3. The Thermodynamic of Heat engines A heat engine is any device that can take energy from a warm source and convert a fraction of this heat energy to mechanical energy Heat source hot Q1 Figure 3.2 a thermodynamic diagram of a heat engine operating between a heat source and heat sink Work output at a lower temperature The work HEAT ENGINE Aw= Cnot-Qcold) output must equal the difference between the heat energy extracted from the source and that rejected to the sink- the Principle of Energy Heat sink Conservation old3. The Thermodynamic of Heat Engines A heat engine is any device that can take energy from a warm source and convert a fraction of this heat energy to mechanical energy. Figure 3.2 A thermodynamic diagram of a heat engine operating between a heat source and heat sink at a lower temperature. The work output must equal the difference between the heat energy extracted from the source and that rejected to the sink – the Principle of Energy Conservation