The Energy Performance of Building Directive 2002/91/CE and Directive 2010/31/EU, requests the evaluation of the amount of energy to meet the different needs associated with a standardized use of building, such as heating, air conditioning, hot water heating, ventilation and lighting. In many buildings large amount of glazed area are used and the thermal properties of the glazed area are very important for the definitions of energy loads. Specifically the U-value and solar heat gain coefficient are needed to calculate the energy performance of buildings using dynamic computer simulations. In this paper we have focused on winter losses. In this field two different EN standards can help for the determination of the Uvalue: standard calculation considering conduction, convection and radiative heat transfer (EN 673) or measurement by means of a double hot plate (EN 674). This first method is the more diffuse and easy to apply, the second needs the preparation of two squared specimen at least 750x750 mm and the availability of an ad hoc apparatus. The aim of this paper is to present the results of an experimental and theoretical analysis of the more diffuse type of glazing systems: standard double pane systems, double pane with low-e, solar control and selective films, triple pane with low-e film, with and without gas filling. Percentage of argon filling the gap, emissivity of the glass surfaces are measured respectively by gas chromatography and UV-VIS-NIR spectro-photometry. A comparison between U-values calculated and measurement is presented and discussed.
Thermal performances of glazing systems: experimental measurements (EN 674) versus calculation (EN 673)
RUGGERI, PAOLO;PERON, FABIO;ROMAGNONI, PIERCARLO
2013-01-01
Abstract
The Energy Performance of Building Directive 2002/91/CE and Directive 2010/31/EU, requests the evaluation of the amount of energy to meet the different needs associated with a standardized use of building, such as heating, air conditioning, hot water heating, ventilation and lighting. In many buildings large amount of glazed area are used and the thermal properties of the glazed area are very important for the definitions of energy loads. Specifically the U-value and solar heat gain coefficient are needed to calculate the energy performance of buildings using dynamic computer simulations. In this paper we have focused on winter losses. In this field two different EN standards can help for the determination of the Uvalue: standard calculation considering conduction, convection and radiative heat transfer (EN 673) or measurement by means of a double hot plate (EN 674). This first method is the more diffuse and easy to apply, the second needs the preparation of two squared specimen at least 750x750 mm and the availability of an ad hoc apparatus. The aim of this paper is to present the results of an experimental and theoretical analysis of the more diffuse type of glazing systems: standard double pane systems, double pane with low-e, solar control and selective films, triple pane with low-e film, with and without gas filling. Percentage of argon filling the gap, emissivity of the glass surfaces are measured respectively by gas chromatography and UV-VIS-NIR spectro-photometry. A comparison between U-values calculated and measurement is presented and discussed.
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
