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What does the y-offset of the best fit to the performance curve mean?

April 26, 2017best curve fit mean PERFORMANCE

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What does the y-offset of the best fit to the performance curve mean?

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The y-offset of the best fit to the performance curve is an indication of the energy used in the building that is not a function of external temperature. It is usually water heating and any other gas appliances such as cooking that have a low or zero external temperature dependence. It is measured in kWh/m2/week.