1. Introdução

Heat transfer is critical to many aspects of industrial production.

As a result, producers require efficient and reliable heating and cooling equipment.

Pipe in Pipe Heat Exchangers offer a straightforward heat transfer solution with flexibility.

This exchanger simply places one pipe inside another larger pipe.

As such, two fluids can efficiently transfer heat without contacting each other.

Additionally, the design is easy to understand and maintain due to its simplicity.

Pipe in pipe heat exchangers work with many liquid and gas services.

They provide heat transfer solutions to chemical, oil and gas, food processing, HVAC, and industrial plants. Here at Bangwin Thermal, we specialize in industrial heat exchangers.

Bangwin Thermal can customize heat exchangers to your specific application.

2. What Are Pipe in Pipe Heat Exchangers

Pipe in Pipe Heat Exchangers consist of two pipes; one inside the other.

The inner pipe contains one fluid while the outer pipe contains another.

Therefore, the inner pipe separates both fluids from each other.

Heat can easily transfer through the inner pipe wall between both fluids.

Typically, a pipe in pipe heat exchanger will consist of:

• Inner pipe

• Outer pipe

• Fluid connections

• End fittings

• Support structure

Exchangers can be made from various materials to suit different conditions.

Materials include:

• Aço carbono

• Aço inoxidável

• Cobre

• Aluminium

• Ligas de níquel

As such, designers can use different materials to handle different temperatures, pressures, and fluids.

The uncomplicated design allows manufacturers to customize many different parts.

3. How Pipe in Pipe Heat Exchangers Work

Pipe in pipe heat exchangers transfer heat through conduction and convection.

First, the hot fluid will run through one pipe while the cold through the second pipe.

The heat will naturally travel from the hot fluid, through the pipe wall.

Finally, the cold fluid will take the heat away from the exchanger.

Pipe in pipe heat exchangers can operate in counterflow or parallel flow arrangements.

3.1 Counterflow Arrangement

In counterflow heat exchangers, both fluids run in opposite directions to each other.

As a result, the temperature gradient is more uniform throughout the exchanger.

Consequently, this allows counterflow heat exchangers to reach high thermal efficiencies.

3.2 Parallel Flow Arrangement

Fluxo paralelo pipe in pipe heat exchangers run both fluids in the same direction.

As a result, the temperature gradient varies more significantly throughout the exchanger.

Some processes may benefit from parallel flow heat exchangers.

Generally, counterflow heat exchangers are more desirable when possible.

4. Pipe in Pipe Heat Exchanger Design

When engineering a pipe in pipe heat exchanger, there are some factors to consider.

4.1 Inner Pipe

The inner pipe will usually serve as one of the process fluids tubes.

Both the outer pipe diameter and length will affect velocity and pressure drop.

Therefore, engineers should take caution when choosing this dimension.

4.2 Outer Pipe

The outer pipe acts as the second passage for the other process fluid.

Thus, it must have enough space to allow for the second fluid to flow.

Therefore, engineers will need to calculate the annular space to determine sizes.

4.3 Heat Transfer Surface

The inner pipe’s outer surface acts as the heat transfer surface.

Therefore, a longer pipe will provide a greater heat transfer surface area.

However, a long pipe will cause a high-pressure drop as well.

As such, there is a balance that must be met for both requirements.

4.4 Flow Arrangement

Because counterflow offers better thermal performance, it’s common to use it.

Therefore, when engineering the exchanger, it’s typical to use counterflow.

Parallel flow can be used when it benefits the process.

5. Pipe in Pipe Heat Exchanger Manufacturing Process

The requirements for manufacturing pipe in pipe heat exchangers will vary.

5.1 Material Selection

The first step to manufacturing any heat exchanger is material selection.

Factors to consider include:

• Temperature

• Pressure

• Corrosion

• Fluid Compatibility

• Força

As such, material choice will dictate how long the exchanger lasts.

5.2 Inner Pipe Preparation

The inner pipe is cut to size according to specifications.

Then the inner pipe is cleaned and inspected for defects or damages.

Therefore, the inner pipe is ready to be assembled to the rest of the exchanger.

5.3 Outer Pipe Preparation

Next, the outer pipe must be prepared to size.

As mentioned before, the outer pipe must allow room for the other fluid to flow.

