Multi-rack assembly method with shared cooling unit

A method of fabricating a cooling apparatus comprising:

• associating a first heat exchange assembly with a first electronics rack comprising at least one first rack electronic component to be cooled;
• associating a second heat exchange assembly with a second electronics rack comprising at least one second rack electronic component to be cooled;
• providing at least one cooling unit within the first electronics rack;
• providing a primary coolant loop within the first electronics rack coupling in fluid communication the at least one cooling unit and the first heat exchange assembly to, at least in part, facilitate extraction of heat generated within the first electronics rack;
• providing a secondary coolant loop coupled in fluid communication with the at least one cooling unit disposed within the first electronics rack and coupled in fluid communication with the second heat exchange assembly disposed within the second electronics rack;
• and
• providing a controller to automatically control flow of cooled coolant from the at least one cooling unit in the first electronics rack to the second heat exchange assembly via the secondary coolant loop depending, at least in part, on cooling requirements of the first electronics rack.