1. [16469] Low Energy Building Design
critique 1
Adam Boney, Fraser Cassels, Marc Breslin and Nick Burns

2. Location

3. Case studies Considered a number of similar projects
Focused on layout, technologies and locations
Found there is no set, prescribed approach

4. Case studies Kingspan Lighthouse, Watford
Zero carbon house – ‘Light on the world’s resources’
40° mono-pitch roof accommodating solar PV panels
Passive ventilation and cooling with wind catcher
Grey water recycling
Low energy LED lighting

5. Case studies Passivhaus project, Galway
Timber frame construction, 235m2
Balanced ventilation system with heat recovery
Large amounts of rock wool insulation
Water-saving WCs

6. Case studies Batavia, Unst Zero carbon, detached house
Timber frame construction
2 micro wind turbines
Air-to-water heat pump
Strong links with local, national and international organisations

7. Climate Consistent levels of strong wind all year round
Variable sunshine levels – low amount in winter, higher in the summer
Source:

8. Energy usage
Average four bedroom house consumes approx. 29,000kWh of gas and 6,000kWh of electricity Energy use: Heating: 61% Hot water: 23% Lighting/electrical: 13% Cooking: 3%

9. Technology Wind technologies: Cost: £ 500-£1,200
Size: Range from a few watts to a few hundred watts.
Output: 700kWh-2,500kWh depending upon wind speed.
Payback period: 4-5years.
Small micro wind turbine

10. Technology
Cost: £4,000 -£10,000
Size: Few hundred watts to a few hundred kilowatts.
Output: 50,000kWh-800,000kWh depending on wind speed.
Payback period: 5-6years.
Stand-alone wind turbine

11. Technology Average site wind speed in m/s
From our climate investigation it is apparent that the average wind speed for the location is in the region of 7 m/s.
Average site wind speed in m/s
Yearly output in kWh for turbines rated at: 4 5 6 7 8
600W
794
1354
1948
2504
2969
2.5kW
2473
4282
6333
8404
10251
6kW
6765
11622
16900
21944
26216
15kW
16912
29045
42250
54860
65541
80kW
51980
122560
175200
210240
245280
250kW
141229
383000
547500
657000
766500
Our site will install a 2.5kW wind turbine to satisfy the electrical needs of the building

12. Technology From electricity generated via wind power:
Ground-source heat pump
HVAC
Direct heating system

13. Additional Technology
PV cells
Rainwater harvesting
Clean source
Effective in summer
Low maintenance
Generation 180KWh per square metre
Collected water can be used for:
Drainage
Washing (post antibacterial treatment)
Drinking (post mineralization)

14. Possible Technologies
Sprung floor

15. Possible layouts Based on initial thoughts and findings… Materials
Orientation
Size

16. Possible layouts