Utilization ratio

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In contrast to efficiency, which compares the energy input with the useful energy over a short period of time, both are related for a long period of time for the utilization ratio. Thus, an oil-fired heating system may have an efficiency of 90% reached at nominal load. If only partly utilized in the transitional period (e.g. summer) higher standstill losses occur so that a utilization ratio of only 65% annually results.

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