Best Solar Oven Reflector Angle Installment I by curlydock

I wondered what the best angle for the flat solar concentrator or reflector of a box-type solar oven is. So, I conducted a little thought experiment.

figure 8

Fig 8 is a diagram containing three solar ovens, each with a reflector at a different angle. I will define the “reflector angle” as the smallest angle the reflector makes with the plane of the oven window while the reflector surface is exposed to the sun.

Oven A has a reflector angle of 90 degrees. At this angle, the reflector surface does not engage the sun, so it cannot increase the sunlight falling on the box-oven window. It is clear that an angle greater than 90 degrees will cause the reflector to shade the window, obviously not what we want.

Oven C has a reflector angle of 45 degrees. None of the sunlight reaches the oven window because all of the light is reflected parallel to the surface of the window. Also, as the angle becomes smaller than 45 degrees the sunlight is increasingly reflected back toward the sun itself instead of through the window. We don’t want that either.

So, the best angle must be between 45 and 90 degrees. Oven B has a reflector angle of about 60 degrees. I believe most designs use this angle. This angle is between 45 and 90, but is it really the best? Consider the simple average of 45 and 90. That is (45 + 90) / 2 = 67.5 degrees. The difference between 60 and 67.5 of 7.5 seems considerable to me. Might it be better to use 67.5 degrees as the relfector angle of a solar box oven?

This simple thought experiment ignores many complicating issues. It assumes the surface of the window is kept perpendicular to the solar rays. That is not absolutely necessary and may not be true in actual use. But, for the sake of analyis I let that be a constant. Most light is transmitted through a window when the incident rays are at 90 degrees. As the angle becomes more acute, less light is transmitted because it is lost by being reflected away.

That more light is reflected as the incident angle gets smaller has implications for the reflector as well as the window. It suggests that reflectors work better at smaller incident angles. However, as the incident angle diminishes, the reflector must get progressively longer to intercept the same amount of light.

Another assumption in this experiment is that it is conducted deep in outer space. That is not obvious, is it? In fact, only in outer space would all the solar rays arrive at the oven at the same angle. On the surface of our planet, there is a good chance a solar ray will arrive at our oven at almost any other angle than directly from the sun itself. There are many reasons for this. One is the atmosphere which refracts the sunlight. There are particles and clouds that diffuse and reflect the light. Many reflections can occur from the planets surface, some of which are very strong if the surface happens to be a body of water. (This suggests to me we should always paint the outside of a box oven flat black and then wrap the oven with something like bubble wrap.)

Also, real mirrors and windows have imperfections. In a more sophisticated simulation one might take those imperfections into account.

The fascinating complexity if this issue prompted me to build a small device I could use to empirically measure the best reflector angle for a solar box oven. Using the device resulted in a best angle of 59.6 degrees, close enough to 60 degrees! In another installment I hope to describe how that device was constructed and how it works.

Published in: on October 24, 2006 at 12:06 am  Comments (88)  

The URI to TrackBack this entry is:

RSS feed for comments on this post.

88 CommentsLeave a comment

  1. Curlydock,
    While appreciate the thought that you gave to the challenge. Nothing beats real world exerience.
    I suggest you get a couple cardboard boxes, some tin foil and plastic, and make an oven yourself. Aster cooking on a solar oven for over a decade…
    Well you’ll see 🙂
    Winter sun, summer sun are at different angles.
    Flexibility is the key.

    • lame lame lame lame follow me at lame.lame and snapchat at lamelame

  2. Chris Prelitz:

    If you check out other parts of this site, you will see I have done exactly that. In fact, my actual solar ovens came before both the computer simulations and some empirical experiments with some mirrors and a bead. All are documented in this blog.

    I was very pleased at the results of the actual oven, but I wanted to find the best design so that the minimal amount of raw material and effort would go into an oven having optimum performance.

    Thanks for your comment,

  3. Thanks,
    IT Helped me in a very important project
    But I heard that the angle between the glass cover and the reflector should be 45 degrees?
    Is that true??

