POWER OUTPUT EVALUATION
Gentherm Global Power Technologi
es
Page 36
Equation 2
- P
set
= P
setref
+ [(T
ref
- T) × 0.4]
Where:
T = Ambient temperature, at site (ºC)
T
ref
= Reference ambient temperature, marked on Data Plate (ºC)
P
setref
= Reference power marked on TEG Data Plate (W)
P
set
= Rated power at new ambient (W)
NOTE:
Avoid setting-up the TEG to run at higher V
set
or rated power values, as its
life may be affected. This method is suitable for ambient temperatures of up
to 65.5ºC (150ºF). If in doubt contact Gentherm Global Power Technologies’
(GPT) Customer Service Department for guidance.
Example:
Ambient temperature at site is 35ºC. Set-up power of 127 W and V
set
of
6.8 V, 22ºC is marked on the TEG Data Plate.
V
set
= V
setref
+ [(T
ref
- T) × 0.00925]
= 6.8 + [(22 - {35}) × 0.00925]
= 6.8 + [(22 - 35) × 0.00925]
= 6.8 + [-13 × 0.00925]
= 6.8 + [-0.1203]
= 6.8 - 0.1203
= 6.68 V
P
set
= P
setref
+ [(T
ref
- T) × 0.4]
= 127 + [(22 - {35}) × 0.4]
= 127 + [(22 - 35) × 0.4]
= 127 + [-13 × 0.4]
= 127 + [-5.2]
= 127
–
5.2
= 121.8 W
7.1.2
Determining V
set
And Rated Power Graphically
A good approximation to V
set
and rated power can be obtained from the chart shown in Figure
18. Knowing the ambient temperature, move up vertical to the line. Read the V
set
from the
right side of the graph and rated power from the left side.
