Solar Cooking
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A study in [[:Category:Gujarat|Gujarat]] State of [[India]] among box solar cooker owners showed that a good part of the box solar cooker owners use their cookers for non-cooking purposes. Below are a few of the less obvious uses of a solar cooker, demonstrating it's versatility. Even if a solar cooker is used regularly for everyday cooking, these special purposes may only increase its value. In several cases, a solar oven demonstrates distinct advantages over conventional ovens/cooktops in that a solar oven will not typically reach temperatures that burn.
   
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==Water pasteurization==
A study in Gujarat State of India among box solar cooker owners showed that a good part of the box solar cooker owners use their cookers for non-cooking purposes. By non-cooking uses I mean uses other than everyday meal cooking. Some examples of non-cooking uses are vegetable drying or baking etc. which will be discussed later. I observed that due to certain reasons, some families could not use their solar cooker for everyday meals such as lunch or dinner, but they used it mainly for non-cooking purposes. Some other families used their solar cookers for both cooking and non-cooking purposes.
 
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{{Main|Water pasteurization}}
   
 
==Jam making/pickle making/ketchup making==
The fact that a box solar cooker can be used for non-cooking purposes is a strong characteristic of solar box cookers, because in many cases the panel and parabolic solar cookers are not suitable for most of the non-cooking uses given in this article. Maybe it is specially interesting for solar cooking producers, introducers and disseminators to incorporate this aspect of box solar cookers in the introduction phase of box solar cookers.
 
   
 
During the summer many kinds of vegetables and fruits are available at cheap prices in the market. In many places some of these vegetables and fruits are not available in the cold seasons of fall and winter. For example ketchup or chutney (chatni) can be prepared from tomato in the solar cooker for consumption later in the year. Another example is to make jam or pickle out of certain fruits and/or vegetables for example mango, carrot, cauliflower etc. in the summer time for later consumption. Solar box cooker due to its proper range of temperature for simmering of vegetables and fruits can be used for preparation of jam, pickle and ketchup making.
==Why it is possible to use solar box cookers for non-cooking purposes?==
 
   
 
==Canning fruits==
Most solar cookers function like an oven - that is why they are also referred to as solar ovens. Once a solar oven has been set in the sun, the temperature gradually rises as it collects solar energy. After some time, depending on the amount of sunshine and the thermal losses from the walls of the oven, the temperature within the box will eventually reach a relatively stable maximum temperature of about 80-100 °C (176 ° - 212 °F. However, this may vary depending on the sunshine, ambient temperature, quality and size of the cooker, and the type and size of the pot and the food inside. It is this stable, mild heat range in a solar oven that makes it advantageous for many of the following non-cooking uses.
 
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{{Main|Canning}} ''(Note that only fruits can be canned safely without the use of pressure.)''
   
==Some examples of non-cooking uses==
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==Drying of vegetables and fruits==
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{{Main|Solar food drying}}
Below are a few of the less obvious uses of a solar cooker, demonstrating it's versatility. Even if a box solar cooker is used regularly for everyday cooking, these special purposes may only increase its value. In several cases, a solar oven demonstrates distinct advantages over conventional ovens/cooktops in that a solar oven will not typically reach temperatures that burn.
 
 
===Jam making/pickle making/ketchup making===
 
 
During the summer many kinds of vegetables and fruits are available at cheap prices in the market. In many places some of these vegetables and fruits are not available in the cold seasons of fall and winter. For example ketchup or chatni can be prepared from tomato in the solar cooker for consumption later in the year. Another example is to make jam or pickle out of certain fruits and/or vegetables for example mango, carrot, cauliflower etc. in the summer time for later consumption. Solar box cooker due to its proper range of temperature for simmering of vegetables and fruits can be used for preparation of jam, pickle and ketchup making.
 
 
===Canning fruits===
 
See [[Canning]].
 
 
===Drying of vegetables and fruits===
 
   
 
Drying vegetables and fruits for later use (for example ginger) is another special use of a solar oven. This is desired when there is plenty of cheap vegetables or fruits available. In some food cultures people dry onion, aubergine (eggplants), ladyfingers (okra), ginger, tomato etc. for consumption later in the year when they are scarce and also expensive.
 
Drying vegetables and fruits for later use (for example ginger) is another special use of a solar oven. This is desired when there is plenty of cheap vegetables or fruits available. In some food cultures people dry onion, aubergine (eggplants), ladyfingers (okra), ginger, tomato etc. for consumption later in the year when they are scarce and also expensive.
   
