L'errore di misura nelle apparecchiature a camera calda

The error analysis shows that in the measurements of the thermal transmittance of large components with a hot-box apparatus the more important error is in the evaluation of the heat flux through the specimen. Either in the guarded hot-box or in the calibrated hot-box the measurement is influenced by heat losses of very difficult determination. They are related either to the temperature difference between the metering and the guard chamber, or to the thermal bridge at the boundary zone of the measuring surface or the possible leakages at the same boundary zone. In this paper an initial analysis is carried out on the thermal behavior of the calibrated hot-box under construction at the Laboratorio di Termoenergetica of Bari.