Numerous experiments on individual buildings in California and Florida show that painting roofs white reduces air conditioning load up to 50%, depending on the thermal resistance or amount of insulation under the roof. The savings, of course, are strong functions of the thermal integrity of a building and climate. In earlier work, we have estimated the national energy savings potential from ref...

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...

This paper presents an overview of observed distresses on low slope roofing systems collected for the Building Envelope Life Cycle Asset Management (BELCAM) project. The data include over 14,000 visible distresses from 600 roofs from seven different climatic regions across Canada. The distresses encountered for built up roofs, modified bituminous roofs and a limited number of single-ply roofing...

The design of thermal insulation in roofs is very important to reduce energy consumption and decrease the environmental impacts buildings. An integrated economic assessment-based optimization method presented this paper find best candidate scheme for building roofs, including determination roof type optimum thickness. In method, a zonal method-based double-skin ventilation heat transfer model d...

Many of China’s older buildings, built in the 1970s and 1980s, faces several indoor temperature heating energy consumption problems. Based on an investigation analysis old hotel Urumqi, this paper proposes a renovation plan to improve reduce consumption, thereby introduce sustainable development strategy for winter. The effects different plans were simulated using DesignBuilder PVsyst software....

In this study, optimum insulation thicknesses are calculated for three different flat-surfaces which navigable terrace roof; stone-covered and soil-covered un-navigable flat roof types. The outdoor temperature, the value of January, is coldest month in winter, July, hottest summer, solar radiation, considered together. Flat surfaces to be black painted marble. Firstly, solar-air temperatures we...