ASHRAE STANDARD 55-2010 THERMAL ENVIRONMENTAL CONDITIONS FOR HUMAN OCCUPANCY PDF

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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SinceStandard 55 has been rewritten with a renewed focus on application of the standard by practitioners and use of clear, enforceable language. For mechanically conditioned spaces, the PMV-based comfort zone has to be determined, which includes measuring and recording the metabolic activity and lccupancy insulation. 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.

One can also take into account the posture of the occupants.

Standard 55 – Thermal Environmental Conditions for Human Occupancy

These values are valid for an average adult with surface skin area of 1. It is also specified that the methods provided by this standard are no longer valid when the clothing insulation exceed 1.

Retrieved 24 November To evaluate the probability of satisfaction from satisfaction surveys, the standard suggests dividing the number of the votes falling between environmentql satisfied” and “very satisfied” by the total number of votes in that questions. Except sedentary activities, metabolic rate for all other activities is likely to have range of variation.

Standard 55 specifies conditions for acceptable thermal environments and is intended for use in design, operation, and commissioning of buildings and other occupied spaces. Metabolic rate is the rate of transformation of chemical energy into heat and mechanical work by metabolic activities of an individual, per unit of skin surface are expressed in units of met equal to Retrieved from ” https: In the standard conditionz updated with more extensive environmetal on measurement protocols and an expanded definitions section.

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In the standard underwent significant changes with the addition of two thermal comfort models: The second method is to add or subtract individual garment clo value to achieve the clothing ensemble in question.

All informative background information has been moved to informative appendices. It was first published inand since has been updated every three to environmenatl years. The section sets provisions for increasing the upper air temperature limit at elevated air speeds above 0. The comfort zone boundaries must be adjusted to the air movements, and the zone conditions should be adjusted to avoid local thermal discomfort.

If the clothing ensemble in question envidonmental matches the clothing ensemble in the table, the indicated value can be used.

Thus, it only provides an approximation of the clothing insulation value of a moving person. In general, body motion decreases the clothing insulation by pumping air through clothing. There is a variety of means to determine the insulation provided by clothing.

First, one can estimate the clothing insulation from the table provided in section five. 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 occupacy the addenda incorporated from the previous cnoditions in the current version.

Standard 55 – Thermal Environmental Conditions for Human Occupancy

For the first, it is not correct to use the average clothing insulation value to determine the desired thermal conditions for all occupants. As for point-in-time surveys, the survey should be solicited during the time of occupancy, and the satisfaction scale ought to be continuous. After the body of the standard there are 11 informative appendices. Clothing insulation is the resistance to sensible heat transfer provided by a clothing ensemble expressed in units of clo, which is a unit to quantify the insulation provided by garments and clothing ensembles.

The graph is valid for prevailing mean temperatures between 10— If the occupant is moving, it also affects the insulation value of clothing.

There are two cases when evaluating thermal comfort: For occupant-controlled naturally conditioned spaces, the measured results shall be check with the comfort zone established by adaptive model.

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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.

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.

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.

When such measurement is not feasible, this standard provides four methods to determine the clothing insulation. The heights need to be adjusted for standing persons. Sample documentation is provided in Informative Appendix J. 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.

And it is also not valid when occupants wear clothing that is highly impermeable to moisture transport. 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.

For thermal comfort—this is the standard. The applicability of cohditions cooling effect of air movement was expanded to thermla to naturally conditioned spaces. Adaptive model is a model that relates indoor design temperatures or acceptable temperature ranges to outdoor meteorological or climatological parameters.

To demonstrate compliance the following must be documented, where applicable. Measuring time step should be no more than five minutes for air temperature, mean radiant temperature, and humidity, and no more than three minutes for the air speed. Indoor thermal comfort can be determined from the responses of the occupant survey.