24 Aug 2017 | Aeroventic
STULZ presents chiller with integrated Free Cooling for data centers with low cooling needs

The new STULZ WPAmini delivers a cooling capacity of 160 kW in a very small space

Two separate refrigerant circuits increase operational reliability. Four scroll compressors guarantee energy efficiency, even in small partial load stages.

Hamburg, 2017/08/22 – With the WPAmini, STULZ is expanding its product line of air-cooled chillers. The compact chillers deliver a cooling capacity of up to 160 kW and have been optimized for use in data centers or industrial chilling. The chillers are operated with two redundant refrigerant circuits to increase operational reliability. The circuits are controlled on the basis of the required cooling capacity, so that the respective circuit is activated with maximum efficiency when minimal cooling is needed. The WPAmini is equipped with maximum size aluminum microchannel condensers and four scroll compressors, which are activated and deactivated (25, 50, 75, 100 %) in stages, in line with the current heat load. The compressor operating time can be reduced to a minimum using the Free Cooling facility that can be incorporated as an option. This considerably cuts power consumption and operating costs. Three operating modes are available in all: DX mode, Free Cooling mode and Mixed mode. In Mixed mode, cooling capacity is generated by means of simultaneous Free Cooling and compressor cooling. In this way, significant energy savings can be achieved even at moderate outdoor temperatures.

For noise-sensitive locations, the WPAmini is also optionally available in a "Low Noise" version. Here, the compressors are enclosed in a special sound-insulated housing, which lowers the volume to conversation level. The chillers can also be fitted with optional fan diffusers. The improved air conduction these provide further reduces the noise level, as well as electricity consumption. The WPAmini can also run in extreme local climates. Its operating limits range from -40 to +50 °C, depending on the model. The switch gear cabinet is generously dimensioned at the factory, ensuring space for optional additional electrical equipment. There is therefore no need for additional switch gear cabinets or extensions, with the interface problems these sometimes entail. Furthermore, the WPAmini series already satisfies the requirements of Ecodesign or ErP Directive Stage 2018.

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