Peregrine Cooling Systems - The Racks
Image copyright Hewlett Packard Enterprise
Each Peregrine rack contains 72 dual-node trays and uses water to keep the components cool. Some racks, called Cooling Distribution Units (CDUs), are dedicated to providing a clean and consistent water supply to the compute racks. Running vertically in the center of each rack is a device called the water wall, which directly contacts the node heat pipes to transfer heat to the isolated server cooling loop. Water constantly flows through the water wall to remove the heat generated by the nodes.
Each CDU contains a water pump, vacuum pump, and liquid-to-liquid heat exchanger, with connections to the isolated server cooling loop and facility water loop. The CDU regulates the supply water to the racks to maintain a consistent temperature into the racks and out to the facility water loop through the heat exchanger. The CDU also holds a vacuum on the isolated server cooling loop so that if a leak develops, air is drawn into the loop and detected rather than releasing water.
In the next installment of this series, we will elaborate on the facility water loop and energy recovery systems.