EPAC Software. COLDPLATE Example. Serpentine Example
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1 Serpentine Example This example builds a model of a 3 pass (serpentine) cold plate shown below. The example demonstrates how to add a new cooling fluid and how to account for the added pressure drop of cooling lines and quick disconnects that are attached to cold plate. In addition, this example accounts for heat infiltration from an external environment. The cold plate design parameters are listed below: Add the cooling fluid listed in the table below. The aluminum cold plate has 3003 aluminum fins with a.062 thick 6061-T6 thick base and.04 thick cover. The fin style is ¼-11.1 (interrupted - lanced and offset), they are.375 and 10 fins per inch and.006 inches thick. Inlet fluid temperature is 37 at 60 PSI and 1.8lb/min. The surrounding air temperature is 150C with an effective forced convection coefficient of h=.018w/(in^2- C). Assume for now, 500 Watts of power is uniformly dissipation on the cold plate base. There is 36 inches of 3/8 coolant tubing prior to the quick disconnect which has an effective loss coefficient of 3.6. There is a quick disconnect at either end. Account for the 36 inches of tubing. Copyright EPAC-INC.COM FOR MORE INFORMATION, VISIT OUR WEB SITE: EPAC-INC.COM Tel: (603)
2 The new fluid is defined first, with the properties are taken from the previous table. Copyright EPAC-INC.COM FOR MORE INFORMATION, VISIT OUR WEB SITE: EPAC-INC.COM Tel: (603)
3 Input the geometry parameters on this tab. Copyright EPAC-INC.COM FOR MORE INFORMATION, VISIT OUR WEB SITE: EPAC-INC.COM Tel: (603)
4 The base plate, cover and fin properties are defined here. The aluminum selected for the design are already built into the material library, so they only need to be picked from the drop down list. Copyright EPAC-INC.COM FOR MORE INFORMATION, VISIT OUR WEB SITE: EPAC-INC.COM Tel: (603)
5 Input the Inlet fluid temperature, pressure, mass flow rate and select Mystery Fluid as the cooling fluid. Copyright EPAC-INC.COM FOR MORE INFORMATION, VISIT OUR WEB SITE: EPAC-INC.COM Tel: (603)
6 The 500 Watts of power are added here. Copyright EPAC-INC.COM FOR MORE INFORMATION, VISIT OUR WEB SITE: EPAC-INC.COM Tel: (603)
7 The Inlet Section button is selected to specify both the 36 inches of tubing and the quick disconnect just prior to the cold plate. In addition, the Exit Section button is selected to specify the quick disconnect just after the exit from the cold plate. Copyright EPAC-INC.COM FOR MORE INFORMATION, VISIT OUR WEB SITE: EPAC-INC.COM Tel: (603)
8 The Inlet Section 36 inches of tubing and quick disconnect parameters are input here. The Exit Section parameters are quick disconnect input here. Copyright EPAC-INC.COM FOR MORE INFORMATION, VISIT OUR WEB SITE: EPAC-INC.COM Tel: (603)
9 The heat infiltration from the external environment is input here. Copyright EPAC-INC.COM FOR MORE INFORMATION, VISIT OUR WEB SITE: EPAC-INC.COM Tel: (603)
