Building structure today in small residental houses · • Estetic and pratical placed • Winter...
Transcript of Building structure today in small residental houses · • Estetic and pratical placed • Winter...
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Building structure today in small residental houses
Plu
sen
erg
y h
ouse
Karin Adalberth, PhD energy consultant
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Energy-
use
(kWh/yr)
Energy
use
(kWh/(m2.yr))
Energy
production
(kWh/yr)
Energy
production
(kWh/yr)
Bought–sold
energy
(kWh/yr)
Space heat
and hot
water
3000
20
Heat from
18 m2
solar panels
1900
Bought heat
pellets
1100
Electricity
2500
15
Electricity
from
32 m2
PVs
4200
Sold el
1700
” We buy 1100 kWh pellets/yr
and sell 1700 kWh electricity ”
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Slab on ground, U value 0,07 W/(m²·K)
100 mm concrete
400 mm polystyren
macadam
Soil/clay
100+150 mm
polystyren
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External wall U value 0,07 W/(m²·K) From outside:
8 mm cladding
12 mm mineral based panel
28 mm air gap
250 mm stone wool
15 mm plywood
220 mm stone wool between wooden studs
0,2 mm PE foil
70 mm stone wool between wooden stud
12 mm gypsum wall board
inside
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Roof, U value 0,07
From outside:
metal roofing
asphalt impregnated paper
28 mm wooden panel
450 mm stone wool between light weight wooden roof trusses
0,2 mm PE foil
95 mm stone wool between wooden stud
12 mm gypsum wall board
inside
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• U value 0,8 W/(m2*K)
• 3 layers of glass
• Low emission coating
• Crypton filling
• Plastic glass distance
• Solar protection layer towards south and west
Window
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Vacuum insulation
• Thermal conductivity 0,005 W/(mK)
• Costs 7 times more
• Thin constructions
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Air tightness
Motives:
1. energy
2. moisture
3. thermal comfort
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Building frame technology
• Wooden studs + PE foil
• Concrete frame work
• Brick + cladding
• Light weigt concrete + cladding
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Good air tightness – a must!!
Target < 0,25 litre/(m2 *s) at 50 Pa
Drawings
Tutoring at site
Pressure testing early
Feedback
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Where are the weak parts?
Between
• Window and wall
• Door and wall
• Wall and intermediate floor
• Wall and foundation
• Penetrations
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0,20 m polyethylene foil – resistance of aging
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Tape, non aging
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Collars/sleeves
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inside
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Penetration
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Swedish Guinness of records
2003 Landskrona detached houses 0,098 liter/m²·s
2008 Viskafors detached houses 0,06 liter/m²·s
2009 Kinna multi-family house 0,05 liter/m²·s
2009 Värmland detached houses 0,04 liter/m²·s
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- Ventilations Is needed to get good IAQ
- Natural ventilation
- Gives good IAQ winter
- Gives poor IAQ summer
- No heat recovery
- Exhaust air
- Gives poor thermal comfort winter
Ventilation systems
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- Mechanical in- and outlet air
- yearly temp. eff. > 87%
- counter flow heat exchanger
- fans 2x35 W
- heating battery, water based
(normally electricity)
Ventilation system
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- air flow: low, Swedish std, increased
0,10 0,35 0,45 litre/(m²·s)
- regulating when leaving the house
- increasing inlet air when using
pellets stowe, kitchen fan and
central vaccum cleaner
- bye-pass automaticly (or manuel)
eg. Ti>25 och Tu<22°C
Ventilation system
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Summer • Low glass area
facing south
• Solar protection
layer g 35%
• Bye-pass
• Internal solar
protection fabric
gtot 15%
• Airing
• Indoor temp.
25-30 °C
• External blinds
very important!
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PCM
Gypsum wallboard with
wax granulate
Shifts structure with increasing
temperature, PCM
Stabilize indoor temperature
Switching temperature 23 or 26°C
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Hot water production
• Incoming cold water preheated
winter 8 °C => winter 15 °C
summer 12 °C => summer 20 °C
• Energy saving 20-25%
• Hot water usage
year 1600-1650 kWh/yr
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Energy production
South part of roof
32 m2 PVs
18 m2
solar panels
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Heating distrubution system – with air?
0,35 liter/m²·s
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0,7 liter/m²·s
Heating distrubution system – with air?
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Radiators • Under floor heating - no
• Estetic and pratical placed
• Winter dec 10: -22 °C
dec 11: -18 °C
• Radiator temp
25-28 °C
• Indoor temp 20-22 °C
• Indoor summer 25-30 °C
bye-pass, airing, solar
protection layer
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Electricity Refridgerator and freezer, 150-200 kWh/unit
(Cylinda)
Dishwasher and washing machine
supplied by hot water (Cylinda resp Elektrolux)
No stand by
LED – indoor and outdoor
1 and 7 Watt, respectively
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Use of electricity 2010 - 2012
• Household electricity 1750-1850 kWh/yr
• Ventilation 240-260 kWh/yr
• Pumps etc 600
Totalt 2650
Estimated 2500
PVs 4320 kWh
Estimated 4200
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Economy
• Soil € 65 000
• Administration € 16 000
• Designing € 30 000
• Contractor € 238 000
Solar panels and PVs € 55 000
Additional insulation € 20 000
Energy eff windows € 3 000
• Rest € 3 000
• Sum € 500 000 - € 21000
78 000
-21 000
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Thank you !