Solreka - Brighter energy solutions

Alternative Energy, Solar Power News Blog

How to Build a Parabolic Solar Cooker

SolReka Parabolic Solar Oven

Building a parabolic solar oven really isn’t as difficult as it may seem, once the basics are first understood.

There are many popular solar cookers in use today, including the Sun Oven, Sports Solar Oven, and the Cookit, to name but a few. However they all adopt either the solar box or solar trough design. Very few designs are actually parabolic, those that are, are generally quite expensive like the SK-14, compared to the more popular designs. The box solar cooker for example, is simply a cardboard box with reflective panels and a pane of glass which traps hot air in a box.

So what is a parabolic solar oven?

The sun’s rays are collected using a reflective surface like a parabola or curved surface. The main difference between a parabolic solar oven and other solar cooker designs is that the parabolic shape focusses the sun’s rays into one point; called the focal point. A small focal point means a greater concentration of solar energy. With a parabolic solar oven, it is possible to cook food at the same rate that food is cooked in a conventional oven.

Parabolic solar cookers are considered to be a better alternative for outdoor cooking and camping as they require no firewood or the need for gas stoves and they offer fast cooking times.

Why build a parabolic solar oven?

Building a parabolic solar oven will result in a higher power output than other solar cooker design. Remember, the smaller the focal point, the higher the cooking temperature. Water can be boiled in seconds using a sufficient sized parabolic cooker. However, due to the high level of accuracy required in the manufacture of parabolic cookers, a minimal focal point is very difficult to obtain.

Very high cooking temperatures can be obtained with a parabolic solar cooker, thus drastically reducing the time taken to cook food and to boil water. The box design solar cookers generally take several hours to cook food.

To summarise, building a parabolic solar cooker offers faster cooking times than other more conventional solar cooker designs. However, bear in mind that parabolas need more frequent adjusting, pointing to the sun.


Save Money On Gas Today. Click Here Now!

How do I build a parabolic solar oven?…

Several methods are available, one easy and ready-made solution is to use a satellite dish. Then line the inside of the dish with a reflective material such as aluminium foil, or better still Mylar. Anodized aluminium could be used, even small segments of mirror. However, the focal point would become ‘scattered’ as the mirror and anodized ally would not give a true parabolic shape.

After researching and testing countless parabolic and general solar cooking designs, the following conclusions have been made: -

  • First of all, work out what size parabola you want to build. As a rule of thumb, every one square metre of reflective surface equates to 1kw of solar energy. This isn’t quite the case for a paraboloid due to its shape, but the rule will suffice. A one metre diameter parabolic which has been engineered to a high spec will pump out more than enough heat to boil water in a few minutes.
  • 800Watts or more of solar energy is sufficient for cooking your solar food.
  • Establish a focal point. Let’s assume you Solar parabolic cooker how to build correctlyare building a one metre dish. A suitable focal point would be approximately 20cm as in Figure 1.

Figure 2 shows a focal point of 25cm which wouldn’t produce the same results as the focal point of 20cm. Solar parabolic cooker build incorrectThis is due to factors such as wind, stand design, and cooling effects. With the cooking vessel situated at a focal point of approximately a third of the way down from the top of parabola, this will ensure sufficient wind protection, as well as an area where the heat is ‘captured’ and retained.

The picture at the top of this post shows one of my earlier parabolic solar cooker designs. Note the depth of the cooking pot, in relation to the actual dish. This oven reached temperatures in excess of 300F (80cm diameter). My current design is lighter (easy to carry in any backpack), sturdier and more powerful.

For more information on building a parabolic solar cooker, visit parabolic cooker kits section

It is also important to choose the right cooking pot for the cooker. It has to be dark in colour and placed in the correct position, namely in the middle of the focal point. It also needs to be oriented to the sun and placed on a small stand that sits at the point of focus for the oven.

Parabolic solar cookers can work for 60 to 90 minutes unattended. If you find that the food is not cooked or that another pot has to be heated, then simply adjust the dish to point to the sun every 15-20 minutes or so.

One final note, if the focal point is too low or too shallow, i.e. a very deep parabola as in Solar parabolic cooker build deep dishFigure 3, then the sun rays will ‘bounce’ on the top and sides of the cooking vessel, and not from underneath as they should do. It is also very difficult to manufacture – ref incorporating stand with a deep shaped dish. There is also a smaller surface area, in that the sun’s rays only penetrate whatever diameter the dish is set to, irrespective of depth.

