buildings, the dynamic transfer properties, such asthe thermal admittance and the decrement factor, canbe used. These parameters, firstly introduced in theSeventies by some British researchers, allow toquantify the response of the building fabric tosinusoidal temperature variations occurring on bothsides of the fabric. Their use has been recentlysuggested in some international Standards, such asthe EN ISO 13786:2007.However, little reference is made in the scientificliterature to a further dynamic transfer property, thesurface factor, that describes the response of theopaque components of a building to sinusoidalradiant heat fluxes occurring on their internal surface.The surface factor is worth being exploited, since theeffect of wall inertia on the radiant heat gains isrelevant in the study of the thermal behaviour of abuilding, especially in summer.In this paper, an operational formulation of thesurface factor is firstly provided starting from itsconceptual definition. Afterwards, based on all thepreviously mentioned dynamic transfer properties, acomprehensive procedure for the assessment of thecyclic temperature swings in an enclosed space isintroduced. Thanks to the use of the Fourier analysis,this procedure allows tackling any periodic drivingforce, and not only sinusoidal ones. The reliability ofthe procedure is validated against the test casesproposed in the Standards EN ISO 13791:2012 andEN ISO 13792:2012.Finally, the results shown in the paper allow torealize how large is the approximation introduced bycalculating the dynamic transfer properties only withthe first harmonic, i.e. based on sinusoidal drivingforces with a period P = 24 hours, as suggested bythe simplified approach proposed in the Standard ENISO 13792:2012.
The Admittance method for calculating the internal temperature swings in free running buildings
MARLETTA, Luigi;EVOLA, GIANPIERO;
2013-01-01
Abstract
buildings, the dynamic transfer properties, such asthe thermal admittance and the decrement factor, canbe used. These parameters, firstly introduced in theSeventies by some British researchers, allow toquantify the response of the building fabric tosinusoidal temperature variations occurring on bothsides of the fabric. Their use has been recentlysuggested in some international Standards, such asthe EN ISO 13786:2007.However, little reference is made in the scientificliterature to a further dynamic transfer property, thesurface factor, that describes the response of theopaque components of a building to sinusoidalradiant heat fluxes occurring on their internal surface.The surface factor is worth being exploited, since theeffect of wall inertia on the radiant heat gains isrelevant in the study of the thermal behaviour of abuilding, especially in summer.In this paper, an operational formulation of thesurface factor is firstly provided starting from itsconceptual definition. Afterwards, based on all thepreviously mentioned dynamic transfer properties, acomprehensive procedure for the assessment of thecyclic temperature swings in an enclosed space isintroduced. Thanks to the use of the Fourier analysis,this procedure allows tackling any periodic drivingforce, and not only sinusoidal ones. The reliability ofthe procedure is validated against the test casesproposed in the Standards EN ISO 13791:2012 andEN ISO 13792:2012.Finally, the results shown in the paper allow torealize how large is the approximation introduced bycalculating the dynamic transfer properties only withthe first harmonic, i.e. based on sinusoidal drivingforces with a period P = 24 hours, as suggested bythe simplified approach proposed in the Standard ENISO 13792:2012.File | Dimensione | Formato | |
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