What is source energy factor?

Source energy factor The unit of source energy consumed per unit of energy or fuel delivered to the installation. The EPA has determined that the energy source is the most equitable evaluation unit for comparing different buildings with each other. The energy source represents the total amount of raw fuel needed to operate the building. Incorporates all transmission, delivery and production losses.

By taking into account all energy use, the score provides a comprehensive assessment of energy efficiency in a building. Buildings use different energy mixes. Mixtures may include electricity, natural gas, fuel oil, urban steam and other sources. Each source will have its own unit of measurement (for example,.

As attested by the United States,. Environmental Protection Agency (EPA), the energy source is the most equitable evaluation unit, as it allows a complete evaluation of energy efficiency. Often, on-site energy consumption is expressed as site energy, which is the amount of heat and electricity consumed by a building as reflected in utility bills. In other words, the energy of the site is the energy used on site, as indicated by the energy meters of the building.

Comparing primary and secondary energy is faulty. They are not directly comparable because primary energy represents a raw fuel input and secondary energy indicates the converted output (which is subject to conversion losses through generation and delivery). Site energy lends itself to a simplistic comparison of relative energy consumption from one project to another, but the comparison is incomplete. When comparing the energy of the source, we will take into account the generation and delivery losses, which will allow a more complete thermodynamic evaluation.

To determine the energy source of a project, we need to determine the energy units of the site for each type of meter (fuel). The following figure illustrates source-site relationships (specific to the United States) by various types of meters as determined and used by the EPA for the ENERGY STAR Portfolio Manager tool. Consider the following alternative heating scenarios offered by the EPA. In each case, 1000 MBtu is required to heat the interior volume of the project.

Construction Scenario A uses a natural gas boiler with 90 percent combustion efficiency and 80 percent system efficiency. Construction Scenario B Uses District Steam with 95 Percent System Efficiency. Construction Scenario D Uses Electrical Resistance Heat. The energy of the site tells an incomplete story.

If we evaluate these heating options based solely on site energy, we would conclude that electrical resistance heat is more energy efficient than urban steam or a gas boiler. However, when evaluating energy source-based options, we clearly see that electrical resistance heat requires more energy input than the district's steam and natural gas options combined. In a nutshell, energy source is a more equitable comparative metric than site energy. The use of the energy source allows an evaluation of the entire building that combines all fuels fairly.

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This is a comprehensive manual that goes beyond codes and standards, and provides expert guidance on design, detailing, material selection and troubleshooting for plaster and drywall. The factors used to rethink primary and secondary energy in terms of total equivalent source energy units are called source-site relationships. Once the calculations have been completed and the total amount of source energy has been determined, the amount of source energy vs. Therefore, the entire process of energy distribution and consumption, the energy source, must be analyzed to provide a clear way to determine the most efficient means of energy production and use.

Source energy includes site energy plus all energy used to provide and distribute site energy. Once energy reaches its final source and is converted into site energy, its use is evaluated based on how much of that energy is converted into useful energy and how much is wasted. After benchmarking your building, you'll see several performance metrics, including source and site EUI (or intensity of energy use). This comprehensive white paper provides details on the distinction between site and source energy and the value of performing source energy comparisons.

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. . .

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