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# Efficiency

A general definition of efficiency is the ratio between the useful energy or power output and the energy or power input - and can be expressed as

μ = Eo / Ei                                    (1)

where

μ = efficiency

Eo = useful energy or power output(Joules, W)

Ei = energy input or power (Joules, W)

## Related Topics

### • Thermodynamics

Work, heat and energy systems.

## Related Documents

### 2nd Law of Thermodynamics

Entropy and disorder.

### Air Conditioner Efficiency

The ratio between heat removed and power (watt) used - EER and SEER.

### Boiler - Efficiency

Combustion gross and net calorific value.

### Carnot Efficiency

The efficiency of the Carnot cycle.

### Cooling and Heating - Performance and Efficiency Terminology

Performance and efficiency terminology related to heat pumps and air condition systems.

### Cooling Load - Convert between kW/ton to COP or EER

Convert between cooling load units like kW/ton, COP and EER.

### Electric Motors - Efficiency

Calculate electric motor efficiency.

### Fans - Efficiency and Power Consumption

Power consumption and typical efficiencies of fans

### Heat Pumps - Performance and Efficiency Ratings

Performance and efficiency rating of heat pumps.

### Heat Recovery Efficiency

Classification of heat recovery efficiencies - temperature efficiency, moisture efficiency and enthalpy efficiency - online heat exchanger efficiency calculator.

### Power

Power is the rate at which work is done or energy converted.

### Power Plants - Performance Efficiencies

Power plants heat rates, thermal efficiencies, capacity factors, load factors, economic efficiencies, operational efficiencies and energy efficiencies.

### Wind Power

Power generation from wind.

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