Patent ID: 8711563

Claim:
A cooling unit comprising: at least one outdoor heat rejection unit, the at least one outdoor heat rejection unit being a dry heat rejection unit configured to reject heat from coolant passing through a coolant loop to outdoor air passing across the at least one heat rejection unit without water evaporation, and the at least one outdoor heat rejection unit comprising at least one heat exchange assembly coupled to the coolant loop for at least a portion of the coolant to pass therethrough; and an elevated outdoor coolant tank coupled in fluid communication with the at least one heat exchange assembly of the at least one outdoor heat rejection unit, the elevated outdoor coolant tank facilitating return of coolant to the coolant loop at a substantially constant pressure, wherein the elevated outdoor coolant tank is fixedly elevated above at least a portion of the coolant loop and fixedly elevated at least partially above the at least one at least heat exchange assembly of the at least one outdoor heat rejection unit.