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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Because of this variability, accurate estimates of clothing insulation for an active person are not available unless measurements are made for the specific clothing under the conditions in question e.

This optional method is intended for such spaces. The measurement locations should be where the occupants are expected to spend time in. For this model the standard provides a graph of acceptable indoor temperature limits at prevailing mean outdoor temperatures a mean of the daily mean outdoor temperatures of the previous 7—30 days.

Fluctuations that occur due to factors not under the direct control of the individual occupant e. As a minimum, the spatial average is the numerical average of the air temperature at the ankle level, the waist level, and the head level. The format for a given entry is based on the original data source and is not an indication of when a range of values should or should not be utilized. As a result, people entering a space that meets ashrwe requirements of this standard may not immediately find the conditions comfortable if they have experienced different environmental conditions just prior to entering the space.

The system shall have controls that enable it to meet comfort requirements at less than full system capacity. In this way you can see how changes asgrae MRT affect thermal comfort. The systems must be able to maintain these conditions within the expected range of indoor and outdoor operating conditions.

Cyclic variations refer to those situations where the operative temperature repeatedly rises and falls, and the period of these variations is not greater than 15 minutes. It is the difference between maximum and minimum operative temperatures measured during the same cycle, divided by the elapsed time in minutes.

ASHRAE 55 – Wikipedia

To evaluate the thermal comfort over a period 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. 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 [1].


Expressed in clo units. This standard recommends a specific percentage of occupants that constitutes acceptability and values of the thermal environment associated with this percentage. This asymmetry may cause local discomfort and reduce the thermal acceptability of the space. Assess the environment for which comfort conditions are going to be verified.

It is acceptable to interpolate between curves for intermediate differences. 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.

Typical examples might be near windows, diffuser outlets, corners, and entries. Perception of draught in ventilated spaces.

It is not possible to determine the thermal insulation for most sleeping or resting situations unless the individual is immobile. Please upgrade your browser. The sheet shall have, as a minimum, the following data for the occupant to fill in: That is, both temperatures increase by the same amount with respect to the starting point.

Most office spaces fall within these limitations. Time averaging for radiant asymmetry is the same as for mean radiant temperature. Retail Rating System Version: For mechanically conditioned spaces, the PMV-based comfort zone has to be determined, which includes measuring and recording the metabolic activity and clothing insulation.

However, energy source selection and the possible environmental impact due to the energy source and energy transportation will be considered where possible. 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. Tables B1 and B2 are for a standing person. There are no established lower humidity limits for thermal comfort; consequently, this standard does not specify a minimum humidity level.

Floor surface temperatures are to be measured with the anticipated floor coverings installed.

There is a figure in the section five of the standard which predicts the representative clothing insulation of the occupants as a function of the average outdoor air temperature at For given values of humidity, air speed, metabolic rate, and clothing insulation, a comfort zone may be determined. The system input or output capacities necessary to attain the design indoor conditions at design outdoor ambient conditions should be stated, as well as the full input or output capacities of the system as supplied and installed.


For occupant-controlled naturally conditioned space, the adaptive model shall be used to determine the thermal comfort boundaries.

Thermal comfort – compliance | U.S. Green Building Council

It is spatially and temporally averaged in the same manner as air temperature. As an ongoing goal, ASHRAE will, through its Standards Committee and extensive technical committee structure, continue to generate up-to-date standards and guidelines where appropriate and adopt, recommend, and promote those new and revised standards developed by other responsible organizations.

However, multiple locations around the body may be included to determine a better average. Effect of floor surface temperature on comfort: Thermal stratification in the opposite direction is rare, is perceived more favorably by occupants, and is not addressed in this standard.

Item computers, copiers, lighting, fans, etc. Additionally, the mechanical systems, control systems, and thermal envelopes shall be designed so that they are able to maintain the space at conditions within the range specified in this standard at all combinations of less extreme conditions that are expected to occur. 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.

For occupants engaged in near sedentary physical activity with metabolic rates between 1. Elevated air speed may be used to offset an increase in the air temperature and the mean radiant temperature, but not by more than 3.

Standard 55 – Thermal Environmental Conditions for Human Occupancy

Thermal comfort is the condition of mind that expresses satisfaction with the thermal environment and is assessed by subjective evaluation. Looking for previous revisions of 55-20007 standard?

Turbulence intensity may also be expressed in percent i.

For metabolic rates less than or equal to 1. The surface area of an average person is 1. Retrieved from ” https: