Kaltra - Microchannel Condensers
Microchannel condensers are the most efficient air-to-refrigerant heat exchangers, offering heat transfer rates several times higher than those of traditional finned-tube coils. Their high efficiency, combined with other advantages—such as low airside pressure drops, reduced refrigerant charge, lighter weight, and smaller face areas—makes microchannel condensers an indisputable choice for modern HVAC and refrigeration systems.
Kaltra’s microchannel condenser range features models with horizontally or vertically oriented multiport tubes in single or multiple pass designs, compatible with various refrigerants. Customers can choose from a diverse range of dimensions and customize condenser coils by combining multiport tube widths with various fin types and pitches, as well as select the appropriate connections, mountings, and protective coatings to meet specific application requirements.
Besides their exceptional thermal efficiency, our microchannel condensers—engineered with advanced aluminum alloys and state-of-the-art protective coatings—offer outstanding corrosion resistance, proven through extensive field experience. We stand by their durability and reliability by providing the best warranty terms available on the market.
Advanced microchannel condenser technology is ideal for a wide range of HVAC systems, including air-cooled chillers, air-source heat pumps, condensers, and rooftop units, offering unparalleled efficiency and reliability.
Kaltra’s microchannel heat exchangers offer exceptional corrosion resistance, achieved through the use of long-life aluminum alloys such as AA3F03 and AA3F05. These materials, combined with a zinc arc-sprayed sacrificial layer and optional protective coatings—including electrophoretic epoxy (e-coating), trivalent chromium (TCP) coating, and an advanced nanoscale trichrome coating—ensure long-lasting performance in demanding environments. They are specifically designed to withstand high air salinity in coastal areas (corrosivity category C5-M) and severe pollution in industrial or urban settings (corrosivity category C5-I).
Numerous SWAAT ASTM G-85 Annex A3 tests, in which specimens were exposed to a continuous spray of acidified water solutions under high humidity and temperature for up to 6000 hours, have demonstrated exceptional corrosion resistance.
Environmental safety, one of Kaltra’s core principles, is integrated into the design of our microchannel condensers, ensuring eco-friendly solutions that adhere to sustainability standards. A wide nomenclature of multi-port tubes, including options as small as 12mm, along with various available fin pitches, manifold configurations, and flexible flow arrangements, enables the design of microchannel condensers with minimal internal volume. This, in turn, allows for the development of HVAC systems with the lowest possible refrigerant charge.
The compatibility of condensers with flammable and/or toxic refrigerants, including natural ones like propane or ammonia, enables the design of eco-friendly, low-GWP systems while ensuring compliance with regulatory requirements for refrigerant charges.
The patented design of microchannel condensers, featuring a vertical multi-port tube arrangement and an integrated refrigerant receiver, provides significant benefits for part-load operation—making it especially advantageous for modern variable-speed systems—and ensures efficient oil return. The lower (outlet) manifold acts as a refrigerant receiver, accumulating and holding liquid refrigerant to optimize system charge. Furthermore, the outlet baffle effectively prevents gaseous refrigerant from entering the low-pressure side of the system.
The vertical tube arrangement features a single-pass design, ensuring a low refrigerant-side pressure drop and contributing to improved overall system efficiency.
Microchannel condensers offer substantial benefits compared to traditional finned tube designs, delivering significant improvements in HVAC system performance:
- Enhanced efficiency: Achieve up to 40% higher heat transfer efficiency
- Lower airside pressure drops: Enhances overall system performance
- Closer approach temperatures: Results in higher heat transfer
- Compact design: Coils feature up to 20% smaller face areas
- Lightweight construction: Save up to 50% on coil weight
- Reduced refrigerant charge: Cut refrigerant needs by 40% to 60%
- Width 80-4800mm
- Height 80-2000mm
- Tube width 32mm/48mm
- Fin type Louvered
- Fin pitch 24FPI
- Design pressure 45 bar
- Refrigerants HFC/HFO/Natural
- Protective coatings E-coating
- 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] : 32 • 45
- Refrigerant : HFC • HFO • NATURAL
- Protective coating : E-COATING • TCP-COATING • NANO-COATING • UV-PROTECTION
- Special coating : HYDROPHILIC • HYDROPHOBIC • PAINT