Btec level 2 Construction UNIT 3 Sustainable Construction-energy use.
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Transcript of Btec level 2 Construction UNIT 3 Sustainable Construction-energy use.
Btec level 2 Construction
UNIT 3Sustainable Construction-
energy use
Insulation, etc will not be enough
1. Improving the energy efficiency of older houses will not be enough to achieve the Government’s national carbon targets.
2. Microgeneration, as well as more efficient distribution of energy will be needed also.
Energy Sources-2 types Non-renewable energy - energy
obtained from static stores of energy that remain bound unless released by human interaction, e.g., nuclear fuels, fossil fuels - oil, coal, natural gas.
Renewable energy - energy obtained from the continuing or repetitive currents of energy occurring in the natural environment, e.g., solar, wind, tidal, biomass, geothermal.
Plans for the future Renewables
Large scale wind Microgeneration
Small scale wind Photovoltaics
Nuclear 2008 White Paper on Nuclear Power: nuclear power is low
carbon, affordable, dependable, safe and capable of increasing diversity of energy supply
Clean coal (CCS) Carbon Capture and Storage (CCS) – has the potential to
reduce emissions from fossil fuel power stations by up to 90%
Energy use in the home
Change in energy use
Low/Zero Carbon Technology
Renewable electricity Solar PV Panels- Wind turbines
Renewable heat sources Ground source
heat pumps
Air source heat pumps
More renewable heat sources Biomass Sunlight through
windows
Combined heat and power
ENERGY CONSERVATION in HOMES
What are the options to reduce use of energy?
Electricity use
Which way the house faces Solar tubes which transfer
daylight into dark areas Low energy appliances-fridges,
washing machines, lights etc Window design for cooling to
reduce need for fans/ air-conditioning
HEAT LOSS
INSULATION- for floors, roofs, walls, windows (double/triple glazing)
Draught-proofing/ heat recovery systems
Thermal mass-e.g. semi-underground houses
LZC=Low or Zero Carbon techExamples• Such technologies include: renewable
electricity generation from solar photovoltaics or small wind turbines; renewable heat from solar water heating, wood burners and other biomass boilers; and low carbon technologies such as heat pumps and combined heat and power (CHP) generators. District or community heating schemes are one way in which CHP can be used to deliver energy efficiently, and with reduced emissions if using biomass as a fuel.