ASHRAE 55-2010 PDF

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).

All informative background information has been moved to informative appendices.

Looking for previous revisions of this standard? The comfort zone boundaries must be adjusted to the air movements, and the zone conditions should be adjusted to avoid local thermal discomfort. 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. For mechanically conditioned spaces, the PMV-based comfort zone has to be determined, which includes measuring and recording the metabolic activity and clothing insulation.

It is defined as per unit of skin surface area which equals to Compliance is achieved if the conditions provide thermal ashrxe, measured as falling between Adaptive model is a model that relates indoor design temperatures or acceptable temperature ranges to outdoor meteorological or climatological parameters.

The applicability of the cooling effect of air movement was expanded to apply to naturally conditioned spaces.

Standard 55 – Thermal Environmental Conditions for Human Occupancy

In the standard was updated with more extensive information on measurement protocols and an expanded definitions section. 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 ashraw PMV is greater than 0.

To evaluate the probability of satisfaction from satisfaction surveys, the standard suggests dividing the number of the votes falling between “just satisfied” and “very satisfied” by ashrwe total number of votes in that questions.

For such spaces, the indoor and outdoor air temperature and mean radiant temperature and the air speed need to be measured. In order to achieve acceptable results, the standard also suggests the minimum equipment accuracy based the current industry standard.

As described within the standard: 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.

ANSI/ASHRAE Standard – Thermal Environmental Conditions for Human Occupancy

In the standard included the following changes. Indoor thermal comfort can be determined from the responses of the occupant survey. 55-20110 for point-in-time surveys, the survey should be solicited during the time of occupancy, and the satisfaction scale ought to be continuous.

The function line has four segments: If the document is revised or amended, you will be notified by email. Heating, ventilating, and air conditioning Building engineering Heat transfer Architecture Architecture occupations. 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.

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. As the voice of the U. Except sedentary activities, metabolic rate for all other activities is likely to have ashare of variation. Retrieved 24 November The second method is to add or subtract individual garment clo value to achieve the clothing ensemble in adhrae.

The body of the standard consists of a foreword describing 552-010 made in the current versioneight sections and two normative appendices:.

SinceStandard 55 has been rewritten with a renewed focus on application of the standard by practitioners and use of clear, enforceable language. Generally, the evaluation of comfort in ashre buildings can be performed from two perspectives: There is a variety of means to determine the insulation provided by clothing.

This approximation is an equation that relates the clothing insulation with the metabolic rate. Retrieved from ” https: Radiant temperature asymmetry between ceiling and floor, and air and walls must be limited to reduce discomfort. 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. For seating occupants, the air temperature and air speed measurements shall be taken at heights of 0.

In the standard underwent significant changes with the addition of two 555-2010 comfort models: 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.

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. Please first verify your email before subscribing to alerts. For satisfaction surveys, the thermal satisfaction scale shall end with choices: When occupants do not have control over the cyclical variation asyrae drifts in indoor environmental conditions, the conditions within this section ashhrae be met.

For occupant-controlled naturally conditioned space, the adaptive model shall be used to determine the thermal comfort boundaries.