Cool fluid reservoir for a coolant distribution unit

A coolant distribution unit (CDU) comprising:

• a closed fluid loop;
• a circulation pump connected to the closed fluid loop for pumping a cool fluid in the closed fluid loop;
• and
• a cool fluid reservoir disposed in a cool fluid flow path defined by the closed fluid loop, comprising:
• a cylinder having an internal volume defined between an inlet and an outlet, and a first opening;
• a hollow piston slidably connected to the cylinder via one of the inlet or the outlet to split the internal volume into a first volume portion that is filled with the cool fluid and a second volume portion that is filled with a driver fluid;
• and
• a driver fluid assembly comprising a driver pump coupled to the cylinder via the first opening, wherein the first opening is formed on a section of the cylinder that corresponds to the second volume portion,
• wherein the first volume portion is fluidically connected to the closed fluid loop via the hollow piston and another one of the inlet or the outlet to allow a continuous flow of the cool fluid into the closed fluid loop via the cool fluid reservoir, wherein the driver pump pumps the driver fluid into the second volume portion via the first opening to slidably drive the hollow piston along a first direction to reduce the first volume portion and inject a portion of the cool fluid from the first volume portion into the closed fluid loop for managing loss of the cool fluid in the CDU based on an operating pressure of the cool fluid at a pump-inlet of the circulation pump.

A method comprising:

• directing a flow of a cool fluid in a closed fluid loop of a coolant distribution unit (CDU) via a cool fluid reservoir comprising a cylinder having an internal volume defined between an inlet and an outlet, and a hollow piston slidably connected to the cylinder via one of the inlet or the outlet to split the internal volume into a first volume portion that is filled with the cool fluid and a second volume portion that is filled with a driver fluid,
• wherein the first volume portion is fluidically connected to the closed fluid loop via the hollow piston and another one of the inlet or the outlet,
• wherein the second volume portion is fluidically connected to a driver pump of a driver fluid assembly via an opening formed on a section of the cylinder that corresponds to the second volume portion of the cylinder such that the driver fluid assembly is fluidically connected to the second volume portion, wherein the driver pump pumps the driver fluid into the second volume portion via the opening, and
• slidably driving the hollow piston by the driver fluid to reduce the first volume portion and inject a portion of the cool fluid from the first volume portion into the closed fluid loop for managing loss of the cool fluid in the CDU based on an operating pressure of the cool fluid in the closed fluid loop.