A rotary booster driven free-cooling unit using ambient cold was proposed for small and mediumsized data center free cooling. The influences of heat exchanging area, refrigerant charging qualityand condenser fan frequency on cooling capacity, rotary booster power and energy efficiency ratio(EER) were studied experimentally under different working conditions. Results indicated both thecooling capacity and EER increase with the refrigerant charging quality. With the increase of indoorand outdoor temperature difference Δt, the rotary booster power reduced to about 0.6 kW while thetemperature difference was 25°C. And the EER was improved by appropriately reducing thefrequency of the condenser fan. When the refrigerant charging quality was 5 kg and condenser fanfrequency was 30Hz, the cooling capacity of free-cooling unit with dual heat exchangers was 20.2kW and the EER was 18.4 when the indoor and outdoor temperature difference was 25°C.
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