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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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As metabolic rates increase over 1. Adaptive model is a model that relates indoor design temperatures or acceptable temperature ranges to outdoor meteorological or climatological parameters. For thermal comfort—this is the standard. To evaluate the probability of satisfaction from satisfaction surveys, the standard suggests dividing the number of the votes falling between “just satisfied” and “very satisfied” by the total number of votes in that questions.

Indoor thermal comfort can be determined from the responses of the occupant survey.

If that number is between 20 and 45, the minimum number of responses is It was revised in,and Operative temperatures may not fluctuate more than 1. Compliance is achieved if the conditions provide thermal neutrality, measured as falling between Retrieved 24 November Clnditions measured results should be evaluated against the adjusted comfort zone for the specific building. Clothing insulation refers to the heat transfer of the entire body, which includes the uncovered parts, such as hands and heads.

Standard 55 – Thermal Environmental Conditions for Human Occupancy

The answers of open-ended questions from “very dissatisfied” occupants should be documented for later analysis. There should be at least seven points on the scale ending with “very acceptable” and “very unacceptable. Standard 55 specifies conditions for acceptable thermal environments and is intended for use in design, operation, and commissioning of buildings and other occupied spaces.


For satisfaction surveys, the thermal satisfaction scale shall end with choices: The graph is valid for prevailing mean temperatures between 10— When the number is under 20, at least 16 must reply for the survey to make the survey representative.

A occupant-controlled naturally conditioned space standardd where the thermal conditions of the space are primarily regulated by occupant-controlled openings. 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.

For such spaces, the indoor and outdoor air temperature and mean radiant temperature and the air speed need to be measured. For the first, it is not correct to use the average clothing insulation value to determine the desired thermal conditions for all occupants. As for point-in-time surveys, the survey should be solicited during the time of occupancy, and the satisfaction ocupancy ought to be continuous. 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].

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. When such measurement is not feasible, this standard provides four methods to determine the clothing insulation.

ASHRAE 55 – Wikipedia

And it is also not valid when occupants wear clothing that is highly impermeable to moisture transport. For mechanically conditioned spaces, the PMV-based comfort zone has to be determined, which includes measuring and recording the metabolic activity and clothing insulation. This method is based on the concept that when occupants choose their clothing according to their environment, the outdoor environment is more influential than the indoor one.


Accurate data from the measurement using thermal manikins is acceptable. For occupant-controlled naturally conditioned space, the adaptive model shall be used to determine the thermal comfort boundaries.

The methodology is based on the SET Standard Effective Temperature model, which provides a way to assign an effective temperature at a standard metabolic rate, and clothing insulation values to compare thermal sensations experienced at a range of thermal conditions.

Views Read Edit View history. 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.

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. environmentaal

Standard 55 – Thermal Environmental Conditions for Human Occupancy

There is a figure in the section five of the standard which predicts the representative clothing insulation thermla the occupants as a function of the average outdoor air temperature at For occupant-controlled naturally conditioned spaces, the measured results shall be check with the comfort zone established by adaptive model.

So far, all the clothing insulation value can be used when the occupant is standing. The standard addresses the four primary environmental factors temperaturethermal radiationhumidityand air speed and two personal factors activity and clothing that affect thermal comfort.