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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This page was last edited on 12 Septemberat Views Read Edit View history. For mechanically fof spaces, the PMV-based comfort zone has to be determined, which includes measuring and recording the metabolic activity and clothing insulation.

If that number is between 20 and 45, the minimum number of responses is Documentation requirements to show that a design complies with Standard 55 are contained in Section 6, and a sample compliance form is provided in Appendix K.

For occupant-controlled naturally conditioned space, the adaptive model shall be used to determine the thermal comfort boundaries. The answers of open-ended questions from “very dissatisfied” occupants should be documented for later analysis. When such measurement is not feasible, this standard provides four methods to determine the clothing insulation.

Compliance is achieved if the conditions provide thermal neutrality, measured as falling between Retrieved 5 December For such spaces, the indoor and outdoor air temperature and mean radiant temperature and the air speed need to be measured. Accurate data from the measurement using thermal manikins is acceptable. After the body of the standard there are 11 informative appendices. 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.


In order to achieve acceptable results, the standard also suggests the minimum equipment accuracy based the current industry standard.

ASHRAE 55 – Wikipedia

To demonstrate compliance the following must be documented, where applicable. For thermal comfort—this is the standard. There are two cases when evaluating thermal comfort: For humidity ratios above 0. All of the building systems must be designed to maintain the thrrmal spaces at the indoor conditions specified by one of the described evaluation methods at design conditions.

The graphic method utilizes an overlay on a psychrometric chart to indicate the operative temperatures and humidity at which thermal comfort is stxndard in the winter 1. The last major change concerns measuring air speed and air temperature experienced by the occupant, which now must be an average across three heights and over a period of time. Metabolic rate is the rate of transformation of chemical energy into heat and mechanical work by metabolic activities of an individual.

These values are valid for an average adult with surface skin area of 1.

The measured results should be evaluated against the adjusted comfort zone for the specific building. The section sets provisions for increasing the upper air temperature limit at elevated air speeds above 0.

And it is also not valid when occupants wear clothing that is highly impermeable to moisture transport. It was revised in,and Indoor thermal comfort can be determined from the responses of the occupant survey.

Standard 55 – Thermal Environmental Conditions for Human Occupancy

When the number is under 20, at least 16 must reply for the survey to make the survey representative. It is defined as per unit of skin surface area which equals to In the first form, different individuals wear different clothing due to factors that are not related to thermal conditions, and condiitions second form is opposite.


Aviation, Space, and Environmental Medicine. 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].

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

Standard 55 – Thermal Environmental Conditions for Human Occupancy

Section 7 underwent major revisions for measuring thermal comfort in existing spaces including procedures for physical measurements and survey methods, and how to evaluate and report results. Considering that a sleeping person or one in reclining posture will be provided with sufficient insulation with the bedding material, and he or she is also free to adjust, it is impossible to determine the clothing insulation effect for these occupants unless they are immobile.

The measurement locations should be where the occupants are expected to spend time in. 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 comfort zone boundaries must be adjusted to the air movements, and the zone conditions should be adjusted to avoid local thermal discomfort.

The third method is to add all the clo value of each garment to match the clothing ensemble in question. When the duration standardd an activity is equal or less than one hour, one can use a time-weighted metabolic rate. Heating, ventilating, and air conditioning Building engineering Heat transfer Architecture Architecture occupations.