Office of Energy Efficiency & Renewable EnergyForrestal Building1000 Independence Avenue, SWWashington, DC 20585. There are other options like using a reflective or high gloss white paint. Another option is General Formulations' printable silver polester film, The same material used to wrap automobiles with commercial messages without damaging the underlying paintwork is also offered with a reflective mirror finish. The reduced heat gain may even allow for a smaller air conditioning system. The reflective insulation trade association also offers installation tips. Heat transfer by convection occurs when a liquid or gas -- air, for example -- is heated, becomes less dense, and rises. Most growers would never suggest using aluminum foil to line the walls. Radiant barriers can be combined with many types of insulation materials in reflective insulation systems. Fuel Efficient & Alternative Fuel Vehicles, Insulation and Air Sealing Products and Services. As a huge source of energy loss in homes, the attic is a great place to start. Aluminum foil offers a low-cost reflective material that is readily available in most cities. Foils in general are easily bent or crinkled so bonding the foil … Standard kitchen aluminum foil can work well as a solar cooking reflective material. We are committed to saving you money by sealing your attic—which is the main source of air leaks in the home. One source for this material is Solar Cooker at CantinaWest: Silver Reflective Adhesive Vinyl, who report that the material has a reflectivity ratio of 86%. Any such link does not constitute an endorsement or any representation regarding, the linked website, its content, its owner, its performance, its owner’s products or services, or any forward-looking statements found in. Radiant barriers and reflective insulation systems work by reducing radiant heat gain. When installing a foil-type barrier, it's important to allow the material to "droop" between the attachment points to make at least a 1.0 inch (2.5 cm) air space between it and the bottom of the roof. The performance would suffer greatly compared to a truly reflective material, but this is worth more study. Polished metal surfaces have been tried, and while effective, tend to be costly solutions. Much of this heat travels by conduction through the roofing materials to the attic side of the roof. S-ReflecT sheets laminated with high reflection PET film, on which an aluminum layer is spread by vaporization under vacuum method. The radiant barrier should be installed in a manner to minimize dust accumulation on the reflective surface. Vinyl sheeting with a mirror like finish is available in rolls with a self-adhesive backing, which has an easily removed protective layer. If you are building a solar cooker and traditional reflective materials are not available in your area, several low-tech reflective material solutions can be used as alternatives. This type of insulation is designed to reduce radiant heat gain. Using a white color instead of reflective sheet. Even cost doesn’t have to be a factor since you can make them cheaply out of aluminum foil and cardboard that has been painted white. Reflective insulation, installed in the attic ceiling, helps reflect sunlight and reduce the radiant heat transfer from the underside of the roof to the other surfaces in the attic. Reflective tape can be used for the reflective material on various types of solar cookers. Our insulation team installs batt and blown-in fiberglass insulation. Subscribe to receive updates from Energy Saver, including new blogs, updated content, and seasonal energy saving tips for consumers and homeowners. Heat travels from a warm area to a cool area by a combination of conduction, convection, and radiation. For additional discussion, visit Topics needing research. Reflective insulation is a material with reflective facing—typical materials are foil-faced kraft paper, plastic film, polyethylene bubbles and cardboard. S-Reflect has a very high reflectence : 90% and a perfect thickness for using in every solar cooker design with or without a background. When it comes to choosing the reflective material, mylar seems to be the obvious pick. When the sun heats a roof, it’s primarily the sun’s radiant energy that makes the roof hot. Photo sent by Ranyere Bezerra. Most common thermal insulation materials (like fiberglass) work by slowing conductive heat flow, but reflective insulation works a little differently. This photo shows how to use a Direct TV antenna as a solar cooker using reflective tape applied in strips. It might be possible under ideal conditions to use a white material to reflect more light into a box cooker or as the panels of a panel cooker. For the most part, however, reflective mulch benefits outweigh the potential detriments. As the liquid or gas cools, it becomes denser and falls. Some products are fiber-reinforced to increase durability and ease of handling. Foil-faced plywood or oriented strand board sheathing is also available. 210 North 10th Street, Sacramento, CA 95811, Asphalt roofing (which more easily absorbs heat from the sun). Reflective materials are a key component of almost any solar cooker. Radiant barrier insulation consists of a reflective material (generally aluminum foil) and can be combined with other materials in reflective …