Wi = input to the operation - can work, power, input products ...
Efficiency can be expressed as a percentage or as a per-unit decimal fraction of 1.
The input power to an electric motor is 2000 W. The output power to the shaft is 1800 W. The efficiency of the motor can be calculated as
μ = (1800 W) / (2000 W)
The teoretical energy potential for a wind mill is 300 kWh at given conditions. The power produced is 70 kWh. The efficiency of the wind mill can be calculated as
μ = (70 kWh) / (300 kWh)
The SI-system, unit converters, physical constants, drawing scales and more.
The ratio between heat removed and power (watt) used - EER and SEER.
Combustion gross and net calorific value.
The efficiency of the Carnot cycle.
Optimizing boilers efficiency is important to minimize fuel consumption and unwanted excess to the environment.
Performance and efficiency terminology related to heat pumps and air condition systems.
Maximum cooling tower efficiency is limited by the cooling air wet-bulb temperature.
The overall pump and fan efficiency is the ratio power gained by the fluid to the shaft power supplied.
Calculate electric motor efficiency.
Classification of heat recovery efficiencies - temperature efficiency, moisture efficiency and enthalpy efficiency - online heat exchanger efficiency calculator.
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