Sentences with phrase «emissivity e»

... For example, the formula given by JBS that T = (e + f - ef) / (e * (2 - e)-RRB--RRB- **.25 * TB can't really be correct since setting the solar input fraction f to zero does not reproduce temperature of the earth TB unless the emissivity e is equal to unity.

Still more generally consider n graybody shells (emissivity e) numbered from the top.

If the top layer is not arbitrarily thin but instead has emissivity e then its temperature will be TB * (2 - e) ** -LRB--.25).

Let the top layer be a gray body with emissivity e and suppose it also absorbs a fraction f of the incoming solar radiation.

More generally assume the top shell is a graybody shell with emissivity e.

Not exact matches

Consider a slab atmosphere modeled as a gray body (at long wavelengths) with emissivity «e».

It's built using FSC (or Forest Stewardship Council — an international non-profit organization that promotes responsible forest management) certified wood and sports a metal roof, along with efficient low - emissivity (Low - E) windows, which offer more insulation than standard windows.

where temperature at the top of the atmosphere Ta is in Kelvin, s is the Stefan — Boltzmann constant, 5.67 x 10 — 8 W / m2K4, and e is emissivity (about 1 for 10 — micron infrared).

For homes in colder climates, gas - filled windows with low emissivity (low - E) coatings can significantly reduce heat loss.

A low emissivity (low - e) coating is also applied to some of the glass surfaces.

Extremely thin coatings of special low emissivity (Low E) metallic material are applied to glass panes used in windows and doors to boost their energy efficiency.

Output is blackbody radiation, given by E (out) = a T ^ 4 where a is a constant (emissivity * Stephan - Boltzman) and T is the temperature.

I did all my analysis with a «total» emissivity et, but in terms of total optical thikness tau it is: tau = - ln (1 - et) or et = 1 - e ^ - tau

- Low - e windows (the «e» stands for emittance or emissivity) feature a metallic oxide coating that doesn't let heat or UV - rays pass through, which will keep warm air in during the winter and prevent heat from the blazing summer sun from turning your home into a sauna in the summer.

Though more windows typically means greater energy loss, these low - E (low - emissivity) units have a special coating that helps keep heat in during the winter and out during the summer.