10 Definition of the 3 passes for the serpentine path and for the number of nodes along with and length are defined below. It is that simple. Copyright EPAC-INC.COM FOR MORE INFORMATION, VISIT OUR WEB SITE: EPAC-INC.COM Tel: (603)
11 The isothermal results are shown below; they are always calculated prior to the non-isothermal analysis and are used as input to the non-isothermal analysis. ################################################################### HEATING ON ONE SIDE ONLY ************************* VARIABLE INPUTS ************************** THE TYPE OF FINS SPECIFIED ARE: 1/ FIN HEIGHT, INCHES BASE THICKNESS, INCHES FIN THICKNESS, INCHES FIN DENSITY, FINS PER INCH 10.0 STATIC INLET FLUID TEMPERATURE, DEG C 37.0 INLET PRESSURE, LBS/IN MASS FLOWRATE, LBS/MIN 1.80 THE POWER APPLIED TO ONE SIDE ONLY, WATTS INSULATION THICKNESS, INCHES EXTERNAL AMBIENT AIR TEMPERATURE, DEG C THE COOLING FLUID IS: MYSTERY FLUID **************** INTERMEDIATE CALCULATED PARAMETERS **************** FREE FLOW CROSS SECTIONAL AREA, IN HYDRAULIC DIAMETER, INCHES COLDPLATE WEIGHT, LBS 0.83 TOTAL VOL FLOWRATE, [GAL/MIN] FT3/MIN [ 0.2] 0.03 COLDPLATE VOL FLOWRATE, [GAL/MIN] FT3/MIN [ 0.2] 0.03 COLDPLATE VELOCITY, FT/SEC 0.14 REYNOLDS NUMBER 6. EQUIVALENT FRICTION LOSS COEFFICIENT, KFRICTION INLET LOSS COEFFICIENT, KINLET 0.83 EXIT LOSS COEFFICIENT, KEXIT FILM COEFFICIENT, [BTU/(HR-FT2-F)] W/(IN2-C) [ 50.09] THE FIN EFFICIENCY WITH HEAT ON ONE SIDE ONLY IS CONVECTION HEAT LOAD, WATTS *************************** PRESSURE ******************************* INLET PRESSURE, LB/IN INLET PRESSURE DROP, LB/IN ACCELERATION PRESSURE DROP, LB/IN FRICTIONAL PRESSURE DROP, LB/IN EXIT PRESSURE DROP, LB/IN FLOWLOSS INLET PRESSURE DROPS, LB/IN FLOWLOSS EXIT PRESSURE DROPS, LB/IN TOTAL PRESSURE DROP, LB/IN EXIT PRESSURE, LB/IN ************************ THERMAL RESISTANCE ************************ THERMAL RESISTANCE FROM INLET FLUID TO COLDPLATE, C/W THERMAL RESISTANCE FROM LOCAL FLUID TO COLDPLATE, C/W ************************** TEMPERATURES **************************** STATIC INLET FLUID TEMPERATURE, DEG C 37.0 STAGNATION FLUID TEMP RISE ALONG COLDPLATE, DEG C 26.0 TOTAL STAGNATION FLUID TEMP RISE, DEG C 26.0 STATIC EXIT FLUID TEMPERATURE, DEG C 63.0 ISOTHERMAL COLDPLATE TEMPERATURE, DEG C 68.3 MAXIMUM COLDPLATE TEMPERATURE, DEG C 77.6 Copyright EPAC-INC.COM FOR MORE INFORMATION, VISIT OUR WEB SITE: EPAC-INC.COM Tel: (603)
12 The temperature at each node on the cold plate and fluid are calculated and shown below. The power on each node is also shown. INLET FLUID TEMPERATURE= 37.0 C V CP TEMP V FLD TEMP POWER NODE NO EXT. AMB. TEMP= V ( 37.5) ( 37.6) ( 37.7) ( 53.3) ( 53.7) ( 54.2) ( 54.7) ( 55.2) ( 55.6) N 1 N 2 N 3 N 4 N 5 N 6 N 7 N 8 N ( 38.1) ( 38.2) ( 38.3) ( 52.9) ( 54.9) ( 55.3) ( 55.8) ( 56.2) ( 56.1) N 10 N 11 N 12 N 13 N 14 N 15 N 16 N 17 N ( 38.6) ( 38.7) ( 39.0) ( 52.6) ( 54.4) ( 56.6) ( 57.0) ( 56.7) ( 56.6) N 19 N 20 N 21 N 22 N 