Enhanced cooker

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Tutorial de avatarL'Atelier Low Tech | Categories : Housing, Food, Energy, Hygiene, Materials, Health

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Enhanced cooker or "cocina mejorada": how to build a kitchen using natural and local materials. These cookers contribute to improving health conditions of families living in rural areas in Bolivia.

Difficulty
Easy
Duration
6 day(s)
Cost
00 EUR (€)
Other languages:
English • ‎español • ‎français
License : Attribution (CC BY)

Introduction

In the countryside around Sucre, Bolivia, women cook using wood fire. The smoke from the wood consumption leads to cough and lungs diseases. The wood is consumed more rapidly outdoors and, as they do not own any car, the families have to go and get the wood (leña) by foot which could be up to 3 hours away down the mountain.

The "enhanced cookers" or "cocinas mejoradas" are located inside, sheltered from rain and wind. They have a chimney which leads the smoke outside, improving health conditions of the women who cook and their family who do not breathe the smoke anymore. These cookers are more efficient and consume wood less rapidly. So, less ways to gather leña are necessary.

The association Instituto Politecnico Tomas Katari - IPTK of Sucre works with 14 communities around Pitantora in Bolivia in order to improve Food Safety of families living in rural areas. The association builds enhanced cookers for families but also teaches them to build them. The IPTK's support is sustainable through time thanks to a real knowledge transfer: the families who know how to build cocina mejorada can then help other familles build their own.

Advantages:

  • Cheap because is made using local materials
  • Health enhancement (smoke is led outside)
  • Reduction of wood consumption
  • Gain of time (more efficient cooking, less ways are required to get the wood)

Caution :

Cooking inside can lead to additional work: it was necessary to add windows to the houses made of Adobe -houses made of earth and straw- so that sun beams can light the room. (Before windows were not necessary as women cooked outside)

Disadvantages: The cocina mejorada is only adapted to the pots it was built for. If you change your pots, it should be necessary to adjust the size of the holes which let the heat pass through. If your new pot is smaller, you can try to fix it in the hole using rocks (so that it does not fall) but the cooking will be less efficient as the heat will escape between the rocks.

The cocina mejorada can be built within a day but it is previously necessary to let the donkey's dung ferment for 5 days.

Materials

  • rocks
  • clay
  • salt
  • pig hair
  • donkey's dung which has previously fermented for 5 days in plastic tarpaulin
  • straw
  • water
  • sheet metal / iron armatures for the chimney

Tools

  • barrow, buckets
  • shovel

Step 1 - Mixture

The enhanced cookers are made using the following mixture:

- For 1 barrow of clay:

- 3 handfuls of straw

- 1kg of salt (for thermal storage)

- ½ handful of pig hair

- 5L (a half-bucket) of donkey's dung previsouly fermented for 5 days in plastic.

- Add water until obtaining a wet mixture but which is not liquid (like a dough, not too wet, not too dry)

Step 2 - Basis

Build the basis by stacking rocks and using the mixture as a cement.

Adjust the height at your convenience.


Step 3 - Cooker

To build the roof, stack rocks which, once removed, will give the roof its shape. (number 1 on the corresponding graph).

Build the cooker by spreading the mixture all around the rock heap (2).

On the roof, dig holes which have the dimension of your pots. (3).

Once the mixture is dried, remove the rocks one by one (4).

Step 4 - Chimney

The chimney should lead the smoke outside the house.

It could be built using sheet metal (best option) or using Adobe (mixture of earth and straw). For the adobe constructions, the chimney should be reinforced using iron armatures.



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