With the new range of GEA air-treatment models, the replacement program is complete:  satisfactory air-treatment solutions are now available in the product portfolio of GEA Air Treatment, for almost every industrial and commercial application. In accordance with their individual features, the available models serve for air ventilation, heating, filtering, or cooling. They operate in recirculated-air or mixed-air mode, and they control air temperature by integrated heat exchangers that obtain their useful energy from hot-water, steam, or cold-water circulation systems. The unit heaters are mounted on the wall or from the ceiling.

HN models for normal requirements

For operation in a normal industrial environment – or, for example, in DIY stores, warehouse buildings, and in many other applications – HN models (introduced already in 2005) are effectively satisfactory. Available in five model sizes, they enable air flow rates of approx. 1,200 to 12,000 m³/h, and heating output up to 130 kW (this heating rating is with reference to 80 / 60°C for supply and return flow, respectively, and 15°C air-intake temperature). In comparison to their predecessor models (the MultiMAXX M3, M5, and M7), they offer more combination possibilities for their components (i.e., intake and outlet accessories, motor variants, and heat exchangers), as well as enhanced performance characteristics thanks to their optimized heat exchangers. These exchangers are available in galvanized steel or in copper pipe, with copper or aluminium louvers. The media connection is possible from left, right, or above. HN models satisfy recirculated-air regulations as set forth in VDI 6022. The customer has the following selections:  as industrial models with steel-sheet enclosures, with baking-enamelled steel-sheet enclosures (with RAL colours as desired), or with colourful design panels (RAL 7000), or in any other RAL colour upon request.

HS models – with long life cycles, even under adverse ambient conditions
GEA engineering designers have developed the GEA MultiMAXX HS for application in demanding operations such as the food- and beverage-processing industry. All components of these models consist of stainless steel or other corrosion-resistant (non-metallic) materials:  which assure hygienic conditions and guarantee long years of service life, even in aggressive ambient surroundings. The HS models are available in 4 dimensional sizes, and enable air flow rates of approx. 1,000 to 8,000 m³/h, as well as heating outputs up to approx. These models are manufactured exclusively as industrial versions, with stainless-steel enclosures. They have long-life heat exchangers made of stainless steel or full-bath-galvanized steel. These HS models are the improved follow-up versions of the stainless-steel MultiMAXX M4.

HX models:  protection for potentially explosive atmospheres – sealed and certified

Where even the smallest spark represents a danger, then conventional factory heating systems are out of the question. For all applications in which the earlier MultiMAXX M4-Ex was the system of choice, GEA MultiMAXX HX models now go into action. They are certified for potentially explosive atmospheres, and even satisfy stipulations in accordance with Ex-de regulations. They feature functional galvanized or stainless-steel enclosures, as well as heat exchangers made of steel, copper-copper, or copper-aluminium. Their external-rotor motor offers the required protection in potentially explosive atmospheres – as does, for example, the surface-finish of the fan blades, which prevents sparking. With 4 sizes, the HX models cover the air-rating range up to approx. 9,000 m³/h, as well as heating output from several KW up to around 70 kW.

HD models – when you can do with a little more output
Superficially, GEA Type MultiMAXX HD models are exactly identical to model HN units. Both are available with design panels, or in the functional industry versions. The dimensions of HD model sizes 1 to 4 also match the standard. The actually significant differences are apparent only after carefully looking inside. A diagonal fan really puts the (air) pressure on with the HD models. With dimensions comparable to other models, these fans produce greater air output, greater air-projection ranges, and enhanced heat input. The Benjamin model outputs approx. 1,000 m³ per hour, and its most powerful brother makes it up to around 12,000 m³/h. The heating rating of HD models extends to over 120 kW, regardless of ambient or media temperatures. A comparison with HN models shows the following:  only the voluminous HN model, in model size 5 (for which there is no counterpart in the HD models), can beat these ratings. The introduction of the MultiMAXX HD means that the model M6 has found its worthy successor.

As our customers require:  electricity or natural gas can provide heat
If requested, we can also deliver MultiMAXX equipment in Germany that uses electrical heating (the HE models), or that is equipped as alternative with direct natural-gas firing (the HG models). These models have proved satisfactory in other markets, and are particularly suitable when hot water cannot be provided to the system, or if frost protection means that operation with water heat exchangers is not advisable.

Proven accessories:  secondary air louvers

Secondary air louvers, earlier known in work with predecessor models, are now available for all MultiMAXX models (except for HX versions). They enable optimal intake of air:  the positioning of the air-control vanes influences the air speed and the air-exhaust temperature of the entire air flow. This technological advance allows GEA to achieve air-projection ranges and fast heat-up of temperature-controlled industrial halls. At the same time, optimal design implementation ensures low temperature stratification (i.e., 0.2 K/m) and low air velocities (0.2 m/s) in areas occupied by persons. The results: the comfort zone is appreciably larger than with conventional air-treatment equipment without secondary air louvers. Warm air is uniformly distributed throughout rooms, and does not accumulate under the ceiling. Users can therefore forget about hot heads and cold feet, even in commercial and industrial environments.

Supply and exhaust air-management with GEA MATRIX – everything is under good control

A complete heating and ventilation system can be assembled from one supplier (GEA):  from a wide selection of MultiMAXX equipment with mixed-air option, RoofJETT roof extract fans, and the GEA MATRIX closed-loop control systems. In such combinations, GEA MATRIX manages the minimum air exchange rates, prevents possible freezing of pipes during temperature-reduction mode, and synchronizes supply- and exhaust-air volumes. Since the closed-loop control system here has its own bus system – the GEA MATRIX.net – the wiring, parameterization, and programming of the system is considerably more cost-effective than with conventional technology. This air management can also be implemented in explosion-endangered zones, since GEA RoofJETT models are also available in models designed for use in hazardous atmospheres.

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