Knowledge base
In short
In industrial process cooling a plate heat exchanger takes heat out of a process liquid and hands it to a separate cooling circuit. The two liquids never mix, so the product stays clean and the cooling water stays protected. It is chosen where a plant needs steady temperatures in a compact, serviceable unit.
Almost every factory has something that must be kept cool. It may be oil in a hydraulic press, a solution in a reactor, a product on its way to the filling line or the water that cools a machine. The heat has to go somewhere, and in most plants it goes into a cooling circuit through a plate heat exchanger. This guide explains in plain words what is being cooled, why the process and the cooling circuit are kept apart and what a buyer should have ready before asking for a unit.
What Gets Cooled In A Plant
Process cooling covers a wide range of duties. Machines and presses heat their oil, furnaces and welders heat their cooling water, compressors heat their lubricant and condensate, chemical and food processes release heat as products are made, and many plants need a product cooled before it can be stored or packed. The liquids differ from industry to industry, but the task is the same: remove heat steadily so that the process keeps running at the temperature it needs.
Too much heat shortens the life of oil and machinery, spoils products and slows production. Too little heat in the wrong place can be just as costly, which is why the temperature is controlled and not simply cooled as far as possible.
Why The Process Liquid Is Kept Apart
A plate heat exchanger lets two liquids pass heat between them without ever meeting. That separation is the main reason it is used. The process liquid may be valuable, sticky, aggressive or subject to hygiene rules, and the cooling water may be treated, dirty, cold or shared with other machines. Keeping them apart protects the product from the cooling water and the cooling water from the product.
It also keeps responsibility clean. The process side has its own pumps, pressure and liquid, the utility side has its own, and a problem on one side does not travel to the other.
Where The Heat Goes Afterwards
The cooling circuit on the other side of the exchanger has to dump its heat somewhere. In many plants this is a dry cooler or radiator on the roof or in the yard, a cooling tower, a chiller or a river or sea water supply. The exchanger lets the plant use any of these without exposing the process to them. A closed circuit with an outdoor cooler is popular where water is scarce or where clean, treated circulating liquid is wanted.
Some plants go one step further and use the heat taken from the process to warm buildings, wash water or other processes. The same plate exchanger idea works in that direction too, and it can turn a cost into a saving.
Choosing A Unit For Process Duty
The right unit depends on the liquids, how clean they are, how often the process changes and whether the exchanger must be opened. A gasketed unit can be opened for cleaning and extended when the plant grows, which suits liquids that foul. A brazed or welded unit takes up less space and has fewer places to leak, which suits clean liquids and hard conditions. Materials follow the liquids, and the process owner usually knows best what the liquid will tolerate.
Since each process is different, the sensible way to start is a good description of the duty. TECS Engineering designs and delivers plate heat exchanger solutions for engine, power plant and industrial cooling circuits; send the process liquid, the heat to be removed, the cooling circuit available and the conditions on both sides, and the engineering team will answer.
In Short
- Takes heat out of a process liquid into a separate circuit
- Keeps the product and the cooling water from ever mixing
- Keeps temperatures steady for oil, product and machinery
- Works with a dry cooler, cooling tower, chiller or other source
- Gasketed where cleaning is expected, brazed or welded where it is not
- Recovered heat can warm buildings or other processes
What To Send With An Enquiry
- The process liquid and what the process is
- The heat to be removed and the temperatures wanted
- The cooling circuit available and its liquid
- Pressures on both sides and the allowed pressure drop
- How clean the liquids are and whether they foul
- Space available, site rules and any hygiene requirements
Questions We Are Often Asked
Why use a plate heat exchanger for process cooling?
It passes heat from the process liquid to a cooling circuit without mixing them, in a compact unit that is easy to service.
Why not cool the process directly with the cooling water?
Direct contact would put the product at risk and expose the process to dirt, scale and pressure from the cooling side. The exchanger keeps each side protected.
Where does the heat taken from the process end up?
In a dry cooler, cooling tower, chiller or other heat sink, or it can be reused to warm buildings, wash water or another process.
Gasketed, brazed or welded for a process?
Gasketed where the liquid fouls or the plant may grow, brazed or welded where the liquids are clean and space or tough conditions matter.
What should I send to get an offer?
The process liquid, the heat to be removed, the temperatures wanted, the cooling circuit available, the pressures and the space and site rules.
Contact Us
Send us the heat duty, the fluid temperatures and flow rates, the ambient conditions and the installation limits. We answer with a design proposal - or write to us on WhatsApp.
