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Author Topic: 1 year on from warm-roof and a few triple glazed windows.  (Read 4337 times)
Ivan
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« on: June 16, 2011, 05:22:13 PM »

Still plenty I could do, but I now have 1year data on my energy consumption since modifications last year. These modifications have not only saved us fuel, but given us a warmer house - much warmer first thing in the morning for example.

Annual heat consumption: TOTAL=12300kWh  ie 8400kWh gas (cooking/heating) + approx. 2500kWh wood (wood burner) + 1400kWh veg oil (150litres in modified rayburn)
NOTE: Wood fuel is probably only achieving 65% burn efficiency in my water-jacketed hunter herald, so this year, I'll be fitting the ultra efficient Burley woodstove for improved wood efficiency.

Electricity consumption: TOTAL PURCHASED=1375kWh (This is a little disappointing as we've generated far more than we've used, but exported about 60% of the Solar PV elec).

This year, we've fitted 6" of underfloor insulation under the kitchen and dining room, so we should see further reductions in a year's time.
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MR GUS
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« Reply #1 on: June 16, 2011, 05:27:29 PM »

yOU PUT ME TO SHAME SIR!

Congratulations, nice low elec-trickery useage.
Now if only they'd do a "green lottery, for renewable make overs, i'd go for that!
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StBarnabas
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« Reply #2 on: June 16, 2011, 05:31:33 PM »

Ivan
you have done well!  My energy consumption has  remained fairlty static over the past few years, despite better insulation, high grade double glazing etc. The problem has been space heating and two very cold winters. It will be interesting to see how next year compares. I am hoping the insulation 100mm underfloor in the chancel and new Burley wood stove will help considerably.

Sean
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wookey
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« Reply #3 on: June 16, 2011, 05:59:27 PM »

Ivan - what were the previous year's figures to compare against? i.e what sort of reduction have those changes achieved?
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Wookey
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« Reply #4 on: June 16, 2011, 06:49:31 PM »

Ivan what is the floor area (m2) of the property?

Thanks,
Ron
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Ivan
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« Reply #5 on: June 17, 2011, 02:51:26 AM »

Wookey,

Heat consumption: It's difficult to give an exact figure, as I didn't keep track of how much wood I burnt during the previous year. It was around 18 000kWh of gas plus somewhere between 2 and 4 tons of wood. The biggest effect is down to replacing crappy 75mm of polystyrene between rafters of loft conversion with warm roof (100mm PU between rafters and 50-60mm PU above rafters). I also persuaded by neighbour to let me put 100mm thickness of the redundant polystyrene on their side of the party wall, so I'm not losing so much heat to their unheated attic. I took a lot of trouble to seal everything to prevent air convection within the insulation layer, and fully-insulated the tops of all the supporting walls, to stop heat-bridging to exterior. (I think I posted thermal images somewhere else to demonstrate how effective this was).

Electricity consumption: Pretty static at around 6kWh/day, although I'd put an extra 2kW of PV on the roof since the previous year, so more of the requirement met 'in house', hence slightly lower electricity bill.

Ron, Floor area is approximately 200m2 (total area of 2floors plus attic conversion)
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