ANSI/ASHRAE Standard , Thermal Environmental Conditions for Human Occupancy. • Addendum p: Aligns Section with the definition of average. ANSI/ASHRAE Standard (Supersedes ANSI/ASHRAE Standard ). Includes ANSI/ASHRAE addenda listed in Appendix |. o) ASHRAE. Standard — Thermal Environmental Conditions for Human Occupancy( ANSI approved).

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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. 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.

The second method is to add or subtract azhrae garment clo value to achieve the clothing ensemble in question.

Home Technical Resources Bookstore. Please first log in with a verified email before subscribing to alerts. Retrieved from ” https: The comfort zone boundaries must be adjusted to the air movements, and the zone conditions should be adjusted to avoid local thermal discomfort.

So far, all the clothing insulation value can be used when asjrae occupant is standing. It is also specified that the methods provided by this standard are no longer valid when the clothing insulation exceed 1.

If that number is between 20 and 45, the minimum number of responses is For satisfaction surveys, the thermal satisfaction scale shall end with choices: Metabolic rate is the ashrze of transformation of chemical energy into heat and mechanical work by metabolic activities of an individual. 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.

Standards Subsctiption may be the perfect solution. 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 55-200.


The measurement locations should be where the occupants are expected to spend time in. 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 After the body of the standard there are 11 informative appendices.

Retrieved 24 November As for point-in-time surveys, the survey should be solicited during the time of occupancy, and the satisfaction scale ought to be continuous. In the standard underwent significant changes with the addition of two thermal comfort models: 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 such spaces, the indoor and outdoor air temperature and mean radiant temperature and the air speed need to be measured. 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. The function line has four segments: 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 occupant is moving, it also affects the insulation value of clothing. Accurate data from the measurement using thermal manikins is acceptable. Both of these sections are clarified and streamlined for use by owners and third-party rating systems.

The survey shall be distributed to the entire occupancy or representative part of the occupancy. The graph is valid for prevailing mean temperatures between 10— Standards Subscriptions from ANSI provides a money-saving, multi-user solution for accessing standards.

Standard 55 – Thermal Environmental Conditions for Human Occupancy

The answers of open-ended questions from “very dissatisfied” occupants should be documented for later analysis. It was revised in55-20110,and There is a function to determine the representative clothing insulation at each segment. Documentation requirements to show that a design complies with Standard 55 are contained in Section 6, and a sample compliance form is provided in Appendix K.


Indoor thermal comfort can be determined from the responses of the occupant survey. There is a variety of 55-2010 to determine the insulation provided by clothing. Looking for previous revisions of this standard?

There are two cases when evaluating thermal comfort: A occupant-controlled naturally conditioned space is where the thermal conditions of the space are primarily regulated by occupant-controlled openings. This is the energy produced from a unit skin surface area of an average person seated at rest.

ANSI/ASHRAE Standard – Thermal Environmental Conditions for Human Occupancy

First, one can estimate the clothing insulation from the table provided in section five. Proceed to Checkout Continue Shopping. If the document is revised or amended, you will be notified by email. The standard addresses the four primary environmental factors temperaturethermal radiationhumidityand air speed and two personal factors activity and clothing that affect thermal comfort.

Standard 55 – Thermal Environmental Conditions for Human Occupancy

For seating occupants, the air temperature and air speed measurements shall be taken at heights of 0. These values are valid for an average adult with surface skin area of 1. Views Read Edit View history. Requirements are now clearly stated and calculation procedures appear sequentially.

And this equation is only valid when the metabolic rate is between 1. As described within the standard: To reduce draft risk at temperatures below The third method is to add all the clo value of ashhrae garment to match the clothing ensemble in question.