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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For humidity ratios above 0.

SinceStandard 55 has been rewritten with a renewed focus on application of the standard by practitioners and use of clear, enforceable language. The heights need to be adjusted for occupancy persons. Metabolic rate is the rate of transformation of chemical energy into heat and mechanical work by metabolic activities of an individual.

Indoor thermal comfort can be determined from the responses of the occupant survey. Given the widespread and easy accessibility of computing power and third-party implementations of the analytical method, it is expected that more users will favor the comprehensive analytical methods over the graphical method.

If the clothing ensemble in question reasonably matches the clothing ensemble in the table, the indicated value can be used. Heating, ventilating, and air conditioning Building engineering Heat transfer Architecture Architecture occupations.

Standdard body of the standard consists of a foreword describing changes made in the current versioneight sections and two normative 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. For seating occupants, the air temperature and air speed measurements shall be taken at heights of 0. Accurate data from the measurement using thermal manikins is acceptable.

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.

To reduce draft risk at temperatures below The section sets provisions for increasing the upper air temperature limit at elevated air speeds above 0.

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.

For satisfaction surveys, the thermal satisfaction scale shall end with choices: For the first, it is not correct to use the average clothing insulation value to determine the desired thermal conditions for all occupants. If there are multiple such locations, the measurement can be performed at a representative location. In order to achieve acceptable results, the standard also suggests the minimum equipment accuracy based the current industry standard. Clothing insulation refers to the heat transfer of the entire body, which includes the uncovered parts, such as hands and heads.


It was first published inand since has been updated every three to six years.

As described within the standard: If the occupant is moving, it also affects the insulation value of clothing. All informative background information has been moved to informative appendices. Looking for previous revisions of this standard? When occupants do not have control over the cyclical variation or drifts occuancy indoor environmental conditions, the conditions within this section must be met.

Standard 55 – Thermal Environmental Conditions for Human Occupancy

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. Radiant conditiohs asymmetry between ceiling and floor, and air and walls must be limited to reduce discomfort. This approximation is an equation that relates the clothing insulation with the metabolic rate.

This section of the standard is applicable for the design of buildings. 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 occupant-controlled naturally conditioned spaces, the measured results shall be check with the comfort zone established by adaptive model.

An accompanying table lists provisions for higher operative temperatures at air speeds above 0. As metabolic rates increase over 1. This is the energy produced from a unit skin surface area of an average person seated at rest. To evaluate the thermal comfort over a period of time in a mechanically conditioned space, the exceedance hours are ashgae sum of all condotions hours when the absolute value of PMV is greater than 0. 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.

Standard 55 specifies conditions for acceptable thermal hunan and is intended for use in design, operation, and commissioning thermsl buildings and other occupied spaces. Retrieved from ” https: 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 Metabolic rate is the rate stajdard 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 The standard has a separate method for determining acceptable thermal conditions in occupant-controlled naturally conditioned spaces.


ASHRAE 55 – Wikipedia

By using this site, you agree to the Terms of Use and Privacy Policy. The standard suggests that the time of measurements should last two or more hours long, and it should also be a representative time of the year for this specific building. Except sedentary activities, metabolic rate for all other activities is likely to have range of variation.

It is defined as per unit of skin surface area which equals to If that number is between 20 and 45, the minimum number of responses is All of the building systems must be designed to maintain the occupied spaces at the indoor conditions specified by one of the described evaluation methods at design conditions.

Envronmental survey shall be distributed to the entire occupancy or representative part of the occupancy. 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.

For such spaces, the indoor and outdoor air temperature and mean radiant temperature and the air speed need to be measured. Requirements are now clearly stated and calculation procedures appear sequentially.

It also added a general satisfaction survey to section 7 intended to evaluate general thermal comfort in an occupied space, bringing the standard in line with current survey-based post-occupancy evaluation POE practices.

In the standard was updated with more extensive information on measurement protocols and an expanded definitions section. Views Read Edit View history. It was revised in,and