Heat Exchanger

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What is Heat Exchanger?

Heat exchanger is a component that transfers heat energy using fluid such as a liquid or gas. It adjusts temperature of hydraulic fluid or lube oil to improve working efficiency of system and prevent oil deterioration.
It is an indispensable component for automobiles and industrial equipment such as radiators, oil coolers, charge air coolers, and EGR coolers.
We offer various types of heat exchangers that can be divided two types roughly.


Heat Exchanger Line-up

Shell & Tube type Heat Exchanger


Low-temperature fluid flowing inside of small tubes cools high-temperature fluid flowing outside of small tubes in a shell.


Air-Cooled type Heat Exchanger


Air from fan motor cools radiator that high-temperature fluid flows.


Structure of Heat Exchanger

Basic structure of Shell & Tube type Heat Exchanger

Fixed tube sheet type (2 PASS)


Floating tube sheet type (2 PASS)


TAISEI Low Fin Tube

What is Low Fin Tube?

Low fin tube is a cooling tube with rolling processed threads.
Because of its high heat transfer coefficient, high performance, and downsizing, Low Fin tube has been chosen for various heat exchangers in power plants, refinery plant, cooling facilities, and so on.

  • In-house Fin Processing

    Low fin threads are processed by own-developed rolling machine.

  • Smallest Diameter 9mm

    Tube minimization enables increase of heat transfer coefficient and high performance. More number of cooling tubes can be installed in a body and enables larger heat transfer area.

  • 28 Fin threads/inch

    Larger number of fin threads are processed comparing to general fin tube.
    This enables larger heat transfer area.

  • Various Tube Material

    Various material and tube diameter are available.

Stainless-steel (φ12.7)
Carbon steel for boiler/heat exchanger (φ12.7)
Cupronickel (φ12.7)
Aluminum brass (φ12.7)
Phosphorous-deoxidized copper (φ12.7)
Phosphorous-deoxidized copper (φ9)

Water Quality Standard for Heat Exchanger

Refer to the following water quality standard for cooling water of heat exchanger.

  item Cooling water standard value Tendency
Corrosion Scale adhesion
Criteria item pH [25℃] 6.5~8.2
Electrical conductivity[25℃](ms/m) 80Less than
Chloride ion(mgCl-/L) 200Less than  
Sulfate ion(mgSO4-2/L) 200Less than  
Acid consumption [pH4.8](mgCaCo3/L) 100Less than  
Total hardness (mgCaCo3/L) 200Less than  
Calcium hardness (mgCaCo3/L) 150Less than  
Ionic silica (mgSiO2/L) 50Less than  
Ref items Total iron (mgFe/L) 1.0Less than
Total copper (mgCu/L) 0.3Less than  
Sulfide ion (mgS2-/L) Not detected  
Ammonium ion (mgNH4+/L) 1.0Less than  
Residual chlorine(mgCl/L) 0.3Less than  
Free carbon dioxide (mgCO2/L) 4.0Less than  
RSI (Ryznar Stability Index) 6.0~7.0
By Standard of the Japan Refrigeration and Air Conditioning Industry Association (JRA-GL-02-1994)
Tap water, underground water, and industrial water are generally used as cooling water.
In case od using untreated water from river, lake, and pond, please be careful of pollution and contamination.
Since the standard value in the table is reference values determined for longer service life and efficiency retention of heat exchanger, corrosion and scale adhesion may cause even if each value is within the standard value.