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fluid and the flow rate is proportional to the rotational speed of the pump. This pump can also be used for the movement of highly viscous fluids but cannot be operated at speeds from a direct drive. This requires a universal joint to be added to supply the appropriate amount of torque to the system and to maintain a long life of the pump relative motion between the rotor and the drive shaft must be considered. This design is adapted into many different types of simple positive displacement pumps including piston-cylinder pumps and screw types [23]. Variable Speed Drives For each of the pumping types described, a variable speed drive (VSD) can be applied to the electric motor to control the speed and in turn the flow rate of the fluid. There are two types of system designs that are considered and dictate the control strategies for the pumping system. The first is a supply controlled system which removes incoming flow and are controlled to match the incoming flow rate received. This type of system can include flood protection schemes and discharging of process liquids. The second type is a demand controlled system which delivers fluid to a required process like a cooling water system. Both of these types of systems can be controlled by a constant speed pump when additional storage to the system is added, however a more effective and energy efficient method of controlling these pumps is to add a variable speed drive to reduce the pumping capacity with the demand to the system. To demonstrate the magnitude of energy that can be saved by the addition of a variable speed drive, pump affinity laws must be introduced. Because a pump is a moving device, head is generated. For a centrifugal pump this happens as the impeller is rotated. For positive displacement pumps this occurs as the screw rotates or the piston pushes the fluid from the cylinder. For a centrifugal pump, the flow rate is directly proportional to the rotational speed, the head is proportional to the rotational speed squared and the power consumption is 73PDF Image | TUDY OF LOW-GRADE WASTE HEAT RECOVERY
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