Experimental determination of thermal characteristics of lightweight building element with dual ventilated cavities

Available time for building construction is getting shorter, therefore the number of buildings which are built with lightweight building elements (LBE) is increasing. LBEs are elements of greater dimensions with low specific weight and low thermal transmittance. Their characteristic is also low thermal stability. By upgrading LBE with dual ventilated cavities (DVC) with counter flow becomes standard LBE a thermally activated building construction with increased thermal resistance and thermal stability. It enables using of solar radiation and heat recuperation from used air. In this paper experimental analysis of transient heat transfer, solar efficiency and heat recuperation efficiency, measured on innovative thermally activated LBE with DVC will be presented. Measurements were performed on LBE with DVC with outer surface painted with spectrally non-selective and selective green paint.