See [[Solar food dryers]].
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==Solar cooling==
  +
Solar cooling in this case usually relates to using the sun to create the necessary heat for evaporation. The resulting phase change of water from a liquid to a vapor absorbs the heat from the remaining water, and the surrounding materials will become cooler relative to the air temperature. With an ample water supply, this technique can be useful for keeping foods refrigerated without electricity. See: [[Pot-in-pot cooler]]
   
===Making of Ghee===
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==Making of Ghee==
   
 
A solar oven is ideal for the making of clarified butter, known as ghee. Ghee is a very popular food in India, particularly useful because it does not need refrigeration as does butter. Ghee is made by heating butter in the solar oven over about an hour or so. It should have a very low simmering, because over 80°C the butter will burn. After some time an opaque residue will separate from the melted butter leaving a transparent liquid which is the ghee. The residue is discarded. How to ensure the solar oven does not overheat is discussed at the bottom of this page.
 
A solar oven is ideal for the making of clarified butter, known as ghee. Ghee is a very popular food in India, particularly useful because it does not need refrigeration as does butter. Ghee is made by heating butter in the solar oven over about an hour or so. It should have a very low simmering, because over 80°C the butter will burn. After some time an opaque residue will separate from the melted butter leaving a transparent liquid which is the ghee. The residue is discarded. How to ensure the solar oven does not overheat is discussed at the bottom of this page.
   
===Heating milk===
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==Heating milk==
   
 
A box solar cooker is ideal for heating milk for drinking, cream making or other purposes, because the temperature range a solar cooker reaches will not burn the milk. Milk is sensitive to temperature over ca. 96 °C, it will simply burn and stick and an unpleasant odor will remain in the boiled milk. Here again the temperature range of the solar oven is the advantage.
 
A box solar cooker is ideal for heating milk for drinking, cream making or other purposes, because the temperature range a solar cooker reaches will not burn the milk. Milk is sensitive to temperature over ca. 96 °C, it will simply burn and stick and an unpleasant odor will remain in the boiled milk. Here again the temperature range of the solar oven is the advantage.
   
 
==Candle-making (melting wax)==
===Baking cake and bread===
 
 
Leftover wax candle stubs can be saved and melted down in a solar cooker, poured into a mold (paper cup, plastic bottle, coconut, etc.) to make a new candle. The wick: somehow fasten an organic-source string going from the bottom to the top of the mold.
   
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*'''July 2013:''' [http://kristaschnee.hubpages.com/hub/How-to-Make-Recycled-Candles-in-a-Solar-Oven How to Make Recycled Candles in a Solar Oven] - ''Krista Schnee''
Baking bread, cake and the like can also be carried out in a solar box cooker. Here the appropriate temperature range of the solar cooker is decisive not to burn the cake but to bake it just as an electric oven does it in a modern kitchen.
 
   
 
==Ironing clothes==
===Candle-making (melting wax)===
 
 
Leftover wax candle stubs can be saved and melted down in a solar cooker, poured into a mold (paper cup, plastic bottle, coconut, etc.) to make a new candle. The wick: somehow fasten an organic-source string going from the bottom to the top of the mold.
 
 
===Ironing clothes===
 
 
[[File:AlSol_irons.jpg|thumb|250px|Traditional irons to be heated with a [[parabolic solar cooker]].]]
 
[[File:AlSol_irons.jpg|thumb|250px|Traditional irons to be heated with a [[parabolic solar cooker]].]]
 
Traditional irons did not use electricity, but had compartments where hot coals would be placed. They are still in use today. A suggestion that arrived from [[AlSol]], is to take two irons and alternate between having one heated by a [[parabolic solar cooker]], and one being used. Adding stones or clay into the compartment will add to the ironing time. A parabolic style cooker is best suited to provide the focused heat required for ironing.
 
Traditional irons did not use electricity, but had compartments where hot coals would be placed. They are still in use today. A suggestion that arrived from [[AlSol]], is to take two irons and alternate between having one heated by a [[parabolic solar cooker]], and one being used. Adding stones or clay into the compartment will add to the ironing time. A parabolic style cooker is best suited to provide the focused heat required for ironing.
   
