Heat exchanger and technique for cooling a target space and/or device via stepped sequencing of multiple working fluids of dissimilar saturation temperatures to provide condensation-by-vaporization cycles

A method for cooling a target space, the method comprising:

• providing a first heat exchanger within the target space to absorb heat from within the target space using a first working fluid that is flowing through the first heat exchanger, the target space comprising an immersion cooling tank that holds heat generating components submerged in an immersion cooling liquid within a lower portion of the immersion cooling tank;
• wherein the first heat exchanger comprises pipes in fluid communication with a condenser that is physically located within an upper portion of the immersion cooling tank, wherein the immersion cooling liquid evaporates within the tank to generate immersion cooling vapor that rejects heat to the first working fluid flowing through the condenser and condenses and returns to a lower volume of the tank as liquid condensate;
• circulating the first working fluid egressing via a first conduit from the first heat exchanger to be re-utilized within the first heat exchanger by passing the egressing first working fluid through a second heat exchanger that has a second working fluid flowing through a separate, second conduit;
• providing at least one third heat exchanger that is physically coupled to a second conduit through which the second working fluid vapor passes after absorbing the heat from the first working fluid vapor, wherein the third heat exchanger includes a third working fluid flowing in liquid form through the third heat exchanger outside of the second conduit and which in response to absorbing ambient heat from the second working fluid as the second working fluid vapor and the third working fluid in liquid form come into proximity with each other within the third heat exchanger, evaporates to create third working fluid vapor;
• wherein the second saturation temperature of the second working fluid is greater than a third saturation temperature of the third working fluid to cause a heat exchange between the two working fluids to result in at least a partial condensation of the second working fluid and at least a partial vaporization of the third working fluid;
• and
• enabling the third working fluid egressing from the third heat exchanger to be cooled via one or more of a fourth heat exchanger, a reservoir, and the atmosphere before circulating the third working fluid back to the third heat exchanger;
• wherein a respective thermodynamic property of the first, second and third working fluids provides a saturation temperature that causes paired coupling of one or more of (a) the first working fluid vapor with a liquid form of the second working fluid, the first working fluid vapor with a liquid form of the third working fluid, and the second working fluid vapor with a liquid form of the third working fluids to result in condensation of the specific working fluid vapor and vaporization of at least a portion of the liquid form of the working fluid paired with the specific working fluid vapor within the corresponding heat exchanger.