Abstract: A closed loop cooling system for cooling machines, comprising a first heat exchanger having a refrigerant on a first side and a coolant on a second side and a coolant loop that circulates the coolant through the system; the coolant loop has a coolant supply header for circulating coolant flowing from the heat exchanger; a plurality of individual machine cooling loops connected to the coolant supply header, each machine cooling loop passing through at least one heat exchanger for cooling two or more fluids employed in an individual machine, and where each machine cooling loop has a flow meter and a regulating valve for adjustment of the coolant flow through the loop; and a coolant return header connected to the machine coolant loops for returning the coolant from the individual machine cooling loops to the first heat exchanger.

Abstract: A cooling system has an ethylene glycol coolant transport loop which is cooled by the existing plant ammonia based refrigeration system. The coolant loop employs ethylene glycol to transport heat between an ammonia evaporator and the hydraulic systems of individual machines. The ethylene glycol coolant is supplied from a supply header which is connected to a return side header by individual cooling loops which pass through the heat exchangers mounted on individual machines for cooling the machine hydraulic fluid. The supply header is also connected to the return header by a regulating valve set to maintain a constant pressure drop between the supply header and the return header. Each machine coolant fluid flow can be adjusted by a regulating valve which is adjusted by reference to a flow meter on a particular coolant loop.