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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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Under all circumstances air speed non— directionalair temperature and humidity shall be verified. Operative temperatures may not fluctuate more than 1. 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. When the occupant is in a directed airflow, the air temperature on the upstream side should be used. Class A is used when it is desired to adhere to higher than typical comfort standards and Class C is used when it is desired to relax the typical asheae standards.

Full text of “ASHRAE 55 “

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.

Thus, it only provides an approximation of the clothing insulation value of a moving person. The computer code in Appendix D is to be used with this standard.

Thus, in practice, the requirements of Section 5 may not be met during excursions from the design conditions. The effect of prior exposure or activity may affect comfort perceptions for approximately one hour. Mean radiant temperature is defined as the temperature of a uniform, black enclosure that exchanges the same amount of thermal radiation with the occupant as the actual enclosure. 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.


The temporal average applies to all locations in the spatial average. For example, Table B2 indicates that adding a thin, long- sleeve sweater to a clothing ensemble increases clothing insulation be approximately 0.

In order to achieve acceptable results, the standard also suggests the minimum equipment accuracy based the current industry standard.

Allowable mean air speed as a function of air temperature asrae turbulence intensity for Class A and Class B thermal environments. The requirements of this section apply to all three classes of thermal environment.

Standard 55 – Thermal Environmental Conditions for Human Occupancy

It is not possible to determine the thermal insulation for most sleeping or resting situations unless the individual is immobile. For thermal comfort—this is the standard. The user of this standard must specify the class of thermal comfort.

Evaluation of the Thermal Environment 1. In the standard underwent significant changes with the addition of two thermal comfort models: For the first, it is not correct to use the average clothing insulation value to determine the desired thermal conditions for all occupants.

Radiant asymmetry shall be measured at the.

Interpretation for Standard 55-1981 and 55-1992

The use asgrae an automatic recorder is the preferred method of measurement; however it is possible to make the measurements required in this section without the use of recording equipment. The first method of environment commissioning is to statically determine occupant satisfaction through the evaluation of survey results. Tables Bl and B2 are for a person that is not moving. And it is also not valid when occupants wear clothing that is highly impermeable to moisture transport.


There is a variety of means to determine the insulation provided by clothing.

For example, some individuals may wear a sweater while others wear short— sleeve shirts in the same environment, if there are no other constraints limiting what is worn. Any application of this standard must specify the space to which it applies ashrse the locations within that space to which it applies if not the entire space. The thermal environmental conditions required for comfort are determined according to section 5.

Where the variability within a group of occupants is of the second form and is a result only of individuals freely making adjustments in clothing to suit their individual thermal preferencesit is acceptable to use a single representative average clothing insulation value for everyone in that group. Elevated air speed may be used to offset an increase in the air temperature and the mean radiant temperature by not more than 3. A specific test plan will be required to accommodate the project scope.

Any application of this standard must clearly state which of these sections is used.