Heat Transfer II -- What is the purpose of a silvered coating?

In summary, the purpose of a silvered coating on the outside of most insulation is to reduce the surface's emissivity and reflect radiated heat back into the room, thereby reducing heat loss. It also serves as a protective layer against wear and damage. The heat transferred by convection is negligible due to the thin layer.
  • #1
Tiberious
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3

Homework Statement



(a) What is the purpose of a silvered coating, usually of a good conductor, on the outside of most insulation?

The Attempt at a Solution


[/B]
The silver coating on the outside of most industrial pipes and lagging (Insulation) is primarily to reduce the surface’s emissivity (e). For example; with respect to a wall in a home with a silver coated thermal insulator behind the plasterboard. The reduction in emissivity allows the surface of the insulator to reflect some of the radiated heat back into the room thus reducing heat loss. Furthermore, it serves as a protective layer for the lagging (insulator) against wear and damage. The heat transferred by convection has a negligible impact as the layer is thin.

Is this a reasonable attempt ?
 
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  • #2
Looks basically okay to me, but I'm no expert in thermodynamics. :smile:
 

FAQ: Heat Transfer II -- What is the purpose of a silvered coating?

1. What is a silvered coating?

A silvered coating is a thin layer of silver applied to a surface, typically glass, to create a mirror-like effect.

2. What is the purpose of a silvered coating?

The purpose of a silvered coating is to reflect and redirect thermal radiation, which is a type of heat transfer, away from a surface.

3. How does a silvered coating prevent heat transfer?

The silvered coating is highly reflective, meaning it can reflect a large amount of thermal radiation back in the direction it came from. This prevents the thermal radiation from being absorbed by the surface, reducing the amount of heat transferred.

4. What materials are commonly used for silvered coatings?

In addition to silver, other materials such as aluminum, gold, and copper can also be used for silvered coatings. These materials also have high reflectivity and can effectively prevent heat transfer.

5. Where are silvered coatings commonly used?

Silvered coatings are commonly used in household mirrors, telescopes, and solar panels. They are also used in construction materials, such as windows and insulation, to reduce heat transfer and improve energy efficiency.

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