The dynamic (time-varying) behaviour of buoyancy-driven air movement and heat transfer has been examined for a thermally lightweight, low energy test cell subject to external climatic variations. Measurements include heat transfer from a sun patch induced by solar gain through a south-facing, glazed façade This data was analysed by two different methods; simple single-sample thermo-fluid experiments and time-series analysis techniques. These were in turn compared with computational fluid dynamics simulations and recent correlating equations. The results provide insights into the physics of buoyancy-driven convective flows within, and the thermal design requirements for, passive solar buildings.

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