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New concept: penthouse coolersBauer Frischdienst is open for new approaches.

Line of Busi-ness:

Industrial Refrigeration

Application: Dairy Product Cooling

Country / City: Germany / Wasserburg

Fluid: NH3

Product: Wall/ceiling unit cooler AGHN(S-AGHN Penthouse)

Tradition and progress in harmony with eachother

Tradition and continuity do not necessarilymean a lack of development capability. Thiswas proven convincingly by Bauer Frischdienst(a private dairy) when it came time to find asuitable cooling concept for the new storagewarehouse to be built in Wasserburg am Inn.

The company TH. WITT KältemaschinenfabrikGmbH was hired to find a way to implementthe cooling requirements in a manner whichsuited the architectural solution already found.For the cooling area, the planning envisaged alarge storage building with three temperature

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zones, which did not have to be sharply sepa-rated from each other. For the refrigeration andair-conditioning components, quality productsfrom the company Güntner were chosen.

Erwin Stollmann, refrigeration systems engi-neering expert at WITT, explains: "Bauer Frisch-dienst made it clear from the start that theydidn't want a conventional concept with theevaporators mounted under the ceiling and thepiping routed between the units. They wantedsomething innovative." Together with a consul-tant from the company Güntner, Erwin Stoll-mann visualised the alternative approach.

This new concept involved so-called penthousecoolers, already widely used in the Americanmarket. This means that the evaporators arenot housed in the cold room itself, but in a sep-arate compartment on the roof of the build-ing. The air is blown through ducts into thebuilding's interior.

What at first sounds like an unnecessary ad-ditional investment actually brings numerousadvantages.

The units are easy to install.

Advantages for the building

As the evaporators were no longer mountedbelow the ceiling, the building height could bereduced by about 50 cm without changing thestorage capacity, which more than made up forthe additional costs of constructing the com-partment (penthouse) on the roof.

Advantages for the installation work

For a conventional installation, the units wouldhave had to be individually fastened to the ceil-ing at a height of eight metres, which wouldhave entailed significantly higher costs and,above all, would have taken longer.

With the penthouse construction, the unitscould simply be lifted onto the roof with acrane. Once the units were installed, the wallsand roof of the penthouse structure were builtaround the units.

The piping is also much easier to lay, as insteadof being laboriously installed overhead, it issimply routed along the side of the penthouse.Moreover, the material costs and installationcosts of impact protection are also saved: asthe piping is situated outside the hall, it can nolonger be damaged by forklifts. Also, the dripwater drainage is installed in the penthouseand no longer runs through the building.

The new concept has many advantages: positioning of the penthouse coolers and air distribution.

Advantages for operation and maintenance

The piping is easily accessible; it is also sim-ple to carry out work on the units. In addition,escape routes are perfectly integrated, as thepenthouse has several doors to the roof, so per-sonal injury in the event of a leak is practicallyruled out.

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Above all, operations in the building are notdisturbed during maintenance and servicing:the units can be accessed easily via the assem-bly aisle, there is no need for a hoisting device,normal work processes in the building are notinterrupted and the forklifts can still access theaisles.

In short, all challenges were met by meansof close cooperation between WITT, Güntnerand Bauer. As Erwin Stollmann points out: "Wefound the optimal system solution for the situ-ation at hand!"