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Solar cooking advocate Pat McArdle has produced a short you tube video which demonstrates the ability of a parabolic solar cooker to heat water for tea in the snow when the outside temperature is below 30 degrees F or 0 degrees C. In the summer the same parabolic solar cooker is used to heat a traditional iron to press a linen table cloth. http://www.youtube.com/watch?v=1yOOxCnM6Ns
===Insect killing of grains===
 
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==Insect killing of grains==
   
 
In some areas and in some seasons, the grain storage of the family may be exposed to development of small insects in the grain. These insects might be mixed with grain! Getting these insects away from the grain may usually be a difficult task to be done manually. In Gujarat I saw that some families put their insect-exposed grain, bean, peas etc. in the solar cooker a few hours during a day or two, in this way the insects are killed due the heat of the oven while the grain, beans, peas etc. was not damaged. Afterwards the family could easily get rid of the dead insects by blowing them or using sieve.
 
In some areas and in some seasons, the grain storage of the family may be exposed to development of small insects in the grain. These insects might be mixed with grain! Getting these insects away from the grain may usually be a difficult task to be done manually. In Gujarat I saw that some families put their insect-exposed grain, bean, peas etc. in the solar cooker a few hours during a day or two, in this way the insects are killed due the heat of the oven while the grain, beans, peas etc. was not damaged. Afterwards the family could easily get rid of the dead insects by blowing them or using sieve.
   
  +
==Heating water for household uses==
===Pasteurize contaminated water===
 
   
See [[Water pasteurization]]
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{{See|Magnato Water Bottle Heater}}
   
===Coffee roasting===
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==Coffee roasting==
   
See [[Coffee roasting]].
+
{{Main|Coffee roasting}}
   
===Soil sterilization===
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==Soil sterilization==
   
See [[Soil sterilization]]
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{{Main|Soil sterilization}}
   
  +
==Making mosquito repellant==
===Smelting===
 
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*[[Neelaratna Geekiyanage|Make herbal mosquito repellant in a solar cooker]]
   
 
==Smelting==
See [[Solar Smelters International]].
 
  +
 
{{Main|Solar Smelters International}}
   
 
==Ventilation/temperature adjusting==
 
==Ventilation/temperature adjusting==
   
 
During the study in Gujarat I observed that some families decreased the temperature and moisture developed in their solar cookers, by slightly opening the top glass lid of their cooker by temporarily creating a gap for the oven. This is indeed an easy and effective way to control the temperature/moisture within the oven. One can for example place a coin or a small glass ball to keep the top sash open. This is necessary specially when the sun is high and one should avoid high temperatures for some of the above-mentioned special uses for example when one is heating milk.
 
During the study in Gujarat I observed that some families decreased the temperature and moisture developed in their solar cookers, by slightly opening the top glass lid of their cooker by temporarily creating a gap for the oven. This is indeed an easy and effective way to control the temperature/moisture within the oven. One can for example place a coin or a small glass ball to keep the top sash open. This is necessary specially when the sun is high and one should avoid high temperatures for some of the above-mentioned special uses for example when one is heating milk.
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==Distillation of water==
  +
{{Main|Water distillation}}
  +
  +
==Autoclave==
  +
{{Main|Solar autoclave}}
   
 
==Home heating==
 
==Home heating==
   
I built a solar cooker to heat rocks for keeping our feet warm at night.
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It has been reported that people have built a solar cooker to heat rocks for keeping warm at night. Adding a little water to the remaining rocks adds nice warm humidity to the inside air.
Adding a little water to the remaining rocks adds nice warm humidity to our dry winter air.
 
   
 
==See also==
 
==See also==
 
 
*[[Solar food processing]]
 
*[[Solar food processing]]
 
''The original text of this article was written by [[Bashir Ahmad]].''
 
 
[[Category:Browse]]
 
[[Category:Browse]]

Revision as of 18:28, 24 February 2015

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Last edited: 24 February 2015      

A study in Gujarat State of India among box solar cooker owners showed that a good part of the box solar cooker owners use their cookers for non-cooking purposes. Below are a few of the less obvious uses of a solar cooker, demonstrating it's versatility. Even if a solar cooker is used regularly for everyday cooking, these special purposes may only increase its value. In several cases, a solar oven demonstrates distinct advantages over conventional ovens/cooktops in that a solar oven will not typically reach temperatures that burn.

