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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There is a variety of means to determine the insulation provided by clothing.

Interpretations for Standard 55-2004

It is also specified that the methods provided by this standard are no longer valid when the clothing insulation exceed 1. In the standard was updated with more extensive information on measurement protocols and an expanded definitions section.

By using this site, you agree to the Terms of Use and Privacy Policy. Metabolic rate is the rate of transformation of chemical energy into heat and mechanical zshrae by metabolic activities of an individual. 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.

For humidity ratios above 0. There are two cases when evaluating thermal comfort: Compliance is achieved if the conditions provide thermal neutrality, measured as falling between For the first, it is not correct to use the average clothing insulation value to determine the desired thermal conditions for all occupants. If the clothing ensemble in question reasonably matches the clothing ensemble in the table, the indicated value can be used. One can also take into account the posture of the occupants.


Considering that a sleeping person or one in reclining posture will 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.

After the body of the standard there are 11 informative appendices. Retrieved 24 November When occupant is sitting, one has to realize the insulation effect of the chair, and the decrease of insulation due to compression of the air in the clothing.

If the occupant is moving, it also affects the insulation value of clothing.

Interpretations for Standard

Clothing insulation is the resistance to sensible heat transfer provided by a clothing ensemble expressed in units of clo, which is a unit to quantify the insulation ashraf by garments and clothing ensembles. For occupant-controlled naturally conditioned spaces, the measured results shall be check with the comfort zone established by adaptive model.

Except sedentary activities, metabolic rate for all other activities is likely to have range of variation. Ashrqe such measurement is not feasible, this standard provides 55-004 methods to determine the clothing insulation. 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.

If that number is between 20 and 45, the minimum number of responses is The systems must be able to ashrqe these conditions within the expected range of indoor and outdoor operating conditions. In the body of the standard was rewritten in mandatory language, with informative language moved from the body of the standard to informative appendices.


The graphic method utilizes an overlay on a psychrometric chart to indicate the operative temperatures and humidity at which thermal comfort is achieved in the winter 1. First, one can estimate the clothing insulation from the table provided in section five.

The graph is valid for prevailing mean temperatures between 10— Accurate data from the measurement using thermal manikins is acceptable. As for ashrze surveys, the survey should be solicited during the time of occupancy, and the satisfaction scale ought to be continuous.

ASHRAE 55 – Wikipedia

Aviation, Space, and Environmental Medicine. To demonstrate compliance the following must be documented, where applicable. It is defined as per unit of skin surface area which equals to The function line has four segments: So far, all the clothing insulation value can be used when the occupant is standing. The measurement locations should be where the occupants are expected to spend time in.

The section sets provisions for increasing the upper air temperature limit at elevated air speeds above 0.

Radiant temperature asymmetry between ceiling and floor, and air and walls must be limited to reduce discomfort.