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7
POWER OUTPUT EVALUATION
Output power is the primary indication of correct setup, adjustment and operation of
the TEG. This section describes how to determine if the TEG is providing rated power.
Power output should be evaluated:
•
during initial setup at site;
•
adjusting a TEG;
•
before and after servicing a TEG, and
•
whenever altering the fuel's heat of combustion.
Note: Typical settings are 130-144 kPA (18.5 - 21. psig) for natural gas and 125-140 kPa
(18.0 - 20.0 psig) for propane.
Note: Good record keeping is necessary for long term follow-up. Use the TEG
Performance Log, located at the end of this manual, for recording details each
time adjustments are made or servicing is carried out.
7.1
Ambient Temperature Effects on V
Power from the 5220 TEG is produced by the difference in temperature between the
burner and the cooling fins. This means the power output of the TEG is affected by the
ambient temperature surrounding the generator at site. Power output increases when
temperature falls and decreases when temperature climbs.
For every 1ºC temperature drop from the ambient temperature indicated on the data
plate effects a power increase of 0.8 W and similarly, a temperature climb of 1ºC from
the ambient temperature as indicated on the data plate effects a power decrease of 0.8
W. This effect needs to be considering when setting-up the TEG.
7.1.1 Determining V
V
, proportional to rated power, must be adjusted for actual ambient temperature at site
set
as described below. Figure 19 is used to determine the appropriate V
rated power at various ambient temperatures, through calculations.
Factory test data for rated power and voltage are marked on the data plate that is located
inside the TEG cabinet door. These values are for a specific ambient temperature that
is also indicated on the data plate. They require correction for ambient temperatures
different to that indicated. The following formulas apply:
V
= V
set
set ref
Where:
Gentherm Global Power Technologies
5220
and Rated Power
set
+ [(T
- T) × 0.026]
ref
T
= Ambient temperature, at site (ºC)
T
= Reference ambient temperature, marked on Data Plate (ºC)
ref
V
= Reference set-up voltage, marked on Data Plate (V)
setref
V
= Set-up voltage, at site (V)
set
and Rated Power
set
28142 Rev. 14
and expected
set
Equation 1.
7-1
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