| Autor: |
Pearce, Jonathan, Bevilacqua, Laura, Underwood, Robin, Bell, Stephanie |
| Předmět: |
|
| Zdroj: |
AIP Conference Proceedings; 2024, Vol. 3230 Issue 1, p1-7, 7p |
| Abstrakt: |
It is well known that temperature sensors used for meteorological and other applications are subject to errors from ambient thermal radiation influences such as direct sunlight and clear night skies and need to be screened accordingly. To simulate a realistic thermal and atmospheric environment for assessing the thermal performance of meteorological temperature sensors and to guide their optimization, a three-dimensional steady-state model of a meteorological instrument shelter was set up using COMSOL Multiphysics® 6.0. The model geometry is based on a widely used 'Stevenson screen' design with double louvers, and it is a replica of an actual screen at NPL employed to enable experimental validation of the model. Conductive and convective heat transfer within and between solids and liquids, turbulent fluid flow, and surface-to-surface radiation between almost all surfaces is modeled. All physics interfaces were coupled between each other. The purpose of the model is to provide information on typical temperature distributions and airflow patterns within the screen, which can be used for more rigorous modeling of methods for overcoming the radiation-induced temperature measurement errors commonly reported in this type of measurement. A preliminary validation of the model has been performed by comparison with temperature measurements throughout the real screen (inside and out) and in the ground. The exterior wind speed and direction, as well as the incident solar irradiation, have also been measured, to match the ambient modeled and measured conditions. Ultimately, the validated model will be used to assess various strategies for overcoming radiative temperature measurement errors inside meteorological screens. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
