US 9,811,097 B2
Environmental control of liquid cooled electronics
Ravi K. Arimilli, Austin, TX (US); Michael J. Ellsworth, Jr., Lagrangeville, NY (US); and Edward J. Seminaro, Milton, NY (US)
Assigned to DARPA, Arlington, VA (US)
Filed by Ravi K. Arimilli, Austin, TX (US); Michael J. Ellsworth, Jr., Lagrangeville, NY (US); and Edward J. Seminaro, Milton, NY (US)
Filed on Apr. 16, 2009, as Appl. No. 12/425,210.
Prior Publication US 2010/0263855 A1, Oct. 21, 2010
Int. Cl. G05D 23/00 (2006.01); G05D 23/19 (2006.01)
CPC G05D 23/1931 (2013.01) 13 Claims
OG exemplary drawing
 
1. A system for controlling liquid-cooled electronics, said system comprising:
an electronics rack including at least one heat-generating electronics subsystem;
at least one Modular Cooling Unit (MCU) associated with said electronics rack and configured to provide system coolant to said at least one heat-generating electronics subsystem for facilitating cooling thereof, wherein each MCU includes a liquid-to-liquid heat exchanger, a first coolant loop and a second coolant loop, and shares an air-to-liquid heat exchanger; and
a system controller coupled to at least one control valve that controls a flow of system coolant that passes through said liquid-to-liquid heat exchanger and coupled to at least one isolation valve that further controls a flow of the system coolant through the air-to-liquid heat exchanger, wherein said system controller is configured to:
determine a first set point temperature, Ta, wherein said Ta is based on a dew point temperature, Tdp, of a computer room;
determine a second set point temperature, Tb, wherein said Tb is based on a facility chilled liquid inlet temperature, Tci, and a rack power, Prack, of an electronics rack;
select a MCU set point temperature, Tsp, for the MCU such that power efficiency of the system is increased while ensuring that said Tsp does not fall below said Tdp, wherein said Tsp is selected to be the higher value of said Ta and said Tb;
regulate said control valve responsive to said selected Tsp; and
in response to determining that a temperature of the system coolant is out of specification, control the isolation valve to shut off the flow of the system coolant to the air-to-liquid heat exchanger.