The performance of gas-pump-driven free-cooling unit for heat dissipation was analyzed in a small data center in Beijing. The operating characteristics of the unit were fitted to its operating curve. The results show that the heat exchange capacity of the unit increases with the increase in the difference between the indoor and outdoor temperatures. When the indoor and outdoor temperature difference was 11 °C

the heat exchange capacity was approximately 10.4 kW

and when the difference reached 23 °C

the heat exchange capacity was approximately 13.6 kW. The difference between indoor and outdoor temperatures is the main factor affecting the heat exchange capacity of the unit. The power of the gas pump decreases with the increase in the temperature difference. For differences of 11 °C and 23 °C

the power of gas pump was 1300 W and 810 W

respectively. When the outdoor temperature was ?3.7 °C

the heat exchange capacity of the unit was 13.6 kW

and the EER reached 10.40. When the outdoor temperature was lower than 15 °C

the gas-pump-driven free-cooling unit could meet the cooling load of the data center. Compared with the original air conditioning

the electricity power was reduced by 6842.24 kW?h

and its annual energy saving rate was 25.78%.