The heat energy of a system is considered to have the following two parts:
1.Available heat energy
2.Unavailable heat energy
The available heat energy is that part of the heat energy which can be converted into mechanical work by ideal process which reduce the system in a state of equilibrium.
The unavailable heat energy is that part of heat energy which can not be converted into mechanical work even by ideal process which reduce the system in a state of equilibrium.The common ideas used for unavailable heat energy, according to second Law of Thermodynamics, is the heat rejected by the system to the surrounding.
From above, we have total energy or heat energy or heat supplied to the system,
&Q = Available heat energy + Unavailable heat energy
= A.H.E + U.H.E = Workdone + heat rejected
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