What type of deposits reduce heat transfer across surfaces and act as insulators?

What type of deposits reduce heat transfer across surfaces and act as insulators?

• A. Sludge
• B. Scale
• C. Corrosion
• D. Dirt

Answer: (B)

Scale deposits are hard, crystalline formations that form on the surfaces of pipes, boilers, and heat exchangers where there is significant exposure to water, particularly in high-temperature and high-pressure environments. These deposits are primarily composed of mineral salts, such as calcium carbonate or magnesium silicate, which precipitate out of water as it evaporates or is heated. The presence of scale can significantly reduce the efficiency of heat transfer across surfaces because the scale acts as an insulating layer. As a result, the thermal conductivity of the heat exchanger or boiler is diminished, leading to less effective heat transfer and increased fuel consumption or energy usage to maintain temperature levels. This can cause operational inefficiencies and increase maintenance needs, as well as the potential for overheating and damage to equipment. In summary, scale deposits are particularly detrimental because they not only reduce heat transfer but also contribute to increased operational costs and the potential for mechanical failures if not managed properly.

Scale deposits are hard, crystalline formations that form on the surfaces of pipes, boilers, and heat exchangers where there is significant exposure to water, particularly in high-temperature and high-pressure environments. These deposits are primarily composed of mineral salts, such as calcium carbonate or magnesium silicate, which precipitate out of water as it evaporates or is heated.

The presence of scale can significantly reduce the efficiency of heat transfer across surfaces because the scale acts as an insulating layer. As a result, the thermal conductivity of the heat exchanger or boiler is diminished, leading to less effective heat transfer and increased fuel consumption or energy usage to maintain temperature levels. This can cause operational inefficiencies and increase maintenance needs, as well as the potential for overheating and damage to equipment.

In summary, scale deposits are particularly detrimental because they not only reduce heat transfer but also contribute to increased operational costs and the potential for mechanical failures if not managed properly.