![]() ![]() We like to wear light-colored clothing in the summer to maximize the reflection of solar radiation and dark clothing in the winter to absorb solar radiation. Designs of homes take advantage of this by siting their walls, windows, and landscaping to capture the levels of light needed for optimum growth of indoor and outdoor plants, to reduce the solar heating at times of year and day when outside temperatures exceed human comfort levels, and to maximize solar heating when outside temperatures are uncomfortably cold. ![]() Solar radiation is the primary source of warmth for land, and the driver of plant photosynthesis. Dickinson, in Encyclopedia of Atmospheric Sciences, 2003 What Determines the Land Surface Absorption of Solar Radiation? No responsibility can be assumed by ThermoWorks for the accuracy or otherwise of the following figures.R.E. We would recommend, in the first instance, comparing measurements, found with an accurate surface probe or wire probe, and then the Infrared thermometer can be adjusted to match the correct emissivity and used for subsequent measurements. The accuracy of the following figures is almost impossible to guarantee as the emissivity of a surface will not only alter with regard to texture and colour but also with its actual temperature at the time of measurement. In the real world, there are no perfect "black bodies" and very few perfect infrared mirrors so most objects have an emissivity between 0 and 1. A material with an emissivity value of 0 would be considered a perfect thermal mirror.įor example, if an object had the potential to emit 100 units of energy but only emits 90 units in the real world, then that object would have an emissivity value of 0.90. A black body is a material that is a perfect emitter of heat energy and has an emissivity value of 1. It is defined as the fraction of energy being emitted relative to that emitted by a thermally black surface (a black body). ![]() Emissivity is a measure of the efficiency in which a surface emits thermal energy. ![]()
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