  4. Pretty nice blog you’ve got here. Thanks the author for it. I like such topics and anything that is connected to this matter. I definitely want to read more on that blog soon.

    Best regards

  5. I want to know the difference between mirror and aluminum foil as reflectors in terms of efficiency

  6. If only more people would read about this.

  7. If only more than 31 people would read this!

  8. Incredibly awesome read! Honestly..

  9. Been cooking for the last month in my homemade solar oven.It’s a beauty. Built by my McGyver husband. Taking it to a Dutch oven cooking demo tomorrow afternoon to show off. I guess our angle to be about 50 degree. Solar and Dutch ovens. How cool is that? Like this site.

  10. Ever try a hybrid solar oven? These allow you to plug in when it’s cloudy, and use the sun when its not. Ultimate convenience and energy savings!

  11. I was working on this problem myself. The best angle to use is not a constant value; it depends on the length of the box and on the length of the panel that you are using. I derived an equation which yields the best angle to use for given lengths of the box and panel:

    tangent(2*(90degrees-beta))*sine(beta) – cos(beta) – x/y = 0

    where x = length of the box, y = length of the panel, and beta = angle at which the panel will reflect the most sunlight. Unfortunately, however, the formula only works when only 1 panel is used or (if more panels are used) if the panel length does not exceed the box length (because if the panel length exceeds the box length and two panels are used the panels can be used to reflect sunlight from the other panel into the box). It may take a while before I come up with a completed formula, as it gets much more complicated with two panels. And of course, my formula assumes ideal conditions.

    When the panel length = box length, the formula yields 60 degrees, just as you empirically verified.

  12. Cool post. Waiting for you to continue the topic.

    Kate Smith
    warsaw escorts

  13. Thanks for the great article. Very informative. What type of solar project have you built? I would be interested in where this research took you and what you concluded or created. Cheers!

  14. Thanks so much!!! it helped me alot in my science project when my science teacher didn’t tell what to do. Don’t be scared to do more of these kind of things. Thanks 😀 Bye 🙂

  15. Cool stuff! I will return for new info! Keep it up! And don’t forget to add even more images!

    21Jane 23Wilson
    Teen London escort

  16. Cooking in my solar oven for the first time as I’m typing. Up to 200F in 30 min. Yea! Will be building reflectors shortly. Have my oven mounted on a lazy susan on top of an old gas grill base. I can wheel it around and change the angle easily.

  17. Anyone who is motivated by the technique and know the procedure can do it.
    Even though technological developments have eased our lives greatly they
    have also generated the need for more power supply.
    Than you wrap the tabbing wire around that piece of wood.

  18. It is known to keep making the hair thinner and thinner
    until is will eventually be gone. You can also put the rosemary water in a
    sprayer and spray the hair every morning. Herein I will reveal the most common
    causes of hair loss and some popular methods to treatment.
    Hair Re-growth-hair loss remedies are available for both men and

  19. I’m not positive where you are getting your info, however good topic.
    I must spend a while studying more or figuring out more.
    Thanks for wonderful information I was looking for this info for my mission.

  20. Carry your child (who is mentioned FREE) and watch a fresh movie with other moms.
    The situation was the whole point out having a joke display is for this to
    become humorous.

  21. This will be the most affordable option for you if something has occurred
    to your Apple iphone. It becomes a multifaceted gadget able of a wide range of
    features. After all, what much more could you probably want?

  22. Thanks for your personal marvelous posting! I certainly enjoyed reading it, you could be a
    great author.I will be sure to bookmark your blog and definitely will come back someday.
    I want to encourage you to continue your great job, have a nice evening!

  23. Tout ce que vous-même appartenez être au fait en vue de se fournir véritablement votre imprimante
    3D éviter une saison sèche sérieusement sympathique.
    Profitez de votre impression 3D l’ensemble de votre filiation et
    également activement votre impression 3D

  24. Hyper sujet en ce qui concerne le casque pour moto sur des sites internet

  25. It’ll void your warranty. If you cannot follow instructions Do not try this.
    Make Use OF The iPhone in horizontal mode for Opera. It has a custom shealth rocker gear
    clip making it super easy to get the iPhone out.

  26. Supplier of Apple iphone tells the individuals as what all things
    they can install and what cannot be. You can manage&Ports
    with out having to eliminate the pores and skin. And it is one of
    which wont be gotten free.

  27. But there is no need for any concerns- because the Business has launched various add-ons.
    Not only has this, by availing a agreement mobile telephone deal
    1 gets a handset entirely free of price.

  28. You really make it appear so easy along with your presentation but I to
    find this matter to be really something that I feel I might by
    no means understand. It seems too complicated and extremely huge for me.
    I’m looking ahead in your next publish, I will attempt to get the grasp
    of it!

  29. tout pour se payer du ltc en promo par le réseau facilement

  30. Currently go to Options -> General -> Community and you’ll recognize something new – “Web Tethering”.

  31. High percentage of heart ailments occur post the age
    of 50, which makes cardio exercises a must. Build lean muscle and definition in your arms and upper body.

    Make sure they are not exposed to intense interactions with
    other animals that leave them feeling threatened
    and fearful.

  32. Acheter les emonnaies avec des forums de nos jours

  33. Precisely how do these types of pupils always be achieved?

    You just need to make sure you have a level quantity
    of terms for every single word. Request someone to imagine a tiny thing such
    as a cover.

  34. A good idea is by using a pci-express 2.0 card if you want to accomplish
    some hardcore gaming. That Nexus 7 includes a 1080g screen that smooshes 323
    pixels into each inch. Simply don’t affect me while I am chatting, alright?

  35. This becomes quite difficult when the parents both work full-time or have other siblings at home.
    They had fresh color books each week like they were candy.
    The cavities were between the teeth, not to the outer surfaces.

  36. Deliver MMS/SMS from Pc utilizing GSM modem or mobile telephone.
    However, other messaging solutions have far higher attain. This app will identify
    the tune with lyrics and artist info.

  37. JailbreakMe works with the iOS or later.
    Check out their rating with the Much better Company
    Bureau and also see how long they have been around. Jumping
    beans have usually been a popular novelty.

  38. Fantastic approaches to stay static in the “natural character”.
    This sport may be played many times in a row.
    Warner Brothers’ Harry Potter website has four full page Harry Potter coloring
    for youngsters.

  39. tout pour acheter du ltc anonymement par le réseau facilement

  40. This has been demonstrated to prevent cardiomyopathy in diabetic subjects.
    Following The first week to the Atkins diet, it was January 8, 2008 and I was down three pounds!
    Restrict consumption of extra and mutton sodium in your dinner.

  41. +I am when it comes to your cells what I am+ This well-known slogan is completely wrong.
    Put simply, without these beta cells, diabetes will be the result.
    Get Yourself A sample together with her recipe for
    breakfast devices.

  42. So, our first step is to update our Windows. All you do in this
    game is, faucet some randomly showing points
    on the display of your phone. Let us find
    out about the most well-liked messaging application.

  43. The main benefit of a non-sedentary lifestyle moves beyond weight loss.
    Occasionally, I was not even aware I was inactive.
    One of the finest Westerns ever filmed, and one of the finest movies of
    all kinds.

  44. Or might be you know the simplest way togo through PS3 security system?
    However the number 1 decide overall went to Super Mario Kart.
    For a lot of firms, virtualization is a wonderful engineering.

  45. The start menu is the most notable change for the conventional Windows OS.
    You will find there fundamental options for viewers:
    everybody, friends, and friends of friends. You need to be way too busy
    for all of the!

  46. It was a win win for both organizations and we’re worked up about the change.
    The present transaction with Cydia is an excellent chance for us.
    Apple can be rolling out a new iOS upgrade on March 11.

