ASHRAE Standard 90.1 has requirements to address the energy used for heating, cooling, ventilation, interior lighting, hot water, and a few other end uses. The standard defines these components of energy use as regulated. But there is a multitude of unregulated energy use within the building that is not addressed by the standard, including:
- All the things that are plugged into convenience outlets such as personal computers, printers, coffee machines, refrigerators and desk lamps;
- Commercial refrigeration equipment such as walk-in refrigerators, walk-in freezers, and other equipment common to restaurants, food stores, and convenience stores;
- Transportation systems such as elevators, escalators, and moving walkways;
- Special ventilation systems, for instance to remove carbon monoxide from parking garages;
- Grills, ovens, fryers, steam trays, and other cooking equipment in restaurants and cafeterias;
- Compressed air systems in manufacturing and warehouse facilities; and
- Specialized equipment in laboratories, hospitals, and manufacturing plants.
Energy modelers and software developers must be able to distinguish between regulated and unregulated energy use since this is an important factor in determining the PCI target for compliance with 90.1-2016. In this case, the target performance cost index (PCIt) assumes that the unregulated energy use is neutral for both the proposed design and the baseline building, and the procedure for determining PCIt has adjustments for the percent of unregulated energy.
1.5 Type of Project Submittal
The type of project could be any one or combination of the following:
• New building
• Additions to an existing building
• Alterations of an existing building
Baseline for unmodified existing building systems or components is the same as the baseline for new systems and components except for vertical fenestration area in existing buildings, as described in Section 3.5.8. However, it is acceptable to predict performance using building models that exclude parts of the existing building, provided that all of the following conditions are met:
- Work to be performed in excluded parts of the building shall meet the requirements of Sections 5 through 10 of Standard 90.1-2019.
- Excluded parts of the building are served by HVAC systems that are entirely separate from those serving parts of the building that are included in the building model.
- Design space temperature and HVAC system operating set points and schedules on either side of the boundary between included and excluded parts of the building are essentially the same.
- If a declining block or similar utility rate is being used in the analysis, and the excluded and included parts of the building are on the same utility meter, the rate shall reflect the utility block or rate for the building plus the addition.