Figure 4 shows the opposite of a deep parabolaSolar parabolic cooker build shallow dish. This design is workable, providing a relatively large diameter dish is used. Factors such as the wind and insulation of cooking vessel must be taken into account for this audacious design. Many satellite dishes have a focal point just outside the depth of the dish. This is due to ease of manufacture and optimal threshold for capturing frequency bands.

Suitable materials for building a parabolic solar cooker.

- Reflective chrome vinyl, highly reflective material which also comes with an adhesive backing. For more details visit solar cookers reflective vinyl section.

- Finished anodised aluminium or mirrors (expensive).

- Mylar – used in hydroponic set ups.

- Aluminium foil – cheap and cheerful, however creases and tares can play a large part in the build. Foil is a great starting point as it’s cheap and readily available.


So now you have a good understanding of what a parabolic cooker is and the main concepts needed to start building your very own parabolic solar cooker. So, what are you waiting for… :-) Happy building.

I will happily include any photos you submit of your parabolic solar cooker for fellow readers to enjoy, learn and share tips and tricks about the wonderful world of solar cooking. Email your photos.

Here are some great links which will help you with your journey for building you very own parabolic solar cooker:

Solar parabolic cooker kitParabolic Solar Cooker kits ———>



 

parabolic solar cooker templatesParabolic Solar Cooker Templates ———>



 

reflective chrome vinylReflective Chrome Vinyl ———>



 

General introduction to Solar Cooking
www.solarcooking.org
Instructions for building a parabolic solar cooker

82 Responses to “How to Build a Parabolic Solar Cooker”

  1. VernNo Gravatar Says:

    I really enjoyed your article Rob. I look forward to its release. If I remember correctly I believe you estimated the temperature at the focal point of the 80mm to be slightly more than 300 degrees Fahrenheit? i may have gotten that wrong….Vern

  2. SolRekaNo Gravatar Says:

    Vern,

    Many thanks for those kind words.

    You are correct, temperatures in excess of 300F have been obtained with the 80cm diameter dish. Please note that the results were recorded in England (weather – occasional cloud cover, temp average 22C)

    I can only dream of seeing higher temps in other, warmer climates.

    I look forward to receiving reports from SolReka users from from off lands where temps typically reach the high 20′s, low 30′s.

    Larger dishes will become available, and customers will have the chance to order bespoke (any-size) parabolic dishes. However, I must currently focus my efforts on bringing the 80cm to market, subsequent parabolas will follow soon afterwards.

    Regards
    Sol

  3. JaneNo Gravatar Says:

    although I cannot fully appreciate the way the cooker is going to be built, you’ve got me interested such that I’ll probably ask my daughter to build one for me. thanks for sharing.

  4. SolRekaNo Gravatar Says:

    Hi Jane

    I’m glad to hear that you are going to have a go at building the parabolic solar oven with your daughter.

    What a great way to learn all about about solar cooking by sharing your ideas, thoughts and experiences with your daughter.

    I would love to know how you get on, I will be more than happy to post a photo of your parabolic solar oven on my blog.

    Let us know if you have any more questions. I will be only too happy to help.

    Regards
    Sol

  5. DagnyNo Gravatar Says:

    Thanks so much for sharing all this information. Sounds like a great thing for camping. Can’t wait to try one out.

    Dagny
    http://www.onnotextiles.com
    organic apparel

  6. colleenNo Gravatar Says:

    Super article Rob. Parabolic cookers definitely qualify as dorkage. I’m gonna see about building something like this. I built an “oven” when I was in Costa Rica, consisting of reflective panels which I set up around my hotplate, then my only cooking implement. I set up a rack over the hot plate and put the scones on it. It worked pretty well all things considered.

  7. Green AuthorsNo Gravatar Says:

    I love solar products but I have not seen one of these since I was a kid. We use to play with a 12-16″ dish to heat food. Once I finish my composting project this looks like a perfect project!

    Green Authors’s last blog post..Unisolar 64 Watt Thinfilm Panel: RV Solar Installation | Renewable Energy Resources

  8. greenauthors.com Says:

    How to build a parabolic solar oven | SolReka – Solar Cooking and Alternative Energy News…

    A guide showing you how to build a parabolic solar cooker. Other designs also available including the pizza box and cone solar cooker.
    SolReka…

  9. SolRekaNo Gravatar Says:

    @Green Authors
    Great website you have, a digg site for all things relating to alternative power – nice

    I wrote an article regarding the building of a parabolic oven and posted it on your website

    Many thanks for dropping by.

