ASHRAE 55-2004 PDF

Human Occupancy. ANSI/ASHRAE Standard Web site, http://www. , or in paper form from the Manager of Standards. The latest edition of . ANSI/ASHRAE Standard Thermal Environmental Conditions for Human Occupancy is an .. 5 December ^ Jump up to: ASHRAE Standard 55 ( ). 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 standard underwent significant changes with the addition of two thermal comfort models: The standard addresses the four primary environmental factors temperaturethermal radiationhumidityand air speed and two personal factors activity and clothing that affect thermal comfort.

When such measurement is not feasible, this standard provides four methods to determine the clothing insulation. Retrieved from ” https: For occupant-controlled naturally conditioned spaces, the measured results shall be check with the comfort zone established by adaptive ashfae.

The systems must be able to maintain these conditions within the expected range of indoor adhrae outdoor operating conditions.

In the standard included the following changes. This method is based on the concept that when occupants choose their clothing according to their environment, the outdoor environment is more influential than the indoor one.

Interpretations for Standard 55-2004

First, one can estimate the clothing insulation from the table provided in section five. When occupants do not have control over the cyclical variation or drifts in indoor environmental conditions, the conditions within this section must be met.

Retrieved 5 December In the body of the standard was rewritten in mandatory language, with informative language moved from azhrae body of the standard to informative appendices. This table can be used together with the previous one, so that one can add or subtract the clothing ensemble from the clo value of each garment.


There is a variety of means to determine the insulation provided by 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. As described within the standard: Except sedentary activities, metabolic rate for all other activities is likely to have range of variation.

Interpretations for Standard

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. Heating, ventilating, and air conditioning Building engineering Heat transfer Architecture Architecture occupations. One can also take into account the posture of the occupants. In the first form, 55-200 individuals wear different clothing due to factors that are not related ashrad thermal conditions, and the second form is opposite.

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 Thermal comfort is the condition of mind that expresses satisfaction with the thermal environment and is assessed by subjective evaluation.

The graph is valid for prevailing mean temperatures between 10— Clothing insulation refers to the heat transfer of the entire body, which includes the uncovered parts, such as hands and heads.

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

The applicability of the cooling effect of air movement was expanded to apply to naturally conditioned spaces. Sample documentation is provided in Informative Appendix J. The standard reminds the users that they should use their own judgment to match the activities being considered to the comparable activities in the table. As metabolic rates increase over 1.

If that number is between 20 and 45, the minimum number of responses is 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.


And it is also not valid when occupants wear clothing that is highly impermeable to moisture transport. The most recent version of the standard was published in For this model the standard provides a graph of acceptable indoor temperature limits at prevailing mean outdoor temperatures a mean of the daily mean outdoor temperatures of the previous 7—30 days.

A occupant-controlled naturally conditioned space is where the thermal conditions of the space are primarily regulated by occupant-controlled openings. Thus, it only provides an approximation of the clothing insulation value of a moving person. The answers of open-ended questions from “very dissatisfied” occupants should be documented for later analysis.

ASHRAE 55 – Wikipedia

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. Operative temperatures may not fluctuate more than 1. The third method is to add all the clo value of each garment to match the clothing ensemble in question.

And this equation is only valid when the metabolic rate is between 1. 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. It was revised in,and To demonstrate compliance the following must be documented, where applicable.

There are two cases when evaluating thermal comfort: It is defined as per unit of skin surface area which equals to