Direct Contact Heat Exchanger

Direct contact heat exchanger involve heat transfer between hot and cold streams of two phases in the absence of a separating wall.Thus such heat exchangers can be classified as:

• Gas – liquid
• Immiscible liquid – liquid
• Solid-liquid or solid – gas

Most direct contact heat exchangers fall under the Gas- Liquid category, where heat is transferred between a gas and liquid in the form of drops, films or sprays.

Such types of heat exchanger are used predominantly in air conditioning, humidification, water cooling and condensing plants.