ASHRAE STD 228, 2023: Standard Method of Evaluating Zero Net Energy and Zero Net Carbon Building Performance
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Description
This standard covers
a. existing buildings, new buildings, groups of buildings, or portions of buildings
b. determination, including calculation methodology, and expression of the building(s) zero net energy status
c. determination, including calculation methodology, and expression of the building(s) zero net carbon status
d. energy and carbon emissions associated with flows across the site boundary and off-site credited flows.
The provisions of this standard do not apply to
a. establishment of building gross energy performance goals or limits
b. design guidance or design requirements
c. embodied energy or carbon of building materials and systems.
PURPOSE
This standard sets requirements for evaluating whether a building or group of buildings meets a definition of “zero net energy” or whether those buildings meet a definition of “zero net carbon.” It provides a consistent method of expressing qualifications for zero net energy and zero net carbon buildings associated with the design of new buildings and the operation of existing buildings.