1 / 22

[16469] Low Energy Building Design

[16469] Low Energy Building Design. Critique 2. Adam Boney , Fraser Cassels , Marc Breslin and Nick Burns. Our Design. 1 st Floor. Construction method: Timber Framing. Required minimal energy to process material Carbon neutral material

deon
Télécharger la présentation

[16469] Low Energy Building Design

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. [16469] Low Energy Building Design Critique 2 Adam Boney, Fraser Cassels, Marc Breslin and Nick Burns

  2. Our Design 1st Floor

  3. Construction method: Timber Framing • Required minimal energy to process material • Carbon neutral material • Allows a greater thickness for external walls therefore significantly greater U values • Can be sourced from local companies on the Shetland island

  4. Insulation : 2 possibilities U value target : 0.1 – 0.15 W/m K • Cellulose Insulation: • Sustainable and low embodied energy • 80% recycled paper • 20% less energy to manufacture than other fibres • Thermal conductivity 0.035 – 0.04 W/m K • Sheep’s Wool: • Sustainable material which can be locally provided • 14% of the energy used to manufacture glass fibre • Thermal conductivity 0.04 w / m K

  5. Draught proofing and thermal envelope • External door and garage are excluded from the thermal envelope. • Insulation installed below the concrete floor slab • Wall insulation continues down to bottom of concrete slab to prevent thermal bridging • Gaps filled with foam sealants Diagram above shows main sources of draughts.

  6. Doors and Windows • High performance door threshold seals installed which seal air gaps reducing draughts and prevent water entering the building • Door draught extruders fitted to other side also • Windows are one of the weakest points thermally in building envelope • Install high performance triple glazed windows • Low emissivity glass U value 0.6 W/m • Provide wooden window frames giving a U value of 0.16 W /mK to reduce thermal bridging

  7. Lighting • Day lighting: • Reduces the amount of artificial light need • Benefits of natural day light • Increase performance • Reducing in energy cost • The disadvantages the natural light it our design • Window size • Glare • Heat loss

  8. Lighting • Brightness • Same brightness • Less wattage (about 1/3) • Costing • More expensive • Last longer • Brightness • Same brightness • Less wattage (about 1/10) • Cool lighting • reducing energy consumption

  9. Wind Power • Shetland wind power- supply renewable energy • Turbines produced by 3 main manufacturers • Westwind Turbines • Proven Turbines • Evance Turbine

  10. Wind Power • Opting for a stand alone turbine: • Carry out comparison • Assess best supplier and turbine • Power calculation spreadsheet • P=0.5ρAV³ - www.REUK.co.uk

  11. Wind Power- Small turbine Speed Power Area

  12. Wind power- Large turbine Speed Power Area

  13. Water • Average household water use is difficult to pin down • Average annual levels of consumption (m3): Average use = 182,000L/year http://www.ccwater.org.uk/server.php?show=ConWebDoc.913

  14. Technologies 1. Rainwater harvesting: • Plenty of rain in Unst- average rainfall/year is 1,220mm1 • Systems can provide 100% of water demand, however this is rarely done 1. http://www.shetland.gov.uk/council/documents/18170-Shet-in-Statistics.pdf

  15. Technologies Rainwater harvesting: • Variability within system design and details Model agreements for sustainable water systems; CIRIA, 2004

  16. Collection • Initial thoughts on collection area focused on roof • However, collection area can be expanded to other parts of the house as well- driveways/pavements, for example

  17. Filtration • Water for different uses requires different levels of filtration • We thought it best to have one filtration system for the whole system Sediment pre-filtration Carbon or multimedia fibre UV sterilization

  18. Storage Underground Above ground

  19. Heating • Passivhaus requires consumption for electricity, heating and hot water be < 120kW/m2/year • Typically, solar thermal panel is used to provide heat for some of hot water needs- not an option for Unst • An inline water heater could be used

  20. Design calculations http://www.rainharvesting.co.uk/pages/design/dsgn4.html Roof area = Width x Length of roof = 152.29m2 Run-off coefficient = 0.75 for pitched roof Filter efficiency = 85% (A conservative estimate- example calculations typically gave efficiency as 90+%) Rainwater yield (Litres/year) = Roof area (m2) x Annual rainfall (mm) x Run-off coefficient x Filter efficiency Rainwater yield = 118,443L/year -not enough

  21. Possible solutions… • Grey water harvesting • Sea water

  22. The next steps of design • Complete the day lighting calculations and install low energy bulbs into the DiaLUXsoftware • PV cells result • Confirm the water manage design • Finalise the energy systems calculations which are incorporated within the design • Work on the MVHR system for the building. • Finalise Electrical consumption • Choose turbine & manufacturer.

More Related