GlobalSpec has asked its users about the latest design trends and features related to Heat Exchangers. They have also shared their product applications and tips on how to buy and use these products.
See the entire survey


Q:
Do you have any advice for people relative to buying or using heat exchangers?
51 answers
Answers:

Make sure the design is right before rushing into purchasing the equipment. Have a competent design engineer either design the exchanger or check the design coming back from the manufacturer before it is built to avoid unseen cost further down the road in manufacturing and operational costs. Heat exchangers are highly optimizable in how they handle duty, designed to minimize fouling and operational costs (ie water).

~GlobalSpec Registered User

First well definition of all operations conditions (minimum. normal and maximum) and abnormal conditions. Second choose the type (shell and tube, plate,..) Specify the correct materials, Check the design, Test the equipment. If using water to cool, never allow the work temperature over 40 ºC. Pay attention about control system. If the tube fails, pay attention to other equipment connected.

~GlobalSpec Registered User

Fittings can have a large impact on heat exchanger pressure drop. Flow configuration (cross, counter, cross-counter, parallel) as well as flow type (mixed or unmixed) can be important depending on the effectiveness requirements.

~GlobalSpec Registered User

If a close temperature approach is needed, utilize a plate type heat exchanger. Engineers, DO NOT design in additional surface area; it reduces the flow velocity through a plate type heat exchanger and decreases its efficiency.

~GlobalSpec Registered User

Before Hexs are bought, one should be able to know exactly what use he needs from the exchanger. Enquire to find out reputable companies that have long standing integrity in this business.

~GlobalSpec Registered User

Do the maintenance properly & regularly as needed for efficient & safe working condition, do not use asbestos gasket which causes harmful effects for human health.

~GlobalSpec Registered User

Automotive AC and HVAC/R are two distinct industries and they do not overlap. Trying to get automotive rugged HE's from non automotive suppliers is fruitless.

~GlobalSpec Registered User
Limit water velocities to less than 1.4 metres per second to avoid erosion corrosion. Limit all temperature differences to less than 60C, whenever possible.
~GlobalSpec Registered User
Look "out of the box" at your operating parameters when discussing applications with vendors to determine the cost driving forces in the selection process.
~GlobalSpec Registered User
Check carefully solution, dimensions of quoted units and consider carefully solution. Competition is hard and some companies are optimizing solutions.
~GlobalSpec Registered User
Select the right type for the specific application and take note of any recent changes to the specifications/guidelines for design and manufacture.
~GlobalSpec Registered User
Heat Exchanger design shall be suitable for internal cleaning and repair when required. Mechanical design shall consider for thermal transients.
~GlobalSpec Registered User
Its need a primary estimation to select and buy or using heat exchanger .... really i check every advice i can get before i buy or select ....
~GlobalSpec Registered User
Watch out for corrosive and/or dirty fluids & related fouling, which will degrade performance over time. They will also cut the life short.
~GlobalSpec Registered User
If you have condensibles or particulates in your air stream, pay careful attention to how easy it will be to maintain the heat exchanger.
~GlobalSpec Registered User

Remember that BAHE are not made in Steel, so they are incredibly weak spot in high pressure process plant, LNG recovery & fractionation.

~GlobalSpec Registered User

I advise to use plate heat exchangers with: -maximum reliability; -low cost; -precision heat transfer -minimum energy consumption

~GlobalSpec Registered User

1. Use good strainers in the line to minimise the impurities 2. Use intermediate HE when we opt for higher temperature differential

~GlobalSpec Registered User
Do not overlook the amount of oil flowing through the cooler. The biggest unit in the world is useless without sufficient oil flow.
~GlobalSpec Registered User
Select them correctly for your application. Try to make your own calculations. Don´t rely solely what the manufacturer suggests
~GlobalSpec Registered User

1. ONE SHOULD LOOK FOR LMTD AND THERMAL EFFICIENCY 2. COST 3. CORROSION RESISTANT MATERIALS FOR THE HEAT EXCHANGERS

~GlobalSpec Registered User
Check all information that exchangers builder provide: select correct temperature and flow rate for application.
~GlobalSpec Registered User
Check users list Check welders certifications Check for a quality assurance procedure and ISO certification
~GlobalSpec Registered User

Plate heat exchangers are growing in the market, and can be a very useful choice in energy savings.

~GlobalSpec Registered User
Get the manufacturer to size the HX, they have all the empirical data for the HX performance.
~GlobalSpec Registered User
Understand what they do and how they can save dollars and energy in the right circumstances.
~GlobalSpec Registered User

Check if the company can do their own thermal design, and if they offer you alternatives.

~GlobalSpec Registered User
Check for spares support before going out and purchasing the latest technology.
~GlobalSpec Registered User
If you buy any heat exchanger make sure that it is compatible for your system.
~GlobalSpec Registered User
When you need a plate heat exchanger, or have a problem with one, contact us.
~GlobalSpec Registered User
Consider the types, its performance rating and life of your heat exchanger.
~GlobalSpec Registered User
Purchase heat exchangers with the most biggest surface area available.
~GlobalSpec Registered User
Make sure the energy transfer-surface area ratio is reasonable.
~GlobalSpec Registered User
Make sure you are sized right and have proper flow rates.
~GlobalSpec Registered User
Find a Supplier who knows what they are talking about.
~GlobalSpec Registered User

Do not believe all the suppliers on their "blue eyes"

~GlobalSpec Registered User
Review submittal detail to verify heat transfer BTU.
~GlobalSpec Registered User
Reliability,proven performance, track record of co.
~GlobalSpec Registered User
Keep a close eye on quality of product supplied.
~GlobalSpec Registered User
Know your plants electrical/steam or ?? capacity.
~GlobalSpec Registered User
Make sure materials compatible with application.
~GlobalSpec Registered User

Have a RS Requirement Specification for product

~GlobalSpec Registered User
1. Requirement should be specified correctly.
~GlobalSpec Registered User
Seek efficiency and low maintenance.
~GlobalSpec Registered User
Go larger than you think you need.
~GlobalSpec Registered User
Don't buy cheap control systems.
~GlobalSpec Registered User

Thoroughly understand metallurgy.

~GlobalSpec Registered User
Model brand performance
~GlobalSpec Registered User
Don't buy on price alone!
~GlobalSpec Registered User
Maintenance is important.
~GlobalSpec Registered User
Buy only non corrosive.
~GlobalSpec Registered User

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