Reducing Roof Solar Heat Gain by Using Double-Skin Ventilated Roofs

Heat transfers in a double-skin roof ventilated by natural convection in summer time

The double-skin roofs investigated in this paper are formed by adding a metallic screen on an existing sheet metal roof. The system enhances passive cooling of dwellings and can help diminishing power costs for air conditioning in summer or in tropical and arid countries. In this work, radiation, convection and conduction heat transfers are investigated. Depending on its surface properties, the...

How Double Skin Façade’s Air-Gap Sizes Effect on Lowering Solar Heat Gain in Tropical Climate?

The most pleasant architectures are known as systems which are able to maintain great correlation with nature. These systems make the best out of natural potentials to maintain thermal comfort for buildings occupants. To that aim, the first step is to manage the effect of outside weather condition on building’s envelope. DSF is known as architects’ solution to control incoming wind speed, manag...

Solar Energy Collection using a Double-layer Roof

The purpose of this study is to investigate the efficiency of a double-layer roof in collecting solar energy as an application to the areas such as raising high-end temperature of organic Rankine cycle (ORC). The by-product of the solar roof is to reduce building air-conditioning loads. The experimental apparatus are arranged to evaluate the effects of the solar roof in absorbing solar energy. ...

Reducing Solar Heat Gain during Winter: The Role of White Bark in Northern Deciduous Trees

Deciduous tree species throughout the boreal forest of North America have lighter-coloured bark than do species restricted to more southern forests. We tested the hypothesis that light-coloured bark minimizes the thawing and freezing of cambium tissue during winter that could contribute to sunscald injury. During mid-winter, maximum midday cambium temperatures of south-exposed bark of white bir...

Efficient Roof Shapes through Wind Flow and Indoor Temperature, Case Studies: Flat Roofs and Domed Roofs