| Čoahkkáigeassu: | Temperature measurements have been done in the prospect area of geothermal
Pasema Air Keruh, District Empat Lawang, South Sumatra, to determine the
temperature distribution on subsurface. Temperature measurement in monitoring
and mapping is done on an area of 800 m x 800 m with two different locations,
Penantian and Air Keliansar.
Retrieval data of temperature measurement using a temperature sticks and
electronic thermometer incorporating a thermistor as a sensor such as IC LM35.
The working principle of this instrument is that the physical phenomena detected
temperature sensor is converted into electrical signals in the potential difference,
then converted in degrees Celsius.
The results of measurements of temperature monitoring at the Penantian
obtained average surface temperatures between 26,5 oC � 29,1 oC while for Air
Keliansar obtained average surface temperature average between 27,3 oC � 30,5
oC. Distribution of heat on subsurfaces is calculated by solving the heat
conduction equation (Laplace) with a finite difference method that has been
constructed (known as the Liebmann method). The modeling assumes that twodimensional
objects shaped the plate. The results of modeling heat source on
subsurface with finite difference methods estimate the temperature reservoir in
Penantian is 400 oC at a depth of 1100 m, while for Air Keliansar the temperature
reservoir is 400 oC at a depth of 1300 m.
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