Transcript Lebd PROJECT

NET ZERO HOUSE
Etienne Hentzen
Mark Horgan
Mark Lewis
Grant MacGregor
Darren Tannock
RECAP
Ventilation system
Energy management
Rainwater harvesting
Solar thermal
collectors
Under floor heating
GANTT CHART
GROUND SOURCE HEAT PUMP
 The overall hot water and space heating requirement of the dwelling is
8,500 kWh P.A.
 With the use of Solar thermal collectors this is reduced to 2579 kWh
P.A.
 A ground source heat pump shall be used to cover the rest of the
heating requirement
 WW3500 by Calorex provides a CoP of 3.64 when taking water from
10 degrees to 55 degrees.
 A conservative CoP value of 3 was taken in calculation.
 The heat pump can supply 2579kWh water heating for 859kWh of
electrical energy P.A.
OVERALL ENERGY PROFILE
Energy (kWh/day)
January February March
April
May
June
July
August September October
November December
Heating Demand
Solar Thermal Energy
Gain
32.36
21.86
9.1
0
0
0
0
0
0
3.03
20.52
32.4
4.63
8.8
9.1
0
0
0
0
0
0
3.03
5.62
3.26
Heat Pump Demand
Electrical Appliance
Demand
Total Electrical
Demand
9.24
4.35
0
0
0
0
0
0
0
0
4.96
9.71
7.6
7.6
7.6
7.6
7.6
7.6
7.6
7.6
7.6
7.6
7.6
7.6
16.84
11.95
7.6
7.6
7.6
7.6
7.6
7.6
7.6
7.6
12.56
17.31
Solar Energy Gain
1.35
2.5
3.56
4.81
5.67
5.46
5.17
4.93
4.08
2.7
1.63
0.95
Wind Energy Gain
34.50
34.5
45.92
34.50
34.50
25.15
34.50
34.50
34.50
34.50
34.50
25.15
Total Energy Gain
35.85
37.06
49.49
39.31
40.18
30.61
39.68
39.44
38.59
37.23
36.14
26.10
Excess Energy Gain
19.01
25.11
41.88
31.71
32.57
23.01
32.07
31.83
30.98
29.62
23.57
8.78
•The energy demand is shown in sequence per month.
•At no time does demand exceed gain.
OVERALL ENERGY PROFILE
OVERALL ENERGY PROFILE
 The house can sustain a 3-7 days storage using a Raylite M-Solar 2V
1380Ah battery.
 This allows for building autonomy on days where there is no wind or
sun.
Storage Raylite MSolar 2V 1380Ah
Total Electrical Load
January February March
April
May
June
July
August
September October
November December
16.84
11.95
7.60
7.60
7.60
7.60
7.60
7.60
7.60
7.60
12.56
17.31
Days of Storage
Required
2
2
2
2
2
2
2
2
2
2
2
2
Battery capacity
(kWh)
66.24
66.24
66.24
66.24
66.24
66.24
66.24
66.24
66.24
66.24
66.24
66.24
53
53
53
53
53
53
53
53
53
53
53
53
No. Of Batteries
Required
0.63
0.45
0.28
0.28
0.28
0.28
0.28
0.28
0.28
0.28
0.47
0.65
No. Of Days Storage
Achieved
3.14
4.43
6.96
6.96
6.96
6.96
6.96
6.96
6.96
6.96
4.21
3.06
Battery capacity at
80% DOD (kWh)
OVERALL ENERGY PROFILE
Demand
Generated
Excess
Energy kWh/PA
3635.238035
13679.30667
10044.06863
 Taking into account all heat and power generation
technologies the demand of the house is 3635kWh/year.
 This is equivalent to 20 kWh/m2 floor area per year.
EXCESS ENERGY
 In this house we generate much more energy than we need.
 Using the Feed In Tariff we can acquire wealth through
generation and exporting energy.
 It is possible to calculate the pay back time of the
renewable energy generation technologies given these
average figures.
ENERGY SYSTEMS PAY BACK TIME
 The cost of all energy systems technologies within the house was totalled up
and weighed against their savings.
