Water Efficiency Presentation
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How and why saving water is a good idea. A presentation from Oliver Musgrave from the Energy Savings Trust Scotland.
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Water Efficiency Presentation
- 1. Water Efficiency Oliver Musgrave Water efficiency advisor Energy Saving Scotland advice centre
- 2. How many litre bottles of water would it take to fill Murryfield ? Answer: 1 billion
- 4. Decrease Energy Utility Bills Decrease Carbon Emissions Ensure Sustainable Water Extraction
- 5. Water and carbon emissions Largest consumer of electricity in Scotland 5% of UK carbon emissions
- 6. Carbon emissions in existing home Water consumption in litres/day for an average 2.4 occupancy household
- 7. Fuel bills = 30% of gas bill £200
- 8. Three areas of the home
- 9. Technology
- 10. Aerating or twin jet products Flow restrictors Energy efficient appliances Cistern displacement devices
- 12. Maintenance
- 13. Insulate water pipes Insulate hot water tank Insulate any visible hot water pipes
- 14. Fix leaking taps Leaking tap Up to 5500 litres per tap a year
- 15. Behaviour
- 16. What is more energy efficient? Bath Shower Versus
- 17. Average flow rate by shower type Shower type Litres/Minute Range Electric 6 3 - 9 Mixer: Gravity fed 9 4 - 14 Mixer: Mains fed 15 12 - 25 Aerated or water efficient 8 6 - 8 Power shower* 15 13 - 16 Super Sized Showerhead 25 20 – 35 Multiple showerheads 45 30 +
- 19. What is more efficient? Versus Dishwasher Hand washing
- 21. In the garden
- 22. Car washing
Editor's Notes
- Water efficiency and why we need to save water
- Taken from EST email that volume of Murray field is approximately 1 million meters cubed = 1000,000,000 / 471650/ 150 = 14 days 471650 stats http://www.sns.gov.uk/Reports/Report.aspx?ReportId=1&PostCode=EH6 7LY Edinburgh uses 1 Murryfield every 14days (laid end to end water bottles assuming 30 cm 300,000 KM approx 7 ½ time round the earth)
- What about Climate Change? While it is predicted that Scotland will have wetter winters this will be combined with dryer summers when demand for water is at its greatest TO CHECK FIGURES ARE OK TO USE
- Why should we save water
- Link between Water and carbon emissions – Processing Pumping Cleaning Dealing with waste Heating our water requires massive amounts of energy Scottish Water is the largest single consumer of electricity in Scotland mainly due to electricity required for pumping (waterwise) further carbon emissions are also created by energy used to clean water and deal with waste water. The energy needed to treat and pump mains water to our homes, and to collect and treat waste water from the sewage network is responsible for nearly 1% of the UK’s annual greenhouse gas emissions . In the Home – Additional carbon emissions are created by heating hot water and in the UK as a whole 5% of our total carbon emissions are from heating hot water So heating your water in your shower or your bath , boiling the kettle, washing your clothes and dishes can have a major environmental impact. If every UK home reduced their hot water use by just 5%, the CO2 saving would be around one and a half times greater than the total CO2 emitted from all the homes in Edinburgh
- 11% of carbon emissions are from supply and 88% from use in the home Why are C02 emissions in the home much higher than those from the supply system the reason is Hot Water Washing machine/ showers if you wash your clothes at 30 degrees rather than hotter temperatures Washing clothes at 30 degrees instead of higher temperatures uses around 40% less electricity (saving you around £10 a year) Modern washing powders and detergents work just as effectively at lower temperatures so unless you have very dirty washing, bear this in mind. Charts References “ 2009 EST Draft Tech Sum Quantifying the energy and carbon effects of saving water” Water consumption in litres/day for an average 2.4 occupancy household p.3 “ 2009 EST Draft Tech Sum Quantifying the energy and carbon effects of saving water” Carbon emissions in existing home p.37
- Heating water for use in taps, baths and showers makes up around 30% of average household's gas bills - that's around £200 a year - and could well cost even more if you use an electric immersion heater
- Which three areas in the home do you commonly use water?
