Microchannel heat exchanger brazing

Kaltra breaks new ground with microchannel coils for A2L refrigerants

Kaltra, well known for its microchannel heat exchangers, including ones with low volume and low refrigerant charge, installed and commissioned new fin machines, which made it possible to design and manufacture high-capacity coils with the exact small charges.

On average, the capacity increase is 20% for new condensers and 25% for evaporator coils.

Named for their ASHRAE safety classification, A2L refrigerants, specifically R290 (propane – became extremely popular as refrigerant in recent years), as well as R32, R454b, and others, highlight mild flammability, low global warming potential (GWP), and low toxicity. The A2L flammability classification of these refrigerants restricts charge amounts, making the internal volume of heat exchangers a characteristic of the highest importance for manufacturers.

New coils expand the application range for air conditioners based on that technology. Together with Kaltra’s know-how in pre-dehumidification (patent pending), this promises a new level of efficiency  for heat pump units by reducing defrost operation time.

Besides, new coils demonstrate exceptional efficiency in subcooler applications, e.g., air-cooled chillers, delivering very close approach temperatures and reducing exergy losses. For the coming scroll chillers range, Lightstream Scroll Evo, Kaltra will offer a solution for mild climates with the advantage of low refrigerant charge, R32, R454b, and R290, as well as a high-ambient condenser option — all based on newly engineered coils.

Currently, Kaltra offers more than 400 combinations of tubes and fins for its microchannel heat exchangers, with different widths of multiport tubes, port numbers and sizes, and fin pitches. This extensive range allows for a high level of customization – the broadest in the industry – of heat exchangers to be tailored to meet customer specifications.

Headquartered in Germany and Austria, Kaltra designs, develops, and manufactures air conditioning and refrigeration equipment and systems. The company offers air-cooled, water-cooled, and free cooling chillersprecision air conditionersIT cooling systems, including room-, rack- and row-based solutions, and energy management solutions. It also designs and manufactures air-cooled condensersdry coolers, and cooling units for special applications. Additionally, Kaltra offers microchannel heat exchangers for condenser, evaporator, and water cooling and heating applications, as well as aluminium coils for small cooling applications. All Kaltra products are engineered with the clear objective of improving energy efficiency and reducing total cost of ownership.

For more information on Kaltra and its products call +49 (0) 911 384 333 48 or visit www.kaltra.com