Human equivalent

Human equivalent

The human equivalent (H-e) indicates, for a given amount of energy expenditure, the relative quantity of energy needed for human metabolism, assuming an average human energy expenditure of 12,500kJ per day and a basal metabolic rate of 80 watts. [Cross, R. & Spencer, R. 2008. "Sustainable gardens". CSIRO Publishing, Collingwood, Melbourne. ISBN 0 643 09422 2]

For example, if our bodies run (on average) at 80 watts, then a light bulb running at 100 watts is running at 1.25 human equivalents (100 ÷ 80) i.e. 1.25 H-e.

The human equivalent assists understanding of energy flows in physical and biological systems by expressing energy units in human terms: it provides a “feel” for the use of a given amount of energy. A professional cyclist can maintain a rate of energy use of 400 watts, or 5 H-e, for a prolonged period.

ee also

*Carbon accounting
*Emission standard
*Global warming potential
*Carbon dioxide equivalent

Reference


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