What is TSPR?
Total System Performance Ratio (TSPR) is a performance-based compliance path for HVAC systems which is defined as:
The ratio of the sum of a building's annual heating and cooling load in thousands of Btus to the sum of the annual carbon emissions in pounds from energy consumption of the building HVAC systems.
Users may enter geometry, envelope and HVAC component inputs into the tool to create a building energy model that will used to estimate the HVAC annual energy use and carbon emissions to generate a proposed TSPR that will be compared against a baseline TSPR to determine compliance. The baseline TSPR is generated automatically by the tool by using the user’s building and replacing the HVAC system with the baseline HVAC system as defined by the 2018 Washington State Energy Code, Appendix D.
How does TSPR show compliance?
To comply with the 2018 Washington State Energy Code, the proposed system TSPR must be greater than or equal to the baseline system TSPR and meet all other prescriptive code requirements.
The TSPR tool will generate a pdf report documenting the inputs and the TSPR of the both the proposed and baseline system that may be provided to code officials to demonstrate compliance.
To access the TSPR tool, log in to Asset Score (https://buildingenergyscore.energy.gov) and navigate to TSPR. To create a building, enter inputs and generate a TSPR report, follow the steps outlined on the Getting Started page of this guide.
Where to go for Help
To assist with data entry, each screen has a Help icon that links to online User Guide help screens. An Asset Score Help Desk is also available to submit a support ticket to request additional assistance.