Abstract: A method of controlling a hybrid adiabatic cooling system to cool an interior of a data center includes a step of cooling, by a hybrid adiabatic cooler, a first cooling liquid circulating from a return segment of an outer conduit loop to a feed segment of the outer conduit loop. The method includes a step of exchanging, by a direct liquid cooling unit, heat between a second cooling liquid and the first cooling liquid circulating in the outer conduit loop. The method includes a step of diverting a portion of the first cooling liquid circulating in the outer conduit loop to an inner conduit loop. The method includes a step of exchanging, by a room air handling unit, heat between indoor ambient air and the diverted portion of the first cooling liquid circulating in the inner conduit loop.

Abstract: A hybrid adiabatic cooling system for a data center includes an outer conduit loop including a feed segment and a return segment and an inner conduit loop fluidly coupled to the feed and return segments of the outer conduit loop. The hybrid adiabatic cooling system includes a hybrid adiabatic cooler fluidly coupled to the outer conduit loop to cool a first cooling liquid circulating from the return segment to the feed segment of the outer conduit loop. The hybrid adiabatic cooling system includes a direct liquid cooling unit fluidly coupled to the outer conduit loop and an air handling unit fluidly coupled to the inner conduit loop. The hybrid adiabatic cooling system operates in a free cooling mode when the outdoor air temperature is less than a first threshold temperature and a chiller mode when the outdoor air temperature is greater than the first threshold temperature.