Energy simulations for the estimation of building energy demand are in almost all cases carried out for each site with a TRY (i.e. Test Reference Year), based on data collected at airports, thus out of urban areas. Nevertheless, within urban areas, climatic and more generally environmental conditions – the aspect mostly studied, though not the only one, is the Urban Heat Island – are different from the ones in non urban zones, thus using the data collected at airports may introduce sometimes relevant errors in the final result of the energy demand estimation. Nonetheless, climate data collected within urban areas are rarely available over a long period of time necessary for building historical series (the World Meteorological Organisation recommends 30 years). In this paper the case of Milan is studied and a simplified method is proposed for estimating the intensity of the Urban Heat Island, namely the increase in urban temperatures, which is an unsteady phenomenon, over one year. The proposed method is based on the modification of weather data file (in this case the IWEC for Milano Linate airport) with corrections linked to circulation types. Thus the energy demand for an office building type in Milano is investigated, carrying out simulations both with corrected climatic data and with the ones from airport measurements, results are then analysed and discussed.
Simplified method for modification of weather data file for energy simulations within urban areas
TOPPI, TOMMASO;ZANGHERI, PAOLO;PAOLINI, RICCARDO
2009-01-01
Abstract
Energy simulations for the estimation of building energy demand are in almost all cases carried out for each site with a TRY (i.e. Test Reference Year), based on data collected at airports, thus out of urban areas. Nevertheless, within urban areas, climatic and more generally environmental conditions – the aspect mostly studied, though not the only one, is the Urban Heat Island – are different from the ones in non urban zones, thus using the data collected at airports may introduce sometimes relevant errors in the final result of the energy demand estimation. Nonetheless, climate data collected within urban areas are rarely available over a long period of time necessary for building historical series (the World Meteorological Organisation recommends 30 years). In this paper the case of Milan is studied and a simplified method is proposed for estimating the intensity of the Urban Heat Island, namely the increase in urban temperatures, which is an unsteady phenomenon, over one year. The proposed method is based on the modification of weather data file (in this case the IWEC for Milano Linate airport) with corrections linked to circulation types. Thus the energy demand for an office building type in Milano is investigated, carrying out simulations both with corrected climatic data and with the ones from airport measurements, results are then analysed and discussed.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
