Question

explane the principal of heat exchanging

Answer 1

In essence, thermochromism is the principle on which color-changing mugs and other such objects work. The thermochromic paint or the heat-sensitive coating contains pigments that change color according to changes in the surrounding temperature.

Answer 2

A heat exchanger is a system used to transfer heat between two or more fluids. Heat exchangers are used in both cooling and heating processes. The fluids may be separated by a solid wall to prevent mixing or they may be in direct contact