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The Total Energy Budget for JES APEX 231.

For purposes of computing the energy budget the drifter will have a modular representation -- the buoyancy engine, main sensors, main controller, and data telemetry. Sections 2-5 detail the energy budget for each of these four modules. The total energy budget for APEX 231 is the sum of the energy consumed by these four modules.


 
Table 1: Total per-profile energy budget for APEX 231.
APEX buoyancy engine (profiles to 800 dbar). 4.04 kJ
Seimac ARGOS transmitter (623 xmits). 2.97 kJ
SBE41 sensors (48 STP samples, 1830 P-only samples). 1.07 kJ
APF5 controller (10.75 day cycle period). 0.89 kJ
Total energy consumed for each profile. 9.0 kJ
 

Hence, each profile to 800 dbar in the JES consumes approximately 9.0 kJ. Each D-cell can supply an amount of energy,

 \begin{displaymath}
E_{\textrm{\tiny {D-cell}}} = \left(10~\textrm{A}\textrm{Hr...
...dot \left(3600~\textrm{s Hr}^{-1}\right)
= 43.2~\textrm{kJ}~,
\end{displaymath} (1)

after derating for cold temperatures. Given 40 such D-cells then there is a total of 1.7 MJ of available energy which is enough to execute approximately 190 profiles.


next up previous
Next: The APEX 180ml Buoyancy Up: Energy Budget for JES Previous: Energy Budget for JES
Dana Swift, swift@ocean.washington.edu