Hot Air Collector
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- Опубліковано 23 бер 2011
- Hot air collectors are primarily used to supply solar heat to a house in winter. They may be mounted vertically on the side of a house to take advantage of the oblique angle of a winter's sun. These home made collectors can be active or passive. By adding a fan to a passive hot air collector and making it active the heat collection efficiency is improved.
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Ingenious to utilize metal stud stock as the frame. So many advantages to this choice for material.
Very intriguing scientific analysis of this systems efficacy. I believe the best solar air/water heating project video I've ever scene. Great idea for a video, this will help anyone interested in this alternative energy more than any other. Thanks for posting!
This is the best idea ive seen on these yet...im gonna build one now...thanks, this is brilliant
Here is an idea for people who have brick homes... build a box on the surface of you're wall with the most sunlight, make the glass/plexy 1-2 inches above the brick. choose to paint it black or not it will still work well. It will catch and STORE the heat so it works in the night, get a cheap thermostat so it will cut off in the night and not blow cold air.
@xtomkx ... Thank you.. I love working with polyester felt. It seems to last forever. It works best for hot water systems.
Very cool using thermodynamics to regulate heat.
Thank you Meltingfaces. There are many solar thermal alternatives to oil. Once you understand the concepts the practical applications come easy.
Well done,and Scott Joplin forever !
Great
thank you so much for sharing this video, my project was completed because of this..
Good for you. Keep on trucking.
Hello! love your videos.. they are interesting and very useful too.. keep it up!
Thank you. DIY solar hot water is probsably most cost effective
Hot air collectors are needed at every presidential debate.
@CheapEnergyIdeas Thanks for the comment. I like your handle... I thank your are right. polyester would probably exchange more heat in a water environment. but I do believe this concept could be developed and it is cheap...
Nice details on the project John.
I would like to hear of your recent results on this project.
And appreciate your interest in sharing .
Tx.
Thank you
I just made mine out of soda cans and it sure if very effective and I save a lot..
@water4fuelh20 Thank you I very much like making these videos and I appreciate your comment. Music seems to pull the videos together,,, Pu8t the sun on your team...
thanks for sharing
Excellent
using thermosyphon principles used in heating hot water... a two foot drop is necessary from the cold supply from the house into the bottom of the collector. Here in NC where I am the optimum angle is around 60 degrees. Old houses, with south facing DOUBLE HUNG windows are prime for this example. A design would allow for installation by simple hanging in the window and storing away in summer. Fans would not be necessary if the added drop in cold supply is over 2 foot. A series of troughs, covered in mylar, reflecting on collector tubes inside an insulated box would gain a more consistent heat over the day and around here you can get old sliding glass doors for freel.
sounds good Chris
Nicely done. I see 5 people do not know how to work a cordless drill... that is sad. Thumbs up!
great stuff
Zodiak34 π´´πππποοο
I also prefer metal studs because the weight saved and ease of use. I also saw a model like this that used a water-closed-loop system because once water is heated, it stays warmer. The downside is you need full sun all day to heat the water. The loop was built with flex poly tube and a small solar pump with a Gott cooler for storing the water. Anyway, just another idea.
11:22 These 3 large panels are vaccuum tubes, they are extremely efficient
I bought the studs, bought insulation and polycarbonate in 8x4, bent the stud metal around it. I bought screen rather than felt. I'm interested in the felt.
I wonder if the suntuf was sprayed flat black, and it was laid horizontally instead of vertically. Then you would take advantage of the upward momentum of the air. Hmm, interesting
how much difference in heat gain is there between felt, soda cans, downspouts or roofing(corrugated) all painted black?
If your south facing house windows are clean inside and out, I fail to see how a shiny metal box of the same dimensions is going to grab more heat. At sunset, pull the insulated panels or drapes into position.
Nice
One thing to consider is durability. I found felt works well for one season but the black fades out during the season. Then it becomes rotten and tears easily. I am looking for something more durable.