23 N 24 N 25 N 26 N ( 39.2) ( 39.3) ( 39.6) ( 52.2) ( 54.0) ( 56.1) ( 57.4) ( 57.2) ( 57.1) N 28 N 29 N 30 N 31 N 32 N 33 N 34 N 35 N ( 39.7) ( 39.8) ( 40.2) ( 51.8) ( 53.6) ( 55.7) ( 57.9) ( 57.6) ( 57.5) N 37 N 38 N 39 N 40 N 41 N 42 N 43 N 44 N ( 40.2) ( 40.4) ( 40.8) ( 51.4) ( 53.2) ( 55.3) ( 58.3) ( 58.1) ( 58.0) N 46 N 47 N 48 N 49 N 50 N 51 N 52 N 53 N ( 40.7) ( 40.9) ( 41.4) ( 51.0) ( 52.7) ( 54.8) ( 58.7) ( 58.5) ( 58.5) N 55 N 56 N 57 N 58 N 59 N 60 N 61 N 62 N ( 41.3) ( 41.5) ( 42.0) ( 50.6) ( 52.2) ( 54.3) ( 59.1) ( 59.0) ( 58.9) N 64 N 65 N 66 N 67 N 68 N 69 N 70 N 71 N ( 41.8) ( 42.0) ( 42.6) ( 50.2) ( 51.8) ( 53.9) ( 59.5) ( 59.4) ( 59.4) N 73 N 74 N 75 N 76 N 77 N 78 N 79 N 80 N 81 Copyright EPAC-INC.COM FOR MORE INFORMATION, VISIT OUR WEB SITE: EPAC-INC.COM Tel: (603)
13 ( 42.3) ( 42.5) ( 43.1) ( 49.7) ( 51.3) ( 53.4) ( 59.9) ( 59.9) ( 59.8) N 82 N 83 N 84 N 85 N 86 N 87 N 88 N 89 N ( 42.8) ( 43.1) ( 43.7) ( 49.3) ( 50.8) ( 52.9) ( 60.3) ( 60.3) ( 60.3) N 91 N 92 N 93 N 94 N 95 N 96 N 97 N 98 N ( 43.3) ( 43.6) ( 44.2) ( 48.8) ( 50.3) ( 52.3) ( 60.7) ( 60.7) ( 60.7) N100 N101 N102 N103 N104 N105 N106 N107 N ( 43.8) ( 44.1) ( 44.8) ( 48.3) ( 49.8) ( 51.8) ( 61.0) ( 61.1) ( 61.2) N109 N110 N111 N112 N113 N114 N115 N116 N ( 44.4) ( 44.6) ( 45.3) ( 47.8) ( 49.3) ( 51.3) ( 61.4) ( 61.6) ( 61.6) N118 N119 N120 N121 N122 N123 N124 N125 N ( 44.9) ( 45.1) ( 45.8) ( 47.3) ( 48.8) ( 50.7) ( 61.8) ( 62.0) ( 62.1) N127 N128 N129 N130 N131 N132 N133 N134 N ( 45.4) ( 45.6) ( 46.3) ( 46.8) ( 48.3) ( 50.1) ( 62.1) ( 62.4) ( 62.5) N136 N137 N138 N139 N140 N141 N142 N143 N ( 45.9) ( 46.1) ( 46.6) ( 47.2) ( 47.7) ( 49.6) ( 62.4) ( 62.8) ( 62.9) N145 N146 N147 N148 N149 N150 N151 N152 N ( 46.3) ( 46.8) ( 47.3) ( 47.8) ( 48.4) ( 49.0) ( 62.8) ( 63.2) ( 63.4) N154 N155 N156 N157 N158 N159 N160 N161 N162 FLUID TEMPERATURE OUT= 63.1 V V CONVECTION HEAT LOAD= AVERAGE COLDPLATE TEMP.= 65.7 POWER DIRECTLY ON CP= NO. OF ITERATIONS REQUIRED= 68 ALLOW. NO. OF ITERATIONS= 1000 TEMP. RELAXATION CRITERIA= PERCENT ENGERY BALANCE= V Copyright EPAC-INC.COM FOR MORE INFORMATION, VISIT OUR WEB SITE: EPAC-INC.COM Tel: (603)
14 A color contour plot of the cold plate and cooling fluid temperatures is shown below. Copyright EPAC-INC.COM FOR MORE INFORMATION, VISIT OUR WEB SITE: EPAC-INC.COM Tel: (603)
15 Copyright EPAC-INC.COM FOR MORE INFORMATION, VISIT OUR WEB SITE: EPAC-INC.COM Tel: (603)
16 Detailed Pressure Drop Results at each Section 36 inches of tubing, quick disconnects and cold plate are listed on the next page. They are contained in the.dlp file. Copyright EPAC-INC.COM FOR MORE INFORMATION, VISIT OUR WEB SITE: EPAC-INC.COM Tel: (603)
