ASHRAE-Standard-55 - Page 022
Extracted Content
Table 6-1 Thermal Environmental Control Classification Levels
| Thermal Environmental Control Classification Level | Control Measure(s) for Environmental Factors Required to Achieve Level | Informative Examples Meeting Thermal Environmental Control Classification Levels |
|---|---|---|
| 1 | Each occupant is provided two or more control measures for their personal environment. | • Private office with a ceiling fan and an occupant adjustable thermostat • Shared office with desktop fans and foot warmers for each occupant |
| 2 | Each occupant is provided one control measure for their personal environment. | • Private office with an occupant adjustable thermostat • Shared office with a desktop fan for each occupant |
| 3 | The room or thermal zone provides multioccupant control of at least two control measures in their shared environment. | • Shared office with an occupant adjustable thermostat and ceiling fan control |
| 4 | The room or thermal zone provides multioccupant control of one control measure in their shared environment. | • Shared office with an occupant adjustable thermostat |
| 5 | No occupant control of any environmental factors | • Shared or private office with an unadjustable thermostat or no thermostat |
Table 6-2 Prescriptively Compliant Personal Comfort Systems
| Col1 | Cooling |
|---|---|
| Desk fan aimed at head/face/upper body | Capable of providing air speed at the occupant’s head/face/upper body within range of 0.36 to 0.8 m/s (70.9 to 157.5 fpm) |
| Cooled chair | Capable of extracting 20 W from the body |
| Col1 | Heating |
|---|---|
| Footwarmer | Capable of adding 6 W to the body |
| Heated chair | Capable of adding 14 W to the body |
- Cooling: At design cooling condition, the measure shall change PMV by –0.5 or i. average air temperature by –3°C (–5 °F). ii. average air speed by +0.3 m/s (60 fpm). iii. mean radiant temperature by –3°C (–5 °F). iv. for personal comfort systems (PCSs), the measure shall be listed in Table 6-2 or have a minimum
corrective power of –2°C (–4°F). 2. Heating: At design heating condition, the measure shall change PMV by +0.5 or i. average air temperature by +3°C (5°F). ii. mean radiant temperature by +3°C (5°F). iii. for PCSs, the measure shall be listed in Table 6-2 or have a minimum corrective power of +2°C
(4°F). Informative Note: A single device that is capable of changing PMV in both directions ([a] and [b]) is
counted as a single control measure. For example, a thermostat that can affect the temperature in the space by –0.5 and +0.5 PMV counts as one control measure not two. 6.2 Documentation. The method and design conditions appropriate for the intended use of the building shall be selected and documented as specified in Sections 6.2.1, 6.2.2, and 6.2.3.
6.2.1 Core Documentation Requirements (applies to both Section 5.3 and Section 5.4)
a. Each unique space shall be documented. Spaces excluded from compliance documentation shall be
clearly identified as such along with the rationale for their exclusion (e.g., not regularly occupied). b. The method of design compliance shall be stated: Section 5.3 or Section 5.4. c. Each representative occupant and their location within the space shall be defined, including their cloth ing insulation ( Icl ) and metabolic rate ( met ) for each design comfort condition. Where Table 5-1 gives a
20 ANSI/ASHRAE Standard 55-2023