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Airedale launches chiller with '50 per cent energy saving'

Airedale launches new free-cooling chiller claimed to save over 50 per cent in energy consumption and can spend over 95 per cent of the year in free-cooling

Airedale International Air Conditioning has launched the OptiChill FreeCool, a large capacity, free-cooling version of its high efficiency R134a air cooled OptiChill screw chiller.

The company claims the chiller can save over 50 per cent in energy consumption and can spend over 95 per cent of the year in free-cooling.

The application of concurrent free-cooling and cutting-edge technology driven by smart control logic ensures the OptiChill FreeCool gives the best energy balance for all operating conditions.

Highly energy efficient, the 750 – 1300kW OptiChill FreeCool offers more than 95 per cent free-cooling over a year (cumulative hours, London, UK) and can save more than 50 per cent of the energy consumed by a conventional chiller, greatly reducing operational costs.

For up to 30 per cent of the year, the OptiChill FreeCool can operate purely in free-cooling mode, with Free-cooling Energy Efficiency Ratios (EERs)* of up to 75, significantly reducing operating costs throughout the product’s lifetime.

Four case sizes; two free-cooling variants (two and three rows of coils); three fan variants including optional EC fans** and two sound level variants in each range, present a choice of over 200 model permutations. This flexibility, together with a raft of options, allows selection of the optimum specification.

New modulating screw compressor technology offering high performance coupled with low sound and vibration levels, sees a 12.5 deg C increase in the operational evaporating temperature range.

This allows supply water temperatures to be increased, raising the free-cooling threshold and giving enhanced compressor efficiency and reduced power input. A 1 deg C increase in fluid temperature can give a 10 per cent increase in the chiller energy efficiency.

The compressors also offer eight stages across dual refrigerant circuits for optimum efficiency, performance and reliability. Optional economisers, each with dedicated electronic expansion valve, enhance compressor performance at full and part load.

The efficient shell and tube evaporator with freeze protection offers an extremely high evaporating temperature for a given supply water temperature.

Large surface area condenser coil benefit from enhanced tube and fin for greater heat exchange, improving air flow configuration without increase in sound and further enhancing system performance and efficiency.

When applying interactive head pressure setpoint management, the controls strategy for the OptiChill FreeCool modulates the fans to achieve the optimum efficiency (peak EER) for the unit at any ambient temperature.  Sound levels are also reduced particularly in part load operation.

The inverter-controlled pump option with flow monitoring and water filter offers the ultimate in water flow control. Significant energy savings can be made by running the pump to achieve exactly the right flow for the application.

An optional Chiller Sequence Manager integrates up to eight chillers into a single operating system to provide best-fit, energy-efficient solutions, ensuring equal usage of compressors and allowing remote set point adjustment and alarm management. Energy Manager for power consumption analysis is also an option.

ACIS, theAiredale Controls Integrated System, integrates the OptiChill FreeCool with Airedale’s precision air conditioning and IT cooling products to provide real end user benefits in reducing power usage.

*Free-cooling EER at 15 deg C return water; 20 per cent ethylene glycol; 3 deg C ambient temperature and based on TOTAL input power of fans. Free-cooling is available for up to 95 per cent of the year

** Standard AC fan, optional EC (Electronically Commutated) fan or high air flow EC fan

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