forms of energy.
  • Sensible energy: The portion of the internal energy of a system associated with the kinetic energies of the molecules.
  • Latent energy: The internal energy associated with the phase of a system.
  • Chemical energy: The internal energy associated with the atomic bonds in a molecule.
  • Nuclear energy: The tremendous amount of energy associated with the strong bonds within the nucleus of the atom itself.

Macroscopic forms of energy:  Energy a system possesses as a whole with respect to some outside reference frame, such as kinetic and potential energies.

  • Kinetic energy, KE: The energy that a system possesses as a result of its motion relative to some reference frame.
  • Potential energy, PE: The energy that a system possesses as a result of its elevation in a gravitational field.

Heat

  • Heat is defined as the form of energy that is transferred across the boundary of a system at a given temperature to another system (or the surroundings) at a lower temperature by virtue of the temperature difference between the two systems.
  • Heat is not contained by a body
  • Heat can be identified only as it crosses the boundary.
  • Thus, heat is a transient phenomenon.
  • Since heat transfer is energy in transition across the system boundary due to a temperature difference, there are three modes of heat transfer at the boundary that depend on the temperature difference between the boundary surface and the surroundings. These are:•
    conduction,•
    convection,•
    radiation.

What is Temperature?

  • A measure proportional to the average translational kinetic energy associated with the disordered microscopic motion of atoms and molecules.
  • The flow of heat is from a high temperature region toward a lower temperature region.
  • Temperature is the degree of ‘hotness’ of a body: more precisely it is the potential for heat transfer.
  • Temperature is a measure of the tendency of an object to spontaneously give up energy to its surroundings. When two objects are in thermal contact, the one that tends to spontaneously lose energy is at the higher temperature.
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