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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The systems must be able to maintain these conditions within the expected range of indoor and ashhrae operating conditions. This table can be used together with the previous one, so that one can add or subtract the clothing ensemble from the clo value of each garment.

Interpretations for Standard 55-2004

If that number is between 20 and 45, the minimum number of responses is There should be at least seven points on the scale ending with “very acceptable” and “very unacceptable. For occupant-controlled naturally conditioned spaces, the measured results shall be check with the comfort zone established by adaptive model.

This page was last edited on 12 Septemberat 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. Ashrar the first form, different individuals wear different clothing due ashae factors that are not related to thermal conditions, and the second form is opposite. Thus, it only provides an approximation of the clothing insulation value of a moving person.


Thermal comfort is the condition of mind that expresses satisfaction with the thermal environment and is assessed by subjective evaluation. ashra

ASHRAE 55 – Wikipedia

The ashhrae need to be adjusted for standing persons. Retrieved 5 December Section 7 underwent major revisions for measuring thermal comfort in existing spaces including procedures for physical measurements and survey methods, and how to ashgae and report results. It was revised in,and All of 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.

As metabolic rates increase over 1. Accurate data from 555-2004 measurement using thermal manikins is acceptable. It is defined as per unit of skin surface area which equals to This is the energy produced from a unit skin surface area of an average person seated at rest.

The measurement locations should be where the occupants are expected to spend time in. There are two cases when evaluating thermal comfort: The standard reminds the users that they should use their own judgment to 55-20004 the activities being considered to the comparable activities in the table.

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.

Interpretations for Standard

If the clothing ensemble in question reasonably matches the clothing ensemble in the table, the indicated value can be used. And this equation is only valid when the metabolic rate is between 1.


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. If there are multiple such locations, the measurement can be aashrae at a representative location.

The third method is to add all the clo value of each garment to match the clothing ensemble in question. These values are valid for an average adult with surface skin area of 1.

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.

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” aahrae the total number of votes in that questions.

To demonstrate compliance the following must be documented, where applicable. It was first published inand since has been updated every three to six years.

It is also specified that the methods provided by this standard are no longer valid when the clothing insulation exceed 1. As described within the standard: 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