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An industrial fluid circulation system and method has at least one fluid circulation circuit in an industrial process, such as an HVAC system. The at least one fluid circulation circuit includes a plurality of pumps, at least two of the pumps connected in parallel to circulate a fluid through the at

An industrial fluid circulation system and method has at least one fluid circulation circuit in an industrial process, such as an HVAC system. The at least one fluid circulation circuit includes a plurality of pumps, at least two of the pumps connected in parallel to circulate a fluid through the at least one fluid circulation circuit. A separate motor drives each pump and a speed control is used to vary the speed of each motor to thereby vary the pumping capacity of each parallel connected pump. A load detector is provided to sense operating loads on the system, and each operating pump runs at one of: a predetermined equal reduced speed, a predetermined almost equal reduced speed, and a predetermined similar reduced speed, relative to a maximum speed to thereby optimize pump motor power usage in accordance with system operating loads.

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1. An industrial fluid circulating system having at least one fluid circulation circuit with at least one of a fluid, a chilled water, a condenser water, and a boiler water circuit, the system including: at least one fluid treatment element in said at least one fluid circulation circuit, said at lea

1. An industrial fluid circulating system having at least one fluid circulation circuit with at least one of a fluid, a chilled water, a condenser water, and a boiler water circuit, the system including: at least one fluid treatment element in said at least one fluid circulation circuit, said at least one fluid treatment element including at least one of: a chiller in the case of one of: a single chilled water circuit anda primary chilled water circuit,a condenser in the case of a condenser water circuit,a boiler in the case of a boiler water circuit, anda system load,a plurality of pumps, at least two of said pumps connected in a parallel arrangement with each other and each pump of the parallel arrangement of said at least two of said pumps connected to a same one of said at least one fluid treatment element to circulate a fluid through said at least one fluid circulation circuit,a separate motor driving each pump,a speed control configured to vary a speed of each said motor to thereby vary a pumping capacity of each said pump,a load detector to sense operating loads on the system, anda controller to operate each said speed control,whereby said at least two of said parallel connected pumps operate simultaneously to circulate fluid through said at least one fluid treatment element, and each pump of said at least two of said pumps, connected in a parallel arrangement with each other that is operating in said at least one fluid circulation circuit runs at one of: a predetermined equal reduced speed,a predetermined almost equal reduced speed, anda predetermined similar reduced speed, relative to a maximum speed to thereby optimize pump motor power usage in accordance with system operating loads, said controller commanding each speed control to vary a speed of a respective motor to thereby vary the pumping capacity of a respective operating pump in accordance with at least one of: a system load,a predetermined target, andmanual judgement of skilled personnel. 2. The industrial fluid circulating system according to claim 1, wherein said at least one fluid circulation circuit is part of a cooling system, and said operating loads sensed by said load detector include a cooling load of said cooling system which is determined by measuring at least one of: present power consumption of at least one operating chiller compressor using a power sensor,speed of the at least one operating chiller compressor using a tachometer, anddischarged chilled water/boiler water temperature by a temperature sensor located in an appropriate location in the respective fluid circulation circuit. 3. The industrial fluid circulating system according to claim 1, wherein the controller controls operation of selected ones of a plurality of condenser water pumps, chilled water pumps and boiler pumps running at one of: a predetermined equal reduced speed,an almost equal reduced speed, anda similar reduced speed of a respective circuit relative to a maximum speed. 4. The industrial fluid circulating system according to claim 1, wherein the said controller operates each said speed control of the said at least two operating parallel connected pumps of the respective circuit in accordance with system loads to thereby control operation of selected ones of a plurality of condenser water pumps, chilled water pumps and boiler pumps running at one of: a predetermined equal reduced speed,an almost equal reduced speed, anda similar reduced speed relative to a maximum speed of the respective circuit and at a power setting that is a fixed ratio of current power ratio or loading of the cooling system. 5. The industrial fluid circulating system according to claim 1, wherein said speed control includes: a separate variable-speed drive circuit for powering each said pump;an arrangement, including said controller, for controlling the variable-speed drive circuits in response to at least one of: a present load on the system,an act responsive to a predetermined target, andmanual judgment of skilled personnel so as to regulate operation of the said pumps to simultaneously run at one of the predetermined: equal reduced speed,almost equal reduced speed, andsimilar reduced speed relative to a maximum speed. 