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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Please verify that all attachments and references are relevant, current, and clearly labeled to avoid processing and review delays.

Through its Handbook, appropriate chapters will contain up-to-date standards and design considerations as the material is systematically revised.

Acceptable Approximation for Operative Temperature Psychrometric chart air temperature Psychrometric chart operative temperature Temperature — Relative Humidity chart Operative Temperature — Velocity chart.

The metabolic rates associated with the activities of various individuals in a space may not be averaged to find a single, average metabolic rate to be applied to that space. PURPOSE The purpose of this standard is to specify the combinations of indoor thermal environmental factors and personal factors that will produce thermal environmental conditions acceptable to a majority of the occupants within the space.

The method and design conditions, including the design exceedance level, appropriate for the intended use of the building shall be selected and should be documented in accordance with Section 6. Therefore, an effective way to evaluate the environmental conditions is to survey the occupants. ASHRAE the nonexclusive royalty rights, including non-exclusive rights in copyright, in my proposals.

These insulation levels are typical of clothing worn when the outdoor environment is warm and cool, respectively. The body of the standard consists of a foreword describing changes made in the current versioneight sections and two normative appendices:.

Thermal comfort – compliance

The operative temperature range allowed for intermediate values of clothing insulation zshrae be determined by linear interpolation between the limits for 0. In order for this optional method to apply, the space in question must be equipped with operable windows that open to the outdoors and that can be readily opened and adjusted by the occupants of the space.


For example, the operative temperature may not change more than 2. A complete clothing ensemble may be defined using a combination of the garments listed in Table B2. These are not part of the standard, but provide additional information about terms and methods described within the standard, as well as a bibliography, and a description of the addenda incorporated from the previous version in the current version.

The space breaks down into: To cite this webpage: See Appendix A for estimation of metabolic rates and Appendix B for estimation of clothing insulation. In these situations, the requirements of Section 5. Thermal stratification that results in the air temperature at the head level being warmer than at the ankle level may cause thermal discomfort.

Typically, rest breaks scheduled or hidden or other operational factors get parts, move products, etc. Energy conservation and thermal comfort in a New York City high rise office building.

CBE Thermal Comfort Tool for ASHRAE

The graph is valid for prevailing mean temperatures between ashrqe This recognizes the impracticality of providing an HVAC system that can meet all loads under all weather or operating conditions encountered in its lifetime. If variations are created as a result of control or adjustments by the user, higher values may be acceptable.

This project inquiry applies to EQ Credit 7. 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 The insulation of the ensemble is estimated as the sum of the individual values listed in Table B2. 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 ashrar revised standards developed by other responsible organizations.

Standard 55 – Thermal Environmental Conditions for Human Occupancy

Energy Conservation Strategies in Buildings, J. The third method is to add all the clo value of each garment to match the clothing ensemble in question. The Building Services Engineer 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 preferences, it is acceptable to use a single representative average clothing insulation value for everyone in that group.


The standard is intended for use in design, commissioning, and testing of buildings and other occupied spaces and their HVAC systems and for the evaluation of thermal environments. The selected design criteria will influence the HVAC system design and may also influence the building design. 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.

Standard 55 – Thermal Environmental Conditions for Human Occupancy

These data may be used to adjust clothing insulation calculated using any of the above methods. If the MOS concludes that a current form must be utilized, the proposer may be given up to 20 additional days to resubmit the proposed changes in the current format.

Again, the method of trending must be included with this submission, if it has not been provided prior to validation, for approval. This is the energy produced from a unit skin surface area asshrae an average person seated at rest. No heating system is in operation; aehrae Metabolic rates ranging from 1.

The revision is asjrae consensus standard that has undergone public and ASHRAE review; it incorporates the relevant research and experience gained since the revision. Standing activity measurements shall be made at the 0.

In unoccupied rooms, the evaluator shall make a good faith estimate of the most significant future occupant locations within the room and make appropriate sahrae.