ANSI/ASHRAE Standard Thermal Environmental Conditions for Human Occupancy is an .. ANSI/ASHRAE Standard Standard references ( Appendix H) Provides a list of references in the version of the standard, with direct. ANSI/ASHRAE Standard (Supersedes ANSI/ASHRAE Standard ). Includes ANSI/ASHRAE addenda listed in Appendix |. o) ASHRAE. ANSI/ASHRAE Standard 3. It is intended that all of the criteria in this standard be applied together since comfort in the indoor environment is.

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In the body of the standard was rewritten in mandatory language, with informative language moved from the body of the standard to informative appendices.

For thermal comfort—this is the standard. One has to keep in mind that the results standare point-in-time surveys are only effective during the time when the surveys were solicited. One can also take into account the posture of the occupants.

This page was last edited on 12 Septemberat This is the energy produced from a unit skin surface area of an average person seated at rest. Looking for previous revisions of this standard?

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].

Views Read Edit View history. The heights need to be adjusted for standing persons.

To cite this webpage: The PMV calculations are still based on all the psychrometric variables, staneard the visualization becomes easier to understand. The standard reminds the users that they should use their own judgment to match the activities being considered to the comparable zshrae in the table. Home Technical Resources Bookstore. The graphic method utilizes an overlay on a psychrometric chart to indicate the operative temperatures and humidity at which thermal comfort is achieved in the winter 1.

This approximation is an equation that relates the clothing insulation with the metabolic rate.


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. No local air speed control With local air speed control. The third method is to add all the clo value of each garment to match the clothing ensemble in question.

CBE Thermal Comfort Tool for ASHRAE

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 To reduce draft risk at temperatures below In order to achieve acceptable results, the standard also suggests the minimum equipment accuracy based the current industry standard.

So far, all the clothing insulation value can be used when the occupant is standing. Radiant temperature asymmetry between ceiling and floor, and air and walls must be limited to reduce discomfort. Generally, the evaluation of comfort in existing buildings can be performed from two perspectives: Thermal comfort is ashgae condition of mind that expresses satisfaction with the thermal environment and is assessed by subjective evaluation.

Adaptive model is a model that relates indoor design temperatures or acceptable temperature ranges to outdoor meteorological or climatological parameters.

Standard 55 – Thermal Environmental Conditions for Human Occupancy

The body of the standard consists of a foreword describing changes made in the current versioneight sections and two normative appendices:. A occupant-controlled naturally conditioned space is where the thermal conditions of the space are primarily regulated by occupant-controlled openings.

It is also specified that the methods provided by this standard are no longer valid when the clothing insulation exceed 1. For humidity ratios above 0. In the standard included the following changes. The standard addresses the four primary environmental factors temperaturethermal radiationhumidityand air speed and two personal factors activity and clothing that affect thermal comfort.

Standard 55 – Thermal Environmental Conditions for Human Occupancy

We recommend using Chrome, Firefox, or Safari. The comfort zone boundaries 55-2010 be adjusted to the air movements, and the zone conditions should be adjusted to avoid local thermal discomfort. If the occupant is moving, it also affects the insulation value of clothing.


Metabolic rate is the rate of transformation of chemical energy into heat and mechanical work by metabolic activities of an individual.

This section of the standard is applicable for the design of ashfae.

Aviation, Space, and Environmental Medicine. Metabolic rate is the rate of transformation of chemical energy into heat and mechanical work by metabolic activities of an individual, per unit standarv skin surface are expressed in units of met equal to Considering that a sleeping person or one in reclining posture will be provided with sufficient insulation with the bedding material, and he or she is also free to adjust, it is impossible to determine the clothing insulation effect for these occupants unless they are immobile.

Both of these sections are clarified and streamlined for use by owners and third-party rating systems. 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.

For occupant-controlled naturally conditioned space, the adaptive model shall be used to determine the thermal comfort boundaries. As metabolic rates increase over 1.

Documentation requirements to show that a design complies with Standard 55 are contained in Section 6, and a sample compliance form is provided in Appendix K.

When extracting environmental data from the Building Administration System, one should evaluate the location, height, and time step of the sensors based on the previous suggestion. Psychrometric chart air temperature Psychrometric chart operative temperature Temperature — Relative Humidity chart Operative Temperature — Velocity chart.