6. The industrial fluid circulating system according to claim 1, wherein said at least one fluid treatment element in said at least one water circuit includes a variable capacity, compression type, chilled fluid cooling system comprising a single circuit chilled water system, said plurality of pumps comprising at least two chilled water pumps;a variable-speed drive circuit for powering each of the chilled water pumps;at least one chiller operatively coupled to a number of cooling loads and to a suction line leading back to said at least one chiller whereby water passing through said chiller in a heat exchange relationship is cooled;a device for varying the speed of each said motor driving each said pump;a sensor for sensing the temperature of water leaving said at least one chiller; andsaid controller operating the variable-speed drive circuit in response to the sensed operating loads on the system so as to regulate operation of the said at least two chilled water pumps to run simultaneously at one of: the equal reduced speed,the almost equal reduced speed, andthe similar reduced speed relative to a maximum speed. 7. An industrial fluid circulating system comprising: at least one fluid circulation circuit, wherein said at least one fluid circulation circuit includes a primary-secondary heat absorbing chilled water circuit having at least two chillers and at least two parallel connected primary chilled water pumps to circulate water through said primary chilled water circuit,at least two parallel connected secondary chilled water pumps to circulate water through said secondary chilled water circuit,a separate motor driving each said pump of the at least two primary chilled water pumps and each of the at least two secondary chilled water pumps,a speed control configured to vary the speed of each said motor to thereby vary a pumping capacity of each said pump, the speed control including at least one of: a variable-speed drive circuit for powering each said primary chilled water pump; anda variable-speed drive circuit for powering each said secondary chilled water pump;a load detector to sense operating loads on the system,the system further including:said at least two chillers being programmed so that at least one of the at least two chillers is operative during operation of the system, and at least one other of the at least two chillers is either operative or maintained shutdown and/or on standby in response to a predetermined loading condition: anda suction line leading back to said chillers;water passing through said chillers in a heat exchange relationship and being cooled;a controller to operate each said speed control;a leaving-water temperature sensor for sensing the temperature of cooled water leaving at least one of said operating chillers; andan arrangement associated with said controller for controlling the operating variable-speed drive circuits in response to at least one of: a system load,a predetermined target,manual judgement of skilled personnel, andthe sensed operating loads on an operating compressor, so as to regulate simultaneous operation of selected ones of the at least two primary chilled water pumps, and the at least two secondary chilled water pumps, running at one of a predetermined: equal reduced speed,almost equal reduced speed, andsimilar reduced speed of the respective circuit relative to a maximum speed to thereby optimize pump motor power usage in accordance with system operating loads. 8. An industrial fluid circulating system having at least one fluid circulation circuit with at least one of a fluid, a chilled water, a condenser water, and a boiler water circuit, wherein one of the at least one fluid circulation circuit is a heat rejection condenser water circuit, the system comprising: a condenser,a plurality of pumps, at least two of said pumps comprising condenser water pumps connected in a parallel arrangement with each other to circulate water through said condenser water circuit, anda separate motor driving each said pump,a speed control configured to vary the speed of each said motor to thereby vary a pumping capacity of each said pump,a load detector to sense operating loads on the system,said speed control including a variable-speed drive circuit for powering each condenser water pump;at least one chiller operatively coupled to a number of cooling towers and a suction line leading back to said at least one chiller;water passing through said at least one chiller in a heat exchange relationship and being heated;a leaving-water temperature sensor for sensing the temperature of heated water leaving said at least one chiller; andan arrangement including a controller for controlling the variable-speed drive circuits in response to the sensed operating loads on an associated operating compressor so as to regulate operation of the at least two operating condenser water pumps simultaneously running at one of a predetermined: equal reduced speed,almost equal reduced speed, andsimilar reduced speed relative to a maximum speed to optimize pump motor usage in accordance with system operating loads, said controller commanding each speed control to vary the speed of a respective motor to thereby vary the pumping capacity of a respective operating pump in accordance with at least one of: a system load,a predetermined target, andmanual judgement of skilled personnel. 