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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If that number is between 20 and 45, the minimum number of responses is The answers of open-ended questions from “very dissatisfied” occupants should be documented for later analysis.

Standard 55 – Thermal Environmental Conditions for Human Occupancy

Thus, it only provides an approximation of the clothing insulation value of a moving person. Relative humidity Humidity ratio w Dew point Wet bulb Vapor pressure. In the standard underwent significant changes with the addition of two thermal comfort models: The function line has four ashraae First, one can estimate the clothing insulation from the table provided in section five.

For occupant-controlled naturally conditioned space, the adaptive model shall be used to determine ashre thermal comfort boundaries. These values are valid for an average adult with surface skin area of 1.

Standard 55 – Thermal Environmental Conditions for Human Occupancy

For this model the standard provides a graph of acceptable indoor temperature limits at prevailing mean outdoor temperatures a mean sshrae the daily mean outdoor temperatures of the previous 7—30 days. Clothing insulation refers to the heat transfer of the entire body, which includes the uncovered parts, such as hands and heads. If the occupant is moving, it also affects the insulation value of clothing.


For an occupant-controlled naturally conditioned space, the exceedance hours are the sum of hours when the operative temperature falls outside of the lower and upper boundaries of the comfort zone.

CBE Thermal Comfort Tool for ASHRAE

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. Aviation, Space, and Environmental Medicine. No local air speed control With local air speed control.

Views Read Edit View history. There is a variety of means to determine the insulation provided by clothing.

Compliance is achieved if the conditions provide thermal neutrality, measured as falling between Adaptive model is a model that relates indoor design temperatures or acceptable temperature ranges to outdoor meteorological or climatological parameters. 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 Based on work at Center for the Built Environment.

Requirements are now clearly stated and calculation procedures appear sequentially. As described within the standard: This is the energy produced from a unit skin surface area of an average person seated at rest. In general, body motion decreases the clothing insulation by pumping air through clothing.


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. The graph is valid for prevailing mean temperatures between 10— Internet Explorer is not fully supported.

For mechanically conditioned spaces, the PMV-based comfort zone has to be determined, which includes measuring and recording the metabolic activity and clothing insulation. Retrieved 24 November Exceedance hour is the number of occupied hours within a defined time period in which the environmental conditions in an occupied space are outside the comfort zone.

The measurement asnrae should be where the occupants are expected to spend time in. PMV method Adaptive method.

The most recent version of the standard was published in The body of the standard consists of a foreword describing changes made in the current versioneight sections and two normative appendices:. It was first published inand since has stadard updated every three to six years. When such measurement is not feasible, this standard provides four methods to determine the clothing insulation.

Retrieved 5 December We recommend using Chrome, Firefox, or Safari. This chart represents only two variables, dry-bulb temperature and relative humidity.