Presentation on theme: "Homes are: Bathed in free energy from the sun Are brushed by Many cooling breezes And Drenched by free rainwater Yet Rarely do houses make use of that."— Presentation transcript:
Homes are: Bathed in free energy from the sun Are brushed by Many cooling breezes And Drenched by free rainwater Yet Rarely do houses make use of that available energy and water But... All the energy and water required for housing can be gained from a regular housing site at modest cost If... the home and occupants are efficient with the use of the harvested resources.
By making your house more efficient It will- Cost less to run Be more comfortable Minimise energy needs Minimise water needs. Also Potentially cost nothing to run Motivated people with knowledge stand to enjoy great benefits.
Planets needed to support us….. We would need 4 planets if everyone consumed at levels Australians currently do more than we have, if we continue with 'business as usual'. credit:infografik.com Global perspective
Is change is necessary? Humanity depends entirely on the natural world The natural world now depends entirely on humanity. A massively expanding population is consuming and polluting way beyond sustainable levels.
Energy awareness Energy efficiency is cheaper than energy production. - it reduces the need for more power stations. Buildings consume 20% of energy produced in Australia. Large changes to energy costs and carbon pollution can be made if we understand- the relationship of buildings and energy use appliances and energy use.....and energy an understanding of energy itself
How is household energy measured? Understanding Energy. KwH? KwH/Day? MJ? A KwH, Kilowatt/hour is the standard electrical unit of energy measurement. A Megajoule is the standard unit of combustion fuels- ie gas, oil and wood. 1 KWh = 3.6 MJ A traditional analogue meter A new digital smartmeter
Examples of how fast energy is used A kilowatt hour is the energy used by- This size electric heater over 1 hour. (1000 watts for 1 hour) or this gas heater for 10 minutes -(Heater rated at 21 MJ (or 6 KW) or this light bulb for 55 hours (18 watts )
Metering and Billing Electrical in KwH Gas bills in MJ or megajoules Prioritise energy saving strategies by looking at energy use patterns.
The main problems with houses? Most of the 8.7 million existing residences were built without considering the local climate or site. Energy has to date been so cheap, that it has been possible to rely on switching on appliances to create comfortable interiors. not any more... Major issues include: Poorly insulated Windows facing wrong ways Ineffective window coverings Dark coloured roofs Poorly designed downlighting Lack of eaves Lack of trees Unfavourable orientation credit: Nearmap.com
What can householders do? Cost Free Low cost Relatively high cost... to maintain or improve comfort levels while reducing the cost of living. The way the house and appliances are used has a large impact upon energy saving and the cost of living. Effects reduce bills, increase comfort large long term savings Actions Behavioural -ie opening & shutting windows & curtains. Low- tech ie installation of pelmets, low flow showers High tech installation of Solar hardware
Some options for saving energy and water. Renovating or extending is the perfect time to make substantial improvements to energy and water conservation. Other ideas will apply to specific house types. Some ideas will apply to almost all houses Good design costs no more than poor design - -just the right people, with the right ideas.
Huge savings can be made by landscaping and adopting simple principles. keep the sun off your house walls in summer. let the sun flood through your windows in winter passive solar design Ensure all northern windows have eaves credit:yourhome.gov.au
Priorities for Winter 1 Conserve energy Not much point buying energy when it is leaking from your house! Stop the heat leaking from your house! Curtains and pelmets Block all holes -halogens, - fans -door cracks Insulation If doing renovations, ensure correct insulation goes in all walls! radiation through windows radiation through wall from fireplace credit: ves energy store
Priorities for Winter- 2 Window areas are responsible for a large amount of heat loss. The most effective window dressings by far are: Thermal curtains and pelmets or Cellular Blinds- recessed into window frames Both options need to be close fitting, eliminating air gaps at sides, tops and bottoms. credit: energy.sa gov.au credit: hunter douglass
Priorities for Winter 3 Bulk insulation - ie batts, cellulose fibre, etc. in walls, ceiling and floor. where possible. ( R3.6 - R4 ) Early model skylights are a major source of heat loss- install extra layer of glazing at ceiling level. Exhaust fans can leak large amounts of heat from a house. -Fit with a self closer, or replace with a self closing unit
Priorities for winter -4 Let the sun shine in! -ie for every 2 square meters of window, the sunlight brings in the same heat as this heater, but for free. "passive solar heating" Winter sun radiates 500 watts / sq M.
Summer priorities-1 Plant trees and shrubs to prevent morning and afternoon sun getting onto or into your house to the east and west. Suburbs and towns, & regions have been shown to be 2-4 degrees cooler in summer, if well vegetated keep northern roof space in the sun in case you want to install solar hot water, or solar electric.
Summer priorities-2 Install reflective foil under the iron, tiles or rafters. install eaves over northern windows insulate and line the verandah shade east and west windows from the exterior Summer sun radiates 1000 watts sq / m
Summer priorities- Keeping cool Breezes- free Ceiling fans, or pedestal fans- about 1 cent/ hour Average modern reverse cycle A/C (2.6 Kw) -about 50 cents-$1.04/hour -Requires thoughtful planning but great rewards credit: yourhome
Summer- Different approaches
Issues with down-lights There is a continuous heat loss during winter through the ceiling around the light fitting, as insulation must be kept clear. heat gain in summer
Appliances and energy ratings Star rating is relative efficiency. The number gives the actual energy consumed per year (average use) It is easy to calculate how much an appliance will cost to run. Multiply Kwh/ year (on sticker) x current unit cost of electricity. (Efficiency standards are improved every few years, last done April 2010.
Priorities for water Quality low-flow shower- head litres / min. 4 star dual flush toilets connect toilets to rainwater consider a composting toilet (no water, no smells, good compost) rebates are available for most water saving and rainwater tanks. Get the largest tank feasible tank specialist or 'enviro plumber'
HOME POWER SAVINGS PROGRAM Free help for pensioners and families on a low income to save up to 20% off their power use
Who is eligible? Contribute to the energy bills for the property Be an energy utility hardship customer OR have one of the following: o Centrelink Pensioner Concession Card o Centrelink Low Income Health Care Card o Department of Veterans’ Affairs Pensioner Concession Card o Department of Veterans’ Affairs Repatriation Health Card (White or Gold) This program is open to both renters and owner occupiers
Get cash back to green your home The NSW Government’s $170 million Home Saver Rebates include: $300 for solar, heat pump and gas hot water systems replacing electric systems $35 for removal of old working second fridge (Central Coast only) Up to $1,500 for rainwater tanks that are connected to a washing machine and toilet $200 for a 4 star dual flush toilet suite to replace a single flush toilet $150 for installing a hot water circulator for instantaneous gas hot water. $1000 Federal Government rebate for solar hot water HEAVY DISCOUNTS for shower head, toilet and plumbing in Hunter Water supply region and includes Port Stephens, Dungog, Cessnock, Maitland, Newcastle and Lake Macquarie and part of the Singleton shire
Future developments relating to household energy. Carbon tax - Encourage energy efficiency Provide an incentive for developers, home-owners and landlords to make houses more efficient. Put pressure on appliance manufacturers to make them more efficient target the root problem (Avoid tax by minimising energy use) Energy ratings for houses and units. This will- Provide potential purchasers or tenants a clear indication of likely operational costs. Provide incentive to improve the thermal performance of houses
Solar energy options. Thank you. evacuated tube - 'split system' evacuated tube- thermo-syphon solar electric (PV) flat panel thermo-syphon Heat pump Ensure solar companies are CEC certified (CleanEnergyCouncil.org.au)
thank you Currently the only abundant source of renewable, sustainable energy