17 Copyright EPAC-INC.COM FOR MORE INFORMATION, VISIT OUR WEB SITE: EPAC-INC.COM Tel: (603) Results for Class Work #6 - continued SUMMARY OF INPUTS AND RESULTS FOR ISOTHERMAL ANALYSIS AND MAXIMUM TEMPERATURE FOR NONISOTHERMAL ANALYSIS ***************************************************** LEGEND ********************************************************************** FTYPE FIN STYLE FLOWS FLUID TEMP 1 RECTANGULAR FINS F FIN (CONVOLUTED) V VOLUME-FT^3/MIN 1 AIR S SINGLE SIDED HEATING TRI. FINS P PIN FIN v VOLUME-GAL/MIN 2 WATER B BOTH SIDED HEATING 3 PF4 PIN FINS M MASS FLOW-LB/MIN 3 COOLANOL20 4 PF9 PIN FINS T RESULTING LB/MIN (TEMP CP) 4 COOLANOL /8 WAVY FINS E RESULTING LB/MIN (TEMP OUT) 5 EG_H2O_60/ /8 WAVY FINS P RESULTING LB/MIN (DELTA P) 6 EG_H2O_50/ /8 WAVY FINS R RESULTING LB/MIN (RAM FLOW) 7 EG_H2O_40/60 8 3/ L & O FINS 8 EG_H20_30/70 9 1/ L & O FINS TEMPERATURE = DEGREE C 9 FC / L & O FINS DIMENSIONS = INCHES 10 GALDEN-HT / L & O FINS WEIGHT = LBS 11 HFE / L & O FINS PRESSURE DROP = IN-H20 FOR AIR, LB/IN2 FOR LIQUIDS 12 HFE TRI FIN 12.00T 13 JP5 14 TEST 14 JP8 15 PLANE FIN LIQUID_R134A 16 PG_H2O_20/80 17 POLYALPHAOLEPHIN 18 SKYDROL PG_H2O_50/50 20 ENGINE OIL 21 MYSTERY FLUID A NUMBER FOLLOWED BY A DASH (-) INDICATES THIS VARIABLE IS NOT USED DURING THIS RUN FLOWLOSS INPUT AND RESULTS DATA - PRESSURE DROP RESULTS ***************************************************** LEGEND ********************************************************************** UNITS COMMENTS WIDTH OR DIA - INCHES AREA-IN - SQ. INCHES 1 THE FRICTION FACTOR f IS MULT. BY 4 WITHIN COLDPLATE HEIGHT - INCHES ALT - FEET 2 DP-KI/KE INCLUDES THE AREA CHANGE EFFECT LENGTH - INCHES T-XXX - DEGREE C M-DOT - LB/MIN P-XXX - LB/IN2 RHO-XXX - LB/FT3 ARAMI - SQ. INCHES DP-XXX - IN-H2O FOR AIR, LB/IN2 FOR LIQUIDS PRESS-X - IN-H20 FOR AIR, LB/IN2 FOR LIQUIDS EPAC Software
18 Copyright EPAC-INC.COM FOR MORE INFORMATION, VISIT OUR WEB SITE: EPAC-INC.COM Tel: (603) ****************************************** INPUT *********************************************************** RESULTS ********************* FIN STYLE TEMP FTYPE FHEIGHT FTHICK FDENSITY ITHICK TEMPIN TEMPAMB TEMPWALL FLOWS FLUID TEMPOUT TCPISO TCPMAX DELTAP WEIGHT TMAX/NODE PDIA PSPACET PSPACEL F F M S 68.3S 77.6S **************** INPUT ********************************************************* RESULTS ***************************************** INLET FLOWLOSS INPUT AND RESULTS DATA WIDTH OR DIA HEIGHT LENGTH K M-DOT f RHO-IN RHO-EX MACH-IN MACH-EX DP-ACC DP-f DP-K DP-TOT PRESS-I PRESS-E SUB-TOTALS THE TOTAL PRESSURE DROP ACROSS THE INLET IS COLDPLATE FLOWLOSS INPUT AND RESULTS DATA WIDTH OR DIA HEIGHT LENGTH K IN/EX M-DOT f RHO-IN RHO-EX MACH-IN MACH-EX DP-ACC DP-f DP-KI/KE DP-TOT PRESS-I PRESS-E EXIT FLOWLOSS INPUT AND RESULTS DATA WIDTH OR DIA HEIGHT LENGTH K M-DOT f RHO-IN RHO-EX MACH-IN MACH-EX DP-ACC DP-f DP-K DP-TOT PRESS-I PRESS-E SUB-TOTALS THE TOTAL PRESSURE DROP ACROSS THE EXIT IS ************************************************************************* ACCELERATION TOTAL FRICTIONAL TOTAL FITTING OR TURN TOTAL THE TOTAL PRESSURE DROP ACROSS THE WHOLE SYSTEM IS *********************************************************************** EPAC Software
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