Monday, September 30, 2013

September 2013 Reports

29 Sept 2013: The 'last twitch' of Summer is lasting longer than expected - the weekend was sunny and warm again. There have only been short periods of heating in the last two weeks. The annual figures are looking good because a year ago, the GSHP had moved into winter mode by the end of Sept 2012, whereas the forecast now is for it to stay at moderate temperatures all week. The Carbon Zero difference between the GSHP and the PV annually is down to 54kWh, which is 6W, less than a bedside radio left on sleep.
  • House annual 5,384, biennial 5,259 kWh.  Reducing.
  • GSHP annual 3,369, biennial 3,227 kWh, triennial 3,239 kWh. Reducing. 
  • PV annual 3,128, biennial 3,089 kWh, triennial 3,175 kWh. Steady... 
  • Sunbox annual 3,324, biennial 2,920 kWh. Sunbox energy still going up. 
  • Ground Temperature 13.4ºC. The ground has never spent this length of time above 13.0º in the previous summers...

22 Sept 2013: I am now doing the number-summaries fortnightly, but as a passing note, we had a last twitch of Summer with a hot and sunny weekend. With no house heating and with bright conditions, the ground temperature is back to 13.8º, and the annual Sunbox capture risen to 3,253kWh.

17 Sept 2013: Winter has arrived, we didn't seem to have an autumn. I'm sure there will be another warm spell before the real winter arrives. Most of the annual metered figures below seem to have levelled off, and any future change depends on how different the coming autumn-winter is to the previous two years. 2011-12 was warm, 2012-13 was cool and rainy.... so the 2013-2014 season holds the casting vote.
Carbon Zero?
Strictly we are not currently carbon zero, subject to a difference of only 70kWh/triennium, equivalent to an 8watt light bulb being left on, or less than the consumption of the broadband modem... or the cordless phone...  so a small difference. If you take away hot water and consider house heating only, then we are substantially in credit, by hundreds of kilowatt hours. House heating is about 700-800kWh less than the total heat pump consumption, perhaps 2,500kWh, which is less than the PV capture of 3,173kWh.
Ground temperatures size we started in 2009.... this week's
temperature is the first stage of the winter turn-down
  • House annual 5,418, biennial 5,227 kWh. This now seems to be the stable average.
  • GSHP annual 3,422, biennial 3,210 kWh, triennial 3,243 kWh. This appears to be steady too. 
  • PV annual 3,114, biennial 3,154 kWh, triennial 3,173 kWh. Steady... 
  • Sunbox annual 3,223, biennial 2,906 kWh. Sunbox energy capture levelled off, perhaps this will be the new annual average. 
  • Ground Temperature 13.0ºC. The heating has been on for a few days, and I am relieved that it is still 13....

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