Airedale pushes the boundaries of free-cooling chillers

Airedale, OptiChill, air conditioning, free cooling, chiller

Airedale’s OptiChill FreeCool large-capacity chillers maximise the use of free cooling to save more than half of the energy used by a conventional chiller. For up to 30% of the year these chillers can operate purely in free-cooling mode with an EER of up to 75 (15°C return water, 20% ethylene glycol, 3°C ambient and based on total input power to the fans). Some free cooling is available for 95% of annual operating hours (in London).

The range has models with cooling capacities from 750 to 1300 kW. There are four case sizes, two free-cooling variants (two and three rows of coils). three fan variants (including EC fans and two sound-level variants in each range. In all, there are over 200 model permutations.

The refrigerant is R134a with new modulating screw compressors to achieve a 12.5 K increase in the operating evaporating temperature range. Increasing the temperature of the supply water by 1 K can increase chiller efficiency by 10%.

The compressors offer eight stages across dual refrigerant circuits.

When applying interactive head-pressure setpoint management, the control strategy modulates the fans to maximise EER for any ambient temperature.

Chilled-water pumps can be inverter controlled to achieve significant energy savings.

Up to eight chillers can be integrated into a single operating system.

For more information on this story, click here: October 2012, 82
Related links:
Related articles:



modbs tv logo

LG supports fast-moving WeWork project

How LG Air Conditioning helped WeWork London achieve a fast project with great results.

MBStv at the BESA National Conference 2019

The BESA National Conference 2019 saw over 200 delegates gather to discuss the industry’s challenges and opportunities. MBStv was there to capture it all.