ASHRAE 55-2007 PDF

ANSI/ASHRAE Standard (Supersedes ANSI/ASHRAE Standard ) ASHRAE STANDARD Thermal Environmental Conditions. CBE Thermal Comfort tool to calculate thermal comfort according to ASHRAE Standard , ASHRAE standard 55 thermal comfort tool, thermal comfort. See Appendix I for approval dates by the ASHRAE Standards Committee, the ASHRAE an ASHRAE Standard may be purchased from the ASHRAE Web site .

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Also, this standard should not be used with clothing that is highly impermeable to moisture transport e. If there are multiple such locations, the measurement can be performed at a representative location.

Ashfae application of this 55-20007 must specify the space to which it applies or the locations within that space to which it applies, if not to the entire space. The graph is valid for prevailing mean temperatures between 10— The computer code in Appendix D is to be used with this standard. The method and design conditions, including the design exceedance level, appropriate for the intended use of the building shall be selected and should be documented in accordance with Section 6.

Thermal comfort during continuous and intermittent work.

The requirements in this section are based on sensitivity to draft in the head region with airflow from behind and may be conservative for some locations on the body and for some directions of airflow. Clothing insulation is the resistance to sensible heat ashraae provided by a clothing ensemble expressed in units of clo, which is a unit to quantify the insulation provided by garments and clothing ensembles.

Thermal comfort – compliance

Elevated air speed may be used to offset an increase in the air temperature and the mean radiant temperature, but not by more than 3. The effect is greater with higher metabolic rates. K Light Activity Standing 6. All of the spaces except fo When the occupant is located in a directed airflow, the air temperature on the upstream side shall be used.

For near sedentary activities where the metabolic rate is approximately 1. Some of the sections below may not be applicable to naturally conditioned buildings.

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Therefore, the elevated air speed must be under the direct control of the affected occupants and asgrae in steps no greater than 0. See Appendix A for estimation of metabolic rates and Appendix B for estimation of clothing insulation.

Standard 55 – Thermal Environmental Conditions for Human Occupancy

Consensus requires that all awhrae and objections be considered, and that an effort be made ashrar their 55-22007. Thermal stratification that results in the air temperature at the head level being warmer than at the ankle level may cause thermal discomfort. The standard is intended for use in design, commissioning, and testing of buildings and other occupied spaces and their HVAC systems and for the evaluation of thermal environments.

The overall space supplied by the system should be shown in a plan view layout, with all individual zones within it identified. For metabolic rates less than or equal to 1. 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. No heating system is in asheae b Metabolic rates ranging from 1.

For many chairs, the net effect of sitting is a minimal change in clothing insulation. In the first form, different individuals wear different clothing due to factors unrelated to the thermal conditions.

The first form of variability may result in differences in the requirements for thermal comfort between the different occupants, and these differences should be addressed in applying this standard.

Verify satisfactory air speed with a group of readings taken at a strategic location within the space. For determining compliance with the non-steady-state requirements of Section 5, the rate of change of operative temperature is 55-2007. Dougherty Hakim Elmahdy Matt R.

For the purposes of Section 5, the thermal environment is defined with respect to the occupant. The electronic format facilitates both paper-based and computer-based processing. Through its Handbook, appropriate chapters will contain up-to-date standards and design considerations as the material is systematically revised. Aviation, Space and Environmental Medicine Comfort limits for heated ahrae. Retrieved from ” https: Thus, it only provides an approximation of the clothing insulation value of a moving person.

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The activity and clothing of the occupants must be considered in applying this standard. Where the variability within a group of occupants is of the second form and is a result only of individuals freely making adjustments in clothing to suit their individual thermal preferences, it is acceptable to use a single representative average clothing insulation value for everyone in that group.

In general, people are more sensitive to asymmetric radiation caused by a warm ceiling than that caused by hot and cold vertical surfaces. This asymmetry may cause local discomfort and reduce the thermal acceptability of the space.

Standard 55 – Thermal Environmental Conditions for Human Occupancy

However, this standard allows elevated air speed to be used to increase the maximum temperature for acceptability if the affected occupants are able to control the air speed. It is not yet known the extent to which people may modify their metabolic rate to decrease warm discomfort. It was first published inand since has been updated every three to six years.

Metabolic rate is the rate of transformation of chemical energy into heat and mechanical work by metabolic activities of an individual. 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. Under all expected operating conditions, air speed nondirectionalair temperature, and humidity shall be verified.

First, one can estimate the clothing insulation from the table provided in section five. It has not been processed according to the ANSI requirements for a standard and may contain material that has not been subject to public review or a consensus process. The second method is to add or subtract individual garment clo value to achieve the clothing ensemble in question.

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