Heat Exchanger: The Process Of Heat Transfer In The Engineering Process

Heat exchanger is a device used for the process of heat exchange between the two fluids that are at different temperatures. The heat exchangers can be described by the principles of evaporation or condensation, conduction, radiation and convection. Heat exchangers are useful in many engineering processes like those in air conditioning systems and refrigeration, food processing systems, chemical reactions, and power systems.

When two systems are bought into contact through some kind of energy transfers such as work and heat take place between them. The transfer and conversion of energy from one form to another is basic to all heat transfer processes and hence they are governed by the first as well as the second law of thermodynamics. It deals with systems in

Increase in convectional heat transfer by reducing the thermal resistance in a heat transfer.

By using heat transfer enhancement techniques lead to increase in heat transfer coefficient but at the cost of increase in pressure drop. Here, when designing a heat exchanger using any of these techniques, pressure drop and analysis of heat transfer rate has to be done.

Mainly experiment was concentrated on heat transfer by convection which occur when a temperature difference exists between a solid and a fluid flowing past it. The energy transport affected by the circulation or mixing of a fluid medium which may be a liquid, a powdery substance, or a gas. The transport of heat transfer during convection is directly linked with the transport of the medium itself, and as such convection presents a combined problem of conduction and mixing. The conventional energy transfer is predominantly due to the bulk motion of the fluid particles, though the molecular conduction within the fluid itself also contributes to some