the other guys nh cfd_aa
TRANSCRIPT
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TM
HIGH POWER BGA PROCESSORTHERMAL modeling
with N.h. cfd tools
A few Sample Cases
D. Blanchet 04/14/2005
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TMTHERMAL modeling NEW TOOL EVALUATIONAir coolingConduction cooling Heat pipes TE coolers TransientLiquid Flow through cold platesNatural ConvectionDetailed Package study
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TMHEAT PIPE STUDYHigh temperature primary heat path
Heat pipes ON
Heat sink
+ 55C
CAB
Cold plate
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TMLow temperature primary heat paths
CAB
Heat pipes OFF (frozen)
- 40C wall
standoffs
Cold plate
startup heater
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TMresults hot ambient
Heat pipes operating
Sink attached to chassis wall
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TMresults hot ambient
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TMresults cold ambient -40C
frozen
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TMresults cold ambient -40C
frozen
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TM
Typical Transient Heating curves heater power only warm up time
•9
Cell @ 0C ~ 820 sec
Total heater power = 250W
Ambient - 40C
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TM
Conductioncooled
8 modules
6U CC6 modules
Heat Rejection Unitsection
(optional)Not
ConsideredIn this study
3 Cold plates(series)
inlet
outlet
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TM
Chassis walls - 3 cold plates in series – 2.2 KW
800 w
800 w300 w
300 win
out
8 – CCModules @~200W each
6 – CC 6UModules @~100W each
20Cwater
@1 gpm
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TM
Coolant temperature rise ~ 7C @ 1 gpm
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TM
Component Model parameters
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TM6U module Model
Air flow Copper heat sinks
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TMModel top view
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TMModel mesh – 340,000 cells
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TMResults –
Typical temperature profile cross section
Air velocity vectors
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TMResults -
Air velocity vectorsThrough heat sinks
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TMResults – temperature contours section through heat sink bases
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TM
junction temperature predictions @ sea level
AIRFLOW >> 12 CFM 15 CFM 18 CFM 25 CFMPower per processor 0.8” pitch 0.8” pitch 0.8” pitch
35W – 178W total Inlet Tj / outlet Tj Inlet Tj / outlet Tj Inlet Tj / outlet Tj
Inlet air 20C 60 / 80 56 / 74 53 / 69Inlet air 40C 80 / 100 76 / 94 73 / 89Inlet air 55C 95 / 115 91 / 109 88 / 104Power per processor 1.0” pitch 1.0” pitch 1.0” pitch 1.0” pitch
35W – 178W total Inlet Tj / outlet Tj Inlet Tj / outlet Tj Inlet Tj / outlet Tj Inlet Tj / outlet Tj
Inlet air 20C 58 / 73 54 / 66 51 / 61 47 / 54Inlet air 40C 78 / 93 74 / 86 71 / 81 67 / 74Inlet air 55C 93 / 108 89 / 101 86 / 96 82 / 89
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TM
Liquid Cooled Module Studies
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TM
Serpentine Liquid Flow Path & Temperature Contours
Commercial Processor Design ~260 Watts Total
Laminar flow Nr ~ = 1100 (viscous fluid)
35C0.25 gpm
90CAt spec limit
100 W
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TMParallel channel cold plate 6U
6 CPUs @ 90W ea540 Watts one side
35C Water @ 0.33 gpm
Straightmanifolds
MilledParallel
channels
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TMLocal mesh control – parallel channels
5 cells per channelCoarser grid
In metal frame
390,000 grid cells
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TMCold plate
Full 2 Resistor < j-b / j-c > component models(detailed models available)
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TMParallel flow results
Backview
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TMResults - Tj
Tj = 58.2C
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TMDetailed model
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TMDetailed CPU BGA model
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TMDetailed model
1,360,000 grid cells
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TMDetailed model bga
1,360,000 grid cells
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TMDetailed model – wind tunnel
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TMDetailed model
pwb
Heat sink
BGA
Air flow