![]() Air leaking into the home carries dust, dirt, pollen, allergens and a bunch of other stuff that may not be desirable (aka, “bad air”). This presents several issues for efficient comfort. So, when air leaks out (ex-filtration), new air must leak in (Infiltration) to make up for the loss. This lost air carries with it all of the energy it took to heat, cool, humidify, dehumidify, clean and purify it originally. Warmer air rises to the upper levels of the house and leaks out of cracks, gaps and seams in the ceiling and is lost to the outdoors. For purposes of efficient comfort, radiation refers to the solar heat of the sun.Ĭonvection occurs 24/7/365 in our homes. RADIATION: is heat flow from a higher temperature source to a lower temperature source within “line-of-sight” (aka, solar energy or infrared radiation). For the purposes of efficient comfort, conduction refers to insulation or R-value. For purposes of efficient comfort, convection refers to air leakage or infiltration/ex-filtration.ĬONDUCTION: is heat transferred through solid objects and surfaces in contact with each other (aka, building envelope assemblies such as walls, ceiling, floors and windows). Convection happens because of temperature and density differences in the air. The same thing happens to energy saving and comfort in homes when you fail to address each of convection, conduction and radiation.īefore we can solve any potential issues, it is crucial to define and understand this energy trio:ĬONVECTION: is heat transferred by moving “fluid” (aka, air). And just like the stool, take away any one of the three and the stool falls over. Similar to a 3-legged stool, all three are integral for efficient comfort. There are inherently three primary ways a house loses/gains heat: APPLIES TO ALL RADIANT BARRIERS DESIGNED IN ACCORDANCE WITH ASTM C1313 Proceedings of the 9th Symposium on Improving Building Systems in Hot and Humid Climates. * “Effects of Radiant Barrier Technology on Summer Heat Load in South Texas” R. eShield™ is the best solution because only a radiant barrier can reflect 97% of the infrared heat without losing its reflectivity over time. The heat generated inside the living space needs to be prevented from escaping, especially at night when the temperatures drop the most.Īs heat conducts to the drywall and attic insulation, the mass of those objects store and re-emit the heat in the form of infrared energy. With the attic cooler, the insulation below won’t have to work as hard because it will be under a lighter load, and the A/C doesn’t have to work as hard and won’t have to cycle on as often to maintain the lower temperature.ĮShield™ radiant barrier works best in the summer, but it also helps during the winter. When eShield™ radiant barrier is installed in the attic, the infrared heat is reflected out before it can penetrate any further, reducing the temperature of the attic by as much as 30 degrees F. In the summer, the heat from the roof emits down through the attic into the living space. More moderate attic temperatures with higher effciency heating and cooling mean greater overall comfort in your home.ĮShield™ reduces ceiling heat flux by as much as 60%*.eShield™ insulates HVAC equipment allowing for fewer air exchanges to reach target air temperatures resulting in lower utility bills.The multilayer foil insulation reflects up to 97% IR in both directions, helping to reject heat in the summer and retain heat in the winter.This results in more comfortable ceilings and floors, and therefore a more comfortable you. eShield™ installed in your attic and crawlspace works by reflecting out the radiant heat in the summer and reflecting back in the radiant heat in the winter. Ideally, you want your walls and ceiling to be a few degrees warmer than your skin during the winter and a few degrees cooler in the summer.ĮShield™ radiant barrier is specifically designed around radiant heat transfer. Just like windows and walls that get direct sun are always warmer, if warm surfaces are radiating heat onto your skin, your body can’t cool down and you set the thermostat lower. Thermal radiation accounts for up to 2/3 of your body’s ability to regulate temperature. Your thermostat controls the air temperature but has no way to measure or regulate “how it feels” in the house. This is achieved by reducing fluctuations in mean radiant temperature.Ĭomfort is influenced by both air temperature (convection) and the temperature of the surfaces around you (thermal radiation). This directly results in more comfortable living spaces regardless of the temperature setting on your thermostat. More moderate attic temperatures means less load on attic insulation, which results in lower ceiling temperatures in summer (and higher in winter).
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