ANSI/ASHRAE Standard Thermal. Environmental. Conditions for. Human Occupancy. See Appendix I for approval dates by the ASHRAE Standards. 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. Get this from a library! ANSI/ASHRAE standard thermal environmental conditions for human occupancy.

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Home Technical Resources Bookstore. For occupant-controlled naturally conditioned spaces, the measured results shall be check with the comfort zone established by adaptive model. When occupants do not have control over the cyclical variation or drifts in indoor environmental conditions, the conditions within this section must be met.

It is also specified that the methods provided by this standard are no longer valid when the clothing insulation exceed 1.

For occupant-controlled naturally conditioned space, the adaptive model shall be used to determine the thermal comfort boundaries. The standard addresses occuapncy four primary environmental factors temperaturethermal radiationhumidityand air speed and two personal factors activity and clothing that affect thermal comfort.

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

Standard 55 – Thermal Environmental Conditions for Human Occupancy

And it is also not valid when occupants wear clothing that is highly impermeable to moisture transport. The survey shall be distributed to the entire occupancy or representative part of the occupancy. It is condittions as per unit of skin surface area which equals to 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.


For satisfaction surveys, the thermal satisfaction scale shall end with choices: Section 7 underwent major revisions for measuring thermal comfort in existing spaces including procedures for physical measurements and survey methods, and how to evaluate and report results.

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

The graphic method utilizes an overlay on a stwndard chart to indicate the operative temperatures and humidity at which thermal comfort is achieved in the winter 1. It was revised in,and After the body of the standard there are 11 55-010 appendices. For mechanically conditioned spaces, the PMV-based comfort zone has to be determined, which includes measuring and recording the metabolic activity and clothing insulation.

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

ASHRAE 55 – Wikipedia

Retrieved from ” https: So far, all the clothing insulation value can be used when the occupant is standing. The standard suggests that the time of measurements should last two or more hours long, and it should also be a representative time aashrae the year for this specific building.

The section sets provisions for increasing the upper air temperature limit at elevated air speeds above 0. 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. In the first form, different individuals wear different clothing due to factors that are not related to thermal conditions, and the second form is opposite.

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Standard 55 – Thermal Environmental Conditions for Human Occupancy

This section of the standard is applicable for the design of buildings. For the first, it is not correct to use the average clothing insulation value to determine the desired thermal conditions for all occupants.

The function line has four segments: To demonstrate compliance the following must be documented, where applicable. Requirements are now clearly stated and calculation procedures appear sequentially. As for point-in-time surveys, the survey should be solicited during the time of occupancy, and the satisfaction scale ought to be continuous. For such spaces, the indoor and outdoor air temperature and mean radiant temperature and the air speed need to be measured. As metabolic rates increase over 1.

The answers of open-ended questions from “very dissatisfied” occupants should be documented for later analysis. Thermal comfort is the condition of mind that expresses satisfaction with the thermal environment and is assessed by subjective evaluation.