Thermal efficiency Totally Explained

Everything about Thermodynamic Efficiency totally explained

In thermodynamics, the thermal efficiency (

eta_ = 1,

This is because when heating, the work used to run the device is converted to heat and adds to the desired effect, whereas if the desired effect is cooling the heat resulting from the input work is just an unwanted byproduct.

Energy efficiency

The 'thermal efficiency' is sometimes called the energy efficiency. In the United States, in everyday usage the SEER is the more common measure of energy efficiency for cooling devices, as well as for heat pumps when in their heating mode. For energy-conversion heating devices their peak steady-state thermal efficiency is often stated, for example, 'this furnace is 90% efficient', but a more detailed measure of seasonal energy effectiveness is the Annual Fuel Utilization Efficiency (AFUE).

Example of energy efficiency

Application	Energy efficiency
Combustion engine	20-30%
Electric motors	30-60% (small ones < 10W); 50-90 (middle ones between 10-200W); 70-99.99% above 200W
Household refrigerators	low end systems ~ 20%; high end systems ~ 40-50%
Incandescent bulbs	5-10%
Electric shower	90-95% (but here its kind of waste, you're using noble electric energy to produce heat, best would be to use a heat pump, then you'd consume far less electric energy)

Further Information

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