Radiator - Wikipedia

May 17, 2023 – 05:04 am
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A radiator is a body heat mainly by thermal radiation releases. Radiators have a large surface with high emissivity and are usually made ​​of a good heat conducting metal.

Radiators heat exchanger (heat exchanger). Through the radiator, a medium (usually in the heat infrared ) radiate. The hotter, the greater the amount of heat that can be radiated per unit of time and area. Double temperature in Kelvin causes 16 times the energy radiation ( Stefan-Boltzmann law ). In calculating the net quantity of heat transferred is the exposure to be considered at the radiator ( exchange radiation ).

As high as possible in the region of maximum emission of the heat radiation to improve emissivity. The range of the maximum emission is shifted depending on the absolute temperature of the mid-infrared at room temperature to the temperatures of a plurality of near infrared from 100 to 1000 ° C. The emissivity is determined by the surface material and texture. A rough or jagged surface increases the emissivity. Oxide layers on metal and ceramic has a very high emissivity in the Middle infrared. In the near infrared, it is difficult to manufacture with a high surface emissivity.

[ Bearbeiten ] Combination with other heat transfer mechanisms [ Edit ]

The proportion of thermal radiation to the total heat release is for example in hot water heating systems due to the low absolute temperature insignificant, so that the names or convector heating or cooling body would be more accurate. The term radiator for heating varies regionally common.

The emissivity can be improved but also at low temperatures by a high emissivity. Decisive here is the emissivity in the mid infrared, it is in a paint coating of any color close to 100%.

Can greatly improve the heat dissipation through a large surface area, favorable shape for free convection or even arranged by the radiator fan. You should dissipate immediately surrounding, air warmed by heat transfer. This forced convection is highly increasing the heat dissipation and reduces the power required for a given heat temperature difference.

[ Bearbeiten ] Examples of radiators [ Edit ]

Characteristic is the ribbed design, therefore large surfaces are achieved. Heat sink aluminum sheet or aluminum - casting - profiles are the usual heatsink of power semiconductors . The cooling fins of an air cooled engine engine block also provide basically represents a radiator

Source: de.wikipedia.org

Mill finish aluminum acts as a heat sink

2006-09-10 13:12:26 by very_inefficient

Traditional aluminum windows suck, but the newer vinyl clad ones are nice...there's a huge range of quality in vinyl windows, some look cheap and others are comparable to clad alum. as far as looks go.
As far as movement and stability goes, vinyl frames tend to be succeptible to movement compared to aluminum, especially if they aren't carefully shimmed when installed (no spot shimming on sills allowed)- vinyl by itself isn't the greatest structural material. Aluminum on the other hand is a great structural material, especially when it's an extruded channel like they build windows out of

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