Comparison between Exergy and Energy

Comparison between Exergy(Availability) and Energy can be made in the following ways.
Exergy (Availability)
1 Exergy(Availability) doesn’t follow the law of conservation of energy. Energy follows the law of conservation of energy.
2 It is a function of states of the matter under consideration and the ‘environment’. It is a function of the state of matter under consideration.
3 It is estimated with respect to the state of reference imposed by the environment. It may be calculated based upon the assumed state of reference.
4 Exergy always depends upon pressure. In case of ideal gas, energy does not depend upon pressure.
5 Exergy increases with a temperature drop at low temperatures. For constant pressure processes, exergy attains minimum value at the temperature of the environment. Energy increases with rising of temperature.
6 Exergy has positive value for ideal vacuum. Energy is zero for an ideal vacuum.
Spread the Knowledge

'ME Mechanical' is an online portal for mechanical engineers and engineering students. Published hundreds of articles on various engineering topics. Visit our about section to know more.

Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.