INTRODUCTION There are many reasons to pursue clean energy alternatives in both new-built and renovated/upgraded buildings.The most obvious is,of course,the direct economic benefit of either reducing ongoing energy co...INTRODUCTION There are many reasons to pursue clean energy alternatives in both new-built and renovated/upgraded buildings.The most obvious is,of course,the direct economic benefit of either reducing ongoing energy costs by using fuel and electricity more efficiently,or by eliminating these costs entirely when incorporating renewable energy sources such as solar or wind power.展开更多
Boundary-layer wind tunnel provides a unique platform to reproduce urban, suburban and rural atmospheric boundary layer （ABL） by using roughness devices such as vortex generators, floor roughness, barrier wails, and...Boundary-layer wind tunnel provides a unique platform to reproduce urban, suburban and rural atmospheric boundary layer （ABL） by using roughness devices such as vortex generators, floor roughness, barrier wails, and slots in the extended test-section floor in the contraction cone. Each passive device impacts wind properties in a certain way. In this study, influence of various passive devices on wind properties has been investigated. Experi- ments using eighteen different configurations of the passive devices have been carried out to simulate urban, sub-urban, and rural climate conditions in a boundary-layer wind tunnel. The effect of each configuration on the wind characteristics is presented. It was found that higher barrier height and more number of roughness elements on the floor, generated higher turbulence and therefore higher model scale factors were obtained. However, in- creased slot width in the extended test-section floor in the contraction cone of the wind tunnel seemed to have a little effect on wind characteristics.展开更多
文摘INTRODUCTION There are many reasons to pursue clean energy alternatives in both new-built and renovated/upgraded buildings.The most obvious is,of course,the direct economic benefit of either reducing ongoing energy costs by using fuel and electricity more efficiently,or by eliminating these costs entirely when incorporating renewable energy sources such as solar or wind power.
文摘Boundary-layer wind tunnel provides a unique platform to reproduce urban, suburban and rural atmospheric boundary layer （ABL） by using roughness devices such as vortex generators, floor roughness, barrier wails, and slots in the extended test-section floor in the contraction cone. Each passive device impacts wind properties in a certain way. In this study, influence of various passive devices on wind properties has been investigated. Experi- ments using eighteen different configurations of the passive devices have been carried out to simulate urban, sub-urban, and rural climate conditions in a boundary-layer wind tunnel. The effect of each configuration on the wind characteristics is presented. It was found that higher barrier height and more number of roughness elements on the floor, generated higher turbulence and therefore higher model scale factors were obtained. However, in- creased slot width in the extended test-section floor in the contraction cone of the wind tunnel seemed to have a little effect on wind characteristics.