 The pay back time for the energy systems within the building is 16.22 years
 After the technologies have paid for themselves they will generate £4000
income for the family through the Feed In Tariff and energy savings.
Money Spent £
Energy Systems
65750
Money Saved £/PA
Materials
272.45
Electricity
402.43
Heating
124.67
Energy Systems
3252.02
Total
4051.58
Buy back time (Years)
16.22
BUILDING RATING
 BREEAM Ecohomes 2006 (replaced by CfSH in England/ Wales, still used
in Scotland)
 Pre-Assessment Tool used
 Energy values obtained from SAP worksheet, 2005
BREEAM ASSESSMENT
 BREEAM Element Library
INSULATION
A
CLADDING
A+
PLASTERBOARD
A+
WALL INSULATION PROFILE
 U-Value = 0.13 W/m2K
 Thermal lag time = 10-12 hours
 Advantages:
• Positive Carbon Value- straw bale
absorbs carbon in growing process
• Thermal properties of a heavyweight
structure (heat flux time delay)
• Low sound transmission (thickness of
straw bale acts as excellent sound
dampener
• Airtight and vapourtight as per
PassivHaus standards
BREEAM ASSESSMENT
ROOF
A+
FLOORING
A+
GLAZING FRAME
A+
HEAT LOSS
Heat Loss Parameter =
(Fabric loss+ Ventilation loss)/ Floor area
=( 115.43 W/K) / 180m2
= 0.64 W/m2K
0.64 < 1.1 HLP for maximum Ecohome Score
Section
Energy
Transport
Pollution
Materials
Water
Land Use/ Ecology
Health/ Wellbeing
Management
Point
Dwelling Emission Rate
Heat Loss Parameter
Drying space
Eco-labelled WG
Low-eng lights
Security lights
Cycle Storage
Home office
Insulation ODP/GWP
NOx emissions
Red. Surf. Runoff
Renewable E. Use
Flood risk
Roof
External Walls
Internal walls
floors
windows
External surfacing
boundary protection
Sourcing- structure
Sourcing- finish
Recyling- int+ ext
Potable water use
External collection
Eco value site
Ecological Enhancement
Ecological Protection
Species Change
Building Footprint
Daylighting
Sound Insulation
Private space
Home User Guide
Considerate Constructors
Site Impacts
Security
TOTAL
%
Total %
12.83
1.83
0.92
1.83
1.83
1.83
2
1
0.91
2.73
1.82
2.72
1.82
1.36
1.35
1.36
1.36
0.9
0.45
0.45
2.71
1.35
2.71
8.33
1.67
0
1.33
1.33
2.67
0
5.25
7
1.75
3
2
3
2
Possible %
Achieved %/section
21.07
22
95.8
3
8
37.5
10
10
100.0
14
14
100.0
10
10
100.0
5.33
12
44.4
14
14
100.0
10
10
100.0
87.4
100
ECOHOMES SCOTLAND 2006
RESULTS
ASSUMPTIONS
 Zero-carbon emissions
 Drying space provided indoors
 All appliances (fridges, washing machines, etc.) A+ energy rating
 Efficient external security lighting with day-light/ motion sensing
 Cycle storage provided (garage)
 Surface runoff collected or attached to municipal drainage system
 Low-risk flood zone (95m elevation on hill)
 Finishing materials- locally sourced timbers
 Internal and external recycling bins provided
 High sound insulation value of straw bale
 Energy Efficiency User Guide supplied with home
 Construction contractor must work to Considerate Constructors Standard
 Security to PAS24-1 Standard and achieved Secured by Design (SbD) award
DRAWBACKS / IMPROVEMENTS
 Rural location- poor transport links. Ecohomes does not
give consideration to use of electric vehicles
 Rural location on existing field- slight damage to local
ecology
 Consultation must be undertaken with an accredited
ecological expert to ensure minimising of ecological damage
 Consideration can also be given to techniques to enhance
local ecological value
 Building footprint ratio 1:1 (single floor)
THANK YOU FOR LISTENING
 ANY QUESTIONS?