Heat Radiation Law Of Closed Cooling Tower

Regarding the thermal radiation of closed cooling towers, there are four important laws: Kirchhoff's radiation law, Planck's radiation distribution law, Stefan-Boltzmann's law, and Wien's displacement law. These four laws are sometimes collectively referred to as the laws of thermal radiation. While an object radiates outward, it also absorbs energy radiated from other objects. The energy radiated or absorbed by an object is related to its temperature, surface area, blackness and other factors. However, in the thermal equilibrium state, the ratio of the spectral radiant emission of the radiator to its spectral absorption ratio is only a function of the radiation wavelength and temperature, and has nothing to do with the nature of the radiator itself. A black body is a special radiator whose absorption ratio to all wavelengths of electromagnetic radiation is always 1. The black body does not exist under natural conditions, it is only an idealized model, but it can be artificially produced to be close to the analogue of the black body. That is, a small hole is opened on the wall of a closed cavity. After light of any wavelength enters the cavity through the small hole, it is repeatedly reflected on the inner wall of the cavity, and the chance of passing through the small hole again is extremely small, even if there is a chance Passing out, most of the energy is lost due to multiple reflections. For observers outside the cavity, the absorption ratio of the small hole to any wavelength of electromagnetic radiation is close to 1, so it can be regarded as a black body. Apply Kirchhoff's radiation laws to black bodies.www.gwbrefrigeration.com