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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Interpretations for Standard 55-2004
The third method is to add all the clo value of each garment to match the clothing ensemble in question. Radiant temperature asymmetry between ceiling and floor, and air and walls must be limited to reduce discomfort. 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.
Metabolic rate is the rate of transformation of chemical energy into heat and mechanical work by metabolic activities of an individual. 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. When occupants do not have control over the cyclical variation or drifts in indoor environmental conditions, the conditions within this section must be met.
These values are valid for an average adult with surface skin area of 1. There is a function to determine the representative clothing insulation at each segment. 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.
In the standard underwent significant changes with the addition of two thermal comfort models: The most recent version of the standard was published in If the occupant is moving, it also affects the insulation value of clothing. 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. For satisfaction surveys, the thermal satisfaction scale shall end with choices: 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.
Accurate data from the measurement using thermal manikins is acceptable. 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. The applicability of the cooling effect of air movement was expanded to apply to naturally conditioned spaces.
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. The systems must be able to maintain these conditions within the expected range of indoor and outdoor operating conditions.
Heating, ventilating, and air conditioning Building engineering Heat transfer Architecture Architecture occupations.
Aviation, Space, and Environmental Medicine. Ashhrae model is a model that relates indoor design temperatures or acceptable temperature ranges to outdoor meteorological or climatological parameters. It is defined as per unit of skin surface area which equals to First, one can estimate the clothing insulation from the table provided in section five.
As metabolic rates increase over 1.
Retrieved 24 November This is the energy produced from a unit skin surface area of an average person seated at rest. So far, all the clothing insulation value can be used when the occupant is standing. The heights need to be adjusted for standing persons. 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 .
The comfort zone boundaries must be adjusted to the air movements, and the zone conditions should be adjusted to avoid local thermal discomfort.
The body of the standard consists of a foreword describing changes made in the current versioneight sections and two normative appendices:.
In the body of the standard was rewritten in mandatory language, with informative language moved from the body of the standard to informative appendices.
If the clothing ensemble in question reasonably matches the clothing ensemble in the table, the indicated value can be used. 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. This page was last edited on 12 Septemberat To demonstrate compliance the following must be documented, where applicable. This approximation is an equation that relates the clothing insulation with the metabolic rate.
Interpretations for Standard
The survey shall be distributed to the entire occupancy or representative part of the occupancy. For such spaces, the indoor and outdoor air temperature and mean radiant temperature and the air speed need to be measured. To evaluate the thermal comfort over a aahrae of time in a mechanically conditioned space, the exceedance hours are the sum of all the hours when the absolute value of PMV is greater than 0.
When the duration of an activity is equal or less than one hour, one can use a time-weighted metabolic rate. The measured results should be evaluated against the adjusted comfort zone for the specific building. Compliance is achieved if the conditions provide thermal neutrality, measured as falling between It also added wshrae 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.