peter.king@LIGO.ORG - posted 05:51, Wednesday 12 July 2017 - last comment - 06:39, Wednesday 12 July 2017(37459)
Flow rates for the HPO crystals
The following flow rates were measured with the calibrated flow meter. All are in litres/min. The data presented is: chiller display - Beckhoff chiller screen - measured flow rate - flow per crystal 22.6 22.6 17.46-17.71 4.40 (the current operating point) 21.3 21.4 16.60-16.85 4.18 24.5 24.6-24.7 19.30-19.53 4.85 26.0 26.0 20.56-20.78 5.17 28.0 28.0-28.1 22.21-22.48 5.59 29.8 29.7 23.56-23.95 5.94 JeffB / Peter
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I forgot to add the following ...
chiller flow - head 1 - head 2 - head 3 - head 4 - amp flow - power meter flow
21.3 0.56 0.53 0.51 0.56 1.78 1.72
22.6 0.59 0.55 0.54 0.59 1.83 1.77
24.5 0.64 0.60 0.58 0.64 1.95 1.80
26.0 0.67 0.63 0.61 0.67 2.02 1.83
28.0 0.72 0.67 0.65 0.72 2.13 1.88
29.8 0.75 0.70 0.68 0.76 2.21 1.90
At the time the measurements were taken, there was a miniscule leak in the flow meter but I do not
think it was large enough to skew the results.
So if we were to calculate the head flow rates from the available signals we would have
21.3 16.15 4.04
22.6 16.73 4.18
24.5 18.29 4.57
26.0 19.57 4.89
28.0 21.23 5.31
29.8 22.80 5.70
All of which are lower than those measured by the external flow meter. This reflects the -/+3%
accuracy of the turbine flow sensors.