Air-cooled screw chiller

Kaltra supplies high-efficient chillers for Sloterdijk, a business district in Amsterdam

Kaltra is finalizing manufacturing for air-cooled chillers with high-efficiency packages ordered by its customer in the Netherlands, intended to service a business center in Sloterdijk, Amsterdam municipality.

The project is focused on low energy consumption, cost efficiency, and environmental sustainability. Specializing in high-efficiency chillers, Kaltra selected its newest air-cooled solution based on screw compressors with stepless capacity regulation, Lightstream Screw II.

For plant reliability and load optimization purposes, the overall cooling load was distributed between 4 units of unequal capacities (for plant efficiency improvement) and will operate under the control of inbuilt sequence management software. The total calculated workload of 4MW cooling is split between two 1250kW and two 750kW chillers, supporting cooling loads from as low as 4% to peak capacity.

Newly introduced twin-slab condenser coils provide high subcooling, contributing to improved efficiency, particularly at partial loads.

The use of refrigerant R513a with a GWP value of as low as 573 (about 56% reduction vs. R134a) adds environmental sustainability to the solution. For safety purposes, the industry’s best-performing gas leak detectors were added to each chiller.

Commissioning and startup works will be performed by Kaltra engineers in February 2023. All equipment is subject to Kaltra’s 3-year warranty reinforced with a comprehensive Tier-III maintenance contract.

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) 911 253 421 07 or visit