[Stoves] The Cookstove / Homestead Garden Ecosystem in Bangladesh

[Crispin Pemberton-Pigott]

Dear Julien

 

Do you know on what basis the thermal efficiency of 30% was determined?

 

Thanks

Crispin

 

 

 

Dear Dieter and list;

 

Thank-you for you calculations.  They are very helpful to clarify the point that efficient cookstoves reduces the stress on scarce biomass resources.

 

As was recently highlighted on the Stoves listserv, a Servals TLUD cookstove is at the centre of a development project on the Indian side of the Sundarbans.  In a preliminary survey of stove acceptance, the saving in fuelwood gathering and time spent collecting fuel were cited as attractive attributes of the stove.

http://www.biochar-international.org/sites/default/files/Servals-Sapient_TLUD_Pilot_Study-Sunderbans_project.pdf

(A caveat for this survey and the apparent success of the TLUD:  the people live near a lot of wood fuel that is good for TLUDs, and it would seem that the only alternative cooking technology in use was the traditional mud stove, so the TLUD was a very good option in those circumstances.)

 

The current improved cookstove being most widely promoted in Bangladesh today the "Bondhu Chula".  It is a combustion stove, with bottom-fed primary air, and secondary air and fuel-loading coming through a side port.  It is all assembled in a cooking bench with a chimney.  It has an energy efficiency of around 30%.  The design was developed by the Bangladesh Council of Scientific and Industrial Research, and variations are being distributed by NGOs like GIZ.

 

I have attached a photograph that shows the locally-manufactured cement modules.  

1)  On the right is the fire box.  It has a metal grate at the bottom for primary air, and you can see the hole for fuel and secondary air at the top.  On the top of this fire box sits the pot.  This configuration is a "single mouth" cooker.  What you can't see is a small hole at the left side of the fire box that directs emissions to ...

2)  The chimney modules on the left side of the picture.

These modules are enclosed in a clay cooking bench.

 

Twenty-five million households cook with biomass.  Of these, I believe only a couple of million use the improved cookstove, but I could be very mistaken on that number.

 

Ah!!  My photo is redundant.  I just found a Youtube video: http://www.youtube.com/watch?v=0n7ZU9K2YtE

 

 

Regards,

Julien.

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