What is the working principle of shell and tube heat exchanger?

The working of a shell and tube heat exchanger is fairly simple. One fluid flows inside the tubes and the other through the shell. While flowing they exchange the heats which means the cold fluid gains the heat from the hot fluid.

What is the working principle of double pipe heat exchanger?

The double pipe heat exchanger works via conduction, where the heat from one flow is transferred through the inner pipe wall, which is made of a conductive material such as steel or aluminum. The double pipe heat exchanger is often used in counterflow, where its fluids move in opposite directions (as shown above).

What are the principal types of shell and tube construction?

There are two distinct types of shell and tube Heat Exchangers, based in part on shell diameter. Designs from 2″ to around 12″ in shell diameter are available that feature shell constructions of low cost welded steel, brazed pipe with hub forgings, cast end Bonnets and copper tubing rolled or brazed to the tube sheet.

How does a spiral heat exchanger work?

In a spiral heat exchanger, each fluid flows through a single channel. If suspended solids settle on the heat transfer surface, the increased fluid velocity creates a scrubbing effect that removes the deposits. At the same time, the cold fluid enters at the periphery and spirals inward, exiting at the center.

What is compact heat exchanger?

A compact heat exchanger (CHE) is a piece of equipment built for efficient heat transfer from one medium to another, being characterised by large heat transfer area-to-volume ratio (minimum 300 m2/m3), high heat transfer coefficients (up to 5000 W/m2K), small flow passages, and laminar flow.

How does a cross flow heat exchanger work?

A cross-flow heat exchanger exchanges thermal energy from one airstream to another in an air handling unit (AHU). Unlike a rotary heat exchanger, a cross-flow heat exchanger does not exchange humidity and there is no risk of short-circuiting the airstreams. The thermal energy is exchanged via the panels.

What makes a good heat exchanger?

The heat from one fluid passes across the metal (which is thermally conductive) into the other fluid without the fluids making contact. High fluid velocity, high turbulence, high surface area and a large temperature differential all contribute to more efficient heat transfer.

What are three types of heat transfer?

Heat can be transferred in three ways: by conduction, by convection, and by radiation.

• Conduction is the transfer of energy from one molecule to another by direct contact.
• Convection is the movement of heat by a fluid such as water or air.
• Radiation is the transfer of heat by electromagnetic waves.

What is recuperator & regenerators?

Regenerators and recuperators are heat exchange systems that recover heat by cycling through heat sinks (regenerators) or through a high temperature metallic heat exchanger (recuperators). II Applications. The heat recovered by a regenerator or recuperator is most commonly used to preheat combustion air to a furnace.

What are the principles of heat exchanger?

Principles of heat exchangers Simplified heat exchanger concepts Heat exchangers work because heat naturally flows from higher temperature to lower temperatures. Therefore if a hot fluid and a cold fluid are separated by a heat conducting surface heat can be transferred from the hot fluid to the cold fluid.

How does a shell and tube heat exchanger work?

As with other heat exchanger designs, shell and tube exchangers are set up to have product and heating/cooling fluids flow in opposite directions. For example, cold product fluid travels from right to left in the heat exchanger while the warming fluid travels from left to right over the product tubes.

What is the difference between a heat exchanger and fluid?

In general, one fluid has to be significantly hotter than the other. So, we have a hot and a cold fluid. And a heat exchanger enables the heat to flow from hot fluid to cold through a metallic wall. Heat exchanger channels the flow of hot and cold streams through passages separated from each other by metal surface.

How do you increase the efficiency of a heat exchanger?

These fluids can be single or two phase, may be separated or in direct contact depending on the exchanger type. To increase the efficiency of the heat exchanger, there should be increment in the surface area of the wall between the two fluids and minimize the resistance of fluid flow through the exchanger.