Thermal Science (18AS41)
Vamsi Krishna Chowduru, Asst Prof
, Second law of thermodynamics
• Energy has quality as well as quantity.
• Means to determine the quality as well as the degree of degradation of
energy during the process.
• Determines theoretical limits for the performance of commonly used
engineering systems
• Degree of completion in chemical reactions.
• A natural process that starts in one equilibrium state and end in another
will go in the direction that causes the entropy of the system plus the
environment to increase for an irreversible process and to remain
constant for a reversible process.
Sf = Si (reversible) Sf > Si (irreversible)
Vamsi Krishna Chowduru, Asst Prof
, Second law of thermodynamics
• Energy has quality as well as quantity.
• Means to determine the quality as well as the degree of degradation of
energy during the process.
• Determines theoretical limits for the performance of commonly used
engineering systems
• Degree of completion in chemical reactions.
• A natural process that starts in one equilibrium state and end in another
will go in the direction that causes the entropy of the system plus the
environment to increase for an irreversible process and to remain
constant for a reversible process.
Sf = Si (reversible) Sf > Si (irreversible)
