The main purpose of a heat exchanger is to efficiently transfer heat from one fluid (liquid or gas) to another without the fluids mixing, controlling temperatures for heating, cooling, or energy recovery in systems like HVAC, cars, power plants, and refrigerators, thereby improving efficiency and preventing overheating. It essentially moves thermal energy between mediums, such as hot engine coolant to air (radiator) or hot exhaust gas to fresh air (HVAC), says Aggreko and Wikipedia.
What is a heat exchanger used for ?
Heat exchangers are used to give control over the temperature in various processes to improve efficiency, prevent overheating or other potential hazards, and to improve safety.
For example, an oil cooler cools down hot oil by passing cold water next to the hot oil tube. The heat from the oil is transferred into the cold water, reducing the temperature of the oil.
Wherever heat is being generated in a process, heat exchangers can be used to keep the process safe, as well as use the heat energy most efficiently. As there are so many different places they can be used, there are a lot of different varieties.
If you don't understand any terms that we're using, refer to our heat exchanger glossary
How do heat exchangers work?
Heat exchangers work differently according to the specific type. They use a combination of conduction and convection to move energy, in the form of heat, from one location or flow to another. They generally operate in a sensible heat range and occasionally engage the stored capacity of state change, enthalpy.
This could mean heating one medium by conducting heat into it. Alternatively, it could be cooling something by transferring heat from it into another medium, such as air or water. The goal is to improve efficiency or safety of a process. Some processes wouldn't work at all without a heat exchanger.
Read how each of the common types of heat exchanger works below.
Common heat exchanger applications
Heat exchanger applications include power generation in power plants, heating and air con systems, refrigeration, manufacturing, food processing, chemical processing, car radiators and many others.
Heat exchangers are used in thousands of different places.
At home
Around the home, they're commonly found in central heating combi boilers and help to heat and cool down the water efficiently and safely. They're also found in your refrigerator, ensuring it stays at a stable, cool temperature.
Public Spaces
You're also likely to have benefited from heat exchangers in public places. Your local swimming pool would be much colder without a heat exchanger helping to keep the water warm.
Car engines produce a lot of heat and this needs to be managed effectively to prevent dangers. Cars often use a combination of fans and air flow, with fins to dissipate heat, and the use of a coolant fluid.
Industrial
Heat exchangers are also used widely in different industrial applications. This includes power generation, the manufacture and storage of food, chemical engineering, and even in the running of air and marine transport, for example.
Sterling TT works with a range of industries to provide specialist heat exchangers. Find out more about the markets we serve.
Defence
Even in the defence sector, we find heat exchangers. They are installed, for example, on the navy surface and auxiliary ships as well as on submarines. They cool nuclear submarine propulsion motors.
In addition to heat exchanger, GNEE also offers more high-quality products, such as volumetric heat exchangers, copper heat exchangers, titanium heat exchangers, heaters, chlorine coolers, high-pressure reactors, LPG storage tanks, cryogenic storage tanks, VPSA oxygen generators, etc. If you are interested in the above products or other products, please feel free to send an email to sales@gneeheatex.com, and our professional team will be happy to answer your questions.
Frequently Asked Questions
What is the primary function of a shell and tube heat exchanger?
A shell and tube heat exchanger enables efficient thermal energy transfer between two separate fluids, using a bundle of tubes enclosed within a cylindrical shell, without allowing the fluids to mix.
Which industries commonly use shell and tube heat exchangers?
Shell and tube heat exchangers are widely used in chemical processing, oil and gas, HVAC, power generation, food processing, and pharmaceutical industries due to their reliability and adaptability to diverse process requirements.
What design features enhance heat transfer efficiency in shell and tube heat exchangers?
Features such as multi-pass tube design, baffles, turbulent flow, enhanced tube surfaces, and optimized tube pitch are critical for boosting heat transfer rates and minimizing fouling.
How does tube material selection affect heat exchanger performance?
Tube materials like stainless steel, copper, titanium, and specialized alloys are chosen for their thermal conductivity, corrosion resistance, and suitability for operating pressures and fluid types, directly impacting efficiency and lifespan.
Why are shell and tube heat exchangers suitable for high-pressure or temperature applications?
Their robust construction, compliance with TEMA and ASME codes, and inclusion of expansion joints allow them to withstand extreme temperature differentials and high operating pressures reliably.
What factors should be considered when selecting a shell and tube heat exchanger for a local manufacturing facility?
Assess thermal design, pressure and temperature ratings, material compatibility, maintenance needs, and compliance with industry standards specific to your process and regional regulatory requirements.