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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CBE Thermal Comfort Tool for ASHRAE

Thus, the curve in Figure 5. Except sedentary activities, metabolic rate for all other ashre is likely to have range of variation. It may be expressed in terms of several thermodynamic variables, including vapor pressure, dew-point temperature, and humidity ratio. Measuring Device Criteria The measuring instrumentation used shall meet the requirements for measuring range and accuracy given in ASHRAE Standard or or in ISO ,1 and the referenced source shall be so identified.

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

Standard 55 – Thermal Environmental Conditions for Human Occupancy

By using this site, you agree to the Awhrae of Use and Privacy Policy. This appendix is not part of this standard.

K Standing Relaxed 5.

Humidity, comfort and contact lenses. If occupancy distribution cannot be estimated, then the measurement locations shall be as follows: Use of the PMV model in this standard is limited to air speeds not greater 5-52007 0.

Those fluctuations under the direct control of the individual occupant do not have a negative impact on thermal comfort, and the requirements of this section do not apply to these fluctuations. For mechanically conditioned spaces, the PMV-based comfort zone has to be determined, which includes measuring and recording 5-2007 metabolic activity and clothing insulation.


Thermal Sensation Scale 1. It is not intended to be a measurement specification.

Standard 55 – Thermal Environmental Conditions for Human Occupancy

Large individual differences exist between people with regard to the preferred air speed. This signifies the concurrence of more than a simple majority, but not necessarily unanimity. In your account, you can control what you get updated on and how you receive your notifications.

In the case of exterior walls with windows, the measurement location shall be 1. Simulation of heat generated by occupants is recommended. 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.

Time averaging and spatial averaging are the same as for air temperature.

The average is with respect to location and time. Generally, the evaluation of comfort in existing buildings can be performed from two perspectives: This area may not be considered exempt; however The ASHRAE thermal sensation scale, which was developed for use in quantifying people’s thermal sensation, is defined as follows: Radiant asymmetry is the difference between the plane radiant temperature in opposite directions.

Assumed electrical load for lighting and equipment in occupied spaces including diversity considerations used in HVAC load calculations should be documented, along with any other significant thermal and moisture loads assumed in HVAC load calculations and any other assumptions upon which HVAC and control design is based.

Examples include different clothing style preferences for men and women and offices where managers are expected to wear suits while other staff members may work in shirtsleeves. People are more sensitive to local discomfort when the whole body is cooler than neutral and less sensitive to local discomfort when the whole body is warmer than neutral.

It is a single value for the entire body and may be considered a spatial average of the temperature of surfaces surrounding the occupant weighted by their view factors with respect to the occupant.


The plane radiant temperature is defined similarly to mean radiant temperature except that it is with respect to a small planar surface element exposed to the thermal radiation from surfaces from one side of that plane.

Turbulence intensity is measured in the same period by calculating the ratio of the standard deviation for the period to the average air speed. You can also still use the operative temperature button, yet each point will have the same MRT.

Thermal comfort – compliance

The survey shall be distributed to the entire occupancy or representative part of the occupancy. Individuals will adjust the bedding to suit individual preferences. Description of Thermal Environmental Variables The following description of the environmental variables is provided for the purpose of understanding their use in Section 5.

The methods are listed in order of accuracy and should be used in this order of preference. No local air speed control With local air speed control. The values of DR predicted from this equation must be within the limits specified for draft in Table 5.

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. This chart represents only two variables, air speed against operative temperature.

The following instructions apply to change proposals submitted in electronic form. Nonuniformity is addressed in Section 5. Determine the best location for providing accurate air temperature and humidity readings.

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