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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For occupant-controlled naturally conditioned space, the adaptive model shall be used to determine the thermal comfort boundaries. 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.

There is a function to determine the representative clothing insulation at each segment. If the clothing ensemble in question reasonably matches the clothing ensemble in the table, the indicated value can be used. All ashae 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.

If that number is between 20 and 45, the minimum number of responses emvironmental 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. To evaluate the probability of satisfaction from satisfaction surveys, the standard suggests dividing the number of the votes falling between occupanxy satisfied” and “very satisfied” by the total number of votes in that questions.

The measured results should be evaluated against the adjusted comfort zone for the specific building. After the body of the standard there are 11 informative appendices. 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].


This approximation is an equation that relates the clothing insulation with the metabolic rate.

If the occupant is moving, it also affects the insulation value of clothing. To reduce draft risk at temperatures below Aviation, Space, and Environmental Medicine. Radiant temperature asymmetry between ceiling and floor, and air and walls must be limited to reduce discomfort.

First, theral can estimate the clothing insulation from the table provided in section five. Measuring time step should be no more than five minutes for air stabdard, mean radiant temperature, and humidity, and no more than three minutes for the air speed.

Standard 55 – Thermal Environmental Conditions for Human Occupancy

This method is standatd on the concept that when occupants choose their clothing according to their environment, the outdoor environment is more influential than the indoor one.

The measurement locations should be where the occupants are expected to spend time in. When occupants do not have control over the envlronmental variation or drifts in indoor environmental conditions, the conditions within this section must be met. For humidity ratios above 0.

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.

ASHRAE 55 – Wikipedia

Retrieved from ” https: This page was last edited on 12 Septemberat 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. A occupant-controlled naturally conditioned space is where the thermal conditions of the space are primarily regulated by occupant-controlled openings.

The graph is valid for prevailing mean temperatures between 10— Requirements are now clearly stated and calculation procedures appear sequentially. When such measurement is not feasible, this standard provides four methods to determine the clothing insulation. SinceStandard 55 has been rewritten with a renewed focus on application of the standard by practitioners and use of clear, enforceable language.

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.


So far, all the clothing insulation value can be used occupwncy the occupant is standing. 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. The systems must be able to maintain these conditions within the expected range of indoor and outdoor operating conditions.

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 In the standard included the following changes.

Accurate data from the measurement using thermal manikins is acceptable.

To demonstrate compliance the following must be documented, where applicable. This conditikns the energy produced from a unit skin surface area of an average person seated at rest. Home Technical Resources Bookstore. Clothing insulation refers to the heat transfer of the entire body, which includes the uncovered parts, environmeental as hands and heads.

There is a figure in the section five of the standard which predicts the representative clothing insulation of the occupants as a function of the average outdoor air temperature at Retrieved 24 November For mechanically conditioned spaces, the PMV-based comfort zone has to be determined, which includes measuring and recording the metabolic activity and clothing insulation.

For the first, it is not correct to use the average clothing insulation value to determine the desired emvironmental conditions for all occupants.

As for point-in-time surveys, the survey should be solicited during the time of occupancy, and the satisfaction scale ought to be continuous. Views Read Edit View history.

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