As a result, proper dimensions are key to properly designing the exchanger.

5.4 Pipe Assembly

The inner pipe is then fitted into the outer pipe.

Support brackets are used to ensure the inner pipe stays in place.

Therefore, allowing for even flow distribution around the inner pipe.

5.5 End Connection Assembly

Next, we need to connect the ends of both inner and outer tubes.

These connections can be made in many ways, such as:

• Flanges

• Threaded connections

• Welded connections

• Custom connections

As such, connections should be made that can withstand the process.

5.6 Pressure and Leak Testing

Finally, we need to test the heat exchanger to ensure safety and reliability.

Testing can include:

• Hydrostatic testing

• Leak testing

• Pressure testing

• Dimensional inspection

Therefore, properly testing can give quality assurance to the customer.

6. Main Advantages of Pipe in Pipe Heat Exchangers

There are many advantages of using pipe in pipe heat exchangers.

6.1 Simple Construction

Pipe in pipe heat exchangers don’t use complicated designs.

Since there are only two fluid paths, manufacturing and customization is quick and easy.

6.2 Easy Maintenance

Since the exchanger has a simple design.

Maintenance can become more straightforward than complex heat exchangers.

6.3 Flexible Configuration

Pipe in pipe heat exchangers can be easily modified by changing:

• Pipe diameters

• Pipe lengths

• Materiais

• Flow arrangement

• Number of pipes in series

As such, pipe in pipe heat exchangers can be altered to fit many different processes.

6.4 Good Pressure Capability

Since the heat exchanger is made from pipes.

It can withstand large pressures due to pipe’s mechanical strength.

Pipe in pipe heat exchangers are capable of withstanding high-pressure situations.

However, engineers must choose the correct thickness and material.

6.5 Suitable for Viscous Fluids

Since pipe in pipe heat exchangers don’t use complex flow passes.

These exchangers work with viscous fluids. Such as oils, syrups, and more.

6.6 Easy Capacity Expansion

Customers can purchase more heat exchanger sections and connect them.

They can connect them in series or parallel to other sections.

As a result, customers can expand on heat transfer capacities.

7. Pipe in Pipe Heat Exchanger Applications

Pipe in pipe heat exchangers can be used for many applications.

7.1 Chemical Processing

As fábricas de produtos químicos utilizam pipe in pipe heat exchangers for:

• Heating chemicals

• Cooling chemicals

• Controlling product temperature

• Heat exchanging

7.2 Oil and Gas

Oil and gas plants need reliable heat exchangers to:

• Cool oil

• Heat gas

• Heat fuel

• CoolProcess fluids

7.3 Food Processing

Food processing requires controlled heating and cooling during processing.

Plant can use pipe in pipe heat exchangers for any sanitary applications.

However, manufacturers must ensure the materials and connections are sanitary.

7.4 Sistemas de climatização

HVAC systems need efficient heat transfer to control the temperature of fluids.

Assim, pipe in pipe heat exchangers can be used for custom heating or cooling.

7.5 Arrefecimento de processos industriais

Machines and equipment give off a lot of heat during operation.

As a result, pipe in pipe heat exchangers can cool process fluids by:

• Cooling hydraulic oil

• Cooling lubricants

• Water cooling

• Cooling process liquids

8. Pipe in Pipe vs Shell and Tube Heat Exchangers

Both pipe in pipe heat exchangers and shell and tube heat exchangers can transfer heat for industrial processes.

However, their designs are different.

Pipe in pipe heat exchangers are best for less complicated heat transfer responsibilities.

Shell and tube heat exchangers are best for industrial sized applications.

Trocador de calor de casco e tubo

9. Pipe in Pipe vs Double Pipe Heat Exchangers

The terms pipe in pipe heat exchanger and double pipe heat exchanger can refer to the same device.

Both use one pipe placed inside of another pipe.

Although some manufacturers may refer to these heat exchangers by different names based on industry and specifics of configuration.

A double pipe heat exchanger can include:

• One inner pipe
• One outer pipe
• Counterflow or parallelflow
• Multiple sections connected together

Pipe in pipe heat exchangers are one of the simplest forms of double pipe heat exchangers.

10. How to Select Pipe in Pipe Heat Exchangers

Here is some of the things to consider when selecting pipe in pipe heat exchangers.