100% polyester felt will last for years, dont use felt made from wool.
would it be ok to use a glass shower door instead of the plastic glazing? what would be the advantages or disadvantages? thanks mike
Yes a great video. Love the stats and details. You mentioned Scott and Gary who promote the screen collector and it appears that their results are more heat efficient. Would you agree? If so why this model over the other model?
Thanks again
Does the polyester stuff off gas the plastic at higher temps???
Hi, I'm looking at making a solar hot air box and I need your expertise advice, would using onduline bitumen corrugated sheeting be OK to use?
Good idea, the metal studs instead of wood.
2gentlehands The only problem I see is that they would conduct heat away faster than other materials. Insulation would fix that though.
He puts insulation on the top and sides, but what is the cost differential of that insulation compared to some wood 2x4's with a plywood backing?
Well done. How is that polyester felt working out for you?
@CTOL1 Thank you I have estimate that the heat exchange efficiency for this design is about 35%
@dmacosta1 You are welcome
these box's remind me of solar panels, they can generate/collect a high frequency of energy, but as soon as you draw from it it is depleted rapidly. Of course heat box's are more efficient heh.
Is this the Back to the future's scientist's brother?
a fair amount of time has gone by since you made this video. looking back are there any differences or advantages to changing any of this?
In another video he got drunk and tore this thing to shreds, bitching that, quote, "It ain't doin' nearly shit." I assume he went back to the wood stove he started with, but I don't know. He never said what came next.
which insulation will survive the extended temperature ranges yielded when using this concept?
I have seen where "styrofoam" will melt. what about pink fiberglass rigid board?
polyisocyanurate. sold around here [virginia] as a board 4'x8' covered both sides w/ a thin aluminum paper. careful. i think this stuff decays in sunlight, so paint or otherwise cover the edges of these panels. also, of course, paint the aluminum face a flat black on the "collector side".
btw, fiberglass will melt if it ever gets hot enough to melt glass
What is a steel stud "runner"? Is that "track"? and how did you get those same-sized track pieces to slide into each other. I'm missing something. Are the sides actual studs?
chad jones it's "c" channel that steel studs fit into. Basically a bottom or top plate in a steel stud wall
Where do you buy this polyester felt? is this a kind of geotextile membrane? Can I find this at Home depot or in a fabric store?
I like the idea of using the felt. I don't think there is much advantage to uing more exotic or expenisve materials. Perhaps denser material, like sheet iron (galvanized, corrugated, steel painted flat black) would retain heat better and thus pass the ehat on into the passing air better. But, it is an unimportant consideration when you see sunlight is free. Once you have built the collector, there is no further expense, so initial cost is merely a factor of comparison to grid energy costs over time.
I believe there is a distinct advantage to using the collector to heat some sort of energy sink, such as a gravel or salt bed. The entire system is thus designed around the minumum energy demand for the dwelling. For example, if the dwelling loses 150,000 BTU of heat, per day, you should design to meet that and a bit more on average, with the collector array. Some systems are capable of collecting an amazing heat volume per square foot of collector space. But, the total average winter sunlight per day limits the effeciency. So, a really good collector may be capable of 1000 BTU's per hour. if you can safely say you get about six hours of good sunlight per day ona verage, that's 6,000 per day with a 26" x 8" collector (about 16 feet sq. )
But, that's only 375 BTU per foot. To gather the necessary 150,000 BTU, you will need 400 square feet of collector, or about 25 of these felt collectors (depending on the total effeciency per unit, of course...my numbers are based on other designs. The felt design may gather more or less). A 400 sq foot collector array may not be feasible, I do not know. I estimate the cost of each unit you have built at around $125.00 per unit. This would bring a direct air unit to heat the entire average home to about $3,125.00 (US) not counting labor. I do not think this is an excessive amount of money to spend when total energy cost to heat a home in my area is about $120.00 per month. In other areas I know of, such as on the East cost of USA, a lady friend of ours who heats her home with oil is paying more than $5,000.00 per winter, or about a thousand per month (yes, it's a larger home).
