Kaltra unveils reversible microchannel coils – engineered for modern heat pumps

ALTMUNSTER, Austria - Rezul -- Uniform refrigerant distribution and effective condensate drainage have long been among the main engineering challenges in microchannel evaporator design. While Kaltra's previous coil generations successfully solved these aspects individually, certain demanding conditions — such as low-load operation, frosting, or use in reversible heat-pump systems — continued to push design limits.

Driven by the goal of achieving flawless performance under all operating scenarios, Kaltra's R&D team has taken the technology a step further. The result is a new, revolutionary generation of microchannel evaporator coils that ensure stable operation under the most challenging thermal conditions and enable full reversibility as condenser coils in heat-pump applications.

The breakthrough comes with a configuration that places the microchannel tubes horizontally — a layout traditionally avoided in evaporator designs due to poor condensate drainage. Kaltra's engineers overcame this limitation by replacing individual folded fin stripes with vertical louver-fin plates with leading edges. These edges, which maintain a higher surface temperature than the flat tube, slow the cooling process and direct the formed condensate efficiently downward, ensuring complete drainage and improving frost management and de-icing performance.

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With the new vertical louvered-fin plates, condensate drainage and coil behavior under frosting conditions closely match that of conventional finned-tube coils, as the fin geometry of Kaltra's new evaporator coils closely resembles that of traditional designs — while retaining all the advantages of microchannel technology.

The new horizontal-tube arrangement additionally allows for multi-pass refrigerant circuitry, delivering higher overall heat-transfer performance and superior efficiency in reversible (condenser) operation.

Another key innovation lies in the manifold design. The manifolds feature a special internal geometry with intermediate orifice plates, which promote turbulent mixing of the refrigerant's gas and liquid fractions. This improves uniformity of refrigerant across all microchannel tubes, ensuring consistent thermal performance and preventing the formation of superheated regions.

The circuit geometry has also been optimized by adjusting the number of tubes in each refrigerant pass, improving overall coil performance for both evaporator and condenser modes. With this design, Kaltra achieves an optimal balance between evaporator and condenser performance, ensuring high efficiency and stable operation in reversible systems.

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This latest coil generation was developed with a clear focus on heat pump applications, one of the fastest-growing segments in HVAC technology. Reliable reversibility, consistent drainage under frosting conditions, and minimized pressure drop make these coils an ideal choice for modern heat pump systems that must maintain performance across a wide range of ambient conditions. Extensive laboratory and field testing have confirmed the coils' outstanding performance under repeated frosting and defrosting cycles.

More about reversible microchannel coils