CBE Thermal Comfort Tool for ASHRAE-55

Time 2021-11-14 10:14:14

Web Name: CBE Thermal Comfort Tool for ASHRAE-55

WebSite: http://comfort.cbe.berkeley.edu

ID:232069

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Comfort,Thermal,CBE,Tool,ASHRAE,for,

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CBE Thermal Comfort Tool ASHRAE-55 EN-16798 Compare Ranges Upload Fans heatwaves PHS Help Other CBE tools Inputs Select method: PMV method Adaptive method Air temperature C Use operative temp Mean radiant temperature C Air speed m/s No local control With local control Relative humidity % Relative humidity Humidity ratio Dew point Wet bulb Vapor pressure Metabolic rate met Clothing level clo Create custom ensemble
Set clo value Dynamic predictive clothing Outdoor air temperature (6 am) C Set clo Solar gain on occupants Prevailing mean outdoor temperature C Air speed 0.3 m/s (59 fpm) 0.6 m/s (118 fpm) 0.9 m/s (177 fpm) 1.2 m/s (236 fpm) Set pressure SI/IP Local discomfort Globe temp Reset Save Reload Share Documentation Psychrometric (air temperature) Psychrometric (operative temperature) Relative humidity vs. air temperature Air speed vs. operative temperature Thermal heat losses vs. air temperature SET outputs chart Adaptive chart

NOTE: In this psychrometric chart the abscissa is the dry-bulb temperature, and the mean radiant temperature (MRT) is fixed, controlled by the inputbox. Each point on the chart has the same MRT, which defines the comfort zone boundary. In this way you can see how changes in MRT affect thermal comfort. You can also still use the operative temperature button, yet each point will have the same MRT.

Limits of Applicability: This standard is only applicable to healthy individuals. This standard does not apply to occupants: a) whose clothing insulation exceed 1.5 clo; b) whose clothing is highly impermeable; or c) who are sleeping, reclining in contact with bedding, or able to adjust blankets or bedding.

The CBE comfort tools automatically calculates the relative air speed and the dynamic clothing insulation .

NOTE: In this psychrometric chart the abscissa is the operative temperature and for each point dry-bulb temperature equals mean radiant temperature (DBT = MRT). The comfort zone represents the combination of conditions with the same DBT and MRT for which the PMV is between -0.5 and +0.5, according to the standard.

Limits of Applicability: This standard is only applicable to healthy individuals. This standard does not apply to occupants: a) whose clothing insulation exceed 1.5 clo; b) whose clothing is highly impermeable; or c) who are sleeping, reclining in contact with bedding, or able to adjust blankets or bedding.

The CBE comfort tools automatically calculates the relative air speed and the dynamic clothing insulation .

NOTE: This chart represents only two variables, dry-bulb temperature and relative humidity. The PMV calculations are still based on all the psychrometric variables, but the visualization becomes easier to understand.

The CBE comfort tools automatically calculates the relative air speed and the dynamic clothing insulation .

NOTE: This chart represents only two variables, air speed against operative temperature. The operative temperature for each point is determined by dry-bulb temperature equals mean radiant temperature (DBT = MRT). The calculation of PMV comfort zone is based on all the psychrometric variables, with PMV values between -0.5 and +0.5 according to the standard.

Limits of Applicability: The elevated air speed comfort zone method is to all spaces where the occupants have activity levels between 1.0 and 2.0 met and clothing insulation between 0.0 and 1.5 clo. There is no upper limit to air speed if occupant's total clothing > 0.7 clo and metabolic rate > 1.3 met.

The CBE comfort tools automatically calculates the relative air speed and the dynamic clothing insulation .

NOTE: This chart shows how some variables, calculated using the SET model, vary as a function of the input parameters you selected. You can toggle on and off the lines by clicking on the relative variable in the legend.

NOTE: This chart shows how the heat loss components, calculated using the PMV model, vary as a function of the input parameters you selected. You can toggle on and off the lines by clicking on the relative variable in the legend.

NOTE: Method is applicable only for occupant-controlled naturally conditioned spaces that meet all of the following criteria: (a) There is no mechanical cooling system installed. No heating system is in operation; (b) Metabolic rates ranging from 1.0 to 1.3 met; and (c) Occupants are free to adapt their clothing to the indoor and/or outdoor thermal conditions within a range at least as wide as 0.5-1.0 clo.

Please cite us if you use this software: Tartarini, F., Schiavon, S., Cheung, T., Hoyt, T., 2020. CBE Thermal Comfort Tool : online tool for thermal comfort calculations and visualizations. SoftwareX 12, 100563. https://doi.org/10.1016/j.softx.2020.100563

We have also released pythermalcomfort a Python packaged to calculate several thermal comfort indices (e.g. PMV, PPD, SET, adaptive). Links to the: official documentation and our paper.

Version: 2.3.1

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