Thermal storage with concrete slab of pressurized plenum in underfloor air distribution system

In calculating the heat flows around the floor plenum of underfloor air distribution system, the convective heat transfer coefficient is an influential factor, but it is not clearly known which value should be taken. The convective heat transfer coefficient was measured with the airflow velocity, and the relationship between them was clarified, involving the airflow and surface temperatures. Another set of measurements was made with a full-scale experimental rig of floor plenum, and the measurement result was analyzed with newly proposed "1-dimensional model" and "Developed 1- dimensional model", both of which were shown to predict well the heat flows and temperatures, using the above-mentioned convective heat transfer coefficient relationship.