Passive ventilation and heating by natural convection of the rooms in a three-storey building were studied numerically, and experimentally using a laboratory-scale model, whilst in a five-storey building they were studied using computer simulation. The objective was to use the natural convection created in a solar heated vertical duct to draw ambient air into the rooms during summer, to compensate for solar heating of the building, and to use the air heated in the duct to warm the building during winter. Measured air temperatures and velocities in the laboratory model were in reasonable agreement with computer simulations. Simulations of a full-size building, using a south-facing duct for heating and a duct on the north face for air inflow and distribution, indicated that the system was feasible, even at relatively low solar radiation levels. Special measures were required to achieve thermal comfort in the upper storey during summer, whilst a by-pass over the upper storey improved the temperature uniformity between the storeys during winter. 19 refs.
Primary author(s): Letan R;Dubovsky V;Ziskind G
Vol.38, No.2, February 2003, p.197-208