[PSUBS-MAILIST] Electric Battery Power

[Marc de Piolenc via Personal_Submersibles]

There are so-called air-independent diesel installations that will run 
at depth, using a stored oxidizer.

Marc

On 12/01/2019 12:00 PM, Sean T. Stevenson via Personal_Submersibles wrote:
> Diesel engines can only run when a combustion air source is available, 
> which means the submarine must be surfaced or running at shallow depth 
> with an air induction snorkel.  When running engines in either mode, the 
> engine output shaft may be connected to propulsor shafting directly for 
> maximum efficiency, or as is more typical, directly connects to 
> electrical generator(s).  The AC power output of the generator(s) is 
> then rectified to DC and used to charge the batteries, or to power the 
> DC electric motor(s) that drive the propulsor shafting, or both, 
> depending on operational requirements.  When submerging, the engines are 
> stopped, the air induction shafting is closed and mast(s) retracted, and 
> the batteries alone power the electric motor(s) on the propulsor 
> shaft(s).  This pure electric mode of operation is near silent.  
> Diesel-electric boats are quieter than nuke boats when running submerged 
> for that reason, absent a number of elaborate and very expensive 
> mitigation measures.  Power from the batteries is also drawn off for 
> vessel system and hotel loads, so when the available battery power is 
> low, the sub needs to surface in a safe place, or ascend to snorting 
> depth in a safe-enough place, and run the engines to recharge the batteries.
> 
> That's it in a nutshell.
> 
> Sean
> 
> ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
> On Friday, January 11, 2019 8:27 PM, Christopher Cave via 
> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
>> Can anyone tell me how diesel/electric submarines, old or modern, 
>> convert the battery power to run the engines and provide power for 
>> boats systems? A flow chart or schematic included would be very helpful.
>>
>> Thanks,
>> Chris
> 
> 
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