Adaptive cascade cooling method for datacenters

A hybrid cooling system for a datacenter, comprising:

• an air-cooling unit (ACU) configured to be disposed in a data hall of the datacenter;
• a coolant distribution line comprising a first portion, a second portion, and a third portion, wherein the first, second, and third portions are in series fluid communication and the ACU receives supply of a coolant via the first portion;
• a coolant distribution unit (CDU) coupled to an electronic component in the data hall, wherein the ACU and the CDU are in series fluid communication via the second portion of the coolant distribution line and the coolant egressing the ACU passes through the second portion to be fed back to the CDU;
• an ACU bypass line connecting the first portion to the second portion bypassing the ACU;
• and
• an ACU bypass valve coupled to the ACU bypass line to control the flow of the coolant from the first portion to the second portion via the ACU bypass line, wherein a flow of the coolant in the ACU bypass line between the first portion and the second portion increases when the ACU bypass valve is adjusted from an air-cooled mode to a liquid-cooled mode.

A method of cooling a datacenter, comprising:

• disposing a hybrid cooling system in an operative position in the datacenter, the hybrid cooling system comprising an air-cooling unit (ACU), a coolant distribution unit (CDU), a coolant distribution line, and a heat exchanger, wherein the ACU receives supply of coolant from a chiller plant via a first portion of the coolant distribution line, the ACU and CDU are in series fluid communication via a second portion of the coolant distribution line, and the CDU and the heat exchanger are in series fluid communication via a third portion of the coolant distribution line;
• operating the hybrid cooling system to cool the datacenter, the operating comprising:
• pumping the coolant from the chiller plant to the ACU through the first portion of the coolant distribution line;
• feeding the coolant egressing the ACU back to the CDU through the second portion of the coolant distribution line;
• and
• adjusting flow of coolant to at least one of the ACU or the CDU based on cooling load in the datacenter.