NET ZERO HOUSE Etienne Hentzen Mark Horgan Mark Lewis Grant MacGregor Darren Tannock

RECAP  Rural design option  Tasks assigned  Geometry  Materials  Lighting and Ventilation  Energy Systems  Renewable Energy  Simple bungalow design  Climate and site data for surrounding area

GANTT CHART

GEOMETRY  Optimum roof pitch 35˚  Garage added on West façade  Finalised sizing of windows etc.  Design optimised  Open plan living

LIGHTING  Design of the house on DIALux  Simulation parameters:  White walls and ceiling with 90% reflection  Windows with 10% reflection and 70% transmittance  Light coloured wood on the floor with 52% reflection  Location of the house: Glasgow  Date of the simulation: 21st March 2013

LIGHTING  Natural lighting results;

LIGHTING  Artificial lighting model

LIGHTING  Artificial lighting results

LIGHTING  House lighting installation

LIGHTING  Lighting energy consumption;  Average hours of daylight in Scotland = 12,5 hours  This is the duration of the day in mid-March

MATERIALS  Ceiling / Floor  Exterior Walls

HEATING LOAD CALCULATIONS  Degree-day method (internal gains assumed at 3.5 Celsius internal gain)  20 Celsius set-point, thus base temp Celsius for calculation.  Solar Calculation using Oban data (solar calculator available on Myplace)

HEATING LOAD CALCULATIONS MonthSouth Glazing GainNorthEastTOTAL SOLAR GAIN (kWh) Jan Feb Mar Apr May Jun Jul Aug Sept Oct Nov Dec TOTAL

HEATING LOAD CALCULATIONS

TOTAL HEATING LOAD (kWh) HEATING COOLING Annual Total Losses (kWh) Annual Solar Gains (kWh)

HEATING LOAD CALCULATIONS

ELECTRIC CAR  Fiat 500e  111-horsepower electric-drive motor  116 miles per gallon  Range of km (81-99 miles) after one full charge (4 hours at 240 volts)  Fuel consumption rate of 29kWh per 100 miles. (source : Coupe-Image jpg)

ELECTRICAL DEMAND  Assuming electric car is driven on average 50 miles per week (2600 miles per year) with a fuel consumption rate of 29kWh per 100miles;  29kWh * (2600/100) = 754 kWh/year

RENEWABLE SYSTEMS  Renewable energy sources considered:  Ground Source Heat Pump  Small Wind Energy Converter  Photovoltaic Panels

GROUND SOURCE  Ground Source Heat pumps are notoriously hard to generate data for.  Various case studies in cold climates suggest that ground source heat pumps can be used to great effect.  However, as sizing a heat pump system would involve to many uncertainties, it was decided not to continue with this energy source.

WIND POWER  The average site wind speed as specified by NOABL is 5.5m/s at 10m above ground level.  There is an abundance of wind power to be had at the site.  The situation is made better still by the fact the turbine will be placed at the brow of a shallow hill.

TURBINE SELECTION  All turbines are fairly quiet (<45Dba), and receive no noise penalty.  Values are obtained by determining the power in the wind, using the equation:  All values obtained should be considered conservative.  All turbines come with packages including inverters and grid connections.  All turbines have no cut out speed, and a similar survival speed. TurbineRated Power 5.5m/s Swept Area (m2) Output pa at 5.5m/s Proven 66kW kWh Eoltec Scirocco6kW kWh Evance R90005kW kWh

TURBINE SELECTION  Eoltec Scirocco is the best choice.  Highest power yield  Lowest noise output  Lowest weight

SOLAR POWER  European Commission Joint Research Council rates the site at around 900kW/h per m2 per year. Met Office data is similar to this figure.  Wunderground.com also gives a value obtained from NASA for the site that is in keeping with this figure, and this data shall be used in calculation of solar gains.  Solar Energy can provide useful power. JANUARYFEBRUARYMARCHAPRILMAYJUNE JULYAUGUSTSEPTEMBEROCTOBERNOVEMBERDECEMBER Total kWh/m2/Year = 1045 Average W/m2 = calculators/solar.html

PANEL SELECTION  Research was undertaken into different types of panel:  Panasonic (Sanyo) HIT system  Sharp ND-R245A6 Polycrystalline Silicon  Sharp NA-E135G5 Thinfilm Microcrystalline

PANEL SELECTION  119 W/m2 is the average irradiance for a year based on the solar calculator.  It is assumed that the PV panel will be placed at the optimum angle i.e. 35˚  It is assumed that on average the operating temperature will be around 25˚C taking into account the wind speed and air temperature. Output was determined using the equation:  The values obtained are considered conservative. PanelMax Power (W) Irradiance (W/m2) Output (kWh pa) Output (kWh pa) for 10 panels HIT N ND-R245A NA-E135G

PANEL SELECTION  Panasonic HIT N240 system is the best choice  Does not require extensive modification  Most efficient at warmer temperatures  Guarantee of 80% effectiveness after 25 years  Low Weight and thin profile  Professional fitting available

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