Introduction: Almost Free Solar Hot Air Collector
I hate throwing anything out untill I have exhausted my mind, searched the web or visited Instructables for other potential uses. I have not found and hot air collectors made from light fixtures so here you go.
Electric Car Conversion;
www.ecosteve.ca
YouTube Solar Hot Air Collectors;
http://www.youtube.com/user/EcoGreenGroup
Making a solar hot air collector out of free used 2 x 4 metal light fixtures, free old glass and free black paint to reduce our carbon body tape outline, reduce our untility bills and save money.
We are building and installing 14 of these hot air collectors on our south wall of our 140 year old house in Ontario, Canada. During sunny days in the winter these will completely heat our house for about 6 hours. After we make these, we will join them together venting the cold air from the bottom of the rooms and exhaust the top vents to the top of rooms. The fans will help increase the air flow to these rooms. The next collectors that we make will also be insulated and have a metal baffle inside to help concentrate the heat. The collectors then will be connected to the house and flexable dryer
duct inside the house will vent heat to various rooms . Check out our You tube home page for more info.
• Free Heat.
• No Fuel Needed.
• Renewable.
• Cost effective.
• Green.
• Recycled.
Step 1: Dumpster Diving Time
Step 2: Prepare the Fixture Frame
Step 3: Painting the Frames
Step 4: Cutting the Vent Holes
Step 5: Intalling the Glass
Step 6: Solar Panel and Micro Fan (Optional)
(Optional)
Step 7: The Next Step
The Next Step
• Make more hot air collectors and mount them on the house to offset the heating bills. Possibly insulate the collector to reduce loss of heat through the side and back.
• Reduce the fossil fuels we use.
87 Comments
4 years ago
This is good idea to recondition any batteries. Thank you Gregory ! :)
5 years ago
A few years back I came across a large piece of black tarp like material. One side is mildly glossy the other side is mostly flat black. I Put your standard Plastic window insulation over my south facing window and against that I put a piece of the tarp with the less glossy side facing outward. Even on mostly cloudy days I can feel the heat coming off of this piece of tarp. And that is just passive sun collection and radiant style heat coming off it to warm up one room. Best part of having it inside the house is that you get no heat loss from being exposed to the wind or possible extreme colds outside.
I am planning to build a frame out of 2x4 that I have laying around and attaching 2 12volt computer fans hooked up to a solar panel I have. I will also be spray painting the sun facing side of the tarp with flat black paint to give it maximum UV absorption. But I expect the next design to be twice if not three times more efficient. If it does work I plan to build one for all of my south facing windows, and maybe even devise a way to put a couple on the west side of my home on the roof with insulated duct work to help heat my kitchen and basement.
5 years ago on Introduction
?. Does the thermal windows in a house block some of the heat rays? I did an experiment with 2 pieces of aluminum painted flat black, put one outside in the sun and the other inside of a slider full sun through the glass, The outside one got almost to hot to touch, the inside one barely got warm.
thanks Bill
Reply 5 years ago
I don't know why you are having a problem with your indoor panel.
A few years back I came across a large piece of black tarp like material. One side is mildly glossy the other side is mostly flat black. I Put your standard Plastic window insulation over my south facing window and against that I put a piece of the tarp with the less glossy side facing outward. Even on mostly cloudy days I can feel the heat coming off of this piece of tarp. And that is just passive sun collection and radiant style heat coming off it to warm up one room.
Do you have a problem with airflow through your window, or anything obstructing the window that would cause it not to absorb all possible sunlight?
5 years ago on Introduction
?. Does the thermal windows in a house block some of the heat rays? I did an experiment with 2 pieces of aluminum painted flat black, put one outside in the sun and the other inside of a slider full sun through the glass, The outside one got almost to hot to touch, the inside one barely got warm.
thanks Bill
5 years ago on Introduction
6 years ago on Introduction
Hey man, nice solar air heater. I made one using a different approach. Here is mine if u are interested: https://diybarrelstoveoutdoorfurnace.wordpress.com...
