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Case Studies > Hybrid Chiller 
Hybrid cooler reduces carbon footprint with reduced power consumption. 
Above: The unit is similar to many other packaged coolers externally 
Above: But inside things are more complex 
Having targeted one of the leading manufacturers of Linear accelerators for the treatment of cancer as a potential customer, TES realised that prior to our arrival the client had utilised standard air cooled refrigerated water cooling technology. 
 
By increasing the cooling water temperature from 15°C to 22°C, and using current technology, this allowed TES to offer a Hybrid solution incorporating standard refrigeration with free cooling. This new package would bring greatly reduced energy consumption, and with duty and standby water pumps offer a very reliable solution to a highly dependant process.  
 
The unit was almost 100% failsafe at the point, but to provide further belt and braces the package also includes an emergency mains water circuit. Previously the client used electrically operated valves to allow mains water through the system and out to drain providing emergency cooling in the event of chiller failure. The Hybrid cooler uses a water / glycol antifreeze solution, and the mains water cooling is achieved via an additional heat exchanger. This system removes the need for the costly electrical trace heating previously required, further reducing running costs. 
 
The Hybrid cooler measures the inlet process water and ambient air temperatures, in high ambient temperatures the refrigeration system provides cooling using the compressor and fan/s, and in lower ambient temperatures the free cooling uses only the fan/s to cool an additional radiator. The compressor being the largest motor in the unit, means much reduced power consumption. 
 
Linear accelerators are used for many hours during the day all year, as such you can appreciate that the chiller will see more lower ambient temperatures  
 
Having successfully supplied and commissioned many Hybrid units for this client in the UK, It is estimated that whilst in ‘Free Cooling’ mode the Hybrid Cooler saves approximately 2,000 kWh per annum. This is equivalent to annual savings of 850Kgs of CO2. 
Above: A linear accelerator being installed in a new bunker