Heat Exchangers
Equipment for the efficient transfer of heat between fluids, designed to suit each process.
Benefits
- High thermal efficiency.
- Options: plates, tube and shell, dimpled jackets.
- Manufacturing under TEMA standards.
- Sanitary finish available for the food and pharmaceutical industries.
Functionality / Applications
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Pasteurization.
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Rapid heating or cooling.
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Energy recovery.
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Thermal control of reactors or kettles.
Types of heat exchangers
1. According to the contact between fluids
a) Direct
- The fluids mix.
- High thermal efficiency and compact design.
- They are used only when the mixture does not cause problems.
Example: cooling towers.
b) Indirect
- The fluids do not mix; they are separated by a metallic surface.
- They prevent contamination and allow for greater control.
- The most commonly used in the industry.
2. According to the direction of the flow
a) Parallel
- Both fluids circulate in the same direction.
- Lower efficiency.
b) Counterflow
- They flow in opposite directions.
- The most efficient:allows for a greater temperature difference.
c) Crossed
- Perpendicular flows.
- Useful when one of the fluids changes phase.
- It can be “mixed” or “unmixed”.
d) Combined
- A fluid flows in both parallel and countercurrent directions at the same time.
- Increases heat transfer.
3. According to the number of steps
a) Simple step
- A single heat exchanger.
- It can be complemented with several units in series.
b) Multiple steps
- Several stages of exchange within the same team.
- They increase efficiency and reduce space, common in "U" tubes.
4. According to its structural design
a) Plates
- Metal plates stacked to form channels.
- High efficiency, compact and easy to clean.
- Used in food, pharmaceuticals and air conditioning.
b) Casing and tubes
- Tubes inside a cylindrical casing.
- Resistant to high pressures and temperatures.
- Common in chemistry, petrochemicals, and energy.
c) Air-cooled
- They use ambient air for cooling.
- They incorporate fins to increase surface area.
- Used in automotive and industrial refrigeration.
d) Concentric tubes
- One tube inside another.
- Simple, economical and for small flow rates.