NEO MAKİNA ve MÜHENDİSLİK A.Ş. manufactures industrial coil-tube (serpentine) heat exchanger systems that use steam, hot water or heating circuits as the primary source. A compact, durable and easily maintained heat-transfer solution for high-capacity domestic hot water and process heating in hotels, hospitals, dormitories, housing estates and industrial plants.
What Is a Coil-Tube Heat Exchanger?
In a coil-tube exchanger the primary fluid (steam or hot water) flows through a helical or U-tube bundle while the secondary fluid (domestic or process water) is heated on the shell side. The two circuits never mix; primary pressure and chemistry are kept separate from the secondary side.
Design and Flow Characteristics
- Counter-current design: Hot and cold fluids flow in opposite directions; the temperature difference (ΔT) is maintained along the whole surface for maximum LMTD and efficiency.
- Turbulent flow: Tube velocity and coil geometry create turbulence that raises the overall heat-transfer coefficient (U) and reduces fouling.
- Pressure rating: Designed for static pressure and fluctuations in high-rise buildings; typical design pressure 10–16 bar, up to 25 bar on request.
- Thermal expansion: U-type or free-end coils prevent stress build-up.
Material Options
- Shell: St 37 / P265GH carbon steel; AISI 304/316L stainless steel for aggressive fluids.
- Coil tubes: Copper (TS 8324 / EN 12451) for high conductivity, steel (TS EN 10217-1) or stainless steel for industrial duty.
- Corrosion protection: Full stainless, hot-dip galvanised or epoxy-coated options; anode and insulation jacket optional.
Applications
- Central domestic hot water from steam or hot water in hotels, hospitals, dormitories and housing estates.
- Integration of solar collector and boiler circuits with cylinders and storage tanks.
- Process water, washing lines and pool heating in industry; condensate cooling and heat recovery.
Typical Application Range
- Thermal capacity: 50 kW – 5,000 kW
- Primary fluid: 0.5–10 bar saturated steam, 90–180 °C hot water, thermal oil
- Design pressure / temperature: 10–25 bar / up to 200 °C
- Standards: PED 2014/68/EU, EN 13445 or ASME VIII Div.1, TEMA principles; CE
Advantages and Points to Consider
- Advantage: Small footprint; flexible integration with steam, boiler and solar systems; higher pressure and dirty-fluid tolerance than plate exchangers; removable coil for cleaning.
- Consider: Hard water requires periodic descaling or softening; copper for clean water, stainless steel for aggressive fluids.
The NEO MAKİNA Difference
Exchangers are sized by thermal calculation from flow rate, inlet/outlet temperatures, fouling factor and pressure-drop limits. They can be delivered as complete hot-water preparation groups with cylinder, expansion, circulation and control valves. Installation, commissioning and maintenance support are provided.
Frequently Asked Questions
Coil-tube or plate heat exchanger?
For steam heating, high pressure, dirty or scaling fluids, the coil-tube exchanger is more robust. For clean water-to-water duty in tight spaces, a plate exchanger may be more compact.
What capacity do I need?
Calculated from peak hot-water flow (L/min), inlet/outlet temperatures and primary-source temperature; a diversity factor is applied for hotels and dormitories.
How often is maintenance needed?
Coil inspection and chemical/mechanical cleaning every 6–12 months depending on water hardness.
To size the right heat exchanger for your plant and request a quotation, contact us.