  10. Vote for this article at blogengage.com Says:

    How to build a parabolic solar oven…

    If you enjoyed reading this post, why not vote on blogengage.

    BlogEngage – Vote

    Your votes are most welcome.

  11. RKRAONo Gravatar Says:

    I have seen your interesting note on solar oven;it must be very efficient;but how much does it cost?; there are a number of interesting models like yours;their main disadvantage for use by the poor in countries like India and Africa is their cost; I designed a solar cooker with a semi- paraboloid shaped bamboo basket[available locally in most Indian rural and forest villages] for Rs.40[80 cents]; for the reflecting surface I used locally available ‘eating plates’-these are paper plates of 15′ diameter coated with a thin foil of Aluminum or a silver colored polythene film-;each cost Rs.1.25[2 cents!] ;five or six of them will be adequate;in all the cost does not exceed one dollar;it cooked rice in two hours;the cooking time can be brought down by fine tuning;the rice was put in a Aluminum vessel enclosed in a black polythene bag or in a glass vessel;the glass vessel was quicker in cooking. i wil send some photos by next post.
    RKRAO

  12. SolRekaNo Gravatar Says:

    @RKRAO
    Hi Krishna
    Great feedback on your solar cooker, it just goes to show how cost effective solar ovens can be.

    I wish you the best of luck with your venture.

    May I post your pictures of your solar oven on my blog, I’m sure fellow readers would love to see your oven in action.

    Regards
    Rob

  13. How to build a Bamboo Solar Cooker | SolReka - Solar Cooking and Alternative Energy News Says:

    [...] The bamboo solar cooker is a simpler version to that of the parabolic solar cooker. [...]

  14. Ashok Patil AthnoorNo Gravatar Says:

    We want to give this as a project to 10th std. students of our Lions School,situated in Raichur,Karnataka,INDIA.

  15. RKRAONo Gravatar Says:

    asok patil can contact me at rkraoifs@yahoo.com if any help is needed besides what was given on this website;the students should read the note given here to locate the crucial focal point; a one meter diameter bamboo basket wowld be adequate under the indian sun.
    rkrao

  16. Sock YeeNo Gravatar Says:

    Hmmm…it doesn’t look easy to me but I think there’s no harm in trying to see how it goes. Maybe I’ll take it up as a project and get few of my friends to help me on this. It interests me because I’ve seen other similar models before and I’m sure this one is quite similar.

    Sock Yee’s last blog post..Common mistakes made by aquarium owners

  17. SolRekaNo Gravatar Says:

    @Sock Yee
    I am currently compiling an ebook which will show you how to build a parabolic solar cooker.

    Stay tuned

    SolReka’s last blog post..The Joys of Money and Power

  18. Science & Mathematics » I need advices for making a solar oven? Says:

    [...] http://solreka.com/blog/solar-cooking/ho…Hope that helps, good luck. Posted by Brad on September 25th, 2008 | Filed in Engineering | [...]

  19. gabeNo Gravatar Says:

    is it possible to get a reflective parabola to boil water to make steam enough to power a turbine/dynamo thing to make electricity? – as far as i know all of the forms of energy we use to get electricity are still just heat sources used to make steam (even nuclear) – i live in australia so we have plenty of sun.

  20. SolRekaNo Gravatar Says:

    Hi Gabe

    Sure thing, I’m very close to finishing my website. Part of the product offerings include ebooks which show you how to build your very own highly accurate and powerful parabolic solar cooker, as well as self-build parabolic kits.

    So keep watching this space in readiness for the launch of my website.

    SolReka’s last blog post..Project Bluebeam – Holographic alien invasion

  21. gabeNo Gravatar Says:

    what sort of turbine system would you recommend for a large parabolic dish say i.5metre diameter? how much electricity could be produced?

  22. SolRekaNo Gravatar Says:

    Hi gabe
    I’m afraid I cannot answer that question for you. Suffice to say a 5m parabolic is massive in both size and power output.

    For every 1 square metre of sunlight you can expect to produce approximately 1kW of energy. So a minimum of 5kW cou ld be anticipated for a 5m dish.

