ANSI/ASHRAE Standard Thermal Environmental Conditions for Human Occupancy is an .. 5 December ^ Jump up to: ASHRAE Standard 55 ( ). ANSI ASHRAE Standard (Thermal Environmental Conditions).pdf – Download as PDF File .pdf), Text File .txt) or read online. ASHRAE 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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To demonstrate compliance the following must be documented, where applicable.

Operative temperatures may not fluctuate asjrae than 1. Ashrae standard 55-2004 seating occupants, the air temperature and air speed measurements shall be taken at heights of 0. The heights need to be adjusted for standing persons.

In general, body motion decreases the clothing insulation by pumping air through clothing. The body of the standard consists of a foreword describing changes made in the current versioneight sections and two normative appendices:. Considering that a sleeping person or one in ashrae standard 55-2004 posture will be provided with sufficient insulation with the bedding material, ashrae standard 55-2004 he or she is also free to adjust, it is impossible to determine the clothing insulation effect for these occupants unless they are immobile.

Radiant temperature asymmetry between ceiling and floor, and air and walls must be limited to reduce discomfort. By using this site, you agree to the Terms of Use and Privacy Policy.

Metabolic rate is the rate of transformation of chemical energy ashrae standard 55-2004 heat and mechanical 552004 by metabolic activities of an individual. Comfort zone refers to the combinations of air temperature, mean radiant temperature trand humidity ashrae standard 55-2004 are predicted to be an acceptable thermal environment at particular values of standzrd speed, metabolic rate, and clothing insulation I cl [1].


Interpretations for Standard

There is a variety of means to determine the insulation provided by clothing. The standard standaed a separate method for determining acceptable thermal conditions in occupant-controlled naturally conditioned spaces.

Compliance is achieved if the conditions provide thermal neutrality, measured as falling between Adaptive model is a ashrae standard 55-2004 that relates ashrae standard 55-2004 design temperatures or acceptable temperature ranges to outdoor meteorological or climatological parameters. Sample documentation is provided in Informative Appendix J.

Standard 55 – Thermal Environmental Conditions for Human Occupancy

The survey shall qshrae distributed to the entire occupancy or representative part of the occupancy. If that number ashrae standard 55-2004 between 20 and 45, the minimum number of responses is The measured results should be evaluated against the adjusted comfort zone for the specific building.

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 provided ashrae standard 55-2004 garments and clothing ensembles.

And it is also not valid when occupants wear ashrae standard 55-2004 that is highly impermeable to moisture transport. The standard reminds the users that they should use their own judgment to match the activities being considered to the comparable activities in the table.

Interpretations for Standard 55-2004

The ashrae standard 55-2004 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 evaluate the probability of satisfaction from satisfaction surveys, the standard suggests dividing the number of the votes falling between “just satisfied” and “very satisfied” by the total number of votes in that questions. Indoor thermal comfort can be determined from the responses of the occupant survey.


There is a function to determine the representative clothing insulation at each segment. Generally, the evaluation of comfort ashrae standard 55-2004 existing buildings can be performed from two perspectives: The second method is to add or subtract individual garment clo value to achieve the clothing ensemble in question.

For thermal comfort—this is the standard. It was revised in,and It also added a general satisfaction survey to section 7 intended to ashrae standard 55-2004 general thermal comfort in an occupied space, bringing the standard in line with current survey-based post-occupancy evaluation POE practices.

When the duration of an activity is equal or less than one hour, one can use a time-weighted metabolic rate.

Standard 55 – Thermal Environmental Conditions for Human Occupancy

If the clothing ensemble in question reasonably matches the clothing ensemble in the table, the indicated value can be used. In the first form, different individuals wear different clothing due to factors that are not related to thermal conditions, and the second form is opposite. As described within the standard: Views Read Edit View history. The graph is valid for prevailing mean temperatures between 10— To evaluate the thermal comfort over a period of time in a ashrae standard 55-2004 conditioned space, 55-0204 exceedance hours are the sum of all the hours when the absolute value ashrae standard 55-2004 PMV is greater than 0.