ANSI/ASHRAE Standard Thermal. Environmental. Conditions for. Human Occupancy. See Appendix I for approval dates by the ASHRAE Standards. ANSI/ASHRAE Standard Thermal Environmental Conditions for Human Occupancy is an .. ANSI/ASHRAE Standard Standard references ( Appendix H) Provides a list of references in the version of the standard, with direct. Get this from a library! ANSI/ASHRAE standard thermal environmental conditions for human occupancy.

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These are not part of the standard, but provide additional information about terms and methods described within the standard, as well as a bibliography, and a description of the addenda incorporated from the previous version in the current version.

Views Read Edit View history. Metabolic rate is the rate of transformation of chemical energy into heat and mechanical work by metabolic activities of an individual, per unit of skin surface are expressed in units of met equal to This page was last edited on 12 Septemberat Standard 55 specifies conditions for acceptable thermal environments and is intended for use in design, operation, and commissioning of buildings and other occupied spaces.

The second method is to add or subtract individual garment clo value to achieve the clothing ensemble in question.

If there are multiple such locations, the measurement can be performed at a representative location. In order to achieve acceptable results, the standard also suggests the minimum equipment accuracy based the current industry standard. When occupant is sitting, one has to realize the insulation effect of the chair, and the decrease of insulation due to compression of the air in the clothing. Comfort zone refers to the combinations of air temperature, mean radiant temperature trand humidity that are predicted to be an acceptable thermal environment at particular values of air speed, metabolic rate, and clothing insulation I cl [1].

Retrieved 5 December The measured results should be evaluated against the adjusted comfort zone for the specific building. And this equation is only valid when the metabolic rate is between 1. As described within the standard: In the standard underwent significant changes with the addition of two thermal comfort models: Exceedance hour is the number of occupied hours within a defined time period in which the environmental conditions in an occupied space are outside the comfort zone.

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For a mechanically conditioned space at an instance in time, the PMV and SET model shall be used to establish the comfort zone, and the local thermal discomfort shall be evaluated against the limit posed this standard as well.

Standard 55 – Thermal Environmental Conditions for Human Occupancy

Clothing insulation is the resistance to sensible heat transfer provided by a clothing ensemble expressed in units of clo, which is a unit to quantify the insulation provided by garments and clothing ensembles. The standard suggests that the time of measurements should last two or more hours long, and it should also be a representative time of the year for this specific building.

For the first, it is not correct to use the average clothing insulation value to determine the occupahcy thermal conditions for all occupants. One can also take into account the posture of the occupants. The measurement locations should be where the occupants are expected to spend time in. If the occupant is moving, it also affects the insulation value of clothing. As metabolic rates increase over 1.

It is also specified that the methods provided by this standard are no longer valid when the clothing insulation exceed 1. The systems must be able to maintain these conditions within the expected range of indoor and outdoor operating conditions. Environ,ental is a function to determine the representative clothing insulation at each segment.

When the number is under 20, at least 16 must reply for the survey to make the survey representative.

For satisfaction surveys, the thermal satisfaction scale shall end with choices: Accurate data from the measurement using thermal manikins is acceptable.

The standard addresses the four primary environmental factors temperaturethermal radiationhumidityand air speed and two personal factors activity and clothing that affect thermal comfort. This approximation is an equation that relates the clothing insulation with the metabolic rate.

This section of the standard is applicable for the design of buildings. For this model the standard provides a graph of acceptable indoor temperature limits at prevailing mean outdoor temperatures a mean of the daily mean outdoor temperatures of the previous 7—30 days.

Except sedentary activities, metabolic rate for all other activities is likely to have range of variation. Given the widespread and easy accessibility of computing power and third-party implementations of the analytical method, it is expected that more users will favor the comprehensive analytical methods over the graphical environkental.


The standard has a separate method for determining acceptable thermal conditions in occupant-controlled naturally conditioned spaces.

ASHRAE 55 – Wikipedia

Generally, the evaluation of comfort in existing buildings can be performed from two perspectives: In the standard was updated with more extensive information on measurement protocols and an expanded definitions section.

By using this site, you agree to the Terms of Use and Privacy Policy. A occupant-controlled naturally conditioned space is where the thermal environmsntal of the space are primarily regulated by occupant-controlled openings. All of the building systems must be designed to maintain the occupied spaces at the indoor conditions specified by one of the described evaluation methods at design conditions. And it is also not valid when occupants wear clothing that is highly impermeable to moisture transport.

Home Technical Resources Bookstore. Radiant temperature asymmetry between ceiling and floor, and air and walls must be limited to reduce discomfort. It also added a general satisfaction survey to section 7 intended to evaluate general thermal comfort coneitions an occupied space, bringing the standard in line with current survey-based post-occupancy evaluation POE practices. The applicability of the cooling effect of air movement was expanded to apply to naturally conditioned spaces.

The answers of open-ended questions from “very dissatisfied” occupants should be documented for later analysis. For an occupant-controlled naturally conditioned space, the exceedance enivronmental are the sum of hours when the operative temperature falls outside of the lower and upper boundaries of the comfort zone.

The third method is to add environmmental the clo value of each garment to match the clothing ensemble in question. For seating occupants, the air temperature and envirojmental speed measurements shall be taken at heights of 0. Metabolic rate is the rate of transformation of chemical energy into heat and mechanical work by metabolic activities of an individual. Operative temperatures may not fluctuate more than 1.