Convegni ATI - Accesso riservato soci CTI

Autore: A. Gasparella, G. Pernigotto

Collana: CA - 66 - Rende 2011

Note:
In this work the influence of the use of the air setpoint temperature instead of the operative temperature in determining the losses has been assessed with the simulation code TRNSYS. A large number of cases has been developed basing on a factorial plan aimed to investigate the main variables related to the envelope of the building and its behavior: for example, variations in geometry (shape of the floor and dimensions of the glazings), wall insulation level, climatic conditions and the number of zones – a single zone or two equivalent coupled zones, have been considered.
The setpoint strategy significantly affects the deviations between the simulated thermal losses and the EN ISO 13790 ones, with percentage deviations greater than 5% when an air temperature setpoint is used. In this context, considering a not insulated envelope, the percentage differences can grow to 20%. When an operative temperature setpoint is employed, both for insulated and not insulated walls, the deviations decrease under the 5%.