Loading...
 

PureSIG


Research conference: Engineering and Technology in development

Tanzania
Hi Robert,

Thanks for your quick response.

What information do you need? I attach a couple of pictures of our current prototype. This one is using a 24V dc motor as a generator. It requires high speed - possibly not quite as high as a vehicle generator would need. We rule it out for actual applications because we don't expect it to be available to us here in Tanzania. We used it on the initial prototype purely because we happened to have one which could be used to test the overall principle.

The current two options for generators are these:

1. Generator made to order by a Dar-es-Salaam wind turbine maker.

Voltage: Design is for 48V dc at 240rpm. We expect to get 12V at a bit more than 60rpm. The constructor estimates about 90rpm.

Capacity: 350W. OK for our initial tests which will be with a single donkey. Also possible to test it with 2 donkeys but will have to be careful about overheating. Published power output for a donkey is 200W.

Speed required for rated output: 90rpm. That is good for this purpose.

Efficiency: Said to be good but we have yet to test it.

Robustness: Looks good. We wont know if it is sufficient until we have extensive village experience.

Cost: $585. This is a big problem. Probably wont be affordable at that price.

2. Vehicle generator. (Land Rover 109.)

Voltage: Designed for charging batteries at 12 - 14V output.

Capacity: Unknown but probably sufficient for a single donkey.

Speed required: Again not known in detail but probably 1,000 to 2,000 rpm. This will require lots of speed increase gearing and will be a big disadvantage.

Efficiency: Said to be poor. Big disadvantage if we lose a lot of power.

Robustness: Again, we really don't know until we have extensive village experience.

Cost: About $115 That is the main plus feature of this option.

3. Our ideal specification.

Ideally, we would like a capacity of from 250W to a maximum of about 3.5kW - i.e. a range of machines.

Voltage - we anticipate the first use will be for 12V battery charging. People use old car batteries for driving lights, radios etc.

Speed: The nearer to the donkey speed the better. The current wheel is 600mm dia and we anticipate it will turn at around 37rpm.

Efficiency: High efficiency is needed so as not to waste our precious energy.

Robustness: It will be used by village people who don't have exposure to machinery generally. Hence it needs to be very robust.

Cost: The lower the better - of course. Around $300 would be the point at which it may become unviable. This figure is currently just an estimate as we do not have village experience yet.

I would be happy to enter into correspondence directly with any engineer who takes this project on board.

Many thanks and Cheers,

Jim
--- Original Message ---
From: hedon at hedon.info
To: jim at twende-tanzania.org
Sent: Tuesday, November 08, 2011 2:43 PM
Subject: PureSIG Research conference: Engineering and Technology in development



We could assist but could only base the decision on more information

Cheers
Robert =20

---Original Message---
From:hedo@... mailto:hedon@hedon.info=20
Sent: 01 November 2011 12:18 PM
To:robe@...
Subject: PureSIG Research conference: Engineering and Technology in =
development


would this group do some research on impact of energy efficient devices =
on lives of poor, mountain women? for an NGO that is small time and can =
offer only bare minimum support to the researcher?

On Thu, Jan 6, 2011 at 4:03 AM, Miriam Hansen <PureSIG@hedon.info> =
wrote:

>
> Dear All,
>
>
> You might find the following of interest:
>
>
>
> *Engineering and technology in development*
>
> *Do you have a technical issue that needs researching?*
>
> Engineers Without Borders UK supports volunteers to help your=20
> organisation with technical challenges.
>
> Our Research Programme does this by linking engineering and science=20
> students with international development organisations to undertake=20
> research at undergraduate and masters level.
>
> If you have a technical issue you would like researched, please feel=20
> free to contact us and discuss your ideas.
>
> Email:rese@...
>
> Telephone: +44 (0)1223 305 888
>
> More information and past examples of research projects are available=20
> on our
> website: www.ewb-uk.org/programmes/research/partnerinfo.
>
>
>
>
>
>
> --
> *Miriam HANSEN MEng*
> Community Coordinator | *HEDON Household Energy Network*
> ***T: *+44-(0)20 30 120 130 | *M:* +44-(0)7595 715820
> *Website*: support.hedon.info *| Online platform:* www.hedon.info PO=20
> Box 900, London, Bromley, BR1 9FF, UK
>
> Visit our online journal *Boiling Point*<=20
> http://www.hedon.info/BoilingPoint> | Join our* London meet up=20
> <http://www.hedon.info/LondonRIG>*
>
> --
> HEDON PureSIG - Established in March 2008, PureSIG connects all those=20
> engaged in the productive use of energy and renewable energy in=20
> developing countries.
> The term productive uses of energy is commonly used for income=20
> generation by selling energy or energy technologies, and sometimes in=20
> a broad sense, including energy services to schools and health=20
> services. Both uses of of the term "productive uses" divert attention=20
> away from the potentially huge, but in practice small, contribution of =

> modern (renewable) energy to income generation in small enterprises by =
the poor themselves.
> Unsubscribe www.hedon.info/Groups | Visit the forum online
> http://www.hedon.info/forum2
>
>

--
HEDON PureSIG - Established in March 2008, PureSIG connects all those =
engaged in the productive use of energy and renewable energy in =
developing countries.
The term productive uses of energy is commonly used for income =
generation by selling energy or energy technologies, and sometimes in a =
broad sense, including energy services to schools and health services. =
Both uses of of the term "productive uses" divert attention away from =
the potentially huge, but in practice small, contribution of modern =
(renewable) energy to income generation in small enterprises by the poor =
themselves.
Unsubscribe www.hedon.info/Groups | Visit the forum online =
http://www.hedon.info/forum2


__ Information from ESET NOD32 Antivirus, version of virus =
signature database 6591 (20111031) __

The message was checked by ESET NOD32 Antivirus.

http://www.eset.com






HEDON PureSIG - Established in March 2008, PureSIG connects all those engaged in the productive use of energy and renewable energy in developing countries.
The term productive uses of energy is commonly used for income generation by selling energy or energy technologies, and sometimes in a broad sense, including energy services to schools and health services. Both uses of of the term "productive uses" divert attention away from the potentially huge, but in practice small, contribution of modern (renewable) energy to income generation in small enterprises by the poor themselves.
Unsubscribe www.hedon.info/Groups | Visit the forum online http://www.hedon.info/forum2
 
  • A practitioner's journal on household energy, stoves and poverty reduction.



Upcoming Events

No records to display