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How are emissions estimates calculated?
How are emissions estimates calculated?

Read about how emissions estimates are calculated in the Emissions Reporting app to better understand your emission patterns.

Updated over 2 months ago

The Emissions Reporting app uses several data sources to calculate emissions estimates. For an overview of the data sources, see the table below.

Data sources

Best quality: Direct Metadata

Direct Measurement

Good quality: Proxy Data

Indirect Measurement

Lowest quality: Complete Asset Metadata

Complete Asset Metadata

Direct measurement provides the optimal calculation method through measured data inputs using a standard function for either fuel consumed for combustion engine assets, or electricity consumed for electric powered assets.

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Guidance:

  • Assets with a Data Source Score of either Excellent or Very High, are direct measurement sources.

If direct measurement data points are not available, other sources of indirect data such as load, RPM, and fuel levels are used to derive fuel or electricity consumption.

--------------------------Guidance:

  • Assets with a Data Source Score ranging from High to Very low, are indirect measurement sources and make use of Trackunit Iris to estimate usage based on years of reference data.

Information such as Make, Model, Serial Number, and other fields are used when looking up reference usage data for estimations, as well as helping specific use cases for various asset types, like scissor lifts.

--------------------------Guidance:

  • The more complete the Asset Metadata, the better the calculation. You can refer to the Data Source Score for more details on improving asset metadata.

Calculation Method

Depending on the type of data available for each asset, the calculation methods are as follows.

Direct Measurement Calculation

The calculation is based on the consumption of fuel or electricity.

If asset is electric powered:

  • Emission = kWh consumed * emissions factor

If asset is internal combustion engine powered:

  • Emission = fuel consumed * emissions factor

Indirect Measurement Calculation

Without directly measured fuel / electricity consumption data available, we analyze the available usage data, based on historical information matched to the available asset specifications to estimate fuel / electricity usage.

If asset is electric powered:

  • Emission = estimated electricity consumed * emissions factor

If asset is internal combustion engine powered:

  • Emission = estimated fuel consumed * emissions factor

What is the source for emissions factors?

CO2 emission factors are sourced from the Environmental Protection Agency (EPA), Table 2 ‘Mobile Combustion CO2which details the conversion of energy into equivalent CO2.

How are emissions estimates generated?

When asset metadata is received in Trackunit Manager (CAN or ISO feed):

  • Data Source rates the quality of received metadata and suggests improvements

  • Fuel Type selects the emissions factor based on the fuel reported

As outlined above, for indirect sources, emissions are estimated by leveraging Trackunit Iris. The Trackunit predictive model factors inputs from more than 8,000 makes & models of construction machines to ensure emissions estimates are backed by substantive real-world data. This continuous assessment also advances the Trackunit predictive model overall to eliminate downtime in construction.


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