# Emissivity sentence example

emissivity

- argon filled low emissivity double glazing.
- The windows and rooflights are softwood frame with double glazed argon filled low emissivity glass.
- All windows are timber-framed with argon filled low emissivity double-glazing.
- emissivity of a body is equal to its absorbance at the same temperature.
- A perfect black body radiator has an emissivity of unity, so all other surfaces have emissivity between zero and one.Advertisement
- Timber frame double glazed low emissivity coated windows, with a non-solvent stain are used throughout.
- It also measured the radar emissivity, radar reflectivity, gravity and radio occultation data.
- In order to calculate an emissivity we first need to determine the transmitted and reflected components.
- To alleviate such difficulties, it is common to assume a uniform emissivity over the entire wavelength spectrum.
- To remove the use of UPVc, softwood windows are used, with low emissivity double glazing.Advertisement
- The spectral and total emissivity can then be calculated using the above equations.
- Blackbody lamps have a higher emissivity (0.99) and therefore can be used over a wider wavelength range and to higher radiance temperatures.
- All measurement tools allow independent emissivity and distance settings.
- emissivity glass.
- emissivity settings or temperature ranges.Advertisement
- emissivity values in excess of ten per cent.
- emissivity index.
- emissivity films will: Reject up to 69% of unwanted solar energy.
- emissivity coating is on the inner pane facing the cavity.
- Differences arise due to simplifications in the treatment of surface emissivity, and also errors due to the treatment of cloud microphysics.Advertisement
- CO abundances relative to dust depend on the assumed temperature and hence on the dust emissivity index.
- No degradation of telescope IR emissivity, which is a crucial advantage for a system with strong science drivers in the infrared.
- Consider the following configuration: Figure 1 depicts a circular solar panel with two layers of high transmittance, low emissivity glass.
- The heat generated by the current C at a point x where the temperature-excess is 0 is equal per unit length and time (t) to that lost by conduction -d(gkdo/dx)/dx, and by radiation hpo (emissivity h, perimeter p), together with that employed in raising the temperature gcdo/dt, and absorbed by the Thomson effect sCdo/dx.
- But later experimental researches have shown that the simple assumption of constant coefficients of conductivity and emissivity, on which the mathematical theory is based, is in many respects inadequate, and the special mathematical methods developed by J.Advertisement
- This he called the external conductivity, but the term emissivity is more convenient.
- Taking Newton's law of cooling that the rate of loss of heat is simply proportional to the excess of temperature, the emissivity would be independent of the temperature.
- The emissivity really depends on every variety of condition, such as the size, shape and position of the surface, as well as on its nature; it varies with the rate of cooling, as well as with the temperature excess, and it is generally so difficult to calculate, or to treat in any simple manner, that it forms the greatest source of uncertainty in all experimental investigations in which it occurs.
- It is the most convenient method, in the case of good conductors, on account of the great facilities which it permits for the measurement of the temperature gradient at different points; but it has the disadvantage that the results depend almost entirely on a knowledge of the external heat loss or emissivity, or, in comparative experiments, on the assumption that it is the same in different cases.
- The heat transmitted should be measured calorimetrically, and not in terms of the uncertain emissivity.Advertisement
- The emissivity was reduced to one-quarter by lagging the bar like a steam-pipe to a thickness of i in.
- The rate of diminution of amplitude expressed by the coefficient a in the index of the exponential is here greater than the coefficient b expressing the retardation of phase by a small term depending on the emissivity h.