  47. Then click on the ‘get’ link next to any of the available tones.
    Download all the videos, television shows, games, and audio you want, anytime you want.
    The Food Network app is simply for you personally.

  48. candy crush Saga originated and created by
    He’s a great example of the man of his word. Click on take each
    time watching your XP rise. It’s likewise relentlessly and
    recent being enhanced.

  49. The truck exhibited of its graphics that was fantastic and exhibited the muliplayer aspects
    of the sport. Therefore it is not surprising that Phone 3 is the greatest killer
    application concept for the Xbox.

  50. The outward symptoms which show up, are those that are notable in the event of type-2 diabetes.

    In addition it assists in reducing your body’s resistance to insulin. Another
    approach to increase your fiber is greens.

  51. GTA San Andreas was the one which got before GTA IV.
    Their love for big gadgets is known to all. The concept is definitely an action sport developed by Ubisoft.

    And, oahu is the most silly thing I Have ever seen.

  52. Set of costs from the person with average skills doesn’t
    really apply here. Firstly, we need to find how
    to set the AssistiveTouch. You can also access the image files on your own iPhone using
    the application.

  53. Within the “Game Menu” you will see-the game which you’ve backed up.

    Thus, if you had a hectic weekend and didn’t
    notice about that, there you’re. Please avail yourself of
    the free supply and have a great time!

  54. This film is noteworthy since the main character struggles a great deal with killing people.
    Hellboy features a following, but this film might not be for everybody.
    They have lost control and fear due to their very lives.

  55. AT&T is offering 4 for USD 149.99 to a restored 16GB iPhone,
    and another 32GB iPhone 4 for USD 249.99. Launched from the designers of Facebook, this iPhone application delivers entry
    to your Facebook globe.

  56. If you posses some know-how of the Xbox hacking program, you’ll recall how
    easy it is. It is one of many best free applications for kids.
    It’s got individual iWork purposes for $10 each.

  57. The multiplayer could be the only location where this
    game truly shines. No longer would activities be restricted to the circuit board.
    We’re not sluggish, we are good despite the fact that we have nothing.

  58. The only method anybody recognizes this information is should your profile is visited by them.
    The American actor and television producer did some essential fashion options in the amount of 80’s.

  59. Mousehunt – Definitely my favorite software on Facebook.
    Ultra Defrag is an added exemplary program for fragmentation and marketing.
    Accept it and then press the ‘R’ key to run the repair version.

  60. WhatsApp supports many various message types, from easy text to pictures to audio files.
    It is one of the most secured system for sending messages and other mode of conversation the working method permit.

  61. No jailbreak means no uncover, easy as that.

  62. It can make your phone calls or send your textual content messages for you as well.
    Concerns are regularly added for fresh material. By doing so your telephone becomes
    a mini pc.

  63. Remember the Windows RT is really a distinct operating-system than Windows
    8 Expert. You may also arrange your libraries by day, style or kind.

    It’s quite simple to make use of Facebook advertising.

  64. Wow, superb blog format! How long have you ever been blogging for?
    you make blogging look easy. The whole look of your site is fantastic,
    let alone the content material!

  65. If the panel gets tilt slightly towards the side of the latitude, then there will be sufficient quantity of sunlight be received over the panel.

    140 James Street Venice, FL 34285-5527 Manatee County: (941) 366-6680 Sarasota County: (941)
    488-4453 Charlotte County: 941-743-4315 Toll Free: 1-866-777-WARM.
    What I am going to cover however, is more about why you may wish to throw
    up your own solar panel. If you’re seriously considering installing solar panels on your roof, this article will tell you how to go about it.
    This offer won’t be online forever, nor will these 5 free exciting bonuses last, so visit the website today and take advantage of this amazing deal.
    Don’t go for the cheap and low quality products otherwise you will be at loss on the long term venture.

