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Stulz launches second generation AHUs

GERMANY: The CyberHandler 2 from Stulz is a totally redesigned air handling unit available in eleven sizes from 30kW to 520kW.

The new range builds on the success of the first Stulz air handling system introduced in 2015 and combines free cooling, adiabatic cooling and mechanical chilling in one sealed outdoor container.

The choice of chilling methods includes chilled water coils, scroll compressors or a redundant DX system with external condenser. If high availability is required, a fully weather-independent air conditioning system with a high level of redundancy can be designed, and can work in mixed mode for great energy efficiency, says Stulz.

One of the key new features is said to be the optimised dual brazed plate heat exchanger, which improves the mean efficiency of the overall system. This enables a larger distance between flaps which reduces air-side pressure drops, and slashes the average energy consumption of the fan units. Another new feature is the design of the brazed plate heat exchanger module and the floor pan of the filtering section. In the new series, both these areas are made entirely of stainless steel.

Like its predecessor, the CyberHandler 2 offers free cooling. As the air conduction is indirect, no contaminated outside air gets into the data center, and filter systems also have less to deal with, says Stulz. When combined with an adiabatic module, the runtimes of high-consumption mechanical chilling can be cut to a minimum. Up to 70% energy savings are said to be achieved compared with pure DX cooling.

The overall more simple installation of electrical distribution boards and pipework also brings cost advantages. Simply by reducing the electrical infrastructure, possible CAPEX savings of 6 to 8% can be achieved, depending on project conditions, compared with air conditioning solutions with traditional closed-circuit air conditioning technology.

With the CyberHandler 2 Select, planners and refrigeration specialists now have access to configuration software for the new series. helping with project planning, AHU selection and tender preparation. The package includes servicing, start-up and planning and documentation functions, such as the calculation of lifecycle costs and partial PUE values.


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