Thus, from a cost point of view, I think your heater collector is outstanding. If you decide to manufacture and install these units in your area, you should do very well indeed. The only thing that might hold you back would be some sort of insurance rating, such as UL (out of the question! Far too expensive) since no insurance company will bear the responsibility on any unrated home heating system. I'd do it anyway. Folks want to save money, and I see no way your units could cause harm to any home.
Good luck with your project...outstanding ideas!
I use metal roof top for my box heater and insulated it's real good and he produces 130 to 150° heat and I use scrap wood and it works fantastic
Jim Bass Felt does not hold up to the uv light.
Insulation is good BUT polyisocyanurate foam board, that you have used,, degrades over time releaseing cyanide gas, yep! I recommend extruded styrofoam (blueboard) for your application
I want to build one with a fan. I see people building them but they seem to glossover the part where they put the fan in. it's not fully explained. Also every body wants to paint stuff black, but I had been thinking of covering with plastic sheating because the wiggle sheets will have a seam and let air in but when I went to the store to buy plastic I realized they had black plastic. wouldn't it save trouble to cover with black plastic instead of painting black? In case I sound nuts. I'm a girl. A very old girl. like 75years old and would like to get warm without spending every dime I have on Ga. Power.
Thank you Sandy
Black polyethylene plastic will melt inside a collector
Silly question but then this is only useful for heating during day time and sunshine for cold winter days.
Charl Steyn That' right.
can you demonstrate if u can change ice to boiling water
Dear Sir,
This is Alex from Guangdong Dong Fivestar Solar Energy Co,Ltd. We are professional manufacturer of Flat solar collector product in China.
It can use for hot water.
You can visit our website www.fivestarpower.com to check our product.
Pls feel free to contact me if you have any demand for it.
Alex Lai
Whatapps: 0086-15625578993
Email: international@fivestarsolar.com
no,pvc is the one that gives off fumes,when burned.
wouldn't a round solar panel work better so as to take full advantage of the sun(like mabe around a barrel?
Dear Sir,
This is Alex from Guangdong Dong Fivestar Solar Energy Co,Ltd. We are professional manufacturer of Flat solar collector product in China.
We have very well design of solar hot air collector .
You can visit our website www.fivestarpower.com to check our product.
Pls feel free to contact me if you have any demand for it.
Alex Lai
Whatapps: 0086-15625578993
Email: international@fivestarsolar.com
Materials selection can be extremely critical in these designs. Materials that absorb heat easily also give up that heat very quickly. Materials that store large amounts of heat absorb that heat very slowly and are usually dense and heavy. Materials that are light enough to be mounted on a roof usually do not store large amounts of energy (heat). Foam may be a great insulator but it's also a poor conductor.
>> Materials that absorb heat easily also give up that heat very quickly.
Such as? I think you might mean materials that can take in light and created heat that is then given off easily ... such as copper painted black?
want to save bucks on your electric bill this winter? well this solar heater can help you with that.. just like what it help me...
would soffet or corrugated steel or aluminum suffice for the heat sink in this system painted flat black?
ANYthing painted flat black will work. the trick is, you want as much black surface area as possible, in as small a box as possible. or, reversly, choose a box size. then, how do you get the maximum black surface exposed to solar radiation inside that box?
why, you may well ask, do you want a smaller box size? at least these 2 reasons: 1] cheaper to build & 2] less outside surface to re-radiate heat to the outside [your backyard, for example].
aluminum is an excellent heat conductor, so it'll offload the heat to the air quite quickly.
I'd leave the backside of the aluminum bare so as to maximize thermal conductivity with the air, and minimize the money and time spent on black paints.
Aluminum also has the advantage of texturizing as it ages, albeit this process occur much more rapidly when exposed to corroding elements. This texture increases surface area and heat distribution.
