efficiency = useful energy output (x 100%) ÷ total energy input
- Energy transformations can be shown by Sankey diagrams.
- Energy from the source (home) is lost to the sink (environment).
- Different types of insulation cost different amounts and save different amounts of energy.
Payback time = cost of insulation ÷ annual saving
- Everything that transfers energy will waste some of the energy as heat to surroundings.
- Buildings that are energy efficient are well insulated; little energy is lost to surroundings.
- Designers and architects have to make sure that as little energy as possible is wasted.
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