Graham Chiu

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since Jan 01, 2018
Wellington, New Zealand
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Recent posts by Graham Chiu

I don't know about a through the wall solar oven but some apartments I've stayed in north west China have a fridge that is just a cupboard door to a platform that is on the outside of the building for use in winter.  It's covered to stop the snow falling onto it.
2 months ago
So, one month later they finally came to adjust the panels.  Rather than separating them, they dropped all three ( not just the first two ) rows to 20 deg as it was much less work than moving them of course.  And why drop all three?  So, it would look better!

But now one inverter is reading solar generation is negative!!  WTF?
2 months ago
How many thousands of Volts does your electrostatic precipitator need?  And how do you generate that?
2 months ago


Perhaps you could use this?
2 months ago
What foods are you using this to cook?  Cooking times?
2 months ago
But then you lose all the pre-heating of the oven as you're getting the fire up to steam.
3 months ago
Grabbing heat from the chimney with an older style fireplace could be problematic as you are cooling an exhaust stream that contains flammable pollutants that could settle and coat the chimney.

How about first increasing the fire efficiency with a rocket retrofit? I've seen things that purport to do this.
3 months ago
No.  I learned that catalytic converters combust things at lower temperatures. But an unwanted side effect is the generation of dioxins and furans etc. because of the temperature range they are used in.
3 months ago
I'm now wondering if that's one of the causes of my high electricity use if the hot water in the cylinder is thermosiphoning back to the panels at night.

I guess I could measure the night time temperature and see if the sensor is the same or lower.  If the sensor at the collector reads higher than ambient it must be thermosiphoning back upwards.
3 months ago
I've found the plumber who was originally contracted to install the system so he's coming to have a look later this week.
I could go onto the roof again to examine the bottom of the tubes but will wait until spouse is home to hold the ladder for me !
3 months ago