ANSI/ASHRAE Standard (Supersedes ANSI/ASHRAE Standard ) ASHRAE STANDARD Thermal Environmental Conditions. CBE Thermal Comfort tool to calculate thermal comfort according to ASHRAE Standard , ASHRAE standard 55 thermal comfort tool, thermal comfort. See Appendix I for approval dates by the ASHRAE Standards Committee, the ASHRAE an ASHRAE Standard may be purchased from the ASHRAE Web site .

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Metabolic rate is the rate of transformation of chemical energy into heat and mechanical work by metabolic activities of an individual. The space may be provided with a heating system, but this optional method does not apply when the heating system is in operation.

I understand that I acquire no rights in publication of the standard in which my proposals in this or other analogous form is used. In our attempt to deliver a superior experience, we no longer support Internet Explorer versions 7 and older.

Thermal comfort – compliance

Prevailing mean outdoor temperature. General Thermal Comfort Check the one that is most appropriate 1. When occupants do not have control over the cyclical variation or drifts in indoor environmental conditions, the conditions within this section must be met.

The radiant asymmetry is determined at waist level—0. Relative humidity Humidity ratio w Dew point Wet bulb Vapor pressure. It is a single value for the entire body and may be considered a spatial average of the temperature of surfaces surrounding the occupant weighted by their view factors with respect to the occupant.

Thermal comfort requirements for floors. The effect of prior exposure or activity may affect comfort perceptions for approximately one hour. In either case, measurements shall be taken in locations where the most extreme values of the thermal parameters are estimated or observed to occur.

The survey shall be distributed to the entire occupancy or representative part of the occupancy. The allowable differences in air temperature from the ankle level to the head level may be determined from Table 5. This signifies the concurrence of more than a simple majority, but not necessarily unanimity. Because there are large variations, both physiologically and psychologically, from person to person, it is difficult to satisfy everyone in a space.


Verify satisfactory air speed 55-20007 a group of readings asshrae at a strategic location within the space. The required air speed may not be higher than 0. However, extensive laboratory and field data have been collected that provide the necessary statistical data to define conditions that a specified percentage of occupants will find thermally comfortable.

In the standard underwent significant changes with the addition of two thermal comfort models: The revision is a consensus standard that has undergone public and ASHRAE review; it incorporates the relevant research and experience ashhrae since the revision. Standard 55 specifies conditions for acceptable thermal environments and is intended for use in design, operation, and commissioning of buildings and other occupied spaces.

There should be at least seven points on the scale ending with “very acceptable” and “very unacceptable. K Seated Quite 3. However, the conditions required 55-20007 thermal comfort in spaces that are naturally conditioned are not necessarily the same as those conditions required for other indoor spaces.

However, multiple locations around the body may be included to determine a better average. SinceStandard 55 has been rewritten with a renewed focus on application of the standard by practitioners and use of clear, enforceable ashraae.

Our “watch” feature allows you to stay current on all aspects of this specific credit. A occupant-controlled naturally conditioned space is where the thermal conditions of the space are primarily regulated by occupant-controlled openings.

The method in this section may be ashraae to spaces where the occupants have activity levels that result in average metabolic rates between 1. The second method for evaluating the comfort conditions is to analyze specific environmental data for compliance with the requirements of this standard. It may be expressed in terms of several thermodynamic variables, including vapor pressure, dew-point temperature, and humidity ratio.


The methods are listed in order of accuracy and should be used in this order of preference. I insert namethrough this electronic signature, hereby grant the American Society of Heating, Refrigerating and Air-Conditioning Engineers ASHRAE the non-exclusive royalty rights, including non-exclusive rights in copyright, in my proposals. The activity and clothing of the occupants must be considered in applying this standard.

There is no minimum number of occupants required for a LEED rating. When the number is under 20, at least 16 must reply for the survey to make the survey representative. Whichever method of validating the thermal environment is chosen, the process shall be well documented. Retrieved 24 November The surface area of an average person is 1. Consensus requires that all views and objections be considered, and that an effort be made toward their resolution.

Intermediate, equally spaced zshrae may also be included in the average. 55-20077

Preferred air speeds for comfort in warm conditions. Thermal stratification that results in the air temperature at the head level being warmer than at the ankle level may cause thermal discomfort.

Standard 55 – Thermal Environmental Conditions for Human Occupancy

The measuring period for determining the average air speed at any location shall be three minutes. The second is to technically establish comfort 55-2070 through ashae analysis of environment variables.

This chart represents only two variables, dry-bulb temperature and relative humidity. Based on work at Center for the Built Environment. For VAV systems, readings shall be taken at maximum flow with minimum supply air temperature.

We welcome and value the opinions of our green building community. Time averaging of metabolic rates only applies to an individual. No humidity or air speed limits are required when this option is used.