Simplyfication of Noshiro's Ventilation System

Abstract

Nearly one hundred years ago, in 1910, K. Noshiro invented abuoyancy-driven natural ventilation system which controlled the temperature of a malted rice “Koji” room to be almost constant. He installed two chimneys of different lengths at the top of the “Koji” room.
The shorter chimney supplies cooler air to the “Koji” room and the other, longer chimney pulls warmer air from the “Koji” room. The system kept the temperature of the “Koji” room constant so that a high quality of “Koji” could be produced.
Were-examined Noshiro's ventilation mechanism and propose a new buoyancy-driven natural ventilation system which consists of just one chimney. The top of the chimney is not flat, but slope and the angle is more or less 20 degrees.
The slope of the chimney creates a circulation of heat between the room and outside, that is, the taller side of the chimney pulls warmer air from the room and the shorter side supplies cooler air into the room.