While on vacation in the Netherlands, temperatures rose to 40°C (=104°F) wich was a bit unpleasant. Sweating over my book, I thought about how to fix that when I get back home.
As my room at home gets hit by direct sunlight from 1pm till sunset, I hope to use that to power whatever I come up with. Buying a solar panel is okay, I am open to building one from individual cells though.
The IdeaMy current plan is to have a (wooden) box with two channels. One containing a CPU cooler to keep the hot side of the TEC cool, one with the cold side wich will probably also need a heatsink.
ThoughtsI probably have to integrate a tray to catch condensate on the cold side. On the intake of the cold side, I want a fan filter, on both I want fan grills. Both outputs (cold and hot) will get dryer hose flanges to direct air where I want it.
The TEC I have eyed out has a △Tmax of >65°C, so 30°C (= 86°F) on the hot side, the cold side will be -35°C (= -31°F). I am pretty sure heatpipes in CPU coolers do not work that far down. One of those single piece aluminium coolers should do though.
Hot side is of little concern.
The solar cell part…
I could either spend 100€ on a ready made 12V 80W panel (wich is then a big clunky chunk of material), or get cells and make my own foldable module.
I got some knowledge from building model race cars, so let me explain some things:
Each (silicon) based cell makes 0.61V with varying current. To get 12V, I need 20 cells in series.
Another important piece of info: The cell with the least current, limits the whole series. So a row of 10 cells delivers jack all if one goes down (or is in the shadow).
I picked out a 63x19.5mm cell (2.20€ per piece).
For ease of notation: 1x2 means two cells in series, 2x1 means two cells in paralel.
|Cell configuration||Voltage (V)||Current (A)||Power (W)|
The last two configurations are near 100€ giving me one fifth the power I need/want. So buying a ready made module is the cheaper option.
- 40x40mm TEC module ([email protected] = Qmax >50W)
- Arctic Alpine 12 style cooler (cold side)
- Arctic Freezer 7 I have somewhere. Does not have a fan anymore though.
- Two Random fans (got plenty of those)
- Dryer Hose connectors
- A switch
- Some 12V delivering solar thing
I could spend 120€ on an experiment, 85€ of wich would go into a solar panel, or I could use the 300VA transformer I got sitting under my desk for something useful.
How about a badass [email protected] AC/DC PSU and something for it to power?
This is more of an excersize and venture into TEC than anything else. So this can be “inefficent” (wich does not matter since running cost is 0).
Worst case I have a TEC and solar panel on hand for later use.