Abstract

A system for cooling a flow of air at a plurality of sites comprising a process water chiller subassembly, a plurality of air cooling subassemblies, a primary loop for process water extending between the process water subassembly and the plurality of air cooling subassemblies, means to effect a flow of air to be cooled across the secondary loops at the sites to be cooled, a plurality of water bridges, each coupling the primary loop with a secondary loop, each water bridge having feed and return connections coupled to the feed and return lines of the primary loop and feed and return connections coupling feed and return lines of a secondary loop, and a crossover line coupling the primary and secondary loops, a pressure responsive valve in the path of flow through the primary loop and a flow sensor for each waterbridge to determine the flow in its crossover line for controlling the pressure responsive valve, a temperature responsive valve in the crossover line for each waterbridge and a temperature responsive sensor responsive to the temperature of the process water in the secondary loop, a common controller for each waterbridge adapted to modify its valves as a function of the sensed temperature and flow, and a host computer coupling the common controllers in systems configuration for controlling the common controllers.