10.1 Heat Duty

First, you will want to know how much heat needs to be transferred.

Heat duty dictates the length and diameter of the pipes. Thus, you will need to calculate the heat duty accurately.

10.2 Fluid Properties

Next, you should consider what fluids will run through the heat exchanger.

You will need to know these properties:

• Density
• Viscosity
• Specific heat
• Thermal conductivity
• Corrosiveness

Since these factors impact heat exchanger design, fluid properties are very important to consider.

10.3 Operating Temperature

Know the temperatures going into and out of the heat exchanger.

After that, find the temperature difference needed.

Once you have done this, you can select a flow arrangement that works.

10.4 Operating Pressure

Remember that the pressure inside the pipes must be accounted for.

As such, you will want to choose the proper wall thickness and material to sustain the desired pressure.

10.5 Pressure Drop

Last but not least, consider the pressure drop.

Pressure drop can cause pumps and compressors to use more energy.

Thus, it is ideal to design pipe diameter and velocity to minimize pressure drop.

10.6 Material Selection

Choose a material that can handle the operating temperature and contact with the fluids.

Three common choices include:

Stainless steel- works with many corrosive fluids

Carbon steel- cheap option if fluids are not too corrosive

Copper- ideal when high thermal conductivity is important

11. Por que escolher a Bangwin Thermal

Bangwin Thermal offers custom industrial heat exchangers made to your specifications.

We are capable of producing many types of heat exchangers, such as:

• Pipe in pipe heat exchangers
• Shell and tube heat exchangers
• Permutadores de calor de placas
• Finned tube heat exchangers.
• Permutadores de calor arrefecidos a ar
• Permutadores de calor industriais personalizados

Not only can we make you various heat exchanger styles, but our team of engineers can evaluate your project.

We take into consideration:

• Heat duty
• Temperature
• Pressure
• Fluid properties
• Material
• Flow arrangement
• Installation requirements

Because of this, our customers end up with heat exchanger solutions that are designed around their specific process.

For quality industrial heat exchangers:

Bangwin Térmica

For more industrial products:

Cilindro de gás Bangwin

12. FAQ

1. What are pipe in pipe heat exchangers?

Pipe in pipe heat exchangers use one pipe inside another pipe.

Therefore, two separate fluids can exchange heat through the inner pipe wall.

2. What is another name for a pipe in pipe heat exchanger?

Many engineers use the term double pipe heat exchanger for the same basic design.

3. Are pipe in pipe heat exchangers efficient?

Yes.

Counterflow operation can provide effective heat transfer.

However, performance depends on fluid properties, flow rate, temperature difference, and pipe dimensions.

4. What fluids can pipe in pipe heat exchangers handle?

They can handle many liquids and gases.

However, the material must match the fluid properties.

5. Are pipe in pipe heat exchangers suitable for high pressure?

They can support high-pressure applications with suitable materials and wall thickness.

Therefore, engineers must design the pipes according to pressure requirements.

6. What is the difference between pipe in pipe and shell and tube?

Pipe in pipe designs use two concentric pipes.

Shell and tube designs use multiple tubes inside a larger shell.

Therefore, shell and tube heat exchangers generally support larger heat duties.

7. Can pipe in pipe heat exchangers use counterflow?

Yes.

Counterflow remains a common configuration because it can improve thermal effectiveness.

8. Can Bangwin Thermal customize pipe in pipe heat exchangers?

Yes.

Bangwin Thermal can customize materials, dimensions, flow arrangements, connections, and thermal capacity.

13. Conclusão

Pipe in Pipe Heat Exchangers use two pipes to create thermal exchange between two fluids.

They achieve this by having one pipe inside of another pipe.

Not only are pipe in pipe heat exchangers simple, but they are also very versatile.

Consequently, this makes them ideal for small and moderate heat transfer applications.

These heat exchangers can be used for chemical processing, oil and gas, food processing, HVAC, industrial cooling, and more.

Just remember to properly design the heat exchanger according to heat duty, fluid properties, pressure, temperature, material, and pressure drop.

If you’re looking for custom industrial heat exchangers, look no further than Bangwin Thermal.

Bangwin Thermal provides engineering know-how with professional manufacturing competence.

Bangwin Térmica