See Heat Flux, Diffuse Surface (Surface-to-Surface Radiation Interface), Temperature, Initial Values, or External Radiation Source for examples of features of the Heat Transfer interface that have ambient variables available as inputs.
See Initial Values, Moisture Content, or Moisture Flux for examples of features of the Moisture Transport interface that have ambient variables available as inputs.
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When User defined (the default) is selected, the Temperature Tamb, the Absolute pressure pamb, the Relative humidity φamb, the Wind velocity vamb, the Precipitation rate P0,amb, the Clear sky noon beam normal irradiance Isn,amb, and the Clear sky noon diffuse horizontal irradiance Ish,amb should be specified directly.
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When either Meteorological data (ASHRAE 2013) or Meteorological data (ASHRAE 2017) is selected, the ambient variables are computed from monthly and hourly averaged measurements, made over several years at weather stations worldwide. See Processing of ASHRAE Data for more information. Further settings for the choice of the location, time, and ambient conditions are needed; and additional input fields are displayed underneath.
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When From list is selected, click on the Set Weather Station... button to open the Weather Station browser that allows you to select a Region, a Country, and a Station. The station details (World Meteorological Organization reference, location, and geographical coordinates) are displayed underneath.
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It is also possible to select a station From reference by entering the corresponding World Meteorological Organization reference, which is a 6-digit number.
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A single country may be available for more than one region selection if it has stations spread over different regions. For example, United States of America is available in the Country list when either North America, Eurasia, or Oceania is selected in the Region list.
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When a station is selected From list, its World Meteorological Organization (WMO) reference is displayed in the user interface. The WMO references can also be retrieved from maps offered by third parties like the one available as of this product release on http://ashrae-meteo.info/.
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See Ambient Data Interpolation for more information about the interpolation of data over months and hours.
See Processing of ASHRAE Data for more information about the data.
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A time unit suitable for simulations over a day or a year may be set in the Study Settings section of the Time Dependent node, by using for example h for hour, d for day, or a for a year. See Using Units in the COMSOL Multiphysics Reference Manual for more details.
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The conditions set for Temperature and Dew point temperature should be consistent in order to keep the temperature larger than the dew point temperature. However, all settings combinations are available, and the relative humidity is majored by 1 when necessary.
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The sum of the Clear sky noon beam normal irradiance and the Clear sky noon diffuse horizontal irradiance is available through the postprocessing variable ht.Is_amb, defined as the Ambient solar irradiance.
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