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LIQUID COOLING Liquid Cold Plates For High-Performance Components & Systems ................................................ 116–117 Exposed Tube Liquid Cold Plates .................................... 118–119 Full Buried Tube Liquid Cold Plates ................................ 120–122 Liquid cooling is a natural evolution beyond air cooling where either due to thermal requirements or footprint requirements, the desired performance can no longer be economically met by air cooling.  There are many ways to accomplish liquid cooling, but the most common method is to have a plate with a flow path that moves liquid under the devices. After the heat is absorbed into the liquid, it is taken out of the plate and into the larger system. While water or water/glycol are the most common fluids used in liquid cooling, gasoline, oil, and refrigerant are other fluids that can be utilized.  There are lots of ways to construct a cold plate and the methods can be driven by the level of performance needed, the materials needed or the environmental requirements. One construction method is to use a series of cross drilled holes in a plate. The holes intersect in the plate to determine the flow pattern and unneeded patterns are plugged. This construction method can be cost effective, but the pattern is limited to straight lines.  Another method is to embed a tube in a plate by machining a groove in the plate. The tube can either be placed toward the top surface of the plate to provide better cooling to devices mounted on that surface, or it can be embedded further into the plate so that it cools devices mounted on both sides of the plate. This option provides greater flexibility, but the thermal performance is limited because of the surface area of the tube perimeter. To get more performance, extended surface area in contact with the fluid is required and this to form some flow passages and then a cover is assembled to capture the flow. The extended surface area can be machined in place or installed by use of a piece of folded fin. The cover can be flat or be another machined plate. The method of assembly of the two parts can be done by gasket/screw, glue/screw, brazing, or welding and is dependent on the required performance and the requirements of the environment. LIQUID COOLING leads to machined cold plates. The cold plate is constructed of a plate that has been machined LIQUID COOLING LIQUID COOLING LIQUID COLD PLATES FOR HIGH-PERFORMANCE COMPONENTS & SYSTEMS 180-10 & 180-11 SERIES Standard P/N 180-10-6C 180-10-12C 180-10-24C 180-11-6C 180-11-12C 180-11-24C LIQUID COLD PLATES FOR RECTIFIERS AND POWER DIODES Cold Plate Body Nominal Dimensions Length “A” Width Thickness Channel Width in. (mm) in. (mm) in. (mm) in. (mm) 6.000 (152.4) 3.000 (76.2) 0.625 (15.9) 1.250 (31.8) 12.000 (304.8) 3.000 (76.2) 0.625 (15.9) 1.250 (31.8) 24.000 (609.6) 3.000 (76.2) 0.625 (15.9) 1.250 (31.8) 6.000 (152.4) 5.000 (127.2) 0.688 (17.5) 1.813 (46.1) 12.000 (304.8) 5.000 (127.2) 0.688 (17.5) 1.813 (46.1) 24.000 (609.6) 5.000 (127.2) 0.688 (17.5) 1.813 (46.1) Overall Length Overall Thermal Resistance in. (mm) (Plate to Inlet Water) 13.406 (340.5) 0.084°C/W @ 1.5 GPM 19.406 (429.9) 0.041°C/W @ 1.5 GPM 31.406 (797.7) 0.020°C/W @ 1.5 GPM 13.688 (347.7) 0.084°C/W @ 1.5 GPM 19.688 (500.1) 0.041°C/W @ 1.5 GPM 31.688 (804.9) 0.020°C/W @ 1.5 GPM General Purpose Weight lbs. (grams) 0.850 (385.56) 1.700 (771.12) 2.900 (1315.4) 1.500 (680.40) 2.867 (1300.47) 5.730 (2599.13) Material: Aluminum, no finish. Tubing: Copper (stainless steel tubing available on special order). CL to CL Device Spacing Inches 1.0 (25.4) 2.0 (50.8) 3.0 (76.2) Flow - GPM ½ 1 2 0.59 0.40 0.29 0.52 0.36 0.26 0.48 0.33 0.24 3 Standard P/N 180-12-6C 180-12-12C 180-12-24C 180-20-6C Cold Plate Body Nominal Dimensions Length “A” Width Thickness in. (mm) in. (mm) in. (mm) 6.000 (152.4) 7.750 (196.9) 0.658 (16.7) 12.000 (304.8) 7.750 (196.9) 0.658 (16.7) 24.000 (609.6) 7.750 (196.9) 0.658 (16.7) 6.000 (152.4) 5.500 (139.7) 0.690 (17.5) Mounting Surfaces Single