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For thermal comfort—this is the standard. Standard 55 specifies conditions for acceptable thermal environments and is intended for use in design, operation, and. ANSI/ASHRAE Standard Thermal. Environmental. Conditions for. Human Occupancy. Approved by the ASHRAE Standards Committee on June 25, . Learn more about Interpretations For Standard at

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Accurate data from the measurement using thermal manikins is acceptable. Standard 55 specifies conditions for acceptable thermal environments and is intended for ashrae standard 55-2010 in design, operation, and commissioning of buildings and other occupied spaces. It was revised in,and For seating occupants, the air temperature and air speed measurements shall be taken at heights of 0. After the ashrae standard 55-2010 of the standard there are 11 informative appendices.

Section 7 underwent major revisions for standaard thermal comfort in existing spaces including procedures for physical measurements and survey methods, and how to evaluate and report results. Metabolic rate is the rate of transformation of chemical energy into heat and mechanical work by metabolic activities of an individual. The standard has a ashrae standard 55-2010 method for determining acceptable thermal conditions in occupant-controlled naturally conditioned spaces.

For humidity ratios above 0.

For occupant-controlled naturally conditioned space, the adaptive standatd shall be used to determine the thermal comfort boundaries. 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. The comfort zone boundaries must be adjusted to the air movements, and the zone conditions should be adjusted to avoid local thermal discomfort.

Documentation requirements to show that a design complies with Standard 55 are contained in Section 6, and a sample compliance form is ashrae standard 55-2010 in Appendix K. Considering ashrae standard 55-2010 a sleeping person or one in reclining posture standardd 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.


Given the widespread and easy accessibility of computing power ashrae standard 55-2010 third-party implementations of the analytical method, it is expected that more users will favor the comprehensive analytical methods ashrae standard 55-2010 the graphical method.

Interpretations For Standard 55-2010

Ashrae standard 55-2010 most recent version of the standard was published in In general, body motion decreases the clothing insulation by pumping air through clothing. In the standard was updated with more extensive information on measurement protocols and an expanded definitions section.

A occupant-controlled naturally conditioned space is where the thermal conditions of the space are primarily regulated by occupant-controlled openings. If there are multiple such ashrae standard 55-2010, the measurement can be performed at a representative location.

One can also take into account the posture of the occupants. Except sedentary activities, metabolic rate for all other activities is ashrae standard 55-2010 to have range of variation. As described within the standard: If the occupant is moving, it also affects the insulation value of clothing.

An accompanying table lists ashrae standard 55-2010 for higher operative temperatures at air speeds above 0. 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.

The survey shall be distributed to the entire occupancy or representative part of the occupancy. In order to achieve acceptable results, the standard also suggests the minimum equipment accuracy based the current industry standard. And this equation is only valid when the metabolic rate is between 1.

Standwrd standard reminds the users that they should use their own judgment to match the activities being considered to the comparable activities in the table. Looking for previous revisions of this standard?


Measuring time step should be no more ashrae standard 55-2010 five minutes for air temperature, mean radiant temperature, and humidity, and no more than three minutes for the air speed. The measurement locations should be where ashrae standard 55-2010 occupants are expected to standarx time in. The measured results should be evaluated against the adjusted comfort zone for the specific building.

To evaluate the probability of satisfaction from satisfaction surveys, the standard suggests dividing the number of the votes falling between “just ashrae standard 55-2010 and “very satisfied” 55–2010 the total number ahrae votes in that questions. The function line has four segments: These values are valid for an average adult with surface skin area of 1. Compliance is achieved if the conditions provide thermal neutrality, measured as falling between 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.


For satisfaction surveys, the thermal satisfaction scale shall end with choices: 55-2010, ventilating, and air conditioning Building engineering Ashrae standard 55-2010 transfer Architecture Architecture occupations.

By using this site, you agree to the Terms of Use and Privacy Policy. The systems must be able to maintain 55-210 conditions within the expected range of indoor and outdoor operating conditions. The heights need to be adjusted for standing persons.

The graphic method utilizes an overlay on a psychrometric chart to indicate the operative temperatures and humidity ashrae standard 55-2010 which thermal comfort is achieved in the winter 1. For the first, it is not correct to use the average clothing insulation value to determine the desired thermal conditions for all occupants. ashrae standard 55-2010

Standard 55 – Thermal Environmental Conditions for Human Occupancy

Retrieved from ” https: For such spaces, the indoor and outdoor air temperature ashrae standard 55-2010 mean radiant temperature and the air speed need to be measured. In the standard included the following changes. Requirements are now clearly stated and calculation procedures appear sequentially. 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 standwrd [1].

All informative background information has been moved to informative appendices. Generally, the evaluation of comfort in existing buildings can be performed ashrae standard 55-2010 two perspectives: