Apparatus and method are provided for facilitating cooling of an
electronics rack employing a closed loop heat exchange system. The closed
loop heat exchange system includes a first heat exchanger, a second heat
exchanger, and a coolant distribution loop connecting the first heat
exchanger and the second heat exchanger. When operational, the coolant
distribution loop allows coolant to circulate between the first heat
exchanger and the second heat exchanger. The closed loop heat exchange
system couples to the electronics rack with the first heat exchanger
disposed at an air inlet side of the electronics rack, and the first heat
exchanger and the second heat exchanger disposed in different
inlet-to-outlet air flow paths through the electronics rack to reduce an
imbalance in air flow temperature of the different inlet-to-outlet air
flow paths through the electronics rack.