收藏本站
Reading a Thermal Performance Graph
The performance graphs you will see in this
catalog (see graph 579802) are actually a
579802
Air Velocity—Feet Per Minute
CONVERTING VOLUME
TO VELOCITY
composite of two separate graphs which
have been combined to save space. The small
arrows on each curve indicate to which axis
the curve corresponds. Thermal graphs are
published assuming the device to be cooled
is properly mounted and the heat sink is in
100
80
60
40
20
0
0
200
400
600 800
1000
20
16
12
8
4
0
Although most fans are normally rated and
compared at their free air delivery at zero
back pressure, this is rarely the case in most
applications. For accuracy, the volume of
output must be derated 60%–80% for
the anticipation of back pressure.
its recommended mounting position.
0
1
2 3 4
5
Heat Dissipated—Watts
EXAMPLE: The output air volume
of a fan is given as 80 CFM. The output area
GRAPH A
GRAPH B
Air Velocity—Feet Per Minute
is 6 inches by 6 inches or 36 in 2 or 25 ft 2 .
To find velocity:
100
80
0
200
400
600 800
1000
20
16
Velocity (LFM) =
Volume (CFM)
area (ft 2 )
Velocity = = 320
60
40
20
12
8
4
80
0.25
Velocity is 320 LFM, which at 80%,
0
0
1
2 3
4
5
0
derates to 256 LFM.
Heat Dissipated—Watts
GRAPH A is used to show heat sink perform-
ance when used in a natural convection envi-
ronment (i.e. without forced air). This graph
starts in the lower left hand corner with the
horizontal axis representing the heat dissipa-
tion (watts) and the vertical left hand axis
representing the rise in heat sink mounting
surface temperature above ambient (°C). By
knowing the power to be dissipated, the
temperature rise of the mounting surface
can be predicted. Thermal resistance in natu-
ral convection is determined by dividing this
temperature rise by the power input (°C/W).
EXAMPLE A: Aavid Thermalloy part number
579802 is to be used to dissipate 3 watts of
power in natural convection. Because we are
dealing with natural convection, we refer to
graph “A”. Knowing that 3 watts are to be dis-
sipated, follow the grid line to the curve and
find that at 3 watts there is a temperature
rise of 75°C. To get the thermal resistance,
divide the temperature rise by the power
dissipated, which yields 25°C/W.
* Linear feet per minute
** Cubic feet per minute
GRAPH B is used to show heat sink per-
formance when used in a forced convec-
tion environment (i.e. with forced air flow
through the heat sink). This graph has its
origin in the top right hand corner with
the horizontal axis representing air velocity
over the heat sink LFM* and the vertical
axis representing the thermal resistance of
the heat sink (°C/W). Air velocity is calculat-
ed by dividing the output volumetric flow
rate of the fan by the cross-sectional area
of the outflow air passage.
Velocity (LFM)* = Volume (CFM)**
area (ft 2 )
EXAMPLE B: For the same application
we add a fan which blows air over the heat
sink at a velocity of 400 LFM.
The addition of a fan indicates the use of
forced convection and therefore we refer
to graph “B”. This resistance of 9.50°C/W is
then multiplied by the power to be dissi-
pated, 3 watts. This yields a temperature
rise of 28.5°C.
DESIGN ASSISTANCE
Aavid Thermalloy can assist in the design
of heat sinks for both forced and natural
convection applications. Contact us for help
with your next thermal challenge. For more
information, visit our web site at:
www.aavidthermalloy.com
AMERICA
USA Tel: +1 (603) 224-9988 email: info@aavid.com
ASIA
Singapore Tel: +65 6362 8388 email: sales@aavid.com.sg
www.aavidthermalloy.com
EUROPE
Italy Tel: +39 051 764011 email: sales.it@aavid.com
United Kingdom Tel: +44 1793 401400 email: sales.uk@aavid.com
Taiwan Tel: +886(2) 2698-9888 email: sales@aavid.com.tw
11
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
77199-003 77199-3-MODJACK
780-10063-00200 CBL KEYBRD EXT MINI 6PIN M-F 2M
788422-2 CONN TERMINATOR IDC 68POS PLASTC
79100-075-4F1 CABLE FLAT 4COND 19AWG 100M
79100-075-4FLT CABLE COND FLAT BLUE/ORANGE
79100-075-4ZLT ROUND JACKETED 4 WIRE CABLE 100M
79100-110SBH CABLE COND FLAT 20AWG
79100-110SBZ-5 CABLE COND FLEXIBLE
相关代理商/技术参数
7717-86NG 功能描述:安装硬件 MNTG PAD TO-5 3LDS 8.71 DIA 1.91 THK RoHS:否 制造商:Harwin 类型:SMT Cable Clip 材料:Phosphor Bronze 安装孔大小: 长度:5 mm 外径: 内径: 厚度: 电镀:Tin 螺纹大小:
7717-89 DAP 制造商:Aavid Thermalloy 功能描述:Mounting Hardware MNTG PAD TO-18 4LD 6.35 DIA 2.03 THK
77-178-900 制造商:PRECISION BRAND 功能描述:SET FEELER GAUGE PLASTIC 12" BLADE 制造商:PRECISION BRAND 功能描述:SET, FEELER GAUGE, PLASTIC, 12" BLADE
77-178-905 制造商:PRECISION BRAND 功能描述:SET FEELER GAUGE PLASTIC 5" BLADE 制造商:PRECISION BRAND 功能描述:SET, FEELER GAUGE, PLASTIC, 5" BLADE
7717-89DAPG 功能描述:安装硬件 MNTG PAD TO-18 4LD 6.35 DIA 2.03 THK RoHS:否 制造商:Harwin 类型:SMT Cable Clip 材料:Phosphor Bronze 安装孔大小: 长度:5 mm 外径: 内径: 厚度: 电镀:Tin 螺纹大小:
7717-89N 制造商:Aavid Thermalloy 功能描述:Thrml Mgmt Access Thermal Pad Nylon
7717-89N-1K/PKG 制造商:Aavid Thermalloy 功能描述:MOUNTING PADS - Bulk
7717-89NG 功能描述:安装硬件 MNTG PAD TO-18 4LD 6.35DIA 2.03 THK NYL RoHS:否 制造商:Harwin 类型:SMT Cable Clip 材料:Phosphor Bronze 安装孔大小: 长度:5 mm 外径: 内径: 厚度: 电镀:Tin 螺纹大小: