Hello Dave and all,
I have just finished building one of these but using red bull aluminum cans.
My panel has 25.4mm of insulation offcuts stuck together with aluminum tape.
The cans are sprayed with standard mat black car paint.
I am using standard rectangular ducting as manifolds, available from large DIY stores, I also used rectangular to circular adapters for the inlet and outlet.
I have used a standard in line extractor fan, 15 watts, I have also used a standard room thermostat to turn the fan on and off.
Single piece of 3mm glass as glazing.
As of today, my panel is currently installed at my sisters house on a south facing wall.
I have got logging temperature sensors installed at the inlet, outlet and a third one for ambient air temperature.
I will be logging data for 5 weeks and then doing a bit of analysis, watch this space.
Today was a very sunny day, I believe the temperature was being lifted about 30 deg C.
Once the fan was on, it wouldn't turn off and the temperature did not go down.
Below are some pictures:
hope these are of some help.