Water pasteurization

Main article: Water pasteurization

Jam making/pickle making/ketchup making

During the summer many kinds of vegetables and fruits are available at cheap prices in the market. In many places some of these vegetables and fruits are not available in the cold seasons of fall and winter. For example ketchup or chutney (chatni) can be prepared from tomato in the solar cooker for consumption later in the year. Another example is to make jam or pickle out of certain fruits and/or vegetables for example mango, carrot, cauliflower etc. in the summer time for later consumption. Solar box cooker due to its proper range of temperature for simmering of vegetables and fruits can be used for preparation of jam, pickle and ketchup making.

Canning fruits

Main article: Canning
(Note that only fruits can be canned safely without the use of pressure.)

Drying of vegetables and fruits

Main article: Solar food drying

Drying vegetables and fruits for later use (for example ginger) is another special use of a solar oven. This is desired when there is plenty of cheap vegetables or fruits available. In some food cultures people dry onion, aubergine (eggplants), ladyfingers (okra), ginger, tomato etc. for consumption later in the year when they are scarce and also expensive.

Solar cooling

Solar cooling in this case usually relates to using the sun to create the necessary heat for evaporation. The resulting phase change of water from a liquid to a vapor absorbs the heat from the remaining water, and the surrounding materials will become cooler relative to the air temperature. With an ample water supply, this technique can be useful for keeping foods refrigerated without electricity. See: Pot-in-pot cooler

Making of Ghee

A solar oven is ideal for the making of clarified butter, known as ghee. Ghee is a very popular food in India, particularly useful because it does not need refrigeration as does butter. Ghee is made by heating butter in the solar oven over about an hour or so. It should have a very low simmering, because over 80°C the butter will burn. After some time an opaque residue will separate from the melted butter leaving a transparent liquid which is the ghee. The residue is discarded. How to ensure the solar oven does not overheat is discussed at the bottom of this page.

Heating milk

A box solar cooker is ideal for heating milk for drinking, cream making or other purposes, because the temperature range a solar cooker reaches will not burn the milk. Milk is sensitive to temperature over ca. 96 °C, it will simply burn and stick and an unpleasant odor will remain in the boiled milk. Here again the temperature range of the solar oven is the advantage.

Candle-making (melting wax)

Leftover wax candle stubs can be saved and melted down in a solar cooker, poured into a mold (paper cup, plastic bottle, coconut, etc.) to make a new candle. The wick: somehow fasten an organic-source string going from the bottom to the top of the mold.

Ironing clothes

AlSol irons

Traditional irons to be heated with a parabolic solar cooker.

Traditional irons did not use electricity, but had compartments where hot coals would be placed. They are still in use today. A suggestion that arrived from AlSol, is to take two irons and alternate between having one heated by a parabolic solar cooker, and one being used. Adding stones or clay into the compartment will add to the ironing time. A parabolic style cooker is best suited to provide the focused heat required for ironing.

Solar cooking advocate Pat McArdle has produced a short you tube video which demonstrates the ability of a parabolic solar cooker to heat water for tea in the snow when the outside temperature is below 30 degrees F or 0 degrees C. In the summer the same parabolic solar cooker is used to heat a traditional iron to press a linen table cloth. http://www.youtube.com/watch?v=1yOOxCnM6Ns

Insect killing of grains

In some areas and in some seasons, the grain storage of the family may be exposed to development of small insects in the grain. These insects might be mixed with grain! Getting these insects away from the grain may usually be a difficult task to be done manually. In Gujarat I saw that some families put their insect-exposed grain, bean, peas etc. in the solar cooker a few hours during a day or two, in this way the insects are killed due the heat of the oven while the grain, beans, peas etc. was not damaged. Afterwards the family could easily get rid of the dead insects by blowing them or using sieve.

Heating water for household uses

See Magnato Water Bottle Heater.

Coffee roasting

Main article: Coffee roasting

Soil sterilization

Main article: Soil sterilization

Making mosquito repellant

Smelting

Ventilation/temperature adjusting

During the study in Gujarat I observed that some families decreased the temperature and moisture developed in their solar cookers, by slightly opening the top glass lid of their cooker by temporarily creating a gap for the oven. This is indeed an easy and effective way to control the temperature/moisture within the oven. One can for example place a coin or a small glass ball to keep the top sash open. This is necessary specially when the sun is high and one should avoid high temperatures for some of the above-mentioned special uses for example when one is heating milk.

Distillation of water

Main article: Water distillation

Autoclave

Main article: Solar autoclave

Home heating

It has been reported that people have built a solar cooker to heat rocks for keeping warm at night. Adding a little water to the remaining rocks adds nice warm humidity to the inside air.

See also

All items (18)