I hooked up the heater using a 3" water heater flex tube. The flex was the only way to go because of the pivot motion of the heater.
You can also see the placement where I get the temp readings
The other end of the flex goes through the window of the shop. I made a block out for the window and sealed it off to keep the drafts out.
The out flow really needs to be higher, but I did not want to start cutting holes in my new shop until I did some testing first.
It was early in the morning and the ambient temp was around 40 when this picture was taken. The output air was already at 150 degrees.
The high readings for the day were,
Ambient = 55 degrees
Air Output = 180 degrees
Right now I am loosing 20 degrees by the time it leaves the box and gets into the shop. The metal tubing is cooling the air back down a little. I will insulate the tubing to try and hold on to the heat a little longer during its travel into the shop.
Another step I plan to do is to attach an additional tube and bring the inflow from the shop instead of the outside. This way the air that is circulated will be from the inside and when the shop starts heating up it will be more efficient by circulating that same air.
Doing that I will have to build a filtered return air box inside and on the floor of the shop and put the outflow pipe at a higher level. The fan will also be placed inside the filtered return air box to increase the efficiency of the fan.
If I am going to go that far I might as well put the heater on a thermostat and go ahead and hook up a battery bank to it as well. That means I will need to increase the solar panel to a higher wattage to charge the batteries.
The one main problem to all this that the square foot of the heater will not heat the shop quickly or keep it at a constant temperature. The cubic foot of the shop is too massive for such a small heater. This design was made as an experiment to see if it would work. This heater would heat a well insulated room of about a 10'X8' with 8' ceilings. I originally designed this to heat the bathhouse.
This means to achieve the desired temperature in the shop at a reasonable rate, I will need to build one 2 1/3 larger than this one. That is a 230 can system. Or I could just build another one like this one and attach them together. I guess I need to call my buddy and have him start collecting cans for me.
Total out of pocket using junk on hand = $70.00
If I bought everything new = $200.00
I have seen some of these made using just 1/2 insulation sheets and sealed with duct tape and they work, but I wanted to build a heater that would last. The biggest cost if you have all the building material is the high temp paint and caulking.
That's all I got for now.