    Perhaps a Stirling engine array would be a more suitable application for such a dish.

    I hope this has helped somewhat.

    SolReka’s last blog post..Project Bluebeam – Holographic alien invasion

  23. SolRekaNo Gravatar Says:

    To read more information on making a parabolic solar cooker, please visit SolReka’s brand new website; http://www.solreka.com.

    Here you will find information you need for building your very own fast, portable, and efficient solar cooker.

    Regards
    SolReka
    Brighter Energy Solutions

    SolReka’s last blog post..SolReka Website Launch

  24. harishNo Gravatar Says:

    Great work!!!

    We should be grateful to you for your efforts in educating us in alternative energy.

    Thanks friend…

  25. SolRekaNo Gravatar Says:

    Hi Harish

    Many thanks for those kind words. I can’t wait to share with you the wonderful world of spinning neo magnets.

  26. How to build a Bamboo Solar Cooker | Solar Energy | Solar Cooking | Alternative Energy | Conspiracy | Blog Says:

    Collapse of WT7 building 23 minutes before it actually happens. Different types of free energy. How to Build a Parabolic Solar Cooker. Solar energy – The ideal solar cooker. DOOMSDAY FEARS SPARK LAWSUIT OVER HADRON

  27. AlexNo Gravatar Says:

    Thanks, add in my social bookmark http://www.googletop.net

  28. DidacNo Gravatar Says:

    Hey,

    Thanks for the information, it will be so helpful for my senior project which actually consists on making one of these

  29. XellossNo Gravatar Says:

    I’m trying to make a quite fast blueprint, as to recreate the solar cooker you have shown at the top of the blog. If i may ask; what was your equation for that specific cooker?

  30. SolReka | Parabolic Solar CookersNo Gravatar Says:

    Equation for a parabola is: -

    y = x squared / 4p

    p is the focal distance of the parabola

    I hope this helps.

  31. XellossNo Gravatar Says:

    nevermind on that, i had some spare time. Sorry for this double post, but is their any chance you could tell me what you used to support/attach the vinyl to on the solar cooker (Version 5)?

  32. SolReka | Parabolic Solar CookersNo Gravatar Says:

    Sure thing Xellos

    Regarding attaching the vinyl to a suitable backing material. For the version 5 build solar cooker I used PVC sheeting as the backing material.

    However, if you look closely at the picture, you can see that the shape isn’t reinforced due to the ‘flimsy’ nature of PVC. (difficult to see in picture)

    I then moved onto 1.5mm HIPS and plastic sheeting for the backing material, as a result the parabolic cooker now produces much better results. Easily reaches temps over 150C.

    Please let me know if I can be of any further assistance.

    For more information, please visit: -
    http://www.solreka.com/solar-cookers.html

    Regards
    Sol

  33. MichaelcNo Gravatar Says:

    In the text you mention the cooker being foldable, but none of the images i could see show that.
    I think it all would be clearer if you separated the info about solar cookers in general from the info about the specific cookers you are selling. There also does not seem to be any info on mounting the dish for tracking the sun.

  34. RavenNo Gravatar Says:

    Thanks so much for the detailed information. It’s so hard to find helpful content like this nowadays… especially with diagrams, etc.

  35. sumeet kumarNo Gravatar Says:

    Great artical…i recently made one funnel cooker but it could not cook rice…my intension is to look a cheaper option to make solar cooker. I want to spread this knowldge to my nearby tribal community.
    I think parabolic is a good option becase people here in Indian village like to cook rice as normal day routine.
    It would be great if you could suggest a simple way …like making parabolic with umbrella and easy method to determine focal point.

  36. RKRAONo Gravatar Says:

    Plese see the bamboo solar cooker in this website;the bamboo baskets are available in all tribal communities;using it as the base and following the design principles given by solreka you can make a low cost parabolic solar cooker.

  37. RKRAONo Gravatar Says:

    Please see the bamboo solar cooker in this website;these bamboo baskets are found in all tribal areas;using them as the base,you can make a low cost cooker following the specifications for diameter,depth and focal point given by solreka.

