In water and oil-based temperature control systems, the heat exchanger is the core component responsible for transferring energy efficiently, balancing system temperature, protecting equipment, and supporting tight process tolerances.
Common Heat Exchanger Types & Where They Work Best
- Shell & Tube Heat Exchangers
- Design: A bundle of tubes inside a larger shell, with one fluid inside the tubes and the other in the shell
- Variants:
- U-tube: Compact design, allows thermal expansion
- Straight-tube with removable heads: Easier cleaning, ideal for fouling-prone fluids
- Floating head: Accommodates high thermal stresses, suited for oil systems
- Best for: High-pressure or high-temperature oil systems, harsh fluids, or larger systems with continuous duty cycles
- Plate Heat Exchangers (PHEs)
- Design: Stacked, corrugated plates create narrow flow paths for heat transfer
- Types:
- Gasketed: Easy to clean and expand
- Brazed: Compact, sealed units for closed-loop systems
- Welded or semi-welded: Handle higher pressures or aggressive fluids
- Best for: Water temperature control units with clean fluids and tight temperature setpoints
- Advantage: High efficiency in compact footprint; rapid response to temperature changes
Common Heat Exchanger Problems & Mitigation Tips
- Fouling and Scale Build-Up
- Cause: Hard water, oil degradation, or particulate contamination
- Tip: Use filtered fluids; perform regular flushing and chemical cleaning
- Cross-Contamination Between Fluids
- Cause: Internal leaks from cracked tubes or worn gaskets
- Tip: Monitor for pressure imbalance and fluid discoloration; test fluid samples regularly
- Reduced Heat Transfer Efficiency
- Cause: Insulation from scale, corrosion, or trapped air
- Tip: Bleed air from systems; inspect heat transfer surfaces; maintain correct flow direction
- Gasket Failure (Plate Type)
- Cause: Over-tightening, thermal cycling, or chemical incompatibility
- Tip: Use OEM gaskets; avoid overtightening; match material to system fluid and temperature
Routine Maintenance Practices
- Clean plate or tube bundles based on fluid condition and fouling tendency
- Inspect gaskets for brittleness or compression fatigue (especially in high-temp oil units)
- Check pressure drops and inlet/outlet temperatures to identify early loss of performance
- Drain and inspect for signs of fluid cross-over, especially when systems are shut down
- Use treated water and filtered oil to extend heat exchanger life and reduce scaling
Why System-Engineered Heat Exchangers Outperform One-Size-Fits-All Replacements
- Temperature control systems are engineered with precise flow rates, thermal loads, and fluid compatibility in mind
- Substituting a heat exchanger with a similar-looking model may create flow imbalance, pressure loss, or thermal lag
- The original system designer selects materials (e.g. 316 SS, carbon steel, copper, or titanium), gasket types, and flow configurations for optimal reliability
- Working with the system integrator ensures sizing, expansion allowances, and cleaning procedures are all properly matched
From tight-tolerance molding to precision extrusion to food/beverage manufacturing, a well-matched and well-maintained heat exchanger makes the difference. Share your lessons learned or approaches for keeping yours running clean and efficient.
Need reliable heat exchanger replacements on hand when it counts?
Take advantage of our limited-time discount on heat exchangers, available throughout June to August. Reach out to an ACS Group representative to claim your offer!