US 12,372,277 B2
Method for controlling refrigerant liquid flood-back within a chiller and a system thereof
Sandeep Pasarkar, Thane West (IN); and Harshavardhan Kothavale, Thane West (IN)
Assigned to Blue Star Limited, Mumbai (IN)
Filed by Blue Star Limited, Mumbai (IN)
Filed on Apr. 3, 2023, as Appl. No. 18/129,978.
Claims priority of application No. 202221020324 (IN), filed on Apr. 4, 2022.
Prior Publication US 2023/0349603 A1, Nov. 2, 2023
Int. Cl. F25B 31/00 (2006.01); F25B 43/02 (2006.01); F25B 49/02 (2006.01)
CPC F25B 31/004 (2013.01) [F25B 43/02 (2013.01); F25B 49/02 (2013.01); F25B 2700/21151 (2013.01); F25B 2700/21152 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A method of operating a refrigeration system for a flooded-type chiller, the method comprising steps of:
compressing, by a scroll compressor, a refrigerant to a desired temperature and pressure;
separating, by an oil separator, an oil from the refrigerant exiting from the scroll compressor;
calculating, by a controller, a discharge superheat temperature of the refrigerant based on a discharge temperature of the refrigerant at an exit of the scroll compressor and a saturated discharge temperature of the refrigerant;
comparing, by the controller, an oil level in the scroll compressor virtually calculated by the controller with a predetermined threshold oil level; and
opening, by the controller, an oil return solenoid valve for a predetermined time based on the virtually calculated oil level in the scroll compressor to adjust flow of oil into the scroll compressor along with the oil from the oil separator, the oil return solenoid valve supplies the oil collected from a condenser and an evaporator of the refrigeration system.