chapter7 - Energy building performance Flashcards
List three ways in which we can save money and help the environment in the home
1, switching off- turning off appliance rather than leaving them off can save £80 on electric bill
2- draft excluders - in most homes you will lose heat through doors and windows, draft excluding your home can save £35 a year on energy bill
3- kitchen care- only boil kettle when needed, use a wash bowl rather than use a tap, cut back on washing loads can save £50 a year
List 3 more ways in which we can save money and help the environment in the home
1-shower head, fitting a water efficient shower head can save £67 a year on heating
2- time in the shower, spend one minute less in the shower will save £10 on your energy bill per year per person
3- controlling the thermostate- having the temperature set at 1 degree lower can save £90 a year
list another 3 ways to help save money in homes and help the environment
1- turning of lights when there not needed
2- generate renewable energy through heat pumps solar thermal heating etc
3- switching lights- switching from filament bulbs to efficiency bulbs can save alot of money
describe how insulation influences the energy efficiency of a building
When there is a temperature differential from outside to inside the home heat escapes the building envelope this is why we need insulation. Especially in roofs and walls as they lose the most amount of heat.
describe how airtight building boosts efficiency
With air tight building it boosts effeciency by lowering energy bills, fewer drafts and less chance of mold.
describe how glazing effects house efficiency
AS 12% of all heat loss in the home comes from the windows it is a good idea to get double or tripled glazed windows to stop as much heat leaking out, however triple is more expensive
What is another name for the “ U value”
Thermal transmittance
What does the “u value” tell us
The U value tells us about a material ability to transmit heat from one point
to another.
Do construction materials have different u values
Yes different materials have different u values
What is the unit for u value
W / m2 / K
What is the rate of heat flow formula
(give units)
rate of heat flow = u value x area x temp difference
Q = U x A x ∆T
Q=w
U=W / m2/ K or W / m2/ °C
A=M2
∆T= k or °C
What is the zero carbon hierarchy from top to bottom
Allowable solutions
on site low carbon,heat and power
Fabric energy effeciency
How can we achieve zero carbon
1- good fabric energy effeciency
2- inclusion of on site low carbon heat and power technologys
3- Use of Allowable Solutions to compensate for carbon emissions that are
difficult to achiever on site.
what is the zero carbon policy
The Zero Carbon Buildings policy forms part of the Governments wider
strategy to achieving the Climate Change Act targets (reduction of 1990 baseline levels by 80% by 2050).
What does the zero carbon policy require and what typed of regulated energy use does this include
This Zero Carbon Buildings policy requires all new homes from 2016 to
mitigate, through various measures, all the carbon emissions on site as a result
of the regulated energy use.
This regulated energy use includes energy used to provide space heating
and cooling, hot water and fixed lighting.
What is BREEAM
Building Research Establishment Environmental Assessment Method
(BREEAM) is the world’s foremost environmental assessment method and
rating system for buildings developed in 1990
How does BREEAM work
BREEAM sets the standards for best practice in sustainable building
design, construction and operation. It encourages designers, clients and others to think about low carbon and
low impact design, minimising the energy demands created by a building
BEFORE considering energy efficiency and low carbon technologies.
what is BREEAM meausered against
A BREEAM assessment uses recognised measures of performance which
are set against established benchmarks. They include aspects related to energy and water use, the internal environment (Health and wellbeing), pollution, transport, materials,
waste, ecology and management processes.
How does breeam help the environementr and people using it
Uses a straightforward scoring system that is transparent, flexible, easy
to understand and supported by evidence-based science and research.
Has a positive influence on the design, construction and management of
buildings.
Defines and maintains a robust technical standard with rigorous quality
assurance and certification.
5 overarching principles of BREEAM
1- Sustainable solutions
2- provides a framework
3-sound science
4-supports change
5-delivers value
what does CSH stand for
Code for sustainable homes
what is the CSH
Csh is an environmental assessment method for rating and certifying the performance of new homes. its a national standard to encourage the construction of sustainable homes
what are the 9 categories of sustainable design in CSH
1 – Energy and CO2 emissions.
2 – Water.
3 – Materials.
4 – Surface Water Run-off.
5 – Waste.
6 – Pollution.
7 – Health and Well Being.
8 – Management.
9 – Ecology.
Discuss three challeneges of getting net zero through csh by the government
1- Domestic housing plays a pivotal role in meeting future climate aims in the
UK as domestic houses account for;
25% of UK GHG emissions.
Over 50% of energy consumption.
8% waste generated .
2-Economic constraints might limit the funding made available to upgrade
homes. Which inturn will mean more older homes and less newer more environmental designs
3Encouraging more large suppliers and manufacturers to source materials in
a sustainable manner.
Discuss three opportunities of getting net zero through csh by the governement
1- Incentive schemes set up like the green deal and the solar heat incentive
2- Sustainable use and sourcing of materials perhaps written into contracts
3-Improved building regulations, i.e. dropping old building regulations, new
zero carbon homes policy to be published in 2016, minimum standard now
equivalent to a level 4 in the old CSH.
