![]() But those glazings also blocked that same radiation during the heating season and could unintentionally increase heating loads. Buildings that are equipped with the low-e glazings are estimated on average to reduce annual energy use by five to 15 percent over buildings with conventional glazings.Įarly generations of low-e coatings were effective in reducing building cooling loads by blocking infrared radiation from the sun. ![]() The coating reflects the long-wave infrared radiation from inside the building back inside, reducing heat losses. During the heating season, the reverse is true. During the cooling season, the coating reduces the heating load on the building’s air conditioning system. The coating limits the amount of ultraviolet and infrared light while allowing visible light to pass through. Low-e glazings use a thin, nearly transparent coating to improve energy efficiency of buildings in several ways. But a desire to improve building energy efficiency along with more advanced coatings has increased the use of these glazings in both the new construction and the retrofit markets. Low-e glazings have been in use since the 1970s. One established technique to achieve this level of balance is the use of low-emissivity, or low-e, glazings. ![]() High-performance building strategies will allow building owners to improve occupant comfort while minimizing energy and water use. keeping operating costs as low as possible.controlling the difference between the indoor and outdoor environments,.To be successful, the building envelope must achieve a balance among four factors: And they can perform all of these activities through a combination of active and passive strategies.īuilding envelopes have long been recognized for their role in protecting the building and its contents from the elements and for how they affect total building energy use. They can harvest and put to use rainwater. They can provide levels of fresh air to building occupants based on occupancy levels. They can respond to changes in interior and exterior conditions. High-performance building envelopes, like their conventional design counterparts, protect the building and its occupants from the elements. These advances - which form the foundation for today’s high-performance buildings - touch almost every element in building operations, including the building envelope. Owners are finding that their use is resulting in improved occupant comfort and productivity. The benefit of these advances does not stop with improved operating efficiencies. Some of these advances are entirely new, while others are improvements on existing technologies. Advances in building technology, construction techniques, and operating strategies are helping building owners to achieve efficiencies in energy and water use that were out of reach even in the recent past.
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