Microchannel Water Coils

  • MICROCHANNEL WATER COILS

    Brazed aluminium microchannel heat exchangers for air-to-water, cooling and heating applications

    Microchannel heat exchanger

WATER COILS FOR COOLING AND HEATING

Microchannel heat exchangers can be configured for single-phase air-to-fluid heat transfer applications, efficiently cooling or heating various media, including water, glycol mixtures, oils, and specialized fluids.

Fluid coils inherit all the advantages of microchannel coil technology, including high heat transfer rates, an improved capacity-to-size ratio, reduced fan power consumption, and lower overall weight. Additionally, microchannel water coils provide outstanding corrosion resistance, ensuring a longer service life.

Kaltra’s microchannel water coils stand out for their exceptional performance—thanks to the optimized geometry of tube ports—and robustness, achieved through increased wall thickness and advanced protective coatings applied to both the outer and inner coil surfaces. Customers can choose from designs featuring either vertical or horizontal tube arrangements.

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Microchannel air-to-water coil

DESIGN AND STRUCTURE

The fluid coil core is an all-aluminum construction, assembled for brazing in a controlled-atmosphere furnace from the following components:

  1. Tubes with standard or enlarged ports. Fins, louvered or flat
  2. Inlet/outlet manifolds
  3. Reinforcement beams
  4. Fluid inlet/outlet connections
  5. Manifold-side mountings with vibration/corrosion isolators
  6. Side support fixtures

ADVANTAGES AND BENEFITS

Microchannel water coils offer significant advantages over traditional finned-tube coils in several key areas, including superior heat transfer efficiency, enhanced corrosion resistance, lighter weight, and lower pressure drops on both the air and fluid sides.

HIGHER HEAT TRANSFER

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RTPF

Since the heat transfer coefficient for single-phase flows depends on the hydraulic diameter of the flow area, microchannel water coils—with their millimeter-scale ports—offer significantly higher heat transfer rates compared to finned-tube heat exchangers.

LOWER AIR RESISTANCE

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RTPF

The microchannel water coil, being four times thinner than a finned-tube heat exchanger of equivalent duty, ensures significantly lower air resistance, while the CFD-optimized fin geometry further minimizes pressure drop on the airside, resulting in lower fan power draw.

LONGER SERVICE LIFE

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RTPF

Protective coatings are available for both the outer and inner coil surfaces. For external treatment, options include e-coating, TCP coating, or a nanoscale trichrome film. The nanoscale trichrome film is available for inner surface treatment, ensuring compatibility with a broader pH range of the fluid.

LIGHTER WEIGHT

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The coil core is made of aluminum, ensuring a lighter weight than traditional finned-tube coils. Its reduced internal volume further contributes to weight savings in installations. Available fluid connections include aluminum, stainless steel, and copper options.

APPLICATIONS

Microchannel water coils seamlessly integrate into various HVAC systems, offering a superior alternative to traditional finned-tube heat exchangers while enhancing efficiency and performance. The most distinctive applications include:

  • Chilled water coils, e.g., in free cooling systems
  • Hot water coils for heating applications
  • Cooling and heating coils in process cooling and comfort air conditioning
  • Energy recovery and waste heat utilization
  • Dehumidification systems

MCHE selection software

SELECTION SOFTWARE

MCHE selection software offers a comprehensive solution for refrigeration professionals, covering condenser, evaporator, heat pump, and air-to-fluid coils. This all-in-one selection and calculation tool simplifies the design and optimization of microchannel heat exchangers for a wide range of applications.

With advanced capabilities, the software allows users to select and rate microchannel heat exchangers based on critical parameters such as application type, cooling capacity, refrigerant, evaporation and condensation temperatures, airflow, and air temperature. These detailed options ensure precise product selection and optimal system performance in refrigeration systems.

PRODUCT SPECIFICATIONS

Min/Max width [mm]

FROM 50 TO 6000

Min/Max height [mm]

FROM 50 TO 2000

Design

HORIZONTAL/VERTICAL TUBE ARRANGEMENT • SINGLE-/MULTI-PASS • SINGLE-/MULTI-CIRCUIT

Tube width [mm]

12.0 • 16.0 • 20.0 • 25.4 • 28.0 • 32.0 • 36.0

Tube spacing [mm]

7.8 • 9.3 • 9.4 • 9.8 • 10.0

Manifold diameter [mm]

16 • 20 • 25 • 30 • 32 • 38 • 42 • 50

Fin type

FLAT • LOUVERED

Fin pitch [FPI]

10.0 • 12.7 • 16.5 • 17.0 • 18.0 • 19.5 • 21.0 • 23.0 • 24.0 • BY REQUEST

Tube material(s)

AA3102 • HA9153A • AA3F03 • AA3F05 (TEMPER H112) ZINC ARC SPRAY

Fin material(s)

AA4343 • AA3003 • FA7971 (TEMPER H14)

Manifold material(s)

AA4343 • AA3003 OR AA4045 • AA3003/AA4045 • AA3005 (TEMPER H14)

Design pressure [bar]

10 • 20

Refrigerant

WATER • GLYCOLS • OILS • SPECIAL FLUIDS

Protective coating

E-COATING • TCP-COATING • NANO-COATING (EXTERNAL/INTERNAL) • UV-PROTECTION

Special coating

HYDROPHILIC • HYDROPHOBIC • PAINT

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