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ECU flow study and flow through PXL version 0 11/14/2013

ECU flow study and flow through PXL version 0 11/14/2013. Topics. Testing of AirInnovations ECU, air cooling system for the PXL detector. ECU flow measurements ECU Pressure vs Flow measurements Determination of expected PXL maximum cooling air flow with ECU

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ECU flow study and flow through PXL version 0 11/14/2013

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  1. ECU flow study and flow through PXLversion 0 11/14/2013

  2. Topics Testing of AirInnovations ECU, air cooling system for the PXL detector • ECU flow measurements • ECU Pressure vs Flow measurements • Determination of expected PXL maximum cooling air flow with ECU • ECU measurement of flow and pressure vs fan RPM

  3. Flow measurement with venturi meter and bag inflation The flow out of the ECU was measured with a pair of venturi meters using the setup shown ECU out This was checked against flow measured by the timed filling of a large plastic bag. Venturi mass flow meters

  4. Bag: 37 ft long, 280 ft3 The flow measurement was made using the setup on page 3 at two different blower speeds. The flows were 290 CFPM and 348 CFPM, the higher value was at the maximum blower speed of 5940 RPM Agreement between venturi meters and bag filling time is good to 2% to 3% The ECU front panel flow meter is way off. It reads a factor 2.4 to 3.4 too high.

  5. Measure of ECU pressure as a function of flow This set of measurements was made at full blower speed, 5940 RPM ECU output pressure measured here Flow was varied by adjusting restrictions at the exhaust. Pressure and flow values were recorded. Flow was determined using the two venturi mass flow meters.

  6. Measure of ECU pressure as a function of flow

  7. Determination of expected PXL maximum cooling air flow from the ECU When the PXL detector is inserted into the PST there will be additional back pressure due to the turning around of the air back in the opposite direction over the outside of the PXL cluster. The back pressure is expected to be 1 or 2 times the dynamic pressure, . There will, however, be a reduction in pressure if the venturi meters are removed. The measured flow in the setup shown is modified using the predicted back pressure according to the pressure vs flow fit shown in slide 6. The flow was measured with the setup shown at full blower RPM. Flow measured: 387 CFPM Flow predicted: 351-388 CFPM Requirement: 410-580 CFPM ECU Specification: 600 CFPM Thermal tests with real sectors will determine if the predicted flow is sufficient. PXL detector withdrawn from the PST.

  8. Measurement of ECU flow and pressure vs fan RPM These measurements were done using the setup shown in slide 3. The flow values were obtained using the venturi mass flow meters.

  9. Summary • The venturi mass flow meters provide a very accurate measure of flow • The ECU front panel flow meteris as much as 3.4 times the true flow • The ECU will only reach0.59 to 0.65 of the flow specification, however, this may be in part due to greater PXL back pressure than was estimated. This will be checked when PXL is installed in the PST. • Thermal tests with real sectors will be done to determine if the reduced performance of the ECU is sufficient for PXL cooling needs

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