Thermal energy lost in any machine can not be recoverd. Sometimes part of the energy can be recovered, but never all of it. Basically, heat is wasted, or unusable, energy.
Thermal engine is an engine that uses heat as a source of energy. Steam engine, diesel engine, gasoline engine, Stirling engine and drinking bird a common toy that is also a heat engine are the examples or types of engines that uses thermal energy.
heat engine
Engine
mechanical energy
steam engine
The combustion of fuel in the engine generates thermal energy. This thermal energy is converted into kinetic energy by the piston and crankshaft system, which drives the car's wheels and propels the vehicle forward.
steam engine uses thermal energy to convert water into steam and then uses pressure of steam to move the engine .thus thermal energy into pressure and further pressure into mechanical energy.
The amount of work done by a heat engine is not equal to the amount of thermal energy it absorbs. In a heat engine, only a fraction of the thermal energy absorbed is converted into work, with the remaining energy typically being expelled as waste heat. The efficiency of a heat engine is a measure of how effectively it converts thermal energy into work.
A motor that converts thermal energy to mechanical energy is called a heat engine. Heat engines operate by using a temperature difference to generate work, such as a steam engine or an internal combustion engine. The thermal energy is converted into mechanical energy through the expansion of a working fluid.
thermal energy
A combustion engine transfers thermal energy to move one or more pistons that provide power. An example of a combustion engine is an engine in a car.
An internal combustion engine converts chemical energy into Thermal Energy, and converts thermal energy into mechanical energy via the pistons, connecting rods, and crankshaft .