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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ASHRAE 55 1992

Each of these groups of occupants should be considered separately in determining the conditions ashraw for comfort. For occupant-controlled naturally conditioned spaces, the measured results shall be ashrad with the comfort zone established by adaptive model.

Such locations might be workstation or seating areas, depending on the function of the space. A occupant-controlled naturally conditioned space is where the thermal conditions of the space are primarily regulated by occupant-controlled openings. Typical examples might be near windows, diffuser outlets, corners, and entries.

Locations of all occupant adjustable controls should be identified, and each should be provided with a legend describing what zone s it controls and what function s it controls. To reduce draft risk at temperatures below For a given set of conditions, the results from the two methods are consistent and either method may be used as long as the criteria outlined in the respective section are met.


Provided adequate bedding materials are available, the thermal environmental conditions desired for sleeping and resting vary considerably from person to person and cannot be determined by the methods included in this standard. The requirements in Section 5.

Standard 55 – Thermal Environmental Conditions for Human Occupancy

Individuals will adjust the bedding so as to suit individual preferences. Compliance is achieved if the conditions provide thermal neutrality, measured as falling between Design conditions shall include an appropriate exceedence level. It is defined as per unit of asrhae surface area which equals to Air speed is the average speed of the air to which the body is exposed.

And it is also not valid when occupants wear clothing that is highly impermeable to moisture transport. Therefore, an effective way to evaluate the environmental conditions is to survey the occupants. The requirements of this section are the same for drifts and ramps. This figure applies to a lightly clothed person with clothing insulation between 0.

If there are multiple such locations, the measurement can be performed at a representative location. General guidelines for the use of these data follow.

Turbulence intensity may also be expressed in percent [i. The last major change concerns measuring air speed and air temperature experienced by the occupant, which now must be an average across three heights and over a period of time.


As described within the standard: Three classes of acceptable thermal environment for general comfort. The computer code in Appendix D is to be used with this standard.

The benefits that can be gained by increasing air speed depend on clothing and activity. Measuring time step should be no more than five minutes for air temperature, mean radiant temperature, and humidity, and no more than three minutes for the air speed. For near sedentary activities where the metabolic rate is approximately 1.

Interpretation for Standard and

Every activity that may be of interest is not included in this table. For many chairs, the net effect of sitting is a minimal change in clothing insulation.

Tables Bl and B2 are for a standing person. The standard has a separate method for determining acceptable thermal conditions in occupant-controlled naturally conditioned spaces.

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. The survey shall be distributed to the entire occupancy or representative part of the ashtae.

Hong Thermal insulation provided by chairs”.