Summary
Small laboratory models of a flared chimney and a straight one were heated from underneath by a coil mimicking collector input, with intake height and heating power varied. The flared design produced a stronger buoyant draught and roughly 6–15 times more available power, while a mesh screen over the outlet stopped ambient air from flowing back down and raised airflow speed by about 30%.
Description written by Solar Tower. The original abstract is available from the publisher via the link below.