[16469] low energy building design
DESCRIPTION
[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. - PowerPoint PPT PresentationTRANSCRIPT
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[16469] Low Energy Building Design
Critique 3
Adam Boney, Fraser Cassels, Marc Breslin and Nick Burns
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Our Design
1st Floor
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Building Fabric
West Facade Southern Facade
Thermal Envelope around building :
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
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Building Fabric
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 conductivityU Value = 1 / ∑ R
Ro = 0.014/ 0.18 = 0.077 Ri = 0.012/ 0.16 = 0.075R1 = 0.022/ 0.047 = 0.49 R2 = 0.280/ 0.035 = 8R3 = (0.030 + 0.040)/ 0.025 = 2.8
Rtot = 11.442 U value = 1 / 11.442 = 0.09 W / m2 K
Typical Wall :
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Building fabricRoof Design :
Similar floor:
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 / m2 KSection 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
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Building fabricWindows:
•Ecopassiv windows are triple glazed
• Whole window U value – 0.75 W /
m2 K
•Warm edge spacers
•Polyurethane frame insulation
•Argon fill 44mm
Doors:
•Frostkorken doors which are triple
glazed
•Door whole U value of 0.72 W / m2 K
• Incorporates cork frame insulation to
reduce thermal bridging
•High performance seals and extruders
fitted to prevent draughts
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Demand - HeatingFabric 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
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Demand - HeatingGains:
Passive: = 5840 kWh/yr Total Gains = 8761.25
Solar : = 2921.25 kWh/yr
Difference = Gains – Loss
= -366.06kWh/yr
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Demands – Hot water Outside Air Temperature 10 JCTemperature of hot water 45 JC
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
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Demand – Weekday Energy
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Demand – Weekend Energy
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Demand – Appliances
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Total Energy DemandTotal Energy Needed = Appliances + Hot water + Heating
= 4646.7983 + 3229.146 + 366.06
= 8242.004 kWh/yr required
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Power calculation formula:Worked example-
P=ρAV³xCp
http://www.raeng.org.uk
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Turbine options:
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Total demand data:Total demand=
Appliance demand + hot water demand +Heating demand
= 8242.004 kWh/yr
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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)
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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.
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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.
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Water – from last time
Above ground storage tank
Rainwater harvesting systems
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WaterUsing 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
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Water – grey water recyclingWaste 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
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Water – black water disposalSewage will be disposed of using a reed bed
system
Water passing through the reed bed is cleaned by micro-organisms
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Whats nextsMVHR completionStorage systemsSavingsCost