US 12,455,093 B2
Time-based energy efficient safe mode for freecooling unit
Amruta B. Jamdade, Chandannagar (IN); Rahul A. Gosavi, Pune (IN); and Abhijeet V Deshmukh, Pune (IN)
Assigned to Vertiv Corporation, Westerville, OH (US)
Filed by Vertiv Corporation, Westerville, OH (US)
Filed on Apr. 22, 2024, as Appl. No. 18/642,479.
Claims priority of application No. 202311031514 (IN), filed on May 3, 2023.
Prior Publication US 2024/0369254 A1, Nov. 7, 2024
Int. Cl. F24F 11/83 (2018.01); F24F 5/00 (2006.01); F24F 11/32 (2018.01); F24F 11/63 (2018.01); F25B 25/00 (2006.01); F25D 17/02 (2006.01); H05K 7/20 (2006.01)
CPC F24F 11/83 (2018.01) [F24F 5/0046 (2013.01); F24F 11/32 (2018.01); F24F 11/63 (2018.01); F25B 25/005 (2013.01); F25D 17/02 (2013.01); H05K 7/20709 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A controller device for a chiller system, comprising:
at least one memory configured for storing:
processor-executable encoded instructions;
at least one freecooling threshold;
and
one or more configuration time parameters;
one or more processors operatively coupled to the memory and to a chiller system for regulating at least one of a temperature or a humidity level of an enclosed environment, the chiller system comprising:
a fluid loop capable of circulating a fluid between the chiller system and the enclosed environment;
a direct refrigeration (DX) system configured for cooling the fluid loop, the one or more processors configured to activate the DX system when the chiller system is in a mechanical mode;
and
a freecooling (FC) system configured for cooling the fluid loop, the one or more processors configured to activate the FC system when the chiller system is in a freecooling mode;
wherein
the one or more processors are configured to:
receive an ambient temperature sensed by an ambient temperature sensor external to the environment;
receive a return water temperature (RWT) sensed by an RWT sensor disposed in the fluid loop, the RWT associated with the fluid returning to the chiller system from the environment via the fluid loop;
determine a delta between the ambient temperature and the RWT;
when the delta meets or exceeds the freecooling threshold, activate the freecooling mode;
detect a failure mode in at least one of the ambient temperature sensor or the RWT sensor;
when the failure mode is detected, transition the chiller system to a safe mode;
while the safe mode is engaged, activate at least one of the FC system or the DX system according to the one or more configuration time parameters.