Multi-phase change thermal management systems for servers

A data center system, comprising:

• a plurality of immersion cooling systems to provide immersion cooling to a plurality sets of information technology (IT) equipment, wherein each of the immersion cooling systems comprises:
• an immersion tank to contain a set of one or more information technology (IT) equipment at least partially submerged into a liquid phase of a first phase change fluid within the immersion tank, the IT equipment including one or more processors representing one or more severs, wherein, when the IT equipment operates, the IT equipment generates heat that is transferred to the first phase change fluid thereby causing at least some of the liquid phase of the first phase change fluid to turn into a vapor phase;
• a condenser unit having a second phase change fluid circulating at the condenser unit, the condenser unit comprising:
• a vacuum port;
• and
• a sealing valve at the vacuum port to seal in a pressure at the condenser unit;
• and
• a vapor-to-liquid heat exchange core, coupling the immersion tank to the condenser unit to carry the heat from the first phase change fluid to the second phase change fluid, wherein the vapor-to-liquid heat exchange core is to condense the first phase change fluid from the vapor phase to the liquid phase.