Coolant distribution unit and control system

A high density liquid cooling system, the system comprising:

• an enclosure having an enclosed spatial envelope of no more than 800 mm wide, 1200 mm deep, and 2200 mm high;
• and
• a coolant distribution unit housed by the enclosure, the coolant distribution unit including:
• primary loop piping, the primary loop piping including:
• a primary loop bypass circuit;
• and
• a three-way valve configured to selectively allow flow through the primary bypass circuit;
• secondary loop piping, the secondary loop piping including:
• a first pump and a second pump;
• and
• a pump inlet system in fluid communication with the first and second pumps to provide inlet flow to the first and second pumps in parallel;
• a heat exchanger in fluid communication with the primary loop piping and the secondary loop piping to transfer heat from a secondary coolant within the secondary loop piping to a primary coolant within the primary loop piping;
• a primary loop sensor configured to sense at least one of a temperature, a pressure, a heat load, or a flow rate of the primary coolant;
• a secondary loop sensor configured to sense at least one of a temperature, a pressure, a heat load, or a flow rate of the secondary coolant;
• and
• a control system including one or more processor devices configured to control the three-way valve and at least one of the first and second pumps to control flow of fluid through the heat exchanger based on one or more of a sensed temperature, a sensed pressure, a sensed heat load, or a sensed flow rate.