Such machines do not exist no mater how much we wish they did. In fact they would violate one or more of these 3 basic laws of physics.
- In any isolated system, one cannot create new energy (first law of thermodynamics)
- The output power of heat engines is always smaller than the input heating power. The rest of the energy is removed as heat at ambient temperature. The efficiency (this is the produced power divided by the input heating power) has a maximum, given by the Carnot efficiency. It is always lower than one.
- The efficiency of real heat engines is even lower than the Carnot efficiency due to irreversible processes.