Rotkäppchen Mumm

Rotkäppchen-Mumm needed a chilling system for the vacuum dealcoholizing process for the production of its alcohol-free alternatives, such as "Rotkäppchen Alkoholfrei" and "Mumm Dry Jahrgang Alkoholfrei", at its Eltville plant. However, the site is situated in the town’s historic center, right next to the banks of the Rhine. Rotkäppchen-Mumm therefore wanted to prevent noise disturbance to residents. So, the first challenge was to install a liquid cooling system that could provide the necessary cooling capacity and operational reliability, but with the lowest possible noise level.

The greatly fluctuating water flowrates posed a further challenge. The degree of required cooling varies greatly depending on the production phase, so that sufficient reserves are required for fail-safe operation.

In order to generate the required cooling capacity and satisfy the noise constraints, Rotkäppchen-Mumm chose a CyberCool 2 from STULZ with a cooling capacity of 860 kW. The unit’s "Axi-Top" fan diffuser attachments are specially designed to maximum efficiency while guaranteeing minimal noise levels. Moreover, deliberately oversizing the heat exchangers of the chiller allows the system to run at a reduced fan speed. This also has a positive effect on sound output. Another advantage of this oversizing is the increased energy efficiency and durability of the system, which covers approx. 70 % of production capacity even with a single refrigerant circuit.

To ensure fail-safe operation, the vacuum dealcoholizing process demands dramatically different water flowrates in the various phases. To meet this challenge, a 6 m³ buffer tank was designed and installed, to always provide sufficient water for each phase of the process. The tank and all pipework were constructed of stainless steel 1.4571 to AD2000. What’s more, the system features two redundant refrigerant circuits, each of which is equipped with a Bitzer screw compressor.

The chilling system was manufactured at STULZ’s Hamburg plant and tested on the company’s own performance testing station to ensure it met the necessary operating and design conditions. This considerably reduced time spent on start-up at the customer’s site.

Production and installation planning, including individual components and pipework, was all in 3D for greater peace of mind, and was performed on site.

Since Rotkäppchen-Mumm had purchased a turnkey solution, STULZ coordinated acceptance testing by the approved inspection agency and was continually at hand during this process.

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