Monday, March 14, 2011

Chart of Mirror effect

The top mirrors were added a couple of weeks before the black
line, and the blue curve rises slightly, but it really takes off
sharply at the black line when the bottom mirrors were added.
13 Mar '11: One thing that has always been doubted by some readers of this project is the benefit of the mirrors (the brushed aluminium reflectors that I have built around the Sunboxes).
  As it has progressed, I have been more and more convinced by them, to the extent of titling my next article about them to be about 'Solar Cooker style Sunboxes....'. They were not there at the beginning, so how have they become 'the end' ?
   This graph has provided me with some pleasing results. This is the graph of weekly meter readings for the PV roof and the Sunboxes, during the same period - from Mid March 2010 (when the sunboxes were installed) to Mid March 2011 which is now.
• Spring Equinox '10: the kilowatt hour captures were close to each other, the PV being slightly ahead.
Here is the same chart rendered in Monthly
intervals, and created at end of March '11
• Summer '10: the GSHP is asleep and has no effect in driving the Sunboxes - only the weather does that. There is still a relationship between them, with the PV always ahead.
• Autumn Equinox: '10 This was the month after installing the mirrors. I would expect the weather of October to be similar to March - but look at the difference in the curves of the two systems!
• Winter: Both systems went to zero for a while, the roof was covered with snow for a week, and the energy flowmeter on the Sunboxes also went into Error-2 mode for the Xmas week, so we had some zeroes in both curves. But in the pulling out from New year and the sunny periods of Jan and Feb 2011, the Sunboxes pulled ahead again.
• Spring Equinox '11: The rest of February was dull and grey for about 2 weeks, and now in March, the race is on! - and it is clear that the blue curve is again pulling ahead, with the most recent Sunbox week of March being higher than at any time last March or October.
• End of March '11: March was the driest month in 50 years, and there has been some good sunshine. The two technologies have been racing, but at the end of March the figures were SBs 298/ PV 264.

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