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Inicio  /  Climate  /  Vol: 7 Par: 2 (2019)  /  Artículo
ARTÍCULO
TITULO

Outdoor Air Temperature Measurement: A Semi-Empirical Model to Characterize Shelter Performance

Jérémy Bernard    
Pascal Kéravec    
Benjamin Morille    
Erwan Bocher    
Marjorie Musy and Isabelle Calmet    

Resumen

Shelters used to protect air temperature sensors from solar radiation induce a measurement error. This work presents a semi-empirical model based on meteorological variables to evaluate this error. The model equation is based on the analytical solution of a simplified energy balance performed on a naturally ventilated shelter. Two main physical error causes are identified from this equation: one is due to the shelter response time and the other is due to its solar radiation sensitivity. A shelter intercomparison measurement campaign performed by the World Meteorological Organization (WMO) is used to perform a non-linear regression of the model coefficients. The regression coefficient values obtained for each shelter are found to be consistent with their expected physical behavior. They are then used to simply classify shelters according to their response time and radiation sensitivity characteristics. Finally, the ability of the model to estimate the temperature error within a given shelter is assessed and compared to the one of two existing models (proposed by Cheng and by Nakamura). For low-response-time shelters, our results reduce the root mean square error by about 15% (0.07 K) on average when compared with other compensation schemes.

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