"heat recovery systems"

Buildings consume one-third of all energy and two-thirds of all electricity generated. Cool metal roofs can help reduce energy consumption by lowering cooling loads with their wide array of finishes, designs and colors.Cool metal roofs are energy-efficient. • The roof can have the greatest impact on the energy use of a building. On a typical summer afternoon, a light-colored, more reflective roof that reflects 80 percent of sunlight will stay about 310C (550F) cooler than a darker roof that reflects only 20 percent of sunlight, as reported by the Heat Island Group of the Lawrence Berkeley National Laboratory. • Cool metal roofs are an excellent option for commercial retrofit applications because they can be efficiently installed with above-sheathing ventilation, allowing heat to dissipate through the ridge vent in hot weather while acting as an insulating layer when it is cold. Metal roofs can result in as much as a 30 percent reduction in heat gain through the vented roof. • Metal roofs provide the optimal foundation for photovoltaic installations since the roof can be expected to last longer than the PV system it supports. • Wall and roof solar heat recovery systems can be integrated with steel cladding and used to provide air, water or process heating needs. • Cool metal roofing is available unpainted, with thermosetting coil-applied paint finishes, or with granular-coated surfaces. This family of roofing can achieve solar reflectance of over 70 percent, meeting the EPA Energy Star Roof Products Program performance criteria. • Emittance as high as 90 percent can be achieved for painted and granular-coated metal roofing. • Painted metal roofs retain 95 percent of their initial reflectance and emittance over time. They resist the growth of organic matter and shed dirt more readily than other materials. • Cool metal roofing can help to mitigate the Urban Heat Island Effect because of its high reflectance, which can reduce ambient air temperatures. Cool metal roofs are cost-effective. • Metal roofing has low life-cycle costs, making it the choice of many school, government, commercial, industrial and institutional building owners. • Due to its light weight per unit area, structural savings can be realized in a building when compared with heavier non-metal roofing alternatives. • For re-roofing projects, metal roofing can often be applied over the original roof, saving removal and disposal costs. • Metal roofing is fully recyclable when ultimately removed as part of building renovation or demolition, allowing it to credibly claim both recycled content and 100 percent recyclability by recognized definitions. The product’s recyclability also provides significant savings on construction removal and disposal costs.

Designers and builders have long recognized steel for its strength, durability and functionality. An important aspect of steel’s story is its high recycled content and end-of-life recovery rate. Both attributes are recognized by the U.S. Green Building Council’s (USGBC) green building rating system, Leadership in Energy and Environmental Design (LEED), but steel construction products can contribute to many other LEED credits as well, either directly or indirectly. USGBC’s latest version, LEEDv4, includes a completely revised and expanded Materials and Resources section, with new credits in the areas of life-cycle assessment (LCA), environmental product declarations (EPDs), and overall product transparency

MAPEI’s Mapeheat™ radiant floor-heating system adds an extra touch of luxury to a five-star lodge.

When the people of Canada’s capital region seek relief from city life, they often retreat to the serene, natural beauty found in Quebec’s Gatineau hills. Here, where temperatures can drop to -38°F (-39°C) and snow falls seven months out of the year, heated flooring is a practical luxury. To help recreate a Scandinavian-style getaway for the Groupe Nordik Lofts du Village project, specifiers chose one of MAPEI’s Mapeheat floor-heating systems.

Codes required fire wall separations between parking garages and businesses, markets, homes and other uses. Architects can replace entire walls with glass to open up buildings like never before. For example, SuperLite® II-XL in GPX® Architectural Series Framing by SAFTI FIRST® is a USA-made fire resistive transparent wall system that blocks radiant heat and meets the same stringent ASTM E-119/ UL 263/ NFPA 251 code requirements that any opaque fire rated wall must meet.

It’s a fact that buildings consume two thirds of all the electricity produced in North America and one third of all the energy produced in North America. While it is recognized that adding insulation under the roof surface can reduce cooling and heating costs, there is a diminishing return on the strategy of increasing insulation to conserve energy costs. This is where “cool roofing” can play a role in further reducing the energy consumed, and in minimizing the Heat Island effect created in the big urban cities. Cool roofing relies on sustainable, energy efficient, coated steel products, in a wide variety of finishes, colours, textures and roofing profiles. It conserves energy through its properties of reflectivity and emissivity

It’s a fact that buildings consume two thirds of all the electricity produced in North America and one third of all the energy produced in North America. While it is recognized that cooling and heating costs can be reduced by adding insulation under the roof surface, there is a diminishing return on the strategy of increasing insulation to conserve energy costs. This is where “cool roofing” can play a role in further reducing the energy consumed, and in minimizing the Heat Island effect created in the big urban cities. Cool roofing relies on the properties of reflectivity and emissivity of the roofing material. Reflectivity Reflectivity is the ability of the roof to reflect solar radiation back into the atmosphere. Its primary measure is solar reflectance - the proportion of the total solar radiation that is reflected back to the atmosphere. Any solar radiation that is not reflected is absorbed into the building envelope, requiring further energy to cool the building; or partially convected into the atmosphere increasing the ambient air temperature in the surrounding environment (Heat Island effect). The measure of reflectivity is the Solar Reflectance Index (SRI) which takes into account the properties of the material as well as the cooling effect of wind passing over the roof. The SRI for a low slope roof will be 0 for standard black (reflectance 0.05, emittance 0.90) and 100 for standard white (reflectance 0.80, emittance 0.90).