  38. Robert SloterNo Gravatar Says:

    for SumeetKumar or any one else

    I am in the process of building a solar cooker, my intention is to make a solar box or
    clear box with a top, to aim the Parabolic Dish at it i am going to try an item called
    a Laser Pointer, it is a small light with a very focused beam. If you can not find that
    try a flashlight aimed at the Parabolic dish at night to set the focus.
    Robert Sloter

  39. Mumbere Mughumalewa JeremieNo Gravatar Says:

    Please,I would like to know how to build my oun solar cooker.cause you do not give all detail for building.I am congolese here in BENI

  40. SolRekaNo Gravatar Says:

    Sure thing. SolReka offers a range of solar cookers for you to build.

    Please check out: -
    http://www.solreka.com/solar-cookers.html

    Let me know if I can be of any more help.

  41. SolRekaNo Gravatar Says:

    Don’t think you will have much success with building a parabolic cooker with a laser pointer.

    A pen, ruler, and piece of paper will serve you much better.

    Try this site if you want to have a go at building a simple parabolic solar cooker.
    http://www.mmwindowtoart.com/drawing/para1.html

  42. SolRekaNo Gravatar Says:

    The bamboo cooker is a great example of how simple a solar cooker can be to build.

    I would be more than happy to provide any more information on the construction of any type of solar cooker.

    Regards
    Sol

  43. SolRekaNo Gravatar Says:

    Thank you RKRAO

  44. Renewable RayNo Gravatar Says:

    My readers love this kind of stuff, let me know if you would like me to post as a guest blogger at our site http://doityourselfsolarenergyprojects.blogspot.com

    Ray @ New World Solar

  45. vermaNo Gravatar Says:

    design and details of parabolic cookers have been discussed only, but important part of cooker is cooking pot design & material. My experiance tells me that glass ware pots or borosil types of vessels or empty glass bottles/jars are very good option. cooking rice in transparent glass vessels help you to know the state of cooking. covered metal pots is devoid of this advantage. poor peaple use low quality aluminium vessels. acidic effect of vegetables like tomoto corrades or dissolve highly harmful aluminium alloys in food. taste is bad. glass is inert and does not react with food chemicals. could you please design a double walled toughened glass cooking pots of say 1 to 3 litre size. waiting for your suggestions on cooking pots made especialy for use with solar cooker. thanks. Lt Col Dinkar Verma.

  46. vermaNo Gravatar Says:

    suggest something on cooking pots mde of glass ware. poor peaple use low quality cheap aluminium alloys pots. it is bad as acidic effect dissolves aluminium matter in food at high temp. tamrind tomoto etc. reacts with food chemicals. transparent glass helps in knowing in state of rice cooked. borosil brand of cookware stuff is good but expensive. empty glass bottles or 1 kg jars are good option. can we get double walled cooking pots made of toughned glass materials in say 2 to 4 litre size. request forward your comment . thanks yours truly Lt Col D Verma.

  47. SolRekaNo Gravatar Says:

    Cooking pots is an interesting subject. It depends on which design of solar cooker you use. For a box type cooker, a good insulating cooking pot is essential. One that retains the heat such as an iron pot.
    Conversely, for parabolic cookers, due to the intense heat produced, any cooking vessel will suffice. Just make sure you don’t use something which spontaneously combusts when placed in the focal point.

  48. dljoneNo Gravatar Says:

    I’m doing a solar cooker for a college project. I’m using a satellite dish, and aluminum foil. i know how to find the focal point. we have to be able to cook a cookie in the cooker. could i just get a plate on the focal point and put the cookie on it?? and will aluminum foil “foil” my project??

  49. SolRekaNo Gravatar Says:

    Is it a box or parabolic cooker you are building? Simply placing a cookie on a plate might not be enough. May need to thermally insulate plate, or use a high convection plate which will easily radiate heat and in turn cook your cookie. All the best with your endeavour.

  50. Alternative Solar EnergyNo Gravatar Says:

    Thank you for sharing this information. It was great! I’ve never seen it yet.

    http://alternativesolarenergy.co.cc/
    Alternative Solar Energy
    .-= Alternative Solar Energy´s last blog ..Alternative Energy for the Home =-.

  51. maximino arturo alcala de stefanoNo Gravatar Says:

    A quien corresponda, muy interesante y entendible la forma que describe la estufa solar parabólica.
    Tengo dos preguntas para usted:

    AA. Tengo una ANTENA parabólica hecha de malla( la compre en USA, yo vivo en la Ciudad de Mexico Capital). La quiero usar como estufa solar, sin embargo el punto focal se encuentra casi a la distancia del fondo de la parabolica. debo de modificar el punto focal y como?

