What is the purpose of using double pipe heat exchanger?

Double-pipe heat exchangers are used in many industries because of their low design and maintenance costs, flexibility, and low installation costs [25]. They are mainly used for sensible heating or cooling of process fluids in applications of small heat transfer areas of up to 50 m2 [38].

What is a double pipe exchanger?

DOUBLE PIPE HEAT EXCHANGER. A double pipe exchanger consists of one or more pipes or tubes inside a pipe shell. Basically two straight pipe lengths are connected at one end to form a U or “hair-pin.” Longitudinal fins may be used on the outside of the inner tube.

How does an air heat exchanger work?

How Does An Air To Air Heat Exchanger Work? An air to air heat exchanger uses a heat pipe to transfer heat from a hot enclosure to the cooler ambient air. The resultant vapor rises to the top of the tube and is condensed by the cooler ambient air when giving up its heat. The process is continuously repeated.

What is the principle of heat exchanger?

Working Principle A heat exchanger works on the simple principle of second law of thermodynamics; the heat flow from a body to another in respect of their temperature difference. The heat under natural state will move from a hot body to a cooler one.

What are the characteristics of double pipe heat exchanger?

It consists of concentric pipes separated by mechanical closures. Inexpensive, rugged and easily maintained, they are primarily adapted to high-temperature, high-pressure applications due to their relatively small diameters. Double pipe heat exchangers have a simple construction.

What is the main disadvantage of double pipe heat exchanger over the shell & tube heat exchanger?

The disadvantage of the double-pipe heat exchanger is that it covers a large area. At the same time, the metal consumption per unit heat transfer area is much, about 5 times that of the shell-and-tube heat exchanger. There are many pipe joints, which are easy to leak and large flow resistance.

Which flow option would you choose for a double pipe heat exchanger?

In double pipe heat exchanger design, an important factor is the type of flow pattern in the heat exchanger. A double pipe heat exchanger will typically be either counterflow or parallel flow.

What are the two types of heat exchangers?

There are two main types of regenerative heat exchangers—static heat exchangers and dynamic heat exchangers.

What are examples of heat exchangers?

They are commonly used on systems with gas-liquid or vapor-liquid heat exchange, wherein the gas or vapor is the process fluid. The liquid is contained in a tube and the gas flows outside those tubes. Examples of a cross flow heat exchanger are steam condensers, radiators, and air conditioner evaporator coils.

What are the 4 types of heat transfer?

Various heat transfer mechanisms exist, including convection, conduction, thermal radiation, and evaporative cooling.

What are the two types of heat exchanger?

Which is the major mean of heat transfer in a double pipe heat exchanger?

conduction
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).

How does a double pipe heat exchanger work?

Double Pipe Heat Exchangers- Heat exchangers are devices that transfer or exchange heat between two fluids without mixing and include various types depending on the design, application, required space, and the fluid flows in the system. All the heat exchangers have a barrier that separates the fluids and allows the heat transfer simultaneously.

Which is the simplest type of heat exchanger?

A form of shell and tube heat exchanger, double pipe heat exchangers employ the simplest heat exchanger design and configuration which consists of two or more concentric, cylindrical pipes or tubes (one larger tube and one or more smaller tubes).

What kind of fins are used in double pipe heat exchangers?

These would always be longitudinal fins, rather than the more common radial fins used in a cross-flow finned tube heat exchanger. In a double pipe heat exchanger design, an important factor is the type of flow pattern in the heat exchanger. A double pipe heat exchanger will typically be either counterflow or parallel flow.

How is the heat transfer in a heat exchanger determined?

The heat transfer in a shell and tube heat exchanger is determined by the exposed surface area that is decided by the number of thermally conductive metal tubes. The fluid flow inside the shell and tube heat exchanger can be parallel flow or crossflow.