[LINK] Electric vehicles and generation

[Geoffrey Ramadan]

Ok... lets do the numbers using 90% and 24%

Petrol has a "Energy Density" of 13,200 W-hr/kg ---> 3,432

Lead-acid  is only 22 W-hr/kg  -------------------->     20
Nickel-cadmium (Ni-Cd) 44 W-hr/kg  ------------->   40
Silver-Zinc(Ag-Zn)  110 W-hr/kg ------------------>  99
Magnesium hydride with Ni catalyst (Mg-H (Ni))  2300 W-hr/kg ---> 2,070

BTW I think the last item is actually a "fuel cell" rather than a "battery".

Geoff


Kim Holburn wrote:
> Yeah but efficiency of internal combustion engines is 26-34%,  
> efficiency of electric engines >90%
>
> This leaves you with a not dissimilar energy density.
>
> On 2006 Jul 23, at 3:31 PM, Geoffrey Ramadan wrote:
>
>> The key issue for electric vehicles is "power density" of the Battery.
>>
>> To give you an idea of the challenge for electric vehicles.
>>
>> Petrol has a "Energy Density" of 13,200 W-hr/kg
>>
>> Lead-acid  is only 22 W-hr/kg
>> Nickel-cadmium (Ni-Cd) 44 W-hr/kg
>> Silver-Zinc(Ag-Zn)  110 W-hr/kg
>> Magnesium hydride with Ni catalyst (Mg-H (Ni))  2300 W-hr/kg
>>
>> Source: http://www.energyadvocate.com/fw64.htm
>>
>> Geoffrey Ramadan B.E.(Elec)
>> Chairman, Automatic Data Capture Association (www.adca.com.au)
>> and
>> Managing Director, Unique Micro Design (www.adca.com.au)
>>
>>
>> Karl Auer wrote:
>>> On Sun, 2006-07-23 at 14:03 +1000, rchirgwin at ozemail.com.au wrote:
>>>
>>>> So: can the car be light enough to use little enough electricity to 
>>>> be practical, cheap, cover long distances, and be rechargeable from 
>>>> an accessible source?
>>>>
>>>
>>> The questions have too many assumptions in them.
>>>
>>> It does have to be practical - but just for some useful purpose, not
>>> necessarily as a complete replacement for current cars.
>>>
>>> It does have to be cheap - but overall, not necessarily just in direct
>>> saleyard price terms. I can see governments subsidising this sort of
>>> vehicle pretty soon, not just the purchase price, but things like
>>> parking, tolls etc too.
>>>
>>> It doesn't necessarily have to cover long distances at all. Most
>>> people's needs are well covered by a range of only 20km a day or so. It
>>> might make economic sense to have a small electrical or hybrid runabout
>>> for the 80% of trips that are close to home, and keep a "real" car in
>>> reserve for long distances.
>>>
>>> Regards, K.
>>>
>>>
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>
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