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Heat Xfer/RadCon Progress20Oct2006
By
John Tang
Benton White
![Page 2: Heat Xfer/RadCon Progress 20Oct2006 By John Tang Benton White](https://reader035.vdocument.in/reader035/viewer/2022072015/56649ec55503460f94bcf736/html5/thumbnails/2.jpg)
Heat Xfer Requirements
• Max differential pressure:– Across Clinac=6psi– Across
chiller=4.1psi
• Flow rate across piping=4.3GPM
• 30kW heat dissapation req’d
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Heat Xfer Constraints
• Flexible tubing for piping – Fit in confined spaces– Allows for flexible placement of heat xfer
components
• Maintenance considerations– Access to essential components (ie: pump,
reservoir tank) easier– Isolation valves
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Vendor Candidates
VendorContact
InfoDimesion (in)
Weight (lbs)
PowerRequirements
Cooling Capacity
(kW)
Temp range (deg C)
Pressure available
for piping
Liebert1050 Dearborn
DrW 77x H 69.25
x D 38.5 750 2.2 pump kW 25.2 10 to 25 50 psi
PO Box 29186 460V 60 Hz 3 phase
Columbus, OH
43229 208/230V
800-877-9222
ThermoNESLAB 800-258-0830
W 12.6 x H 23.5 x D 20.9 120
115V, 60Hz, 15 Amps 1.25 5 to 35
www.thermo.com
/
or 230V, 50Hz, 8 Amps
Ambient 13 to 35C
55 to 95F
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Pipe Flow Analysis2
( )2L
L vh f k
D g
_
/
_ _
Lh headloss
f friction factor
Llength diameter
Dk pipebend loss coefficients
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Pipe Flow Analysis (cont.)
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Pipe Flow Analysis (cont.)
• Use Moody Diagram to find friction factors• Find Reynold’s Number, Re
ReDv
D=DiameterV=fluid velocityρ= fluid densityμ= dynamic fluid
viscosity
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Pipe Flow Analysis (cont.)
• Use of headloss calculations can be used to find differential pressure in piping
LhP
hL=headloss in piping
ν= specific volume of fluid
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Pipe Flow Analysis (cont.)
• Determine mass flow rate of fluid
m Av V _ _
_
_
m mass flow rate
A area
v fluid velocity
density
V volumetric flowrate
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RadCon Calcs
• See excel spreadsheet
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RadCon
• Safe operating distance for x-ray dose rate is 9km.
2
1
1( ) ( )p x ray m x ray
mD D
r