Single Single Double 180-12 & 180-20 SERIES Overall Length in. (mm) 13.406 (340.5) 19.406 (429.9) 31.406 (797.7) 13.125 (333.4) 4 0.47 0.46 0.32 0.31 0.23 0.22 CL to CL Device Spacing Inches 1.0 (25.4) 2.0 (50.8) 3.0 (76.2) Overall Thermal Resistance (Plate to Inlet Water) 0.038°C/W @ 1.0 GPM 0.018°C/W @ 1.0 GPM 0.009°C/W @ 1.0 GPM 0.038°C/W @ 1.0 GPM Weight lbs. (grams) 2.270 (1029.67) 4.300 (1950.48) 8.600 (3900.96) 1.090 (494.42) PERFORMANCE CHARACTERISTICS LOCAL THERMAL RESISTANCE PER DEVICE PLATE TO INLET WATER (°C/WATT) PERFORMANCE CHARACTERISTICS LOCAL THERMAL RESISTANCE PER DEVICE PLATE TO INLET WATER (°C/WATT) LIQUID COLD PLATES FOR RECTIFIERS, DIODES, AND POWER MODULES General Purpose Flow - GPM ½ 1 2 0.76 0.58 0.42 0.67 0.49 0.34 0.62 0.43 0.30 3 4 0.59 0.57 0.40 0.39 0.28 0.27 MECHANICAL DIMENSIONS 180-12 SERIES MECHANICAL DIMENSIONS 180-10 SERIES Standard P/N 180-10-6C 180-10-12C 180-10-24C 180-11-6C 180-11-12C 180-11-24C 116 6.000 in. (152.4) 12.000 in. (304.8) 24.000 in. (609.6) 6.000 in. (152.4) 12.000 in. (304.8) 24.000 in. (609.6) Standard P/N 180-12-6C 180-12-12C 180-12-24C 180-20-6C 180-20 SERIES 180-11 SERIES Dimensions: in. (mm) Length “A” in. (mm) wakefield-vette.com Dimensions: in. (mm) Contact us: (603) 635-2800 Length “A” in. (mm) 6.000 in. (152.4) 12.000 in. (304.8) 24.000 in. (609.6) 6.000 in. (152.4) 117 LIQUID COOLING LIQUID COOLING EXPOSED TUBE LIQUID COLD PLATES PART NUMBER 120455 Wakefield-Vette’s exposed tube liquid cold plates ensure minimum thermal resistance between the power device and the cold plate by placing the coolant tube in direct contact with the power device’s base. Direct contact reduces the number of thermal interfaces between device and fluid thus increasing performance for the application. Part Number Description 120455 Exposed Tube 2- Pass Cold plate 120456 Exposed Tube 4- Pass Cold plate 120457 Exposed Tube 4- Pass Cold plate 120458 Exposed Tube 6- Pass Cold plate 120459 Exposed Tube 6- Pass Cold plate 120460 Exposed Tube 6- Pass Cold plate 2-PASS THERMAL PERFORMANCE "X" Dimension Inches Passes Figure N/A 2 1 6.00 4 2 12.00 4 2 6.00 6 3 12.00 6 3 24.00 6 3 MECHANICAL DIMENSIONS KEY SPECIFICATIONS • Base Plate: Extruded Aluminum. • Copper Tube Material: .0375″ OD x .049″ wall. • Thermal Epoxy fill with high thermal conductivity. EPOXY COPPER TUBE PART NUMBER 120456 & 120457 BASE PLATE MECHANICAL DIMENSIONS 4-PASS THERMAL PERFORMANCE 6-PASS THERMAL PERFORMANCE PART NUMBER 120458, 120459, & 120460 MECHANICAL DIMENSIONS Custom Exposed Tube Liquid Cold Plates Available Contact Wakefield-Vette for more information or visit www.wakefield-vette.com 118 119 LIQUID COOLING LIQUID COOLING FULL BURIED TUBE LIQUID COLD PLATES PART NUMBER 120959 Wakefield-Vette’s fully buried tube liquid cold plates have the ability to cool both sides of the cold plate because of it’s positioning within the base plate. Another key feature of the fully buried tube is that it is not exposed to the outside environment. Some engineers prefer the epoxy layer above the tube to protect the tube from leakage. Part Number Description 120959 Fully Buried Tube 2- Pass Cold plate 120960 Fully Buried Tube 4- Pass Cold plate 120961 Fully Buried Tube 4- Pass Cold plate 120962 Fully Buried Tube 6- Pass Cold plate 120963 Fully Buried Tube 6- Pass Cold plate 120964 Fully Buried Tube 6- Pass Cold plate 2-PASS THERMAL PERFORMANCE "X" Dimension Inches Passes Figure N/A 2 1 6.00 4 2 12.00 4 2 6.00 6 3 12.00 6 4 24.00 6 5 MECHANICAL DIMENSIONS KEY SPECIFICATIONS • Base Plate: Extruded Aluminum. • Copper Tube Material: .0375″ OD x .049″ wall. • Thermal Epoxy fill with high thermal conductivity. EPOXY COPPER TUBE PART NUMBER 120960 & 120961 BASE PLATE MECHANICAL DIMENSIONS 4-PASS THERMAL PERFORMANCE 6-PASS THERMAL PERFORMANCE PART NUMBER 12062 MECHANICAL DIMENSIONS Custom Full Buried Tube Liquid Cold Plates Available Contact Wakefield-Vette for more information or visit www.wakefield-vette.com 120 121 LIQUID COOLING FULL BURIED TUBE LIQUID COLD PLATES PART NUMBER 120963 MECHANICAL DIMENSIONS PART NUMBER 120964 MECHANICAL DIMENSIONS 122