I live in a warm flat now and it would be impossible to keep highlanders here without any cooling unit. I keep them in the basement of my parents house, but the sundews did not grow well either. And since sundews are my favourites I built a small box with peltier cooling unit to have them with me. In principal, its just something like camping fridge with peltier module, but since i built it myself, the box was cheaper than the fridges i found on the internet. And of course, it was built for plant growing, so its proportions are adequate. And i must thank to all, who have built similar projects and posted them here as an ispiration
Cooling module: approx. 30 W and the LED lights 12 W, all running at 12 V.
Day: 22°C, thermostat on
Night: 13 - 15°C, thermostat off and the cooling module runs with short pauses (timer) all night
Space for plants: 24x24x17 cm (i believe, that peltier and led lights are good for such small application, but not for larger terrariums)
I thought, this might help someone with building such thing, so I am posting a few photos and can write any experience I have.
Overwiev (the styrofoam box i got in our lab)
The cooling unit (Peltier module with two aluminium radiators and two fans)
Lights (12 CREE cool white chips and 6 CREE warm white plus 4 cheap warm white leds, which will be replaced soon by Osram leds with better spectrum)
As you can see, it works. The plants look much better than before, most of them are growing in the box for about 3 months so far.
Edited by Zlatokrt, 03 November 2011 - 19:00 PM.