Evolutions and revolutions
12. 08. 2016 At Chillventa in Nuremberg, Kelvion (formerly GEA Heat Exchangers) will present its portfolio of heat exchangers, as well as commercial and industrial cooler systems. The Kelvion “glass cooler” to be shown at Chillventa adds transparency to a display of industrial processes. This item being exhibited at the fair is a Goedhart VCI-p-13457 air cooler, in which some of the copper tubes have been replaced by glass to reveal what goes on inside. Fair visitors can therefore follow the evaporation process inside the cooler. This model features a third, additional heat exchanger circulation system as condenser – which enhances the output of a compressor and heats air.
Further items to be exhibited by Kelvion at Chillventa include:
Premiere at the fair: The new dual-discharge cooler
The new Kelvion industrial air cooler with air outlet at two sides will be shown as a world premiere. This model represents a further development of the Kelvion dual-discharge, but with radial fans – an innovation among industrial coolers. The new cooler design produces air flow at a 90-degree angle, which enables reduction of performance losses in comparison to coolers with axial fans. It also enhances the flow of air onto the heat exchangers and thereby allows reduced system height without loss of cooling duty. At Chillventa, Kelvion will announce details on model sizes, equipment variations, and the name of the new cooler range.
Searle GF gas coolers for CO2-refrigeration systems:
Smaller heat exchanger tubes for increased heat transfer
Less refrigerant content, a smaller footprint, and significantly reduced weight – Kelvion has enabled all this with its redesigned Searle GF gas coolers for subcritical and transcritical CO2 refrigeration systems. These coolers, equipped with AC or EC motors, profit from the new heat exchangers with tube diameters of only 5 mm. The thin tubes – which are ideal for CO2 as refrigerant, with its favorable thermal properties – allow cost-efficient cooler solutions for applications with high pressures. Kelvion developed its Micro Tubes with the aid of numerical flow simulation and optimized them in prototype tests in a wind tunnel. These tests revealed that a non-equilateral tube configuration represents an optimal solution. The result is heat transfer that is 18 % greater than the most efficient Kelvion heat exchangers until now.
Quiet and powerful: the Küba SG Industrial models for industrial applications
For the application range of approx. 5 to 188 kW cooling duty (depending on refrigerant), Küba SG air coolers are designed for industrial use. The injection numbers in these coolers lead to enhanced performance levels, in accordance with individual applications. The improvement in heat exchanger geometry and the aerodynamically optimized fan system likewise contribute to efficiency. The advanced fans require up to 70 % less power than with fan drives from earlier generations without control systems – and they allow draw-through or blow-through operation. In addition, they operate up to 16 dB(A) quieter than previous fans. Further characteristics become positively apparent, such as components that are easy to access and clean – especially for applications in areas such as food and beverage processing and logistics. The drip tray, for example is hinged, and the fans as well as side components can be swiveled out for ease of cleaning.
Lean technology for refrigerated catering displays and equipment: the Küba gastro slim FM
With its Küba gastro FM range, Kelvion already offered compact and high-performance coolers from its portfolio for slim refrigerated counters, display cabinets, and tables. These systems can be used at a side wall (single-side discharge), or behind the center column (double-side discharge). The new Küba gastro slim FM needs even a smaller footprint. It has an installation width of only 75 mm and therefore fits behind the center column of virtually any refrigerated counter. The patented air straightener guarantees uniform temperature distribution in refrigerated display cases and considerably shortens cooling-down periods. For applications down to -30 °C, it is possible with little effort to retrofit an electrical defrost unit. Its high-quality and food-safe powder coating makes the Küba gastro slim FM ideal, even for open-display or acidic-content goods: for example, marinades. These units are available in three model sizes, with cooling duties of 0.11 to 0.23 kW. In their standard versions, these models are prepared for CO2 up to a pressure level of 60 bar, for applications in transcritical ranges and above-freezing refrigeration.
Highly corrosion resistant and robust: the VacInox heat exchanger range
With its VacInox heat exchanger range, Kelvion satisfies the strictest demands for applications in potable-water supply and in industrial processes. The highly resistant connection of its stainless steel plates enables compact design and great corrosion resistance. Kelvion has developed its own brazing filler metal, which does not contain non-ferrous metal, with the result that VacInox heat exchangers meet strict specifications for high temperatures and pressure up to 35 bar. VacInox units are designed for potable-water installations, laser refrigeration, district heating systems, and – for example – as evaporators and condensers in ammonia facilities.
Further improved: the brazed heat exchangers from the ConBraze range
The brazed heat exchangers in the ConBraze range, thanks to their innovative vortex cells, offer a great number of new possibilities. They produce great turbulence in the tunnel and assure enhanced heat transfer as a result. In addition to performance enhancement, benefits of the new range include greater compressive strength, significantly smaller refrigerant charges, and low operational costs. Possible areas of use are heat pumps for heating or for water heating, central fresh-water heaters, apartment and building connection stations, and district heating transfer stations.
Brazed plate heat exchangers of the GBH-HP range for operations up to 140 bar
With its brazed plate heat exchangers in the GBH-HP range, Kelvion offers especially robust models for applications under operational pressures up to 140 bar and temperatures from -40 to +150 °C. The applications of these stainless steel plates, copper brazed, especially include use in subcritical and transcritical CO2 heat pumps and refrigeration systems: e.g., as oil coolers, for heat transfer in industrial heating and cooling systems, and for power stations. The larger ranges GBH-700 and GBH-1000 are fitted in the production plant with the patented Safety Chamber™. They absorb stress from temperature differences and pressure pulses, which would otherwise lead to leakage. The smaller range GBH-HP 500 is available with simple stainless steel heat exchangers, or with double-wall plates. For the use of the 500-range models as evaporators, the Full Flow System assures optimal flow around the pipe fittings and prevents freezing of the flow tunnels. All model ranges are available as AE versions, with patented Delta Injection™ for optimized evaporator operation.
Kelvion at Chillventa, in Nuremberg, 11 to 13 October 2016, Hall 7, Stand 7-204
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