Patent ID: 8789384

Claim:
A method, comprising: generating airflow through rack-mounted computer components and then in series through first and second sections of an air-to-liquid heat exchanger; independently controlling the flow rate of a first liquid coolant to the first section of the air-to-liquid heat exchanges and the flow rate of a second liquid coolant to the second section of the air-to-liquid heat exchanger to enforce a target cooling parameter in response to the heat generated in the rack being less than a heat setpoint or the temperature of the first liquid coolant being less than a temperature setpoint, wherein the second liquid coolant has a lower temperature than the first liquid coolant; and supplying the second liquid coolant to both the first and second sections of the air-to-liquid heat exchanger in response to the heat generated in the rack being greater than a heat setpoint or the temperature of the first liquid coolant being greater than a temperature setpoint.