Patent ID: 7849701

Claim:
A refrigeration system, comprising: a primary refrigeration loop configured to circulate a refrigerant through a first side of at least one heat exchanger; a secondary cooling loop configured to circulate a liquid coolant through a second side of the heat exchanger and through at least one refrigeration load; the secondary cooling loop including a suction header configured to receive the liquid coolant from the refrigeration load, and a discharge header configured to direct the liquid coolant to the heat exchanger, and at least one pump configured to pump the liquid coolant from the suction header to the discharge header; and a charging loop configured to maintain a pressure of the liquid coolant in the supply header within a predetermined range, the charging loop comprising: an inlet coupled to the discharge header and an outlet coupled to the suction header; a flow nozzle disposed between the inlet and the outlet, a valve disposed between the inlet and the outlet, and operable for movement between an open position to permit flow of liquid coolant through the flow nozzle, and a closed position to prevent flow of liquid coolant through the flow nozzle; and a primary reservoir for containing liquid coolant and communicating with the flow nozzle.