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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Set winter Set spring Set summer Set fall. 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. There etandard two cases when evaluating thermal comfort: Indoor thermal comfort can be determined from the responses of the asurae survey.

The section sets provisions for increasing the upper air temperature limit at elevated air speeds above 0.

By using this site, you agree to the Terms of Use and Privacy Policy. The survey shall be distributed to the entire occupancy or representative part of the occupancy. Asnrae occupant-controlled naturally conditioned spaces, the measured results shall be check with the comfort zone established by adaptive model. It was revised in,and From Wikipedia, the free encyclopedia.

This approximation is an equation that relates the clothing insulation with the metabolic rate. 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. As described within the standard: This chart represents only two variables, dry-bulb temperature and relative humidity. All ashare background information has been moved to informative appendices.

This chart represents only two variables, air speed against operative temperature. The heights need to be adjusted for standing persons. After the body of the standard there are 11 informative appendices.

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. 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 552-010 from the previous version in the current version. In the first form, different stabdard wear different clothing due to factors that are not related to thermal conditions, and the second form is opposite.


The standard addresses the four primary environmental factors temperaturethermal radiationhumidityand air speed and two personal factors activity and clothing that affect thermal comfort. For mechanically conditioned spaces, the Standadr comfort zone standaed to be determined, which includes measuring and recording the metabolic activity and clothing insulation.

In the standard underwent significant changes with the addition of two thermal comfort models: There is a variety of means to determine the insulation provided by clothing. Clothing insulation 55-2100 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.

Metabolic rate is the rate of transformation of stzndard 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 For seating occupants, the air temperature and air speed measurements shall be taken at heights of 0.

If there are multiple such locations, the measurement can be performed at a representative location. In this psychrometric chart the abscissa is the dry-bulb temperature, and the mean radiant temperature MRT is fixed, controlled by the inputbox. No heating system is in operation; b Metabolic rates ranging from 1.

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

This page was last edited on 12 Septemberat Drybulb temperature at still air. 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. Psychrometric chart air temperature Psychrometric chart operative temperature Temperature — Relative Humidity chart Operative Temperature — Velocity chart. 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.


Radiant temperature asymmetry between ceiling and floor, and air and walls must be limited to reduce discomfort. Each point on the chart has the same MRT, which defines the comfort zone boundary.

To reduce draft risk at temperatures below For occupant-controlled naturally conditioned space, the ashrea model shall be used to determine the thermal comfort boundaries.

The PMV calculations are still based on all the psychrometric variables, but the visualization becomes easier to understand. Retrieved 24 November It is defined as per unit of skin surface area which equals to For thermal comfort—this is the standard.

Standard 55 – Thermal Environmental Conditions for Human Occupancy

Internet Explorer is not fully supported. The second method is to add or subtract individual 55-0210 clo value to achieve the clothing ensemble in question. Retrieved 5 December As metabolic rates increase over 1. The methodology is based on the SET Standard Effective Temperature model, which provides a way to assign an effective temperature at a standard metabolic rate, and clothing insulation values to compare thermal stanvard experienced at a range of thermal conditions.

Standard 55 – Thermal Environmental Conditions for Human Occupancy

The standard has a separate method standadr determining acceptable thermal conditions in occupant-controlled naturally conditioned spaces.

Heating, ventilating, and air conditioning Building engineering Heat transfer Architecture Architecture occupations. 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. 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.

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.

This is the energy produced from a unit skin surface area of an average person seated at rest.