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CO2 heat pump with variable-displacement compressor/expander in the pipeline

This CO2 heat pump will use oil-free variable-load compressor and variable expander technology, currently tested at Purdue University’s Herrick Laboratories.
Last August, The United State Energy Department announced 12 projects aimed at developing innovative heating, cooling and insulation techniques as well as open source energy-efficiency software to help homes and businesses to make energy savings.

One of the blueprint projects is an oil-fre...

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