- Baths Water efficient bath Aerated shower- 8 litres per minute (save £20 a year by having this than a power shower) Power shower- 15 litres per minute Gravity fed shower-
- Taps and Showers As we saw with the tap aerators; fitting requirements can vary. The customer can be given the available options but it is their responsibility to choose Low flow already Some manufacturers claim that using an aerated showerhead/water efficient shower head can damage power shower pumps – customer should check with manufacturer regarding this issue Pressure may not allow low flow e.g. two stage/click taps not advisable with pressure of less than 1 bar.
- Insulating your hot water cylinder is one of the simplest and easiest ways to save energy and money in your home. Putting a 75mm thick hot water cylinder jacket on your hot water will save around £35 a year . By insulating any visible hot water pipes you can save around £10 more off your annual gas bill
- 5500 litres = Approx 37 days of water consumption
- To elucidate the importance of behaviour lets look at a commonly held belief baths are less efficient that showers
- Electric showers Electric showers: Electric showers pump and heat water by themselves. They tend to have a lower flow rate and are often installed in cases where there isn’t enough pressure or reliable hot water to feed a mixer shower. Mixer showers – wall mounted/bath Mixer showers are supplied with hot and cold water directly from the home’s plumbing. They tend to be installed in homes with enough water pressure to deliver a good flow. Power showers Power showers are mixer showers with integral pumps which increase the rate of flow from the shower head. They can only be installed on low pressure, tank fed systems. Note here the vast difference between the water consumption of water efficient showers versus super sized/multiple shower head systems.
- Real potential as so many carbon emissions related to individuals usage After 7 minutes more carbon emissions from a shower than a bath if you have a power shower Electric showers is next even though it is likely to have a lower flow rate than the mixer shower Bath is 80 litres to over flow For every minute you spend in the shower it costs you between £5-10 over the year
- The frequently asked question “What is better washing-up or a dishwasher” could be a Mastermind topic. It depends on a number of factors. New dishwashers are very efficient using as little as 10 litres of water to wash a full load. People can sometimes be much less efficient than this. However, dishwashers are cold fill so the water is heated electrically – this could mean a higher carbon emission. Conclusion – dishwashers are more water efficient than most ‘hand washers’ and may use less carbon. However, a careful washer-upper probably wouldn’t be better off with a dishwasher. Again it is very behaviour dependent. Scrape before washing Use water in sink/bowl Set hot water temperature correctly
- Fill machine before use Use shorter/cooler reduce energy consumption. It is uncertain what impacts it will have on water, as some machines may use more cold water to compensate for lower temperatures Treating stains can be more effective on them than turning up the temperature and will help save householder energy Washing at 30 degrees can save around 40% of the energy used .
- Timing watering : Water in the morning and evening to reduce evaporation losses Sprinklers : Can use up to 1000 litre of water per hour Watering cans : A watering can will use around 7 litre per fill, more control over how much water is used Mulching: Use mulch and bark in your garden to reduce evaporation by up to 75% Water Butt : Collect between 100-190 litres of rainwater for your garden Hosepipes : Can use up to 1000 litres per hour. Fit a trigger nozzle to the end of your hose to help you control how much water you use in the garden. Drought resistant plants : use plants that require less water
- Car washing: Use a bucket and sponge to wash your car. Just 30 minutes with a hosepipe will waste hundreds of litres. Using a bucket will give your car a much more precise wash. If you must use a hosepipe, attach a trigger nozzle
- Short Showers Wash your clothes at 30 ° Do full loads Wash up in a bowl Fix leaking taps Lag hot water pipes Put a jacket on your water tank Use a cistern displacement device Fit a flow regulator or an aerator Only fill the kettle with just the amount of water you need to boil Use a watering can rather than a hose for both the garden Use a bucket and sponge for the car