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  • Double Pipe Heat Exchangers
  • Double Pipe Heat Exchangers

Double Pipe 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. The double pipe heat exchanger is one of the basic kinds of exchangers with a very flexible configuration.

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Product Description

Double Pipe 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. The double pipe heat exchanger is one of the basic kinds of exchangers with a very flexible configuration.


Types of Double Pipe Heat Exchangers
Double pipe heat exchangers can be categorized based on the flow direction. Parallel flow and counter flow can be deployed in these exchanges, and it is all about the position of inlets and outlets. Choosing the parallel and counter flow affect the heat transfer and the pressure drop in the system, by the way in some application you should choose one from other.

Counter Flow Double Pipe Heat Exchangers
The best design for a double pipe heat exchangers is counter flow. In this pattern, the heat exchanger has the optimum heat transfer coefficient and can cold or heat the outlets as we desire. The main advantage of a hairpin or double pipe heat exchanger is that it can be operated in a true counter flow pattern, To get more efficiency, In the mean time, it will give the highest overall heat transfer coefficient for the double pipe heat exchanger design.

Parallel Flow Double Pipe Heat Exchangers
Parallel flow is the type that the inlets and outlets are in one head. Heat transfer is less than the counterflow, and the efficiency is low. Parallel Flow double pipe heat exchangers are focused to handle high pressures and temperatures applications. Also we can Achieve High Log mean Temperature using this.



Model Product capacity (T/H) Working temperature (°C) Heat exchanger area(m2) The Diameter of Pipe(mm)
LEX-1 1

20-147°C

(According to customer requirements)

0.1~20M2 Φ6/Φ9/Φ12/Φ16/Φ19/Φ25mm
LEX-2 2
LEX-3 3
LEX-5 5
LEX-8 8
LEX-10 10
LEX-15 15
LEX-20 20
LEX-30 30

Determination of the heat transfer surface area needed for a double pipe heat exchanger design can be done using the basic heat exchanger equation: Q = UA ΔTlm, where:
Q is the rate of heat transfer between the two fluids in the heat exchanger in Btu/hr,
U is the overall heat transfer coefficient in BTU/hr-ft2-oF,
A is the heat transfer surface area in ft2, and
ΔTlm is the log mean temperature difference in oF, calculated from the inlet and outlet temperatures of both fluids.

These parameters in the basic heat exchanger equation are discussed. in After determination of the required heat transfer surface area, the diameter and length of the inner pipe can be selected and then the diameter of the outer pipe. Finally, the length of the straight sections and the number of bends can be selected.


Advantages of Double Pipe Heat Exchangers
This type of exchanger has some unique advantages over other complicated heat exchangers. The main benefits of double pipe heat exchangers are listed below:

1. You can provide good efficiency with lower capital costs.
2. They are small compared to the shell and tube and do not need much space for maintenance, while the heat transfer is acceptable.
3. As they are very popular, all the parts have been standardized, and it makes the repair and maintenance very easy.
4. They have a flexible design, and other addition and removal parts can be done easily.
5. You can use this type of exchanger at high pressure and temperature.
6. The design of the exchanger allows more thermal expansion without any expansion joint.


The applications of double pipe heat exchangers are a lot, and it is hard to encompass all, and it is all because of the practical, elegant, and simple design. A few of them are as below:

Boilers and compressors as they have high temperatures and pressures
Cooling and heating in process engineering systems
Petroleum refining
Refrigeration
Sewage treatment

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