    BB. Con que material la cubro?. Gracias de antemano MAx

  52. SolRekaNo Gravatar Says:

    @maximino arturo alcala de stefano
    No idea what you said. but it sounded cool. Hope you aren’t spamming my blog :-)

  53. CatherineNo Gravatar Says:

    Spanish to English translation
    To whom it may concern, very interesting and understandable form that describes the parabolic solar cooker.
    I have two questions for you:

    AA. I have a satellite dish made of mesh (the buy in USA, I live in Mexico City, Capital). I want to use as a solar oven, however the focal point is almost the distance from the bottom of the dish. I need to change the focal point and how?

    BB. With that material I cover?. Thanks in advance MAx

  54. Why Choose A Parabolic Trough for Solar Thermal Power? | Tesla Power!! Says:

    [...] kind of parabola works best?  Thanks to the folks at another solar blog for cooking, a focal point of 2/3 the height of the parabola works best for ultimate wind resistance, [...]

  55. Nathalie BernerNo Gravatar Says:

    Me and a few friends are building one of these as project for math class. Thank you for this article, it was very useful.
    Do you happen to know whether an emergency thermal blanket would work as well as tinfoil? And also, have you found a particular equation that works particularly well?
    I’d greatly appreciate any advice. Thanks!

  56. JuaquinNo Gravatar Says:

    Can’t wait for my cup of noodles, counting down 5 minutes left

  57. mikelNo Gravatar Says:

    This shit doesn’t work, fuck solar powere

  58. SolRekaNo Gravatar Says:

    @mikel
    ??? How so.
    I have a video here of my own cooker working perfectly. And this is in the UK where we never get any sun.
    http://solreka.com/blog/solar-cooking/my-home-made-parabolic-solar-cooker/

  59. SolRekaNo Gravatar Says:

    Juaquin
    I’m jealous :-) Let us know how your noodles taste using only the glorious power of the sun. Where are you located? What cooker did you use, size, shape. What is outside temp?

  60. lalalalalaNo Gravatar Says:

    noob

  61. curiouserandcouriouserNo Gravatar Says:

    Hi, thank you for your article! This is something that has interested me for over a year, but I am just now delving into it. Love the simplicity of the article.

    I am considering having my 5th grader and 2nd grader do this as an incredible science experiment. We have an old DishNetwork dish that isn’t anywhere close to being 1 meter across. I think it’s more like 18 inches. I assume that would still work just as well as long as the focal point is centered properly? We live in Florida where we have hot, hot, hot sun to start with. I am so interested in this. Any suggestions when building this with young students? Should I have them start with aluminum foil for simplicity’s sake or do you suggest something else?

    Thank you!

  62. SolRekaNo Gravatar Says:

    Keep it simple. Foil and cardboard boxes is all you need to harness the power of the sun.

    Check out – http://solreka.com/blog/solar-cooking/build-a-simple-solar-cooker/

    Have fun. I wish I lived somewhere sunny. I would cook all the time using the sun.

  63. ChibiHoshiNo Gravatar Says:

    What are the drawbacks to Mylar aka why is it third on the list? Will emergency blankets work (cheaper and decent size) or doesn’t it have to be the hydroponic kind (similar in cost to chrome vinyl)?

  64. SolRekaNo Gravatar Says:

    Hi ChibiHoshi

    Mylar is great for solar cooking, so is kitchen (aluminium) foil, chrome vinyl, cds, basically anything which reflects the sun will work fine. The higher the reflectivity the better the performance of your solar cooker. Mylar and chrome vinyl have a reflectivity of approx ~ 98%, so these are the preferred materials to use as they are the most cost effective.

    Emergency blankets and food wrapping foil would work fine. Perhaps best used on box type cookers as you can stretch these materials out and get rid of any creases/folds.

    From all the various methods and materials I have tried when building solar cookers, I have to say that the parabolic design with chrome vinyl is the most cost effective method which produces the best results.

    Let me know if I can be of any more help. Happy solar cooking.

  65. JohnyNo Gravatar Says:

    Can you comment on this design and investigation?

    http://www.youtube.com/watch?v=uX9Z-nsUHiA

    http://www.youtube.com/watch?v=9eY0xh23Anc

  66. SolRekaNo Gravatar Says:

    Hi Johny

    The videos are too complex in my opinion. Over-engineering of a simple problem. Parabolic shapes need to be highly accurate in order to make them efficient to use. Hand drawing parabolas will create more of a bowl shape than a parabola.

