Abstract: The fan synchronizer is a small flow tube 5, 2? IPS or smaller, connected between the supply fan 13 duct and return and/or exhaust fan 16 duct that allows flow through the tube 5 to issue a signal from an in line flow meter device 2 that will control the supply fan 13 and return/exhaust fan 16 to be synchronized to hold a set flow difference throughout the system flow range without series flow instability. The purpose is to maintain, in a variable flow system, a positive or negative building or room pressure difference to atmosphere, avoiding series flow instability of the fans.

Abstract: A method and apparatus for coupling a primary loop with a secondary loop for circulating processing fluids therebetween comprising in combination a first connection for the feed line of the primary loop and a second connection for the return line of the primary loop; a third connection for the feed line of the secondary loop and a fourth connection for the return line of the secondary loop; a crossover line coupling the four connections; first valve means for controlling the flow through the primary loop; first sensor means responsive to the flow across the crossover line to control the first valve means; second valve means in the path of flow through the crossover line; second sensor means responsive to the temperature of the process fluid in the secondary loop to control the second valve means; a common controller for the first and second sensor means adapted to control the first and second valve means as a function of the sensed temperature and flow; and a common controller for the first and second sensor

Abstract: A method and apparatus for controlling the flow of process fluids comprising a primary loop for process fluids; a plurality of secondary loops for the process fluids; a plurality of bridges, each coupling the primary loop with a secondary loop, each bridge having feed and return connections coupled to feed and return lines of the primary loop and feed and return connections coupled to feed and return lines of the secondary loop, and a crossover line coupling the primary and secondary loops; valve means for each bridge for controlling the flow of processing fluid through its associated second loop; microprocessor means for each bridge for adjusting its associated valve means; sensor means for each bridge for determining operating characteristic information of the processing fluid and for feeding such determined information to the microprocessor means; and a host computer coupling each of the microprocessor means in systems configuration.

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 se