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Improvements in component technologies and usage lead to energy savings in chillers. Advancements such as inverter driven compressor, improvements in heat exchangers, etc. lead energy savings from 5% to 50%.
|Component||Comments/Improvement measures||Indicative savings range (%)|
|Compressor||For systems over 200 kW, BAT is oil-free centrifugal compressor with magnetic levitation bearings||30% to 50%|
|Compressor||Variable speed inverter control, matching speed to cooling demand||30% (up to 50% in some applications)|
|Heat recovery condensers||Employ special heat exchanger to use waste heat rejected from chillers for useful heating purposes||-|
|Improved heat exchangers||Improved design evaporator, e.g., by microchannel type system||10%|
|Evaporative coolers / Water cooled condensers||Consumes water and require maintenance for health protection, However, significant energy savings are obtained in most applications||15% to 25%|
|Improved and inverter driven (variable speed) condenser fans||Most efficient solutions will have larger fans and variable speed drive to closely match flow with cooling demand||Typically 5% but can be more|
|Improved expansion valve||Electronically controlled||9%|
Rather than the capital cost of the chiller, a net present value of chiller over its lifetime gives a better perspective of costs associated with chillers. Since chillers operate for approximately 25 years maintenance and energy costs become indispensible. E.g., a € 150,00 average efficiency chiller can cost € 2.5 million to operate and maintain for 25 years while a € 180,000 high efficiency, best value chiller may only cost €2 million to operate and maintain.