Download Buoyancy Effects on Natural Ventilation by Torwong Chenvidyakarn PDF

By Torwong Chenvidyakarn

This publication describes intensive the basic results of buoyancy, a key strength in riding air and transporting warmth and pollution round the inside of a construction. This ebook is vital analyzing for a person considering the layout and operation of recent sustainable, energy-efficient structures, even if a scholar, researcher, or practitioner. The booklet provides new ideas in traditional air flow layout and addresses fantastic, little-known ordinary air flow phenomena which are seldom taught in structure or engineering faculties. regardless of its clinical and utilized arithmetic topic, the ebook is written in easy language and includes no tough arithmetic, whereas nonetheless masking either qualitative and quantitative points of air flow circulate research. it really is, consequently, appropriate to either non-expert readers who simply are looking to increase instinct of traditional air flow layout and keep an eye on (e.g., architects and scholars) and to these owning extra services whose paintings consists of quantifying flows (e.g., engineers and development scientists)

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2a). As the ventilation proceeds, the mixing causes the mean temperature T in the interior, and hence the reduced gravity gʹ, to decrease towards those of the exterior air (Figs. 2a, b). 1-i) where the expression for Q may be obtained from tracing pressure along the streamline and applying Bernoulli’s theorem. 1-ii) where the term (gʹhW )1/2 describes the speed of the exchange flow. The effective opening area A* is given according to Eq. 4-i) as A* = ca, with c being the pressure loss coefficient and a the visible opening area.

2-i) 0 where g is gravitational acceleration, ρ is the density of air and z is the vertical distance (upward positive). The system is in equilibrium when the density and pressure are constant across the horizontal. This leads to stable stratification when heavier, colder air lies underneath lighter, warmer air; and to instability (technically called Rayleigh–Taylor instability) when heavier, colder air lies atop warmer, lighter air. In the latter circumstance, displacements of density occur across the horizontal to restore the stability, leading to convective motions.

4. Effective opening area In applying Eq. 3-iii) the natural contraction and expansion of the fluid (Fig. 3) as it enters and leaves an opening need to be taken into consideration. This contraction and expansion interrupts the smooth flow of the fluid, causing a loss in flow pressure. The sharper the edges of the opening are, the more abruptly the flow contracts and expands, and the more pressure is lost. Furthermore, a flow through a window or a doorway often encounters additional restrictions such as louvres, security bars and insect screens.

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