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The largest loop in the system is the main loop which transports the energy from the energy storage tank to create domestic hot water, produce comfort heating for the offices and to heat the glue baths. This loop contains DOWTHERM G heating fluid to transport the energy and again, because of the high temperature of the supply fluid, the pump is located in the return piping. The most efficient pump found is an end suction centrifugal pump operating at one and a quarter horsepower and a 4.875 inch diameter impeller. The pump has a best efficiency point of 64.5% but at the design conditions is operating at 59% efficient. Figure 43 represents the loop system curve in blue with the current operating point outlined by the red arrow. This is placed on top of the selected pump curve to show the operating efficiency of the pump. Figure 44. Main Loop Pump and System Curve [50]. The final pump that must be selected is for the larger intermittent loop. This pump will only be in operation for a limited time throughout the day which should be taken into account when deciding what magnitude of electrical efficiency is required. The low operating hours will more than likely not justify any extensive control system to be implemented on top of the basics. The pump that is chosen for the first heat exchanger loop is a centrifugal two stage end suction pump operating at an efficiency of 64.4% with a 5.0625 inch impeller. The motor power requirements 106PDF Image | TUDY OF LOW-GRADE WASTE HEAT RECOVERY
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