ASHRAE-90.1-2022- - Page 031
Extracted Content
| Table 3.2 Heated Space Criteria | Col2 |
|---|---|
| Climate Zone | Heating Output, Btu/h·ft2 |
| 0 | >5 |
| 1 | >5 |
| 2 | >5 |
| 3A, 3B | >9 |
| 3C | >7 |
| 4A, 4B | >10 |
| 4C | >8 |
| 5 | >12 |
| 6 | >14 |
| 7 | >16 |
| 8 | >19 |
standby power mode consumption (PW,SB): the power used by a product or appliance when enabled but in the standby operating mode (refer to 10 CFR 430).
steel-framed wall: see wall .
steel-joist floor: see floor .
story: portion of a building that is between one finished floor level and the next higher finished floor level or the roof, provided, however, that a basement or cellar shall not be considered a story.
structure: that which is built or constructed.
substantial contact: a condition where adjacent building materials are placed so that proximal surfaces are contiguous, being installed and supported so they eliminate voids between materials without compressing or degrading the thermal performance of either product.
swinging door: see door .
system: a combination of equipment and auxiliary devices (e.g., controls, accessories, interconnecting means, and terminal elements) by which energy is transformed so it performs a specific function, such as HVAC, service water heating, or lighting. ( Informative Note: This definition is not applicable to the use of this word in building envelope contexts such as, but not limited to, “curtain wall system,” “drainage system,” “fenestration system,” “framing system,” “roof system,” and “shading system.”)
task lighting: lighting directed to a specific surface or area that provides illumination for visual tasks.
temperature control throttling range: the number of degrees that room temperature must change in order to go from full heating to no heating or from full cooling to no cooling.
terminal: a device by which energy from a system is finally delivered, e.g., registers, diffusers, lighting fix- tures, faucets, etc.
thermal block: a collection of one or more HVAC zones grouped together for simulation purposes. Spaces need not be contiguous to be combined within a single thermal block .
thermal bridge: an element that has higher thermal conductivity than the surrounding materials, which creates a path of least resistance for heat transfer. For the purposes of determining building envelope requirements, the classifications for thermal bridges are defined as follows:
clear-field thermal bridge: elements of a building envelope assembly that are distributed over the area of the assembly and addressed in determining the thermal performance of the assembly in accordance with Normative Appendix A. Examples of clear-field thermal bridges include studs, webs and face shells of masonry units, ties, tracks, plates, girts and purlins for metal building envelopes, and fasteners. Fasteners used to construct assemblies in accordance with Normative Appendix A are not considered nor separately defined as point thermal bridges . linear thermal bridge: a length-based element associated with horizontal, vertical, or diagonal elements that penetrates the insulation in the building envelope and with length measured along the exterior sur
ANSI/ASHRAE/IES Standard 90.1-2022 (I-P) 29