RQ Curve - Thermal resistance (R) and the relationship between P and Q
Fan & System Performance Rating
Thermal Conductivity Measurement
Real Thermal Solutions by ExperimentsReal Thermal Solutions by Experiments
Since 1985, we are devoted to research, design, manufacture and service for scientific instruments about thermal management, solid & fluid mechanic and educational fields, especially owns a leading position on research & measurement products for electronic cooling market.
More than 100 kinds of self-development apparatus are in our lab with the area of 18000 sq. ft. in Taiwan. Welcome to visit and have a test.
Long Win Science and Technology Corporation http://www.longwin.comHead office in TaiwanTEL: +886 3 464 [email protected]
Branch office in USATEL: +1 925 683 [email protected]
Static Pressure (P) v.s. Air Flow Rate (Q)
0
10
20
30
40
50
60
70
80
90
100
110
120
0 5 10 15 20 25 30 35 40 45 50
Air Flow Rate, Q (CFM)
Stat
ic P
ress
ure,
P (m
mA
q)
PQ Curve - The fan performance curve with static pressure (P) and air flow rate (Q)
System Impedance Curve
0
1
2
3
4
5
6
7
8
9
10
11
12
0 1 2 3 4 5 6 7 8 9 10 11 12
Air Flow Rate, Q (CFM)
Stat
ic P
ress
ure,
P (m
mA
q)
SRC Curve - System resistance measurement for PC, NB, and server
Heat Flux Method:Based on Fourier’s Law of heat conduction & ASTM D 5470-06 Standard
Model: For homogeneous materials with low K valueEX: Thermal pad and grease
Thermal Resistance v.s. Thickness
0.0
0.5
1.0
1.5
2.0
2.5
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
Thickness, Th (mm)
Ther
mal
Res
ista
nce,
R (°
C/W
)
LW-9389LW-9389 Model:For homogeneous materials with high K valueEX: Metal and alloy plates
Heat Pulse Method:For transient K measurement
Temperature v.s. Distance at different time
25
30
35
40
45
50
0 1 2 3 4 5 6
Distance from the heating center (mm)Te
mpe
ratu
re, T
(°C
)
LW-9286LW-9286 Model: For in-plane thermal conductivity measurementEX: Graphite heat spreaders
Angstrom Method:By scanning harmonic of temperature waves
Angstrom Method for Copper
10
12
14
16
18
20
22
24
26
28
0 40 80 120 160 200
Time (sec)
Tem
pera
ture
, T (°
C)
LW-9514LW-9514
Understanding scientific principles through easy operationsSuitable for academic laboratory in universities
Educational Facilities for Engineering►Solid mechanics ►Fluid mechanics ►Thermodynamics►Solid mechanics ►Fluid mechanics ►Thermodynamics
Meet AMCA 210-07; Flow rate range: 0.2~30000 CFM AMCA 210 Wind TunnelsLW-9015 seriesLW-9015 series
Temperature range: Ambient+3 ~ 90°CRelative humidity: 40 ~ 95%Temperature deviation: < ± 2°CVarious of sizes: 50×50×62 cm ~ 200×110×180 cm
Simulation of the Authentic EnvironmentNatural Convection ChamberLW-9022 seriesLW-9022 series
LW-9383LW-9383Modified JEDEC JESD 51-1 Standard of the diode arrayFast data acquisition rate: 200 kHzAdjust forward voltage, sensing current, power, ambient temp. etc.
LED Tj & Rjc Measurement
Thermal Resistance (R) v.s. Air Flow Rate (Q)
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0 25 50 75 100 125 150 175
Air Flow Rate, Q (CFM)
Ther
mal
Res
ista
nce,
R (°
C/W
)
0
5
10
15
20
25
30
35
Pres
sure
, P (m
mA
q)
In 2011, Long Win is planning to build our own
sales office and service lab in USA.
We sincerely welcome anyone who interests our products and wants to be
our sales partner.
Agencies Wanted
C
M
Y
CM
MY
CY
CMY
K
LonGwin-7.5x9.625.pdf 2011/3/4 上午 11:10:02
