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2 Two Phase Rack Level Liquid Cooling Solution Lentis Pai/Associate Director/Wiwynn
3 A g e n d a Existing Chassis Level Solution Wiwynn Two Phase Immersion Cooling Rack Level Liquid Cooling Solution Overview Investigation of Single Phase & Two Phase Advantage Next Investigation Schedule
4 E x i s t i n g C h a s s i s L e v e l S o l u t i o n Enhanced Volume Air Cooling Flexible Solution Patent Loop Heat Pipe Air Water Assisted Air Cooling Air Thermosiphon Water + Air Air
5 W i w y n n T w o P h a s e I m m e r s i o n C o o l i n g Two Phase Immersion Cooling 48Vdc High Power Efficiency High Capacity Usage Board Matrix in Tank Sled POC Project White Paper Boiling 48Vdc ~February 2018 POC Design POC Schedule April 2018 POC Prototyping May 2018 POC Test
6 C u r r e n t L i m i t a t i o n Chassis Level High Power ASICs are in demand with limited space Water Cooling Water leakage is concerned in rack Immersion Cooling Power dissipating ability is enhanced with data center facility change
7 C omplementary Solution Chassis Level Rack Level More Space Limited Space Fan Wall
8 C omplementary Solution Water Cooling Dielectric Fluid Water Leakage Freeze Minimum Risk Corrosion
9 C omplementary Solution Immersion Cooling Two Phase Liquid Assisted Air Cooling Facility & Serviceability Change High Heat Transfer No Change
10 C o m p l e m e n t a r y S o l u t i o n Two Phase Liquid Assisted Rack Level Air Cooling More space No data center facility change Dielectric fluid with minimum leakage concern High heat transfer ability of latent heat of vaporization Advantages drive us to investigate
11 A g e n d a Existing Chassis Level Solution Wiwynn Two Phase Immersion Cooling Rack Level Liquid Cooling Solution Overview Investigation of Single Phase & Two Phase Advantage Next Investigation Schedule
12 R a c k L e v e l L i q u i d C o o l i n g O v e r v i e w RDHx with Fan (Rear door heat exchanger) Heat Source System Heat Source Coolant In RDHx (with Fan) Pump Rack Coolant Out Systems Working Fluid Dielectric Liquid (3M Engineering Fluid) PUMP Radiator Fan Wall
13 I n v e s t i g a t i o n o f S i n g l e P h a s e a n d T w o P h a s e Single Phase Cooling Power Optimization Dielectric Fluid (3M Engineering Fluid) Water vs. Dielectric Fluid Low Liquid Flow Rate Two Phase Uniform Temperature Flow Management
14 L i q u i d C o o l i n g L o o p ( S i n g l e P h a s e ) QA RDHx (with Fan) Pump COLD LIQUID HOT LIQUID QL Tin Cold Plate Hot ASIC Heat, W
15 I n v e s t i g a t i o n C o o l i n g P o w e r O p t i m i z a t i o n QA RDHx (with Fan) QA Tin QL QA Power Tin Tin QL QA QL Power Pump COLD HOT Keep a target ASIC temperature LIQUID LIQUID QL Tin Optimize QA and QL by Cold Plate Cold Plate cooling power perspective Hot ASIC Heat, W
16 Fan Power I n v e s t i g a t i o n C o o l i n g P o w e r O p t i m i z a t i o n ( E x p e r i m e n t ) QA 0 QA 1 QA 2 QA 3 QA 4 QL 0 QL 1 QL 2 QL 3 QL 4 Tin with minimum cooling power Liquid Pump Power Tin: Cold Liquid Temperature ( o C) Condition: 250W Heat source at 25 o C ambient temperature, target heat source case temperature = 55 o C
17 L i q u i d C o o l i n g L o o p ( T w o P h a s e ) Tb QA RDHx (with Fan) LIQUID with Pump LIQUID Boiling VAPOR BUBBLE QL Cold Plate Liquid with Tb vapor bubble Hot ASIC Heat, W Tb: Boiling Temperature
18 I n v e s t i g a t i o n D i e l e c t r i c F l u i d v s W a t e r Fluid Phase Heat Source Power Liquid Flow Rate Air Flow Rate Heat Source Case Temperature Water Single Phase 400W 0.3 L/min 26CFM 68.2 Dielectric Fluid (3M, FC-72) Two Phase 400W 0.3 L/min 26CFM 63.5 Liquid boiling point=56 o C
19 Heat Source Case Temperature ( o C) I n v e s t i g a t i o n L o w L i q u i d F l o w R a t e 80 Single Phase Two Phase Heat Source Temperature Liquid with vapor Low Liquid Flow Requirement 6 Smaller Pump/ Low-cost Pump Liquid Flow Rate (L/min) 4 2 Liquid Pump Power (W) Liquid boiling point=56 o C Boiling
20 I n v e s t i g a t i o n U n i f o r m T e m p e r a t u r e RDHx (with Fan) Water (Single Phase) Cold Liquid Water Hot Liquid ASIC 1< ASIC 2 (Single Phase) ASIC 1 ASIC 2 Warm Hot ~Tb RDHx (with Fan) Tb Dielectric Fluid (Two Phase) Liquid Dielectric Fluid (Two Phase) Liquid + Vapor ASIC 1 ASIC 2 ~Tb Tb Tb ASIC 1 ASIC 2 Warm Warm More Uniform Temperature
21 R a c k F l o w M a n a g e m e n t High Workload System 1 QA1 High Workload System 2 QA1 Low Workload System 3 QA2 Pump Low Workload System 4 Idle System 5 QA2 QA3 RDHx (with Fan) Rack
22 I n v e s t i g a t i o n F l o w M a n a g e m e n t High Workload 200W Two Phase Case = 64.2 o C High Workload 200W Two Phase Case = 61.0 o C Valve 100% Open Low Workload 100W Single Phase Case = 54.9 o C Rack Flow Management Low Workload 100W Two Phase Case = 61.0 o C Valve 50% Open RDHx (with Fan) Pump RDHx (with Fan) Pump
23 A g e n d a Existing Chassis Level Solution Wiwynn Two Phase Immersion Cooling Rack Level Liquid Cooling Solution Overview Investigation of Single Phase & Two Phase Advantage Next Investigation Schedule
24 A d v a n t a g e Minimum Leakage Concern No Facility Change Two Phase Rack Level Liquid Cooling High Heat Transfer Uniform Temperature
25 I n v e s t i g a t i o n s Two Phase Cold Plate Boiling Enhancement Flow Management Efficiency Optimization Pressure Control Low Loop Pressure Blind Mate Tube Easy Connection Cost Reduction Commercialization
26 F l e x i b l e H e a t T r a n s f e r Liquid Rear Door Heat Exchanger (RDHx) Fan Wall Air Liquid Heat Exchanger Facility Liquid Loop Liquid
27 C o n c l u s i o n High Data Center Facility Change Immersion Cooling Serviceability Change Wiwynn Same Facility Two Phase Rack Level Rack Level Two Liquid Dielectric Cooling Fluid Solution Same Serviceability Minimum Risk of Leakage Low Chassis Level Solution Limited Space
28 S c h e d u l e Q White Paper Publishing ~Q Rack Prototyping
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