ASHRAE 55-2007 PDF

ASHRAE 55-2007 PDF

ANSI/ASHRAE Standard (Supersedes ANSI/ASHRAE Standard ) ASHRAE STANDARD Thermal Environmental Conditions. CBE Thermal Comfort tool to calculate thermal comfort according to ASHRAE Standard , ASHRAE standard 55 thermal comfort tool, thermal comfort. See Appendix I for approval dates by the ASHRAE Standards Committee, the ASHRAE an ASHRAE Standard may be purchased from the ASHRAE Web site .

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Standard 55 – Thermal Environmental Conditions for Human Occupancy

Complete plans, descriptions, component literature, and 552-007 and maintenance instructions for the building systems should be provided and maintained.

A number of other, secondary factors affect comfort in some circumstances.

As metabolic rates increase above 1. This chart represents only two variables, dry-bulb temperature and relative humidity. 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. Aahrae stratification in the opposite direction is rare, is perceived more favorably by occupants, and ashfae not addressed in this standard.

Variations that occur over a period greater than three minutes shall be treated as multiple different air speeds. The last 55–2007 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. Use this section to evaluate existing thermal environments with respect to this standard.

An accompanying table lists provisions for higher operative temperatures at air speeds above 0. Using radiant cooled floors to condition large spaces and asheae comfort conditions. In the first form, different individuals wear different clothing due to factors unrelated to the thermal conditions.

There are no established lower humidity limits for thermal comfort; consequently, asyrae standard does not specify a minimum humidity level. This decrease may be offset by insulation provided by the chair. If the requirements are not met for some known set of occupants, then these occupants must be identified. No, spaces with a time-averaged metabolic rate above 2.

Any application of this standard must ashgae state which of these sections is used. If you are wearing articles of clothing not listed in the Clothing Insulation Summary: SinceStandard 55 has been rewritten with a renewed focus on application of the standard by practitioners and use of clear, enforceable language.


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.

Drybulb temperature at still air. The thermal radiation field about the body may be nonuniform due to hot and cold surfaces and direct sunlight. It is spatially and temporally averaged in the same manner as air temperature.

The indicated increase in temperature pertains to both the mean radiant temperature and the air temperature. The most recent version of the standard was published in In the first form, different individuals wear different clothing due to factors that are not related to thermal conditions, and the second form ashraee opposite. These garments may be added to or subtracted 55–2007 the ensembles in Table B1 to estimate the insulation of ensembles aahrae differ in garment composition from those in Table B1.

Values assumed for comfort parameters used in calculation of design temperatures, including clothing and metabolic rate, should be clearly stated. If the period of the fluctuation cycle exceeds 15 minutes, the variation is treated as a drift or ramp in operative temperature, and the requirements of Section 5. Some of the data in this table are reported as a range, and some as a single value.

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. Ramspeck, Manager of Standards Frank E. Every activity that may 555-2007 of interest is not included in this table.

Recommendations for seasonal settings on these controls should be stated, along with the degree of manual change that should be made at any one time, and the waiting time between adjustments when trying to fine-tune the system.

The measurement locations should be where the occupants are expected to spend time in. Conversely, elevated air speed is more effective at increasing heat loss when the mean radiant temperature is asyrae and the air temperature is low. Additionally, the mechanical systems, control systems, and thermal envelopes shall be designed so that they are ahrae to wshrae the space at conditions within the range specified in this standard at all combinations of less extreme conditions that are expected to occur.


Standing activity measurements shall be made at the 0. Comfort limits for heated ceilings. Full-scale laboratory testing may provide a more controlled validation, however. Submit an e-mail or a CD containing the change proposal files to: Because it is not possible to prescribe the metabolic rate of occupants, and because of variations in occupant clothing levels, operating setpoints for buildings cannot be ahsrae mandated by this standard.

Standard 55 – Thermal Environmental Conditions for Human Occupancy

In occupied rooms, measurements shall be taken at a representative sample of occupant locations spread throughout the occupied zone. Relative humidity of the air and ocular discomfort in a group of susceptible office workers.

Humidity is a general reference to the moisture content of the air. These values may be used in the above ashae when the turbulence intensity is not measured. After the body of the standard there are 11 informative appendices. Use the appropriate file format for your word processor and save the file in either a recent version of Microsoft Word preferred or another commonly used word-processing program.

Store Resources Education Directory Articles. This standard recommends a specific percentage of occupants that constitutes acceptability and values of the thermal environment associated with this percentage. It is acceptable to interpolate between curves for intermediate differences. For all activities except sedentary activities, the metabolic rate for a given activity is likely to have a substantial range of variation that depends on the individual performing 55-2007 task and the circumstances under which the task is performed.