6 years ago on Introduction
Ok everybody is up in arms about the fan. I myself made a very cheap passive solar heater using a piece of card board painted flat black over the inside of my south facing window by leaving a 1 inch space at the bottom and a 2 inch space at the top. staples some plastic over the top opening to prevent the air from going backwards at night when it got cold but was able to push the hot air through the top around the bottom of the plastic when the air heated up during the day. Even though it was passive, (no fan what so ever) it did make a large improvement on how warn our living room stayed during the day an reduced the amount of wood that I had to burn. With this method in this instruct able, I would suggest something on the inside over the bottom hole that would work as a check valve to keep the cool air from coming in to the house through the bottom when the air outside cools and cools the air in the collector or even some type of one way check valve at the top, however with the duct on this bringing it into the house I would suggest on the bottom on the inside of the solar collector. It must be light enough where the air can move it out for it to draw but heavy enough not to allow the cool air to pass back through the hole going backwards. even with the fan there needs to be some kind of check valve to keep the cold air from coming in since you will not be using the fan on it when there is no heat in the collector. With the fan it could be a heavier type of material. Just an idea for you to expand on. Other than that I thought it was a vary good Idea an true using the fan it would be better to have it at the bottom to make the fan last longer, but I myself like the passive much better, imo. Keep up the great work. and don't let anyone knock you down with their comments it is all trial and error on the most part.
7 years ago on Step 7
You could possibly use a peltier element for powering the fan.
7 years ago
I really like this and will implement it to offset my heating bill during winter ! Brilliant idea !!!
Reply 7 years ago on Introduction
The overall concept is great. I am using a 3" - 12 volt bilge fan and a 12 volt thermostat that is set for hi low temps. All of my power is from 2-10 watt solar panels and small gel battery. My solar controller/charger is from Harbor Freight. My heat tubes are 2 ft. pieces of aluminum duct and elbows. My glass is a used 32 x 60 inch aluminum window. If you mount the fan on the return air side, you do not have to worry about the high temps. If you have an existing central air unit you can hook this straight to the plenum and your inside thermostat will react to the supplemental hot air you are pumping into the house. These are not free, but cheap enough! I am about finished with this one. I will post pics and instructions as soon as I finish my installation.
7 years ago on Step 6
One mod I could suggest to this is a liquid circulator. Just attach some 1/4" or so copper tubing and paint it black too. That way you get the double benefit. Just pump the liquid into the house and to a radiator and a fan and presto-heato!
7 years ago on Step 7
Excellent advice on being an Eco recycler. Another place to ask is where you see a commercial building tenant improvement in progress. They often gut the interior including 10 year old obsolete lighting for the panel boxes and acoustic ceiling tiles that could be used inside the boxes for insulation.
Reply 7 years ago on Step 7
Thank you for your comments, When you think about it even poop is not waste, methane gas (cooking heating), fertilizer and even a source of solid fuel, Even in some places in the world they polish the floors with it. One mans trash can also change the world for the good.By the way here is an updated you tube video about solar hot air collector that I made. Enjoy
http://www.youtube.com/watch?v=NZwdhjTWU0c
Eco Steve
7 years ago on Introduction
I've heard that putting foil behind radiators reflects heat back into the house (rather than heating the walls). Has anyone considered lining the box with tin foil rather than using black paint?
Reply 7 years ago on Introduction
Thank you for the comment, although in this instructable I did not line the box with foil instead just painted black. But in this follow up You Tube video tutorial I did seal, install foil backed foam board and paint the surface flat black to absorb the sun. Enjoy
http://www.youtube.com/watch?v=NZwdhjTWU0c
Eco Steve
8 years ago on Introduction
i have seen these but this is easier than the others
10 years ago on Step 7
wOw impressive its shirley got me thinking.
would like to see photos of the finished installation ? could boxes like these be constructed out of wood or is there an inherent advantage to metal ?
Reply 8 years ago on Introduction
I WOULD LOVE TO SEE PHOTOS AS WELL? PLEASE!
Reply 10 years ago on Step 7
https://www.instructables.com/id/Solar-Heater/
From some of the discussion on that 'ible, it sounds as if *not* using metal may have some advantages.
So even though metal construction might be slighly less efficient, the fact that ecosteve got these fixtures for free and is keeping them out of the landfill probably equals everything out in the end.