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Heat Transfer

Q1: Which of the following is not used as a medium for high temperature heating ?

A Dowtherm

B mercury

C liquid metal (e.g. molten sodium)

D fused salts (e.g., an eutectic mixture of 53% KNO3, 40% NaNO2and 7% NaNO3)

ANS:B - mercury

Mercury is not commonly used as a medium for high-temperature heating. While it has a relatively high boiling point for a liquid, it is not typically used as a heat transfer fluid for high-temperature applications due to its high toxicity and potential environmental hazards. Dowtherm, liquid metal (such as molten sodium), and fused salts (eutectic mixtures) are all used as mediums for high-temperature heating in various industrial processes. These fluids are chosen for their ability to withstand high temperatures and their compatibility with the materials used in high-temperature systems. Therefore, the correct answer is: mercury.

 



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