What is the difference between site and source energy?

The energy of the site is what the construction site consumes. The energy source is what utilities and other entities consume to supply the energy consumed by the construction site. The answer to that question lies in the difference between site energy and source energy. There are a number of losses that occur between the point at which a fossil fuel enters a power plant for conversion to electrical energy and the point at which that electrical energy reaches the meter that serves a given installation.

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. The EPA explains site versus source energy in its article Understanding Source Energy and. Both site energy and power source are useful depending on the situation.

For primary energy forms, such as natural gas, the energy of the site is, for all practical purposes, equal to the energy of the source. However, for electricity, which is a type of secondary energy or energy carrier, there can be a big difference between the amount of energy used on site and at the source to create it, so it is important to know which one to use in a given situation. Below is how we calculate site and source energy values for electricity. Here is an example of how I calculated it for New England (NPCC).

You can see that this is significantly higher than the 3412 kBtu of heat you can get from 1 kWh. For more information on EPA eGrid data usage, see our previous post on What Impact Does 1 Watt Have? Usually, electricity is just one of several forms of energy that are used in a place. To get the total energy of the site or the total source, we convert each form of energy into heat (KBtu) and add them together. Since the site and source energy fossil fuels are essentially the same, we can use the following conversion factor in the following table.

Let's return to the example of the New England Home, which consumes 1000 kWh of electricity in a month. Consider also that it uses 100 gallons of heating oil in that same month and 500 pounds of dry white oak wood, which is a little less than a quarter of cable. Now we can add up all the energy sources to calculate the total site and power source for this house in that month. You can see that the energy of the source is significantly higher than the energy of the site.

In the example we used from the New England house, it was 18% higher. In many homes, electricity is also used for heating, so the difference would be even greater than in this house that is heated with oil and wood. Now you know how to calculate both site energy and source energy for a given location or building, which will be very useful when we calculate your home MPG in our next post. Another place where it is important to distinguish between source energy and site energy is when talking about net-zero energy (or net-zero energy) buildings, as well as the discussion of electric cars.

As more of our country's electricity moves to cleaner renewable sources, such as solar and wind, the distinction between site energy and source energy. If you liked what you just read, sign up below to receive our blog posts and tips by email. It's great what you've shared with us. I have now found enough resources with your advice on this topic, thank you.

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This comprehensive white paper provides details on the distinction between site and source energy and the value of performing source energy comparisons. Energy Star Portfolio Manager has a technical reference titled Source Energy, which publishes and analyzes the factors they use in their projections. environmental protection agency (EPA), the energy source is the most equitable evaluation unit, as it allows a complete evaluation of energy efficiency. To calculate source energy from “billed” gross fuel units (kWh of electricity, gas therms), see the conversion factors in Conversions to Calculate Source Energy Usage (sidebar).

Therefore, the electric tank is half as efficient, in terms of energy source and, generally speaking, environmental impact. The energy source is the most equitable evaluation unit, allowing a comprehensive assessment of energy efficiency at the building level. The energy source was selected as the basis for comparison in Portfolio Manager specifically because it gives neither credit nor penalty to buildings that use any particular type of energy. Source energy includes site energy plus all energy used to provide and distribute site energy.

In my previous post, I mentioned that using an electric resistance coil to generate a BTU of heat can be expensive compared to burning a fossil fuel on site for the same purpose because of the difference between the energy of the site and the source. In addition, it cannot adequately account for the different fuel mixtures that may include primary energy sources (crude fuel burned on site to generate heat or electricity, and. After benchmarking your building, you'll see several performance metrics, including source and site EUI (or intensity of energy use). The EPA has determined that the energy source is the most equitable evaluation unit for comparing different buildings with each other.

Source energy is a measure that takes into account the energy consumed on site, in addition to the energy consumed during generation and transmission, when supplying power to your site. 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. The difference between the energy of the site and the source must be taken into account when looking at the energy performance of buildings, if they do not, a comparison of apples with oranges will be obtained that does not give a real picture of the energy consumption of a building. All buildings are evaluated against the same criteria, so the use of the energy source has no impact on a building's ability to score high.

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