    The best way to create a parabola is to use a simple piece of CAD software and to have a good understanding of how parabolas work ref parabolic equation.

    Hope this helps.

  67. Cynthia JNo Gravatar Says:

    My experiance tells me that glass ware pots or borosil types of vessels or empty glass bottles/jars are very good option. cooking rice in transparent glass vessels help you to know the state of cooking. covered metal pots is devoid of this advantage. poor peaple use low quality aluminium vessels. acidic effect of vegetables like tomoto corrades or dissolve highly harmful aluminium alloys in food. taste is bad. glass is inert and does not react with food chemicals. could you please design a double walled toughened glass cooking pots of say 1 to 3 litre size.
    Cynthia J´s last blog post ..career organizing

  68. cacarlNo Gravatar Says:

    I once saw a documentary film here in our place about non-government organization who train local peasants on a remote area to make something, sort of solar energy needed for their house lights and appliances. This was really given much attention by this people since the government seems to forget people in the hinterland or budget for this saw spent somewhere else. The town’s people was very thankful about this since they can already watch television after a days work in the farm or they have lamps on little store where they used together around after dinner. This is very helpful since electric bills are goingup every year. This is a big help for end consumers.
    cacarl´s last blog post ..Hosted PBX Services

  69. Terrell SchweersNo Gravatar Says:

    How can I get more people to visit my blogger site?

  70. reportNo Gravatar Says:

    Wow, it’s nearly impossible to find knowledgeable people in this particular topic, but you sound like you know what you’re talking about! Thanks

  71. SolRekaNo Gravatar Says:

    I don’t know much about the world, but I do enjoy sharing what I know about solar (parabolic) cookers.
    Thank you for stopping by.

  72. bibliotheque sandyNo Gravatar Says:

    Request Exchange of Box-type Solar Cooker with – One Small Parabolic Solar Cooker.

  73. curso de inglesNo Gravatar Says:

    Needed to post you one very little remark just to thank you so much again with the beautiful suggestions you have documented on this page. This has been simply pretty open-handed with people like you to present openly just what some people would have marketed as an ebook to help with making some cash for themselves, primarily seeing that you could possibly have done it if you ever decided. These tactics additionally acted to provide a easy way to recognize that most people have the identical fervor the same as my own to find out a little more when considering this problem. I know there are several more enjoyable moments ahead for many who discover your website.

  74. BobNo Gravatar Says:

    NIGGA PLEASE THAT SHIT IS STUPID GET A REAL OVEN

  75. plastic casesNo Gravatar Says:

    Do you know Google? For such question make a habit to just google. you will get very detailed answers satisfying you entire curiosity.

  76. BobNo Gravatar Says:

    wtf….. when r you gonnnab use that stit… ibet it will take like 2 hours
    to jus cook some hot winnersss….. lol… did yu know that global warming was made out of fart… o

  77. Aniket KumarNo Gravatar Says:

    Can a upside down umbrella be ued here instead of satellite dish ?
    Reply back soon its urgent…………………………………………

  78. SolRekaNo Gravatar Says:

    Yes

  79. ChatlineNo Gravatar Says:

    Thanks for your beneficial post. As time passes, I have come to understand that the particular symptoms of mesothelioma cancer are caused by the build up of fluid regarding the lining on the lung and the breasts cavity. The infection may start in the chest vicinity and multiply to other body parts. Other symptoms of pleural mesothelioma cancer include weight-loss, severe inhaling trouble, vomiting, difficulty eating, and puffiness of the face and neck areas. It ought to be noted that some people living with the disease do not experience just about any serious signs at all.

  80. VictoripadNo Gravatar Says:

    How height is the focal point if i use a high-circular box with 400mm radius?

  81. Betty-BitcoinNo Gravatar Says:

    Good Day Mate, I am commenting from Ballarat Australia. We have had a lot of wind the last few weeks and I’ve only just been able to log onto the blogsphere Thanks so much for the thoughtful article. It helped me a lot with my university design assignment. God Bless the internet !

  82. SolRekaNo Gravatar Says:

    My pleasure Betty-Bitcoin. Are you a fellow crypto miner?

Share your thoughts

Comment

CommentLuv badge

SolReka Divider