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Analyzing Pump Discharge Pressure Oscillation and Damper Function Under Varying Conditions

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This study investigates the oscillation of pump discharge pressure at varying discharge levels, noting that oscillations are absent at low pressures and emerge as pressure increases. Observations indicate a consistent oscillation frequency of approximately 3 Hz with a peak-to-peak amplitude of about 1 bar. The effects of a damper are examined with respect to temperature and heat load, revealing that a heated damper influences oscillation, while an unheated damper does not. Pressure measurements before and after a JT expansion valve show differences in oscillation behavior, indicating complex interactions in larger systems.

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Analyzing Pump Discharge Pressure Oscillation and Damper Function Under Varying Conditions

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Presentation Transcript

  1. Pressure oscillation and the damper function

  2. Oscillation of the pump discharge pressure Pressure [Bar] Time At certain low discharge pressure of the pump, there is no oscillation. With increase of the pressure, the oscillation starts. The frequency of the oscillation is about 3 Hz. The amplitude (p2p) is about 1 bar.

  3. Effect of the damper Temperature of the damper [˚C] Damper on (with heating) Pressure [Bar] Oscillation is due to not enough heat load in the dummy load. JT valve of the chiller is active. Damper off (without heating) Damper has no obvious effect on the damping of the oscillation.

  4. Test station connected with the large scale system From the large scale system To the large scale system

  5. Pressure measurement in the test station P1 P2 Time [s] • In the test station, the pressure P1 before the JT expansion valve still oscillates with the same frequency as the discharge pressure of the pump. Much less amplitude (25mbar) • After JT expansion, the pressure P2 has no oscillation. • It is possibly dampened by the JT expansion valve and the capillary connected with • the pressure sensors P1 and P2.

  6. Suction side pressure before the chiller PT1106 The suction side pressure PT1106 before the chiller of the large scale system has no oscillation too. It seems the oscillation has no effect on the pressure drop measurement along the test section. Time [s]

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