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[16469] Low Energy Building Design

[16469] Low Energy Building Design. Critique 3. Adam Boney , Fraser Cassels , Marc Breslin and Nick Burns. Our Design. 1 st Floor. Building Fabric. Thermal Envelope around building :. West Facade. Southern Facade.

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[16469] Low Energy Building Design

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  1. [16469] Low Energy Building Design Critique 3 Adam Boney, Fraser Cassels, Marc Breslin and Nick Burns

  2. Our Design 1st Floor

  3. Building Fabric Thermal Envelope around building : West Facade Southern Facade Excludes garage and front porch as these spaces will be rarely occupied so don’t require to be heated. This will also minimize draughts and help reduce thermal bridging

  4. Building Fabric Typical Wall : • Section similar to the design of our wall consists of: • Timber cladding, k – 0.18 W/m K, 14mm • Battens 40 x 40 • Isolair L sarking board, 0.047 W/m K, 22mm • Double timber stud work 288 mm with cellulose insulation, 0.035 W/m K, 280 mm • Racking board, 12mm • Service void 30 mm • Plasterboard, 0.16 W/m K, 12mm Outer Inner Calculations for U value : R = thickness/ thermal conductivity U Value = 1 / ∑ R Ro = 0.014/ 0.18 = 0.077 Ri = 0.012/ 0.16 = 0.075 R1 = 0.022/ 0.047 = 0.49 R2 = 0.280/ 0.035 = 8 R3 = (0.030 + 0.040)/ 0.025 = 2.8 Rtot = 11.442 U value = 1 / 11.442 = 0.09 W / m2 K

  5. Building fabric • Section is constructed from : • Slates, 2 W/m K, 5mm • Battens 40 x 40 • Isolair L sarking board, 0.047 W/ m K , 60 mm • Pavatherm insulation board , 0.038 W/ m K, 80 mm • Osb 12mm • 175 mm Rafters with sheep’s wool insulation , 0.038 W/m K • OSB 12 mm • Service void 30 mm • Platerboard , 0.016 W/ m K, 12mm • U Value of 0.10 W / m2K Roof Design : • Section constructed from : • Flooring finish • Fermacell 2 x 12mm • Pavatherm, 0.038 W/ m K, 50mm • Vapour barrier • 220mm Floor joists with 200mm sheep’s wool insulation 0.038 W/ m K • Vapour barrier • 200 mm air barrier • U value of 0.07 W / m2 K Similar floor:

  6. Building fabric Doors: Windows: • Frostkorken doors which are triple glazed • Door whole U value of 0.72 W / m2K • Incorporates cork frame insulation to reduce thermal bridging • High performance seals and extruders fitted to prevent draughts • Ecopassiv windows are triple glazed • Whole window U value – 0.75 W / m2K • Warm edge spacers • Polyurethane frame insulation • Argon fill 44mm

  7. Demand - Heating Fabric heat loss = Area x U-value x Temperature Difference = 8751 kWh/yr Ventilation heat loss = mass flow rate x Cp x Temperature Difference =3759.5 kWh/yr

  8. Demand - Heating Gains: Passive: = 5840 kWh/yr Total Gains = 8761.25 Solar : = 2921.25 kWh/yr Difference = Gains – Loss = -366.06kWh/yr

  9. Demands – Hot water • Outside Air Temperature 10 ̊C • Temperature of hot water 45 ̊C Hot water demand = 163 litres/day Assume usage = 5 hours m = 0.009 kg/s Cp = 4187 Q = m * Cp * ∆t * ŋ ∆t = 35 °C Q =3229.146 kWh/yr ŋ = 0.75

  10. Demand – Weekday Energy

  11. Demand – Weekend Energy

  12. Demand – Appliances

  13. Total Energy Demand Total Energy Needed = Appliances + Hot water + Heating = 4646.7983 + 3229.146 + 366.06 = 8242.004 kWh/yr required

  14. Power calculation formula: Worked example- P=ρAV³xCp http://www.raeng.org.uk

  15. Turbine options:

  16. Total demand data: • Total demand= Appliance demand + hot water demand +Heating demand = 8242.004 kWh/yr

  17. Turbine selection: • Having calculated the potential total annual demand for building we can select a suitable size of turbine to meet this demand. • We have opted for : - 10kW Westwind Turbine. - Producing ~12500kwh/yr. - 6.2m diameter blade. (taken from http://www.westwindturbines.co.uk)

  18. Turbine selection: • The selected turbine satisfies the annual demand however there is the possibility that it may not meet a particular monthly demand. • We have opted for a turbine with a higher output than required. • Should this occur we will look to recover the power loss via a - PV system. - Power storage system.

  19. Power storage from turbine: • There is a potential to store power generated from the chosen turbine. • Variety of ways to store power- 1. Battery storage 2. Compressed air storage 3. Hydrogen Storage These three types will be investigated and the most suitable selected.

  20. Water – from last time Rainwater harvesting systems Above ground storage tank

  21. Water • Using correct numbers for water usage from Code for Sustainable Homes, taking: Water required = 60L/day/person = 109,500 L/year Water yield = 152.29m2 x 1,220mm x 0.75 x 85% = 118,444 L/year • So rainwater should yield enough to meet water demands

  22. Water – grey water recycling Waste water from bathtub, shower and wash-basin will be filtered and put back into use This will require a secondary filtering process for grey water

  23. Water – black water disposal • Sewage will be disposed of using a reed bed system • Water passing through the reed bed is cleaned by micro-organisms

  24. Whatsnexts • MVHR completion • Storage systems • Savings • Cost

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