***** I am looking into a stud slotted box, polyiso insulation, downspouts with a plenum at each end to contain the heated air in and out. I was thinking of painting the insulation and downspouts black to maximize the heat gain and yet, keep the heated air away from the glazing. I have considered a siphon on the box internal to draw any heated air that is outside of the downspouts out of the box to protect the glazing from distortion. the next question has to do with capacity, velocity and volume of air on a 4'x8' collector to maximize heat transfer and delivery to the building. I plan on the air being forced into the plenum from a small blower, 200 CFM per heater, powered by a solar array/DC battery bank/ AC converter with a temperature differential collector/heated space switch. this should keep the fans off during little sun or dark conditions.
Dear Sir,
This is Alex from Guangdong Dong Fivestar Solar Energy Co,Ltd. We are professional manufacturer of Flat solar collector product in China.
We have very well design of solar hot air collector .
You can visit our website www.fivestarpower.com to check our product.
Pls feel free to contact me if you have any demand for it.
Alex Lai
Whatapps: 0086-15625578993
Email: international@fivestarsolar.com
Thermal conductivity. Most materials that conduct electricity are good thermal conductors as well. Also, light colors and shiny textures (gloss) reflect thermal radiation and dark colors and flat texture absorb it.
i would be careful with that peticular type of foam, specially if heated, you dont think it will put off formaldehyde gas? gl
I want to use this for my shed but how long during the night will the heat last?
Depends on the sun and the thermal mass etc.
So how many water barrels should be used to keep the heat for the maximum time. I have at least 8 I can use.
Actually I would be screwed with the past couple of days no sun shine.
Back system wooden fire
hi
can anyone translate this video to greek?
hello dear John Canivan
is it work at night too or no?
thanks for your nice video.
+omid ami Solar heat is stored within the thermal mass of the house.
If you can get the sun to shine at night, then yes.
I Like this better then using aluminum cans.
People seem to forget that aluminum cans can cause aluminum toxicity.
The body Likes and can use the steel element if inhaled, the aluminum cans not so much. I worked in a doctors office we treated people with aluminum toxicity... not only is aluminum in aluminum cans but also in many popular deodorants . . .
Wonderful Idea...
If you build one for me, I'll pay you for it! :-)
Dear Sir,
This is Alex from Guangdong Dong Fivestar Solar Energy Co,Ltd. We are professional manufacturer of Flat solar collector product in China.
We have very well design of solar hot air collector .
You can visit our website www.fivestarpower.com to check our product.
Pls feel free to contact me if you have any demand for it.
Alex Lai
Whatapps: 0086-15625578993
Commercial Solar Panels are expensive.
If you want to power your house cheaply
Simply Go to Google and Search for :
*Top DIY Solar Panels Research*
Choose the first result
It has the plans and explanation there.
bullschitt. Go to sunelec.com and get monocrystalline modules for under a buck a watt, and SAVE ALL THAT DAMNED TIME!
I've bought from them before, so I know they're legitimate.
Please don't waste our time.
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Great job jcanivan !!!
I recommend you join the facebook page "ONE: The New Abundant Energy Revolution"
They are trying to connect people like you together to make cheap clean energy grassroot and widespread!
thank u for nice video can a have connection with u please
Isn't this more of a hot air generator not necessarily a collector ? Come up w/ a way to store radiant heated air generated for use @ night & I'll be impressed ! just sayin
Yes this is where household air may be heated and pumped back into the house. There are many kinds of hot air collectors this is just one kind. The polyester black felt is made from recycled plastic bottles.
make a collector (somewhat large) made with bricks on a platform on the ground, use mirrors to reflect the sunlight to the collector, the bricks will Store the heat and last a while as long as the air intake to the collector is the air from inside the house, that way it recycles old air instead of the cooler air from outside temperature.
heck naw id say...4x8 or so...
Yes this is a hot air collecgtor.
to steve --
yes. it IS a hot air generator. it uses solar radiation energy to heat the air, so, in a sense, you might say it is a solar energy collector.. but the other side of the system -- the "storage" side -- might be seen as necessary for real "collection" to take place. storage usually takes place in the "heated" or "to be heated" space, typically inside the house, shop, etc.
btw, inside the house, paint EVERYthing flat black. water jugs, hoses, pipes, lumber, ...
ale bzdury
Solar power and solar heat are great things to see!