Data centre cooling system

A method of cooling servers in a data centre, wherein the servers are mounted in server racks arranged in at least one row along at least one cold aisle, the at least one cold aisle being segregated from at least one hot aisle by the at least one row of server racks, the servers each including at least one fan for drawing cooling air from the at least one cold aisle, wherein the data centre comprises a cooling air source, the cooling air source being an indirect air handling unit having an external air flow path segregated from an internal airflow path, the internal air flow path being in fluid communication with the at least one cold aisle, the indirect air handling unit comprising one or more heat exchangers for exchanging heat between air flowing along the internal air flow path and air flowing along the external air flow path, wherein the servers are cooled by operating the fans of the servers to transport cooling air from the cooling air source to the at least one cold aisle and hence to the servers and back to the cooling air source, wherein the fans of the rack-mountable electronic equipment are necessary and sufficient to directly cause circulation of the cooling air between the cooling air source and the one or more cold aisles without the aid of gravity.

A data centre, wherein the data centre accommodates a plurality of servers mounted in server racks arranged in at least one row along at least one cold aisle, the at least one cold aisle being segregated from at least one hot aisle by the at least one row of server racks, the servers each including at least one fan for drawing cooling air from the at least one cold aisle, wherein the data centre comprises a cooling air source, the cooling air source being an indirect air handling unit having an external air flow path segregated from an internal airflow path, the internal air flow path being in fluid communication with the at least one cold aisle, the indirect air handling unit comprising one or more heat exchangers for exchanging heat between air flowing along the internal air flow path and air flowing along the external air flow path, and wherein the data centre is structured so that cooling air is transported from the cooling air source to the at least one cold aisle and hence to the servers and back to the cooling air source by operation of the fans of the servers, wherein the fans of the servers are necessary and sufficient to directly cause circulation of the cooling air between the cooling air source and the one or more cold aisles without the aid of gravity.