Kaltra has released a new generation of microchannel condenser platforms designed to support HVAC manufacturers transitioning to low-global-warming-potential refrigerants, including R454B, R32, and R290. The condensers address the distinct thermodynamic and safety characteristics of each refrigerant through tailored heat exchanger geometry, material selection, and refrigerant distribution strategies.
The new designs focus on enhancing heat transfer, maintaining phase-stable refrigerant flow, and improving subcooling performance. According to Kaltra, OEMs using these condensers can benefit from higher coefficient of performance (COP), more stable condensing pressures under varying load conditions, and improved part-load performance, all without increasing system footprint or fan power consumption. These features are aimed at supporting compliance with evolving energy efficiency standards in chillers and heat pump systems.
For R32, the condensers feature a higher pressure-rated tube and manifold design. R454B systems benefit from phase-balanced refrigerant circuitry, while R290 applications utilize low internal volume configurations to minimize refrigerant charge in line with safety and regulatory standards.
Specifically for R290 systems, the microchannel condensers include significantly reduced internal volume, optimized vapor-liquid distribution, and compact manifold architecture. These design elements help OEMs meet refrigerant charge limits outlined in EN 378 and IEC 60335-2-40 while maintaining thermal performance.
To ensure durability in harsh environments, the condensers are manufactured with high-strength 3F05 aluminum alloy and an arc-sprayed zinc sacrificial layer. Optional corrosion protection coatings, including e-coating, are also available for coastal, industrial, or polluted settings, supporting longer service life and reduced maintenance.
All condenser parameters, including size, fin type, refrigerant circuitry, and connection layout, are fully customizable. Kaltra engineers work closely with OEMs to define capacity requirements, optimize performance, and integrate the condensers seamlessly into existing system architectures.