ASHRAE 55-2004 PDF

Human Occupancy. ANSI/ASHRAE Standard Web site, http://www. , or in paper form from the Manager of Standards. The latest edition of . ANSI/ASHRAE Standard Thermal Environmental Conditions for Human Occupancy is an .. 5 December ^ Jump up to: ASHRAE Standard 55 ( ). ANSI/ASHRAE Standard 3. It is intended that all of the criteria in this standard be applied together since comfort in the indoor environment is.

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An accompanying table lists provisions for higher operative temperatures at air speeds above 0.

Interpretations for Standard 55-2004

Compliance is achieved if the conditions provide thermal neutrality, measured as falling between When the number is under 20, at least 16 must reply for the survey to make the survey representative. And this equation is only valid when the metabolic rate is between 1. If that number is between 20 and 45, the minimum number of responses is From Wikipedia, the free encyclopedia.

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 For such spaces, the indoor and outdoor air temperature and mean radiant temperature and the air speed need to be measured.

For occupant-controlled naturally conditioned spaces, the measured results shall be check with the comfort zone established by adaptive model. If there are multiple such locations, the measurement can be performed at a representative location.


The answers of open-ended questions from “very dissatisfied” occupants should be documented for later analysis. For occupant-controlled naturally conditioned space, the adaptive model shall be used to determine the thermal comfort boundaries.

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

There should be at least seven points on the scale ending with “very acceptable” and “very unacceptable. 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 asshrae. If the occupant is moving, it also affects the insulation value of clothing.

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. To sshrae draft risk at temperatures below By using this site, you agree to the Terms of Use and Privacy Policy.

Interpretations for Standard

Retrieved from ” https: If the clothing ensemble in question reasonably matches the clothing ensemble in the table, the indicated value can be used. As for point-in-time surveys, the survey should be solicited during the time of occupancy, and the satisfaction scale ought to be continuous.

There is a function to determine the representative clothing insulation at each segment. For the first, it is not correct to use the average clothing insulation value to determine the desired thermal conditions for all occupants. A occupant-controlled naturally conditioned space is where the thermal conditions of the space are primarily regulated by occupant-controlled openings.


It is defined as per unit of skin surface area which equals to As metabolic rates increase over 1.

The standard reminds the users that they should use their own judgment to match ashraae activities being considered to the comparable activities in the table.

For seating occupants, the air temperature and air speed measurements shall be taken at heights of 0.

The section sets provisions for increasing the upper air temperature limit at elevated air speeds above 0. The function line has four segments: The second method is to add or subtract individual garment clo value to achieve the clothing ensemble in question.

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.

Except sedentary activities, metabolic rate for all other activities is likely to have range of variation. It also added a general satisfaction survey to section 7 intended to evaluate general thermal comfort in an occupied space, bringing the standard in line with current survey-based post-occupancy evaluation POE practices. The third method is to add all the clo value of each garment to match the clothing ensemble in question.