IT equipment cooling

A system for cooling gas heated by passing the gas over heat-producing equipment to cool the equipment, the system comprising:

• a heat exchanger including a first heat transfer mechanism configured to transfer heat from the heated gas to a first coolant;
• a first condensing module connected for fluid communication with the heat exchanger and including second and third heat transfer mechanisms, the first condensing module being configured to transfer heat through the second and third heat transfer mechanisms from the first coolant to second and third coolants in the second and third heat transfer mechanisms, respectively, the first condensing module comprising:
• a first cooling subsystem including the first heat transfer mechanism and being configured to receive heated vapor phase first coolant and to transfer heat from the first coolant to the second coolant in the first heat transfer mechanism to cool and condense the heated first coolant;
• and
• a second cooling subsystem including the second heat transfer mechanism and being configured to receive heated vapor phase first coolant and to transfer heat from the first coolant to the third coolant in the second heat transfer mechanism to cool and condense the heated first coolant;
• at least one processor electrically coupled to the first condensing module and configured to control which of the first and second cooling subsystems cools and condenses the first coolant;
• and
• a distribution arrangement connected for fluid communication with the first condensing module and the heat exchanger and configured to transfer the first coolant from the first condensing module to the heat exchanger.