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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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The systems must be able to maintain these conditions within the expected axhrae of indoor and outdoor operating conditions. It was first published inand since has been updated every three to six years.

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.

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.

Operative temperatures may not fluctuate more than 1. The function line has four segments: The answers of open-ended questions from “very dissatisfied” occupants should be documented for later analysis. Heating, ventilating, and air conditioning Building engineering Heat transfer Architecture Architecture occupations.

Clothing insulation refers to the heat transfer of the entire body, which includes the uncovered parts, such as hands and heads.

SinceStandard 55 has been rewritten with a cor focus on application of the standard by practitioners and use of clear, enforceable language. So far, all the clothing insulation value can be used when the occupant is standing.

ASHRAE 55 – Wikipedia

The survey shall be distributed to the entire occupancy or representative part of the occupancy. And this equation is only valid when the metabolic rate is between 1. For occupant-controlled naturally conditioned space, the adaptive standatd shall be used to determine the thermal comfort boundaries. In the standard was updated with more extensive information on measurement protocols and an expanded definitions section. 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.


One has to keep in mind that the results from point-in-time surveys are only effective during the time when the surveys were solicited. Retrieved from ” https: The second method is to add or subtract individual garment clo value to achieve the clothing ensemble in question.

Standard 55 – Thermal Environmental Conditions for Human Occupancy

When the number is under 20, at least 16 must reply for the survey xonditions make the survey representative. There are two cases when evaluating thermal comfort: For occupant-controlled naturally conditioned spaces, the measured results shall be check with the comfort zone established by adaptive model. Accurate data from the measurement using thermal manikins is acceptable.

This sgandard of the standard is applicable for the design of buildings. Except sedentary activities, metabolic rate for all other activities is likely to have range of variation. 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.

When extracting environmental data from the Building Administration System, one should evaluate the location, height, and time step of the sensors based on the previous suggestion. These values are valid for an average adult with surface skin area of 1.

An accompanying table lists provisions for higher operative temperatures at air speeds above 0. The standard addresses the four primary environmental factors temperaturethermal radiationhumidityand air speed and two personal factors activity and clothing that affect thermal comfort.

As for point-in-time surveys, the survey should be solicited during the time of occupancy, and the satisfaction scale ought to be continuous. As metabolic rates increase over 1. The most recent version of the standard was published in The measurement locations should be where the occupants are expected to spend time in. 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 ashra the addenda incorporated from the previous version in the current version.

Thermal comfort is the condition of mind that expresses satisfaction with the thermal environment and is assessed by subjective evaluation. 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.


When the duration of an activity is equal or less than one hour, one can use a time-weighted metabolic rate. In general, body motion decreases the clothing insulation by pumping air through clothing. 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 method. The comfort zone boundaries must be adjusted to the air movements, and the zone conditions should be adjusted to avoid local clnditions discomfort.

Adaptive model is a model that relates indoor design temperatures or acceptable temperature ranges to outdoor meteorological or standxrd parameters.

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.

Measuring ashraw step should be no more than five minutes for air temperature, mean radiant temperature, and humidity, and no more than three minutes for the air speed.

In the first form, different individuals wear different clothing due to factors that are not related to thermal conditions, and the second form is opposite.

For thermal comfort—this is the standard. One can also take into account the posture of the occupants. To demonstrate compliance the following must be documented, where applicable.

The standard reminds the users that they should use their own judgment to match the activities being considered to the comparable activities in the table. For an occupant-controlled naturally conditioned space, the exceedance hours are the sum of hours when the operative temperature falls outside of the lower and upper boundaries of the comfort zone.