29 research outputs found
Energy performance characterisation of vented opaque envelope through simplified methodologies
Opaque vented façades are innovative and widely-used
technological systems adopted both in new constructions
and in building renovations. According to European
Directive 2010/31/EU (EPBD recast) on the energy
performance of buildings, each Member State should give
priority to passive cooling techniques in order to enhance
building performance during the summer period. For this
purpose opaque vented envelope could be an appropriate
technological solution to reduce the summer peak loads
and the energy consumption. Although the EPBD recast
has submitted the development of calculation methods
for the energy performance evaluation to the European
Committee of Standardisation (CEN), there is a lack in
European Standards on the calculation of non conventional
building envelope performance, including
vented façades.
The object of the present work is the thermal
performance characterization of vented vertical opaque
enclosures in real conditions of use, through simplified
parameters.
Starting from EN ISO 6946 and EN ISO 13786, new
equivalent thermal parameters are defined, such as the
equivalent steady state thermal transmittance, the
equivalent periodical thermal transmittance and the time
shift.
Equivalent parameters are obtained by evaluating surface
inside face conduction in the opaque components, under
stabilized periodic external conditions, for the summer
design day. An equivalent outside temperature is used,
which considers both the convective and the radiative
thermal exchanges (solar and infrared waves), for
different boundary conditions (orientation). The tool
used for calculations is based on the conduction transfer
function – CTF – method, as implemented in the thermal
dynamic simulation program Energy Plus.
Through a sensitivity analysis, different opaque
enclosures are analyzed, varying the design parameters
such as the thickness, the height and the length of the
vented cavity
Un confronto tra prodotti isolanti sulla base di indicatori energetico ambientali
Una ricerca applicata all'analisi di materiali da costruzione ottenuti da "Materia Prima Secondaria" permette il confronto tra prodotti isolanti sulla base di indicatori energetico ambiental
Parametric Analysis of Energy Behaviour of Sunspaces Adjacent to Conditioned Spaces Through Dynamic Simulation
The purpose of this paper is to compare a steady-state method for the calculation of solar heat gain entering a conditioned space through a sunspace according to EN ISO 13790, with results of dynamic simulation, through EnergyPlus program, in
order to better consider features like thermal properties of glazed envelope varying
with solar position, thermal properties of opaque envelope such as absorption and reflection coefficients, the inertia of opaque envelope etc. and their effects on the sunspace energy performance, both in winter and summer conditions. In order to
determine which parameters of the model have the strongest effect on the results, sensitivity analyses are carried out for an attached sunspace. Latitude, geometrical characteristics of the sunspaces, thermal characteristics of the transparent and opaque envelope have been chosen as the parameters of the sensitivity analyses
Un confronto tra prodotti isolanti sulla base di indicatori energetico ambientali
Una ricerca applicata all’analisi di materiali da costruzione ottenuti da “Materia Prima Secondaria” permette il confronto tra prodotti isolanti sulla base di indicatori energetico ambientali
Il progetto e la verifica di un edificio a energia quasi zero: analisi critica delle prestazioni per un caso di studio
29° Convegno AICARR Bologna 201