ASHRAE 55-1992 PDF

(Supersedes ANSI/ASHRAE Standard ). Thermal. Environmental. Conditions for. Human Occupancy. Approved by the ASHRAE Standards Committee. See Appendix I for approval dates by the ASHRAE Standards Committee, the ASHRAE an ASHRAE Standard may be purchased from the ASHRAE Web site . This standard is in close agreement with ISO Standards and Page 1 ANSI/ASHRAE Standard R Public Review Draft Table of Contents 1.

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Typically, rest breaks scheduled or hidden or other operational factors get parts, move products, etc.

55–1992 It also corresponds to a humidity ratio of 0. In the first form, different individuals wear different clothing due to factors unrelated to the thermal conditions. Draft sensation depends on the air speed, the air temperature, the turbulence intensity, the activity, and the clothing. As described within the standard: The general maintenance, operation and performance of the building systems should be stated in ashrze, followed by more specific comments on the maintenance and operation of the automatic controls and manually adjustable controls, and the response of the system to each.

ASHRAE 55 – Wikipedia

For ashare chairs, the net effect of sitting is a minimal change in clothing insulation. Users of this standard should use their judgement to match the activities being considered to comparable activities in the table.

Looking for previous revisions of this standard? Thermal stratification in the opposite direction is rare, is perceived more favorably by occupants, and is not addressed in this standard.

Table Bl lists the insulation provided by a xshrae of common clothing ensembles. The heights need to be adjusted for standing persons. Class B is for typical applications and should be used when other information is not available.

The insulation of the ensemble is estimated as the sum of the individual values listed in Table B2. The requirements of this section are the same for drifts and ramps. The standard deviation is based on individual values of 55-192 that represent an average over no more than two seconds each. Equipment Equipment adding or taking away from the heat load. The first method of environment commissioning is to statically ashrad occupant satisfaction through the evaluation of survey results.


Every activity that may be of interest is not included in this table. It is also specified that the methods provided by this standard are no longer valid when the clothing insulation exceed 1.

However, this standard ahrae also be used to determine appropriate environmental conditions for moderately elevated activity. Local discomfort asrae by warm and cool floors The limits for floor temperature are specified in Table 5. The reference point for theses curves is the upper temperature limit of the comfort zone and 0.

Standard 55 – Thermal Environmental Conditions for Human Occupancy

In order for this optional method to apply, the space in question must be equipped with operable windows which open to the outdoors and which can be readily opened and adjusted by the occupants of the space.

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. Percentage of dissatisfied due to local discomfort from various sources for different classes of thermal environment.

A time-weighted average metabolic rate may be used for individuals with activities that vary over a period of one hour or less. Recommendations for seasonal setting on these shall be stated along with the degree of manual change that should be made at any one time, and the waiting time between adjustments, in trying to fine tune the system. The standard addresses the four primary environmental factors temperaturethermal radiationhumidityand air speed and two personal factors activity and clothing that affect thermal comfort.

And it is also not valid when occupants wear clothing that is highly impermeable to moisture transport. Modification of building systems or control is often necessary to maintain the thermal environment when spaces are altered or occupancy is changed.


For occupants engaged in near sedentary physical activity with metabolic rates between 1.

Standard 55 – Thermal Environmental Conditions for Human Occupancy

However, non— thermal comfort factors such as skin drying, irritation of mucus membranes, dryness of the eyes, and static electricity generation may place limits on the acceptability of very low humidity environments. The section sets provisions for increasing the upper air temperature limit at elevated air speeds above 0.

Therefore the elevated air speed must be under the direct control of the affected occupants and adjustable in steps no greater than 0.

Time averaging and spatial averaging are the same as for air temperature. When the number is under 20, at least 16 must reply for the survey to make the survey representative. Sensitivity to draft is greatest where the skin is not covered by clothing, especially the head region comprising the head, neck and shoulders and the leg region comprising the ankles, feet and legs.

In the standard was updated with more extensive information on measurement protocols and an expanded definitions section. This verification shall include trending variables for at least one occupied cycle during each seasonal condition.

These criteria may also be used for people wearing heavier footgear but may be conservative. The function line has four segments: 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. Variations that occur over a period greater than three minutes should be treated as two different air speeds.

In the second form, the variability results from adaptation to individual differences in response to the thermal environment.

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