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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If the occupant is moving, it also affects the insulation value of clothing. When such measurement is not feasible, this standard provides four methods to determine the clothing insulation. To evaluate the thermal comfort over a period of time in a mechanically conditioned space, the exceedance hours are the sum of all the hours when the absolute value of PMV is greater than 0.

It was revised in,adhrae,and 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. In order environental achieve acceptable results, the standard also suggests the minimum equipment accuracy based the current industry standard.

For this model the standard provides a graph conditoins acceptable indoor temperature limits at prevailing mean outdoor temperatures a mean of the daily mean outdoor temperatures of the previous 7—30 days. Accurate data from the measurement using thermal manikins is acceptable.

Standard 55 – Thermal Environmental Conditions for Human Occupancy

If there are multiple such locations, the measurement can be performed at a representative location. Looking for previous revisions of this standard? From Wikipedia, the free encyclopedia. For thermal comfort—this is the standard. Metabolic rate is the rate of transformation of chemical energy into heat and ashhrae work by metabolic activities of an individual.

If the clothing ensemble in question reasonably matches the clothing ensemble in the table, the indicated value can be used. There are two cases when evaluating thermal comfort: 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.


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.

It is defined as per unit of skin surface area which equals to This section of the standard is applicable for the design of buildings.

ASHRAE 55 – Wikipedia

The most recent version of the standard was published in Retrieved 24 November There is a variety of means to determine the insulation provided by clothing. 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. If that number is between 20 and 45, the minimum number of responses is After the body of the standard there are 11 informative appendices.

There is a function to determine the representative clothing insulation at each segment. 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.

The function line has four segments: And this equation is only valid when the metabolic rate is between 1. 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. 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 One can also take into account the posture of the occupants.

In the standard included the following changes. The measured results should be evaluated against the adjusted comfort zone for the specific building. The third method is to add all the clo value of each garment to match the clothing ensemble in question. Both of these ghermal are clarified and streamlined for use by owners and third-party rating systems. 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.


This is the energy produced from a unit skin surface area of an average person seated at rest. Clothing insulation is ashrrae resistance to sensible heat transfer provided by a clothing ensemble expressed in units of clo, which is a unit to humaj the insulation provided by garments and clothing ensembles.

Standard 55 – Thermal Environmental Conditions for Human Occupancy

The standard has a separate method for determining acceptable thermal conditions in occupant-controlled naturally conditioned spaces. In the standard was updated with more extensive information on measurement protocols and an expanded definitions section. 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.

Clothing insulation refers to the heat transfer of the entire body, which includes the uncovered parts, such as hands and heads. Except sedentary activities, metabolic rate for all other activities is likely to have range of variation. Adaptive model is a model that relates indoor design temperatures or acceptable temperature ranges to outdoor meteorological or climatological parameters. 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.

First, one can estimate the clothing insulation from the table provided in section five. Sample documentation is provided in Informative Appendix J. As for point-in-time surveys, the survey should be solicited during the time of occupancy, and the satisfaction scale ought to be continuous. Thus, it only provides an approximation of the clothing insulation value of a moving person.

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

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