852-011200-003-L-230S

1 引言
　　随着电子组装技术的不断发展，电子设备的体积趋于微型化，系统趋于复杂化，高热密度成了一股不可抗拒的发展趋势。为了适应高热密度的需求，风扇、散热器等传统的散热手段不断推陈出新，新颖高效的散热方法层出不穷。在众多散热方式面前，区分各种散热方式的散热能力，从而选择既经济又可靠的散热方法成为设计人员极为关注的问题。本文针对风冷和水冷两种常用的散热方式，综合国内外文献中对这两种散热方式的研究结果，总结出这两种散热方式的散热能力，为热设计人员选择经济合理的散热方式提供参考依据。
2 各种传热方式的传热能力分析
　　各种传热方式传热系数的大致范围如附表所示［1］。对空气而言，自然风冷时的传热系数是很低的，最大为10w/（m2k），如果散热器表面与空气的温差为50℃，每平方厘米散热面积上空气带走的热量最多为0.05w。传热能力最强的传热方式是具有相变的换热过程，水的相变过程换热系数的量级为103～104。热管的传热能力之所以很大，就是因为其蒸发段和冷凝段的传热过程都是相变传热。

　　文献［2］给出了根据散热体积和热阻选择散热方式的参考依据，如图1所示。例如对于热阻要求为0.01℃/w的散热方式，如果体积限制在1000in3（1in3=16.4cm3），可以选择风冷散热方式，但必须配备高效的风冷散热器；而如果体积限制在10in3，只能选择水冷的散热方式。

