Method for controlling a cooling system for autonomous cooling of a rack

A cooling system for autonomous cooling of a rack, the rack comprising at least one heat generating component, the cooling system comprising:

• at least one fan mounted onto the rack and configured for generating an air flow of ambient air within the rack, the air flow receiving at least a portion of a thermal energy generated by the at least one heat generating component in the rack;
• a closed loop comprising:
• at least one liquid cooling unit thermally coupled to the at least one heat generating component, the at least one liquid cooling unit comprising a liquid channel configured for transferring thermal energy from the heat-generating unit to a first heat transfer fluid flowing in the liquid channel,
• a first primary side of a first liquid-to-liquid heat exchanger, the first primary side being fluidly connected to the liquid channel of the at least one liquid cooling unit, and
• at least one pump fluidly connected between the first primary side of the first liquid-to-liquid heat exchanger and the at least one liquid cooling unit, the at least one pump being configured causing the first heat transfer fluid to flow within the closed loop;
• an open loop comprising:
• an air-to-liquid heat exchanger mounted to the rack so that heated air expelled from the rack by the at least one fan flows through the air-to-liquid heat exchanger before being rejected as ambient air, the air-to-liquid heat exchanger being configured for receive a second heat transfer fluid from a first cold supply line, and
• a first secondary side of the first liquid-to-liquid heat exchanger, the first secondary side being thermally coupled to the first primary side for transfer of thermal energy from the primary side to the first secondary side when a temperature of the primary side is higher than a temperature of the first secondary side, the first secondary side being fluidly connected to the air-to-liquid heat exchanger, the first secondary side being configured for returning the second heat transfer fluid to a hot return line;
• and
• a controller operatively connected to the at least one fan and the at least one pump, the controller being communicatively connected to at least one sensor configured to measure temperature indications.