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Spiral coolers

 Spiral coolers

Standard Tech Impianti offers turnkey Cryorapid® cooling, freezing and quick-freezing spiral tunnels. The container cabinet made in Isostandard® non-oxidizable panels adopts “labyrinth seal” joint technology between the panels themselves, guaranteeing exceptional heat insulation with consequent substantial energy savings.

The flooring, whose insulation is essential in quick-freezing rooms, is made with insulated and reinforced panels that allow the foundation to be correctly ventilated. The panels are connected to special steel sheets, welded on site, suitable for creating a monolithic sealed tank in the internal part of the room in order to avoid criticality during washing and sanification operations.

How the spiral coolers work

The spiral coolers conveyors are entirely constructed in stainless steel, with drum or external drive shaft technology, and are connected to special polyacetal or stainless steel belts suitable for direct contact with foodstuffs.
The drive shafts of the spirals are connected to low energy consumption motors, geared motors and bearings made by companies of primary global importance, all designed to maximally limit lubrication and related hygiene problems. The cooling coils are the heart of both blast chiller and blast freezer equipment: as a matter of fact, they must guarantee the cold inside the room, avoiding shut-down periods due to unavoidable defrosting procedures as much as possible.

The elements are connected to Ecofreddo® refrigeration plants that use ammonia, CO2, freon and a water-glycol mix, are equipped with energy-saving devices such as dynamic condensation control or compressor frequency converters, and are made with wide, or sometimes differentiated, fin spacing. The use of differentiated fin spacing (with a width of up to 48 mm) allows for the number of defrosting procedures to be reduced to once per day in the case of quick-freezing and freezing and to once per week for blast chillers.

The first part of the element, the one with the widest fin spacing, has “sacrificial rows”: the air flow in recirculation drawn in by the fans enters into contact with this part of the machine first; this air contains the most humidity of the entire process since it has just cooled a high-temperature product which released part of its heat and humidity. The removed humidity present in the recirculation air will frost once in contact with the cold surface of the coil, but since this area is widely spaced, accumulated ice packing and forming on the fins is avoided.

As the air in recirculation passes through the finned heating element, it is cooled, finding an even thinner fin spacing, but the risk of excess frost is avoided thanks to the low amount of humidity passing through the coil.
The fans are highly efficient and have air flow control systems through frequency converters.  In order to optimise the air flow and heat exchange of the blast chillers/freezers, stainless steel conveyor sheets are installed between the spiral conveyors and the coil, avoiding bypass phenomena on the heating elements, given the significant air flows at play, and covering the product directly with the flow.

The PLC that manages the blast chillers/freezers includes the possibility to set different recipes, varying – based on the hourly production quantity, the weight and size of the products – the blast times and all the key parameters of the process.

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