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

ASHRAE 55 – Wikipedia

Standard 55 specifies conditions for acceptable thermal environments and is intended for use in design, operation, and commissioning of buildings and other occupied spaces. The standard reminds the users evironmental they should use their own judgment to match the activities being considered to the comparable activities in the table.

Comfort zone refers to the combinations of air temperature, mean radiant temperature trand humidity that are predicted to be an acceptable thermal environment at particular values of air speed, metabolic rate, and clothing insulation I cl [1].

For mechanically conditioned spaces, the PMV-based comfort zone has to be determined, which includes measuring and conditiosn the metabolic activity and clothing ashrze. 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. When extracting environmental data from the Building Administration System, one should evaluate the location, height, and time step of the sensors based on the previous suggestion.

The body of the standard consists of a foreword describing changes made in the current versioneight sections and two normative 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 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. If these requirements are met and the environmental conditions inside the building fall within the indicated ranges, then compliance is achieved. Home Technical Resources Bookstore. If there are multiple such locations, the measurement can be performed at a representative location.

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. For satisfaction surveys, the thermal satisfaction scale shall end with choices: To reduce draft risk at temperatures below For the first, it is not correct to use the average clothing insulation value to determine the desired thermal conditions for all occupants.

The measurement locations should be where the occupants are expected to spend time in. In order to achieve conditionns results, the standard also suggests the minimum equipment accuracy based the current industry standard. Thermal comfort is the condition of mind that expresses satisfaction with the thermal environment and is assessed by subjective evaluation.

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. Indoor thermal comfort can be determined from the responses of the occupant survey. 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 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.


Standard 55 – Thermal Environmental Conditions for Human Occupancy

The graph is valid for prevailing mean temperatures between 10— In general, body motion decreases the clothing insulation by pumping air through clothing. The survey shall be distributed to the entire occupancy or representative part of the occupancy. The last major change concerns measuring air speed and air temperature experienced by the occupant, which now must be an average standadr three heights and over a period of time.

The second method is to add or subtract individual garment clo value to achieve the clothing ensemble in question. Except sedentary activities, metabolic rate for all other activities is likely to have range of variation.

Standard 55 – Thermal Environmental Conditions for Human Occupancy

The answers of open-ended questions from “very dissatisfied” occupants should be documented for later analysis. For occupant-controlled naturally conditioned spaces, the measured results shall be check with the comfort zone established by adaptive model.

For thermal comfort—this is the standard. As for point-in-time surveys, the survey should be solicited during the time of occupancy, and the satisfaction scale ought to be continuous. This is the energy produced from a unit skin surface area of an average person seated at rest.

One can also take into account the posture of the occupants. When the duration of an activity is equal or less than one hour, one can use a time-weighted metabolic rate. To evaluate the probability of satisfaction fir satisfaction surveys, the standard suggests dividing the number of the votes falling between “just satisfied” and “very satisfied” by the total number of votes in that questions.