IR in building physics

Abstract Today, IR physics shows a wide range of application to building physics! IR-reflecting facade elements can lower the heat consumption of buildings in the order of 10–20 %. (2) In the case of window systems, for example, a transparent heat-mirror plastic film in the cavity between the panes approximately halves the U -value of a conventional double glazing system. Another approach to reduce the energy load of buildings—especially in desert regions—is the application of movable IR-emitting elements during clear nights to take advantage of the nocturnal radiation deficit for cooling the houses. On the other hand, IR thermography is a useful tool for locating insulation defects, thermal bridges and by-passes, points of air leakage and areas of moisture damage. IR plays not only a fundamental role in the case of energy savings and thermographic measurements, it also strongly influences the thermal comfort of the human being.