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| − | [[File:GIZ HERA Cooking Energy Compendium small.png|left|831px|GIZ HERA Cooking Energy Compendium|alt=GIZ HERA Cooking Energy Compendium small.png|link=GIZ HERA Cooking Energy Compendium]]<br/>[[GIZ HERA Cooking Energy Compendium#Basics about Cooking Energy|Basics]] | [[GIZ HERA Cooking Energy Compendium#Policy Advice on Cooking Energy|Policy Advice]] | [[GIZ HERA Cooking Energy Compendium#Planning Improved Cook Stove .28ICS.29 Interventions|Planning]] | [[GIZ HERA Cooking Energy Compendium#Designing and Implementing Improved Cookstoves .28ICS.29 Supply Interventions|Designing and Implementing (ICS Supply)]]| '''[[GIZ HERA Cooking Energy Compendium#Cooking Energy Technologies and Practices|Technologies and Practices]]''' | [[GIZ HERA Cooking Energy Compendium#Designing and Implementing Woodfuel Supply Interventions|Designing and Implementing (Woodfuel Supply)]]| [[GIZ HERA Cooking Energy Compendium#Climate Change Related Issues|Climate Change]] | + | [[File:GIZ HERA Cooking Energy Compendium small.png|left|831px|GIZ HERA Cooking Energy Compendium|alt=GIZ HERA Cooking Energy Compendium small.png|link=GIZ HERA Cooking Energy Compendium]]<br/><br/><!-- |
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| | + | -->{{#ifeq: {{#show: {{PAGENAME}} |?Hera category}} | Cooking Energy System |'''[[GIZ HERA Cooking Energy Compendium#Cooking Energy Technologies and Practices|Cooking Energy System]]''' {{!}} | [[GIZ HERA Cooking Energy Compendium#Cooking Energy Technologies and Practices|Cooking Energy System]] {{!}} | }} <!-- |
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| | + | -->{{#ifeq: {{#show: {{PAGENAME}} |?Hera category}} | Basics |'''[[GIZ HERA Cooking Energy Compendium#Basics about Cooking Energy|Basics]]''' {{!}} | [[GIZ HERA Cooking Energy Compendium#Basics about Cooking Energy|Basics]] {{!}} | }} <!-- |
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| | + | -->{{#ifeq: {{#show: {{PAGENAME}} |?Hera category}} | Policy Advice |'''[[GIZ HERA Cooking Energy Compendium#Policy Advice on Cooking Energy|Policy Advice]]''' {{!}} | [[GIZ HERA Cooking Energy Compendium#Policy Advice on Cooking Energy|Policy Advice]] {{!}} | }} <!-- |
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| | + | -->{{#ifeq: {{#show: {{PAGENAME}} |?Hera category}} | Planning |'''[[GIZ HERA Cooking Energy Compendium#Planning Cooking Energy Interventions|Planning]]''' {{!}} | [[GIZ HERA Cooking Energy Compendium#Planning Cooking Energy Interventions|Planning]] {{!}} | }} <!-- |
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| | + | -->{{#ifeq: {{#show: {{PAGENAME}} |?Hera category}} | ICS Supply |'''[[GIZ HERA Cooking Energy Compendium#Designing and Implementing Improved Cookstoves .28ICS.29 Supply Interventions|Designing and Implementing ICS Supply]]''' {{!}} | [[GIZ HERA Cooking Energy Compendium#Designing and Implementing Improved Cookstoves .28ICS.29 Supply Interventions|Designing and Implementing ICS Supply]] {{!}} | }} <!-- |
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| | + | -->{{#ifeq: {{#show: {{PAGENAME}} |?Hera category}} | Woodfuel Supply |'''[[GIZ HERA Cooking Energy Compendium#Designing and Implementing Woodfuel Supply Interventions|Designing and Implementing Woodfuel Supply]]''' {{!}} | [[GIZ HERA Cooking Energy Compendium#Designing and Implementing Woodfuel Supply Interventions|Designing and Implementing Woodfuel Supply]] {{!}} | }} <!-- |
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| | + | -->{{#ifeq: {{#show: {{PAGENAME}} |?Hera category}} | Climate Change |'''[[GIZ HERA Cooking Energy Compendium#Climate Change Related Issues|Climate Change]]''' | [[GIZ HERA Cooking Energy Compendium#Climate Change Related Issues|Climate Change]] {{!}} | }} <!-- |
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| | + | -->{{#ifeq: {{#show: {{PAGENAME}} |?Hera category}} | Extra |'''[[GIZ HERA Cooking Energy Compendium#Climate Change Related Issues|Extra]]''' | [[GIZ HERA Cooking Energy Compendium#Climate Change Related Issues|Extra]] }} |
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| | <u>The main principles for efficient firewood management are:</u> | | <u>The main principles for efficient firewood management are:</u> |
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| | #Remove the moisture out of the firewood; | | #Remove the moisture out of the firewood; |
| | #Increase the surface of the firewood; | | #Increase the surface of the firewood; |
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| | <p style="text-align: center">'''more firewood = more heat generation = faster cooking'''</p> | | <p style="text-align: center">'''more firewood = more heat generation = faster cooking'''</p> |
| | However, in any kind of stove with enclosed combustion chamber one can observe a point where this equation does come to its limits. Instead of an increase of heat, one can suddenly observe more smoke, a darker flame colour and less heat. There are several effects which can contribute to this observation: | | However, in any kind of stove with enclosed combustion chamber one can observe a point where this equation does come to its limits. Instead of an increase of heat, one can suddenly observe more smoke, a darker flame colour and less heat. There are several effects which can contribute to this observation: |
