What are the advantages of double pipe heat exchanger?

Advantages of Double Pipe Heat Exchangers You can provide good efficiency with lower capital costs. They are small compared to the shell and tube and do not need much space for maintenance, while the heat transfer is acceptable.

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.

What is the advantage of a shell and tube heat exchanger over a double pipe heat exchanger?

The advantage is it is simple to construct and easy to operate. However, in shell and tube HE, we can pack a large heat transfer area within a small volume. As the numbers of tubes are more in a shell and tube HE, we can expect a higher turbulence which will result in higher heat transfer rates.

What are the disadvantages of heat exchanger?

Leakage and pressure drops in the system are two possible disadvantages of heat exchangers. Leakage in the process of heat transfer is difficult to prevent and repair.

What is a double pipe 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.

Which double pipe exchanger is more efficient and why?

They can also be used in parallel flow where both fluids move in the same direction, but counterflow is often the most thermally efficient regime. Double pipe exchangers can handle high pressures and high temperatures because they are able to freely expand and have solid, simple construction.

What is the biggest disadvantage to concentric tube heat exchangers?

There are significant disadvantages however, the two most noticeable being their high cost in proportion to heat transfer area; and the impractical lengths required for high heat duties. They also suffer from comparatively high heat losses via their large, outer shells.

What is double pipe?

The double pipe heat exchanger is, in its simplest form, one pipe held concentrically inside of a larger pipe (thus the name “double pipe”). They are also often referred to as hairpin, jacketed pipe, jacketed u-tube, and pipe-in-pipe exchangers.

Why shell and tube is better than double pipe?

One pipe is for hot fluid and another is for cold fluid. Also in case of shell & tube(S) the hot fluid will have more turbulence than in double pipe heat exchanger (HE) since there are no of tubes within a shell the area for convective heat transfer is considerably increased. so these are much more preferred.

What is the advantage of heat exchanger?

One of the greatest benefits of modern heat exchangers is that they do not rely on additional equipment, such as an air conditioning or air compressing unit, to operate. Therefore, they use significantly less energy and produce little or no pollution compared to more conventional cooling methods.

How does a double pipe heat exchanger work?

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 is a double heat exchanger?

The simplest form of double heat exchanger (see images below) is a single pipe placed concentrically inside a larger pipe. The inner pipe can be plain or have longitudinal fins attached to increase the surface available for heat transfer.

What are the disadvantages of heat exchanger design?

Disadvantages are difficult to clean fouled tubes due to the bend, Total disassembly can provide access to the outside of the tube but the inside surface is still difficult. You are probably aware there are many types of heat exchanger design. Each has its own special features and advantages.

Why is counterflow used in a double pipe exchanger?

True counterflow is achieved in double pipe exchangers because of the concentric tube (s), and designers take advantage of this to increase the system’s heat transfer coefficient. They can also be used in parallel flow where both fluids move in the same direction, but counterflow is often the most thermally efficient regime.

What is a hair pin heat exchanger?

The most widely used double pipe heat exchanger is the hair pin. The high stresses produced by differential thermal expansion between outer and inner pipes are more easily handled. Manifolding of a multiple hair-pin setup is easily accommodated.