  66. Commandez ce lissage capillaire du bresil sur la toile

  67. The formal Application Store has thousands of Iphone programs to provide.
    It is much less than 1 megabyte and is also extremely efficient.
    Send a Ping to the contact: You have to get the receiver attention for discussion.

  68. I do consider all the concepts you’ve offered in your post.
    They are really convincing and can definitely work. Nonetheless, the posts
    are very brief for novices. Could you please extend them a little from next time?
    Thank you for the post.

  69. I’ve been exploring for a little for any high quality articles or weblog posts on this sort of house .
    Exploring in Yahoo I eventually stumbled upon this website.
    Reading this info So i’m satisfied to exhibit that I have
    a very good uncanny feeling I discovered exactly what I
    needed.I so much undoubtedly will make sure
    to don?t overlook this website and give it a glance on a relentless basis.

  70. For the absolute most part, they are tailor made to ensure they fit correctly.
    The game concept isn’t simply updated and players are starting to look for more assorted game

  71. I was wondering if you ever thought of changing the page layout of your website?
    Its very well written; I love what youve got
    to say. But maybe you could a little more in the way of content so people
    could connect with it better. Youve got an awful lot of text for only having 1 or two pictures.
    Maybe you could space it out better?

  72. And the free space drops below 15% you will encounter a huge drop in effectiveness once this occurs.
    You’ll first need certainly to select where you desire to publish the images also, once
    the field starts.

  73. If you mess up following these directions, simply strike the “Back” button and
    try again. It is possible to make the most of all
    the totally free apps and use specialist software programs.

  74. However you can conserve a fortune when you buy refurbished products.

    Furthermore, this device is also well-liked as PS3 jailbreak.
    It is a well accepted fact that people vary in their choices of mobile telephone sets.

  75. E cum ar fi un medic care să ateste , “Hei ! Meta tag-uri sunt tag-uri care spun păianjeni ceea ce site-ul dvs. este axat pe .

  76. you are in reality a just right webmaster. The web site loading pace is incredible.
    It seems that you are doing any unique trick. In addition, The contents are
    masterwork. you’ve done a magnificent activity in this subject!

  77. Hello friends, pleasant piece of writing and pleasant arguments
    commented here, I am in fact enjoying by these.

  78. Spot on with this write-up, I truly believe this amazing site needs much more attention. I’ll probably be back again to read more, thanks for the information!

  79. Very soon this website will be famous among all blogging and site-building viewers,
    due to it’s good posts

  80. Eu însumi sunt un adevărat londonez … născut și au crescut ,
    de zi cu zi nu este ceva nou pentru a fi descoperite .
    Există … și ciocolata semi – dulce , verde – ceai și boabe de întuneric sunt
    ALL stoc ambalate cu ei . Site-ul este fără apărare SEO’d .

  81. Good day! This is kind of off topic but I need some help from an established blog.
    Is it difficult to set up your own blog? I’m not very techincal but I can figure things out pretty fast.

    I’m thinking about creating my own but I’m not sure where to start.
    Do you have any points or suggestions? Cheers

  82. Hey, I think your website might be having browser compatibility issues.
    When I look at your blog in Safari, it looks fine but when opening
    in Internet Explorer, it has some overlapping. I just wanted to give you a quick heads up!
    Other then that, very good blog!

  83. Hi there mates, its fantastic piece of writing regarding educationand entirely explained,
    keep it up all the time.

  84. Mutați grija ta : Nu trebuie să transpiri dilemele
    mici pentru sigur . Va transforma cu siguranta le pe
    și acestea sunt de gând să-și petreacă mai multe
    ore în partea ta de podea de dans .

  85. drapery Ideas

    Best Solar Oven Reflector Angle Installment I by curlydock | Green Man Waiting

  86. It’s in reality a great and helpful piece of information. I’m glad that you simply shared this helpful information with us. Please stay us informed like this. Thanks for sharing.

  87. 車輪が隠れるようにして、車体を持ち上げて移動してください。レディース ダウン ブランド

Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

%d bloggers like this: