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Windage Losses Rotor Cavity Reduced Pressure Ball Bearing Trust Load Capability Thrust load transducer Thrust load Generated Figure 3-3: Issues associated with the PM rotor windage losses, ball bearing thrust capability, labyrinth seal leakage, and pump-out vanes on the compressor wheel are required for thrust balancing. The Haskel 8AGD-5 gas booster pumps that are used to reduce the cavity pressure are shown in Figure 3-5. These pumps use compressed air to reduce the rotor cavity pressure and then discharge the compressed CO2 back into the loop. The pumps are also water cooled, which will help lower the pumping power required to operate these pumps. The pumping power is determined by the leakage mass flow rate multiplied by the change in enthalpy required to pump the fluid from ~200 psia to the return pressure which is approximately 1120 psia. Of course this enthalpy change depends on the inlet temperature to the Haskel pump and the pump efficiency. The maximum Haskel pump inlet temperature is estimated to be 320 K, but could be substantially different depending on the amount of cooling provided to the housing and whether or not the rotor cavity is heated by magnetic losses. For the purposes of determining the Haskel pump pumping power, the pump inlet temperature is bounded by the lowest inlet temperature available which is 295 K (approximately the cooling water inlet T) and by our estimate for the highest temperature which is 320 K. The pump efficiency is estimated to be 85%. The S-CO2 loop utilizes two types of Haskel pumps during fill and operation. The pump used to fill the loop is an ALG-15 air driven liquid pump. This pump is operated with compressed air and is water cooled. The maximum allowable working pressure for this pump is 2500 psig. The loop also uses two 8AGD-5 Haskel pumps to pull down the rotor cavity pressure and return this gas to loop pressure downstream of the compressor. These pumps are also air driven and air cooled. Their maximum allowable working pressure is 2500 psig. 27 Labyrinth Seal By Compressor Leakage Flow WheelPDF Image | Operation and Analysis of a Supercritical CO2 Brayton Cycle
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