3 风冷
　　风冷散热方式成本低，可靠性高，但由于散热能力小，只适用于散热功率小而散热空间大的情况下。目前风冷散热器的研究热点是将热管与散热器翅片集成在一起，利用热管的高传热能力，将热量均匀地传输到翅片表面，提高翅片表面温度的均匀性，进而提高其散热效率。
　　空气强制对流冷却方式是目前电力电子元件常用的散热方式，其普通结构是散热器加风扇的形式。该结构虽然实施方便，成本较低，但其散热能力有限。以intel pentium 4 cpu（2.2ghz）的冷却为例来说明普通风冷结构的散热范围。该cpu发热量约为55w，表面许可温度为70℃，芯片尺寸为12×12.5×1.5mm，热扩散铜板尺寸为31×31mm。散热器加风扇的限制安装空间为80×60×50mm。manish saini对该种情况下普通风冷结构的最大散热量做了实验研究［4］。采用icepak模拟表明，31×31mm热扩散铜板的热阻和16×16mm的铜板均匀加热时的热阻相等。实验方法是以一块面积为16×16mm、均匀加热的铜板为热源，采用普通散热结构。研究结果表明，当cpu的表面温度为70℃，周围空气温度为35℃，在80×60×50mm的散热空间内，风扇采用顶吹形式时最大散热量为89.4w，采用侧吹形式时最大散热量为78.2w。根据该实验数据分析，风扇顶吹时的热源的最大热流密度为34.9w/cm2，侧吹时热源的最大热流密度为30.5w/cm2。         咨询热线：18150695049
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ROSEMOUNT 3051CA1A02A1BH2B1I1M5P1DF0408
ROSEMOUNT 3051CD1A02A1BM5K8S5Q4Q8
ROSEMOUNT 3051CD1A22A1BB4I1
ROSEMOUNT 3051CD2A02A2AH2
ROSEMOUNT 3051CD2A02A2AH2
ROSEMOUNT 3051CD2A22A1BS2B41P10408
ROSEMOUNT 3051CG1A22A1BB404
ROSEMOUNT 3051S1TG3A2B11A1BB4B104
ROSEMOUNT 3144PD2A1/1B4M5
ROSEMOUNT 402-11-61
ROSEMOUNT 5601AE1P5B0NE
ROSEMOUNT 8711TTE010R1CDQ4
ROSEMOUNT 8711TTE010R1NAQ4PD
ROSEMOUNT 8712DR12NAM4
ROSEMOUNT 97337-76
ROSEMOUNT E1151 AP6S22
ROSEMOUNT E1151 DP4E22S2I1B1CM
ROSEMOUNT E1151 E110106
ROSEMOUNT E1151AP4S22
ROSEMOUNT E1151DP4J22
ROSEMOUNT E1151DP5S22
ROSEMOUNT E1151GDP4E22S2
ROSEMOUNT E1151GP4S22
ROSEMOUNT E1151GP6E12
ROSEMOUNT E1151GP6E12
ROSEMOUNT E1151GP6E12
ROSEMOUNT E1151GP6E22
ROSEMOUNT E1151GP6E22
ROSEMOUNT E1151GP7E22
ROSEMOUNT E1151LT5E22
ROSEMOUNT G1A22A2B4I1
ROSEMOUNT PWA01984-2518-0002
ROSEMOUNT R1144G0600A2211
ROSPEN LBC 2000
ROSPEN INDUSTRIES LTD ANI-1
ROSPEN INDUSTRIES LTD DIG 2
ROSPEN INDUSTRIES LTD DIG 2
ROSPEN INDUSTRIES LTD PROC-2
ROTOTHERM 656888/3
RS 101-8917
RS 114-8169
RS 139-209
RS 139-209
RS 160-284
RS 160-284
RS 160-284
RS 169-679
RS 191-7505
RS 207-302
RS 208-052
RS 209-9361
RS 219-4747
RS 219-5009
RS 221-342
RS 239-056
RS 239-062
RS 239-1061
RS 239-804
RS 240-696
RS 249-2445
RS 249-788
RS 250-1628
RS 251-1580
RS 251-1580
RS 251-1580
RS 260-779
RS 263-7862
RS 269-7359
RS 280-6513
RS 282-502
RS 290-6613
RS 297-2503
RS 300-5856
RS 305-989
RS 312-0113
RS 312-1857
RS 312-2951
RS 312-2951
RS 325-107
RS 325-703
RS 329-216
RS 329-222
RS 329-238
RS 332-234
RS 335-918
RS 343-789
RS 347-876
RS 348-605
RS 348-762
RS 348-829
RS 349-282
RS 350-377
RS 353-118
RS 365-1819
RS 376-470
RS 381-683
RS 388-4132
RS 403-875
RS 403-897
RS 403-904
RS 403-910
RS 403-954
RS 404-014
RS 412-065
RS 413-923
RS 413-923
RS 413-939
RS 413-939
RS 440-240
RS 444-3338
RS 444-3338
RS 446-3018
RS 451-6363
RS 451-6363
RS 478-9252
RS 507-450
RS 508-497
RS 508-510
RS 509-226
RS 512-581
RS 5440-352
RS 556 427
RS 596-618
RS 624-971
RS NHI11
RS XL2000-1-10
RS  346-463
RS COMPONENTS 603-328
RS PRO 794-8574
RTE 607175-05
RTE 607175-06
RTK P925TS
RTK P925TS-I
RTK P925TS-X
S&C CORP VARIOUS-4028
SAGINOMIYA DNS-D306X
SAGINOMIYA RGE-Z1N4-5
SAGINOMIYA SNS-C130XQ014
SAGINOMIYA SNS-C130XQ014
SAIA RAVH4021/1
SAMSON 21142152/00
SAMSON 22330015001/8127
SAMUEL STRAPPING SYSTEMS 40-703-00
SANGAMO
SAREL 87910
SAREL 87910
SATCHWELL ARE1301
SATRONIC MMG 810
SAUTER AK41P1 F003
SCHAEVITZ SENSORS P3081 10 WG
SCHAFFNER FN2020-10-06
SCHAFFNER FN2020-20-06
SCHAFFNER FN351-25-33
SCHALLER AUTOMATION 13220
SCHARCO NAS2W
SCHARCO NER3
SCHENK 2942454
SCHENK 8701297
SCHENK 3.560.104-031
SCHENK 4160297PB01
SCHLEICHER KZC220-110
SCHLEICHER SNO 1002
SCHLEICHER SNO 2010-17
SCHLEICHER SZA52-S
SCHLEICHER SZT320
SCHMERSAL 1096090
SCHMERSAL 10196090
SCHMERSAL 101172553
SCHMERSAL 60947-5-3
SCHMERSAL AZM160-23YRPKA
SCHMERSAL AZM161SK-12/12RK-024-2201
SCHMERSAL AZM161SK-12/12RKA-024
SCHMERSAL AZM170-11ZRK-2197
SCHMERSAL AZR31T2
SCHMERSAL AZR31T2
SCHMERSAL AZR31T2-24VDC
SCHMERSAL BNS 16-12ZV
SCHMERSAL BNS 16-12ZV
SCHNEIDER 75201840A
SCHNEIDER A9F54306
SCHNEIDER A9F54320
SCHNEIDER A9F54350
SCHNEIDER C60HC C16
SCHNEIDER C60HC C20
SCHNEIDER C60HD D16
SCHNEIDER LT3SA
SCHNEIDER LV432693
SCHNEIDER MGBN6
SCHNEIDER NSYSWSP
SCHNEIDER TSXFPP20
SCHNEIDER ELECTRIC LE1D35B7
SCHNEIDER ELECTRIC NKIT
SCHOTT DURAN 289766589
SCHRACK D40
SCHRACK PT57AT30
SCHRACK RA450 024
SCHRACK ZG550 024
SCHRADER BELLOWS 5008-042
SCHROFF 13100122
SELCOM ELETTRONICA 25.34902586
SELECT SEAL SSRI-63A
SEMATIC 8450
SEMIKRON SKT300/12E
SHIMPO DT-5AG
SHIMPO DT-5AG
SHINDENGEN GY05030G
SIBA 3001213.125
SIBA 5004101.8
SICK 1015993
SICK AD-ATM60-KA3PR
SICK AMS40-013
SICK C4MT-04224ABB03DE0
SICK CDM490-0001
SICK CLV410-0010
SICK CLV410-1010
SICK CLV410-2010
SICK CLV490-0010
SICK CLV490-1010
SICK CLV490-1010
SICK CM30-16BPP-KC1
SICK CVL490-0010
SICK DKS40-P5K02000
SICK LCUX1-400
SICK LGTN101-511
SICK LL3-TB01
SICK LL3-TB01
SICK NT6-04008S1
SICK VSPI-1R111
SICK WL12-3P2431
SICK WL160-F132
SICK WL160-F430
SICK WLL160T-F430
SICK WLL170-2P360
SICK WT12-P4381
SICK WT170-P410
SICK WT170-P410
SICK WTB12-3N1131
SICK OPTIC ELECTRONIC S30A-7111CP
SICK STEGMANN KUP-1010-B
SIEMENS 2411