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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Generally, the evaluation of comfort in existing buildings can be performed from two perspectives: First, one can estimate the clothing insulation from the table provided in section five. For satisfaction surveys, the thermal satisfaction scale shall end with choices: This section of the asrhae is applicable for the design of buildings.
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Interpretations for Standard 55-2004
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 cl .
Clothing insulation refers to the heat transfer of the entire body, which includes the uncovered parts, such as hands and heads. The standard reminds the users that they should use their own judgment to match the activities being considered to the comparable activities in aehrae table.
When the number is under 20, at least 16 must reply for the survey to make the survey representative. The methodology is based 55-200 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.
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 by garments and clothing ensembles. For humidity ratios above 0. The measured results should be evaluated against the adjusted comfort zone for the specific building. The systems must be able to maintain these conditions within the expected range of indoor and outdoor operating conditions.
And this equation is only valid when the metabolic rate is between 1. Retrieved 24 Ashtae 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.
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 ashraae be evaluated against the limit posed this standard as well. When asrae do not have control over the cyclical variation or drifts in indoor environmental conditions, the conditions within this section must be met.
In the body of the standard was rewritten in mandatory language, with informative language moved from the body of the standard to informative appendices. All ashrse 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.
This method is based on the concept that when occupants choose their clothing according to their environment, the outdoor environment is more influential than the indoor one. The survey shall be distributed to the entire occupancy or representative part of the occupancy. When such measurement is not feasible, this standard provides four methods to determine the clothing insulation.
As for point-in-time surveys, the survey should be solicited during the time of ashgae, and the satisfaction scale ought to be continuous.
Section 7 underwent major revisions for measuring thermal comfort in existing spaces including procedures for physical measurements and survey ashrze, and how to evaluate and report results. Radiant temperature asymmetry between ceiling and floor, and air and walls must be limited to reduce discomfort.
It is also specified that the methods 55–2004 by this standard are no longer valid when the clothing insulation exceed 1. There is a variety of means to determine the insulation provided by clothing. Thus, it only provides an approximation of the clothing insulation value of a ahrae person. To reduce draft risk at temperatures below Asnrae the body of the standard there are 11 informative appendices.
The section sets provisions for increasing the upper air temperature limit at elevated air speeds above 0. Except sedentary activities, metabolic rate for all other activities is likely to have range of variation. 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 Aviation, Space, and Environmental Medicine.
ASHRAE 55 – Wikipedia
For mechanically conditioned spaces, the PMV-based comfort zone has to be determined, which includes measuring and recording the metabolic activity and clothing insulation. And it is also not valid when occupants wear clothing that is highly impermeable to moisture transport. 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 comfort zone boundaries must be adjusted to the air movements, and the zone conditions should be adjusted to avoid local thermal discomfort.
Accurate data from the measurement using thermal manikins is acceptable. When extracting environmental data ashraw the Building Administration System, one should evaluate the location, height, and time step of the sensors based on the previous suggestion.
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. Sample documentation is provided in Informative Appendix J. If there are multiple such locations, the measurement can be performed at a representative location.
The graph is valid for prevailing mean temperatures between 10— The function line has four segments: Heating, ventilating, and air conditioning Building engineering Heat transfer Architecture Architecture occupations.
It was first published inand since has been updated every three to six years. Ashre 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. This page was last edited on 12 Septemberat