Transmission of heat can take place in three ways i.e., conduction, conviction and radiation, in which radiation takes important role because medium will not be required for transmission of heat.
But for conduction and conviction, there should be material medium for passing heat.
According to law of conservation of energy, there is no dissipation of energy but it can transform to one place to another place. Another important point here to remember is that heat must be transformed from higher level of energy to lower level of energy. Like that, heat is transformed to hot body to cold body.
As energy is vector, this has direction and quantity, like that heat energy has the direction of transmission from hot body to cold body, this is told by second law of thermodynamics and it also tells the possibility of transmission of heat from cold body to heat body with aid of external agency.
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