Question

Direct and indirect heating in heat exchanger

Answer 1

Explanation:

Quite simply, direct heating technology involves a bulk solid material coming into direct contact with a heating gas to change the final temperature of the material. On the other hand, indirect heating technology does not allow the product to come in contact with air or gas or any other heating agent to change the final temperature. Indirect heat transfer uses conduction, radiation or convection to achieve temperature change. There are various types of technologies used in both the direct and indirect heating of bulk solids.