Precision air conditioner

Refrigerant economizer option available for Lambda DX CRAC units

Kaltra is set to launch its Lambda DX precision air conditioning system employing pumped refrigerant economizer. Lambda DX combines direct expansion operation during warmer ambient temperatures and refrigerant economizer mode during cooler temperatures, resulting in a reduction in annual power consumption for the system.

When outdoor ambient temperatures are low enough, the system runs an integrated pump to circulate refrigerant instead of operating the compressors. The refrigerant pump requires only a small fraction of energy used by the compressors, allowing for reduced power consumption in annual operation. As the ambient temperature rises, the Lambda DX system transitions to compressor operation.

Equipped with a pumped refrigerant option, the Lambda DX system provides significant efficiency advantages over traditional direct expansion air conditioners, as to yield the same cooling capacity, refrigerant pump consumes about 5% of the energy needed for compressors.

The system control adjusts the point of economization based on actual cooling demand, thus maximizing economization hours. Mixed compressor/pump operating mode available for two-circuit Lambda air conditioners.

CRAC units efficiency comparison

Figure 1: CRAC systems efficiency comparison

In pumped refrigerant mode, the refrigerant temperature is controlled by regulating the fan speed of the condenser. In this case, fan speed control changes from pressure control to temperature control.

With pumped refrigerant economizer, Lambda DX represents the industry’s most efficient and flexible room-level direct expansion cooling solution, most suitable for data center and other IT cooling applications, as well as for any mission-critical cooling applications.

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) 89 943 99-8-66 or visit