The new Orlando VA Medical Center needed glazing that would not only provide light and transparency, but fire and hurricane protection and improved energy performance. SuperLite® II-XL in GPX® Hurricane Framing from SAFTI FIRST® was installed in exterior fire-rated locations that were exposed to the elements. These assemblies were rigorously tested and certified for fire and radiant heat protection for up to two hours, large missile impact, air and water infiltration, and cyclic wind loading.

Global warming and climate change are two terms found increasingly in headlines around the world. Initiatives such as the Kyoto Protocol have brought these issues to the forefront and provide a framework and objectives for reducing greenhouse gases (GHG). GHG are heat trapping gases, such as water vapour, carbon dioxide, or methane that absorb the earth’s heat and hinder it from being released into space. As levels of GHG build up in the atmosphere, a greenhouse effect takes place that warms the earth’s atmosphere and makes global climate change inevitable. A?itudes on environmental issues are changing worldwide. Developed nations are commi?ing to reducing GHG emissions to 5.2% below the 1990 baseline by 2012. Notably, Canada has commi?ed to reducing its GHG emissions to 6% below 1990 levels, which corresponds to a gap of 29.1% of where the nation is and where it wants to be. An ambitious undertaking, considering that Canada’s GHG emissions have been steadily on the rise over the years and in 2004 was actually 26.6% higher than 1990 levels. On a positive note, in the last two years emissions have started to decline, but there remains a long way still to go. =e quest for a greener Canada continues and helping to lead the way to a greener Canada is the nation’s steel industry, which is making great strides in reducing GHG emissions, conserving energy, and lessening impacts on our air, water, and land.

Introduction Sheet steel roofing and siding (cladding) is available in a wide variety of profiles, colours and paint systems. The modern prepainted systems used on Canadian-made products will provide decades of beautiful performance before there are any visible signs of deterioration of the paint surface. However, an important component of the cladding system is the fastener used to attach it to the structure. This fastener is not simply a screw; it is part of the roof or wall assembly and should be expected to provide the same long-term performance. This performance is not simply the capacity to safely hold the cladding in place, but also to match the colour and durability of the paint system. The selection of the correct screw for the job is the first step in the creation of a cladding system that will provide long-term performance. The next step is the installation. Installing screws in sheet steel cladding is commonplace and can be done very efficiently. The tool manufacturers have developed a wide range of options for installing fasteners into any type of substrate. Selecting the most appropriate tool will help the installation process.

Introduction Prefinished sheet steel building products, such as wall and roof cladding, liner sheet, flashing, and associated items, have experienced an enviable growth record during the past twenty years or so. Coil coated prefinished sheet steel in a variety of colours and paint systems has greatly enhanced the appearance of thousands of industrial, commercial, institutional, recreational, residential and farm buildings, providing an economical, durable and attractive alternative to traditional materials. As with all materials, a little care and maintenance pays off handsomely in terms of longevity and repair costs. The recommendations which follow have been learned at first hand and represent the collective industry experience with thin-film paint systems applied to metallic coated sheet steel by the coil coating process. In this publication the term “thin-film paint system” refers to a modified silicone polyester or a fluorocarbon type having a coating thickness about 25µm. When the guidelines listed below have been observed, thin-film paint systems have been used successfully for all types of environments other than severe industrial atmospheres which require special consideration. The guidelines are not intended for barrier coatings, laminates, and new formulations which have different characteristics than the thin-film paint systems on which these guidelines are predicated. 

For BART's Doolittle Maintenance Facility at the new Oakland Airport connector, SAFTI FIRST® provided 60 minute, fire resistive wall openings in the exterior using SuperLite® II-XL 60 insulated with low-e glazing in GPX® Framing with a clear anodized finish. SAFTI FIRST® engineered a connection that allows the structural elements of the GPX® Architectural Series Framing System to support an integral sunshade system, instead of being hung in front of it. The Doolittle Bart Station is one of the first installations of the GPX® Architectural Series System with sunshade connections, which also include SLCC New Instruction and Administrative Building in Salt Lake City, UT.