9. A method of operating an industrial fluid circulating system having at least one fluid circulation circuit, comprising the steps of: providing a plurality of pumps to circulate fluid through said at least one fluid circulation circuit,connecting at least two of said pumps in a parallel arrangement with each other and connecting the parallel arrangement of said at least two of said pumps to circulate fluid through said at least one fluid circulation circuit,providing a separate motor for driving each pump,sensing operating loads on the system, andoperating said at least two of said parallel connected pumps to circulate fluid through said at least one fluid circulation circuit at all given power loads, andrunning each operating pump simultaneously at all given power loads, relative to a maximum speed, at one of: a predetermined equal reduced speed,a predetermined almost equal reduced speed, anda predetermined similar reduced speed to thereby optimize pump motor power usage in accordance with system operating loads. 10. The method according to claim 9, including the step of varying the speed of the operating pump motors to thereby vary the pumping capacity in accordance with at least one of: sensed system load,a predetermined target, andmanual judgment of skilled personnel. 11. The method according to claim 9, including the steps of circulating fluid through said at least one fluid circulation circuit with at least two pumps of at least similar capacity, and controlling the pump operation in accordance with at least one of: sensed system load,a predetermined target, andmanual judgment of skilled personnel. 12. The method according to claim 9, including the steps of setting an operational speed for each of the plurality of pumps that is operating to circulate fluid through said at least one fluid circulation circuit so that each pump of the respective circuit simultaneously runs at a substantially similar speed which is one of: a predetermined, equally reduced speed,an almost equal reduced speed, anda similarly reduced speed of the respective circuit, in response to at least one of:the system load,the predetermined target, andthe manual judgment of skilled personnel. 13. The method according to claim 9, including the steps of providing a system having at least one of a chilled water circuit, a condenser water circuit, and a boiler water circuit, circulating water through said at least one water circuit using said at least two of said pumps for each of said at least one water circuit and controlling the operation of each of said at least two of said pumps connected in a parallel arrangement with each other in accordance with at least one of: the system load,the predetermined target, andthe manual judgment of skilled personnel. 14. The method according to claim 12, including the steps of circulating water through at least two of said water circuits using a group of at least two parallel connected pumps for each of said at least two water circuits, and controlling the operation of each group of said at least two of said pumps connected in a parallel arrangement with each other in accordance with at least one of: the system load,the predetermined target, andthe manual judgment of skilled personnel. 15. The method according to claim 12, including the steps of circulating water through each of said water circuits using a group of at least two parallel connected pumps for each water circuit, and controlling the operation of each group of said at least two of said pumps connected in a parallel arrangement with each other in accordance with at least one of: the system load,the predetermined target, andthe manual judgment of skilled personnel. 16. The method according to claim 13, including the step of determining cooling system load of a chilled water circuit by measuring at least one of: present power consumption of at least one operating chiller compressor using a power sensor,speed of the at least one operating chiller compressor using a tachometer, anddischarged chilled water temperature by a temperature sensor located in an appropriate location in the chilled water circuit. 17. The method according to claim 13, including the steps of setting operation of selected ones of the plurality of condenser water pumps, chilled water pumps and boiler pumps running at one of: the predetermined equal reduced speed,the almost equal reduced speed andthe similar reduced speed of the respective circuit using at least one of:the system load,the predetermined target, andthe manual judgment of the skilled personnel. 18. An industrial fluid circulating system having a fluid circulation circuit comprising one of a single chilled water circuit, a primary chilled water circuit, a condenser water circuit and a boiler water circuit, the system including: at least one fluid treatment element in said fluid circulation circuit, said at least one fluid treatment element including one of: a chiller in the case of a single chilled water circuit or a primary chilled water circuit,a condenser in the case of a condenser water circuit,a boiler in the case of a boiler water circuit, anda system load,a plurality of pumps to circulate water through the fluid circulation circuit, said pumps being connected in a parallel arrangement with each other and each pump connected to a same one of said at least one fluid treatment element,a separate motor driving each pump,a load detector to sense operating loads on the system, anda speed control configured to vary a speed of each said motor to thereby vary a pumping capacity of each said pump, such that at any given load, at least two of said parallel connected pumps are operating to circulate fluid through said at least one fluid treatment element, and such that each pump that is operating in said at least one fluid circulation circuit runs simultaneously, relative to a maximum speed, at one of: a predetermined equal reduced speed,a predetermined almost equal reduced speed, anda predetermined similar reduced speed,the operation of the said at least two operating parallel connected pumps being controlled in accordance with at least one of: a system load,a predetermined target, andmanual judgement of skilled personnel.