How do you find the source in eui?

The energy source represents the total amount of crude fuel needed to operate the building. It incorporates all transmission, delivery and production. The EPA has determined that the energy source is the most equitable evaluation unit for comparing different buildings with each other. It incorporates all transmission, delivery and production losses.

By taking into account all energy use, the score provides a comprehensive assessment of a building's energy efficiency. For property types in Portfolio Manager, EUI is expressed as energy per square foot per year. It is calculated by dividing the total energy consumed by the building in a year (measured in KBtu or GJ) by the total gross floor area of the building (measured in square feet or square meters). Portfolio Manager automatically performs the conversion to KBtu or GJ, so you can enter energy usage information as you receive it on your utility bills.

Energy Use Intensity (EUI) represents the relative efficiency of a building's energy use. The EUI combines all energy sources and divides them by the square footage of the building. The EUI makes it possible to compare the energy of the building with that of other buildings of the same type. This analysis will compare the calculated EUI with the median EUI for a building of the same type within the United States.

I believe that ENERGY STAR's source energy figures use a set of national conversion factors to calculate source energy from site energy for everyone. When any form of primary or secondary energy is consumed on site, energy source calculations take into account losses incurred in the production, transmission and delivery of that energy to the building. After you benchmark your building, you'll see several performance metrics, including source and site EUI (or intensity of energy use). It incorporates all the transmission, delivery and production losses of transportation involved in bringing the energy source to the building, as well as the energy used in operations.

I think eQuest (DOE) has a multiplier of three, so 1 million kWh SITE becomes 3 million kWh SOURCE. Energy Star likely has its OWN multiplier for the carbon footprint, so use your bills (Site Energy), unless you have already calculated the SOURCE energy for you. This comprehensive white paper provides details on the distinction between site and source energy and the value of performing source energy comparisons. Both the site and source EUI are available in Portfolio Manager, although the EPA relies on the source EUI as the basis for the ENERGY STAR score.

The factors used to rethink primary and secondary energy in terms of total equivalent source energy units are called source-site relationships. If you use the ENERGY STAR portfolio manager, all energy and emissions figures for the source will be sent to you based on your site's energy inputs and building characteristics.

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