Questions tagged [energy-efficiency]

The percentage ratio of energy produced to energy supplied to a system; or a measure of minimum energy required relative to energy actually consumed; or a measure of relative energy consumed to provide the same energy service.

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Biomass: Digestor/Reactor vs Gasifier Efficiency

When using biomass for energy, two popular options are reactors and gasifiers. The first uses anaerobic micro organisms to convert the biomass to fertilizer and a methane rich gas mixture. The second ...
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Is an air to water heat pump appropriate to keep a hot tub at temperature throughout the year (hot tub to run 24/7)

Is an air to water heat pump appropriate to keep a hot tub at temperature throughout the year (hot tub to run 24/7). Presumably if the efficiency is greater than 1 even at the lowest temperatures (say ...
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Is there any case where plant farming is more eco friendly than raising livestock?

I am looking for an example or a case with arguments that would justify converting cattle ranches into plant farms (e.g., wheat, apple, or anything non-meat). The advantages should be in a more ...