[Dsg-rich] Cooling manifold test with 16-foot 1/2" OD line

[Amrit Yegneswaran]

thanks tyler, 
we see from your graph that ~600l/m is reached by about 50 psi, the graph is slightly different from the table . 
since the pressure differential between inside and outside is greater than a factor of 2, we assume throttled flow, which implies escape velocity of the air coming out of the orifice is mach1. 
we see this escape velocity gives ~60 l/m per orifice, so 600l/m can be handled by 2 mm OD holes. 
all of which is fine and dandy, but do we need 1,224 Kmph (760 mph) wind velocity from each hole. 
perhaps, increasing the hole diameter and reducing the velocity, while increasing the capacity for volume flow rate might be a good idea. 
but then again, why not have mach 1 speed winds howling in the volume! 
amrit 



From: "Tyler Lemon" <tlemon at jlab.org> 
To: "dsg-rich" <dsg-rich at jlab.org> 
Sent: Monday, October 2, 2017 4:27:10 PM 
Subject: [Dsg-rich] Cooling manifold test with 16-foot 1/2" OD line 

Hello, 

This afternoon, we repeated the test of the stainless steel manifold with a 16-foot 1/2" OD line. This replicates RICH's cooling system after the patch panels. 

The results are of the test are: 

Gas Panel pressure regulator setting [psi] 	flow measured [liters/min] 
10 	200 
20 	300 
30 	380 
40 	460 
50 	560 
60 	600+ 

As expected, with the shorter 1/2" OD line, we are able to reach at least 600 liters/minute of airflow. With the shorter line, we would also able to reach a higher flow rate (as shown in attached MYA Viewer plot). In the previous test with a 40-foot 1/2" OD line, the airflow maxed out at ~600 liters/minute. In today's test with a 16-foot 1/2" OD line, we had to use the manual rotameter to limit the flow to 600 liters/minute. 

We were able to read the airflow through the cRIO and EPICS. The attached MYA Viewer plot shows the airflow measured during the test. The parts where the signal increases and then flattens out corresponds to the time when the gas panel's regulator setting was changed. 

Despite being connected, we were not able to read the pressure in the gas system's air tank. We will debug the pressure signal tomorrow. 

Best regards, 
Tyler 

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