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| | *Fresh wood is much colder than the wood in the reactor. If a lot of fresh wood is added to the combustion chamber, it cools down the temperature of the reactor until it is heated up to the same level. | | *Fresh wood is much colder than the wood in the reactor. If a lot of fresh wood is added to the combustion chamber, it cools down the temperature of the reactor until it is heated up to the same level. |
| | *Additional wood will be placed on top of the wood which is already in the reactor. Hence it might cover some part of the surface of the already heated wood, reducing the space for the reaction between the air and the wood. | | *Additional wood will be placed on top of the wood which is already in the reactor. Hence it might cover some part of the surface of the already heated wood, reducing the space for the reaction between the air and the wood. |
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| | '''Recommendation:''' | | '''Recommendation:''' |
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| | *In an improved firewood cook stove, it is sufficient to start the fire with three sticks of (small) wood only. | | *In an improved firewood cook stove, it is sufficient to start the fire with three sticks of (small) wood only. |
| | *Once the fire is going, the heat can be regulated by the number of sticks. Do not go beyond 3 sticks at a time. | | *Once the fire is going, the heat can be regulated by the number of sticks. Do not go beyond 3 sticks at a time. |
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| | == Extinguish Surplus Wood at the End of the Cooking Process<br/> == | | == Extinguish Surplus Wood at the End of the Cooking Process<br/> == |
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| | = Further Information<br/> = | | = Further Information<br/> = |
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| | [[GIZ HERA Cooking Energy Compendium|--> Back to Overview GIZ HERA Cooking Energy Compendium]] | | [[GIZ HERA Cooking Energy Compendium|--> Back to Overview GIZ HERA Cooking Energy Compendium]] |
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| − | [[Category:Cooking_Energy]]
| + | {{#set: Hera category=Cooking Energy System}} |
| − | [[Category:Wood_Energy]]
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| | [[Category:Cooking_Energy_Compendium_(GIZ_HERA)]] | | [[Category:Cooking_Energy_Compendium_(GIZ_HERA)]] |
| | + | [[Category:Firewood]] |
| | + | [[Category:Energy_Efficiency]] |
| | + | [[Category:Wood_Energy]] |
| | + | [[Category:Cooking_Energy]] |
Firewood is a valuable source of energy, whether it is collected or bought on the market. It involves financial or time resources of the household to obtain it. Even users of traditional cookstoves can save firewood by applying the following firewood management techniques. Clever firewood management can save approximately 20 - 30% of the total cooking fuel requirement.
Freshly collected firewood contains up to 50% water. This water not only has no heating value, it is also consuming 25 - 35% of the energy of the wood to remove the moisture within the cooking process. Hence, wet wood has a low power output and a low temperature. Smoke is the visible indication of this wasteful practice.
Firewood does not burn as such. It is the gasses generated in the process of its decomposition. For it to decompose, the wood has to be heated. Thick pieces of wood require a lot of heat to reach these temperatures. Hence, it takes a lot of time until the wood burns efficiently. Smoke is an indication that the decomposition of the firewood has not yet progressed sufficiently.
A wood-fire is fuel regulated. To increase the heat output, more fuel can be supplied to the combustion chamber. In short:
However, in any kind of stove with enclosed combustion chamber one can observe a point where this equation does come to its limits. Instead of an increase of heat, one can suddenly observe more smoke, a darker flame colour and less heat. There are several effects which can contribute to this observation:
In most cooking processes we can distinguish high-power phases (e.g. to bring a cold pot to boiling point) and low-power phases (e.g. for keeping a hot pot at the boiling point = simmering). Inexperienced cooks tend to use a lot of wood in the stove all the time, regulating the heat transfer through modification of the distance between the pot and the stove. This is a very wasteful practice.
It is a common observation that wood is still burning in a stove after the cooking has been completed. This wood should be extinguished once the fire is no longer needed. This applies as well for any burning wood which is removed from the fire e.g. at the start of the simmering phase.
These are fuel-specific recommendations for firewood, but they apply as well for other processed types of solid biomass.
