Water efficient retrofits - BRE : Home efficiency/John's... · Water efficient retrofits; the...

transcript

The Chartered Institute of Plumbing &

Heating Engineering

Retrofitting for water efficiencyWater efficient retrofits;

the plumbing and heating professional’s perspective

Heating EngineeringOutline

• Benefits of water efficiency retrofits• Issues and dangers with such retrofits• How pipe systems are designed?• How can the potential for retrofitting be assessed?• Top recommendations

Heating Engineering

Benefits of water efficiency retrofits

• If metered save money• If not metered, good training for when you

are metered• New fittings / appliances for old• Can save energy on hot water production

Heating Engineering

Hot water efficiency guidance

www.holeintheroof.org.uk

Heating Engineering

Issues and dangers with such retrofits

• Use Water Wisely: Save Water Safely• Lifetime homes – ages of occupants• Aspirational living can lead to unsafe plumbing

– create stagnation or long run-offs / mix materials and fittings

• Legionella / Pseudomonas / electrical safety

Heating Engineering

CIPHE P&HE Journals

Heating EngineeringLifetime homes

Heating EngineeringTraditional layouts

Heating EngineeringNew home layouts

Heating Engineering

Prestige homes –aspirational

Heating Engineering

Resulting water supply issues

• Increased areas with little used pipework• Possibly extended run-off times to obtain

water of the desired temperature• Increased simultaneous demand leading to

dissatisfaction with appliances• Health related issues – stagnation / biofilms /

temperature control / bacteria

Heating Engineering

Factors involved in pipe sizing

Heating Engineering

How pipe systems are designed?

• BS 6700, BS EN 806• Loading / Design units and probability• Lifestyle and appliance changes over time• Water efficient appliances and fittings are not

considered• Fear of undersizing – frequent oversizing

Heating EngineeringStandards

Heating EngineeringGuides

Heating EngineeringLUNA

• Loading Unit Normalisation Assessment • Where did loading units come from?• Are there any other methods used today?• Can we do better?

Heating EngineeringLUNA

http://www.environment-agency.gov.uk/business/news/103450.aspx

Heating EngineeringPipework

Pretty and neat- is it safe?

Heating EngineeringPipework

Aims of water pipework:• Convey water to where it is needed• No leaks• Minimal pressure loss• Minimal heat transfer• Minimal contamination• Avoid stagnation and low turn-over• Minimise biofilm and other microbial growth

Heating EngineeringLinear plumbing

• Simple traditional approach• Sentinel fitting is a WC – high volume regular

use (only works on cold water)• Tails to fittings prone to stagnation

Heating Engineering

Looped-linear plumbing

• Simple traditional approach but with minimised tails to fittings

• Sentinel fitting is a WC – high volume regular use (only works on cold water)

Heating EngineeringLooped plumbing

• Loops to all fittings and appliances: minimised tails to fittings

• Both hot and cold supplies are on a loop within the room, but if no appliances are used there will be no circulation

Heating Engineering

Fittings that may be used

Heating EngineeringCirculation fittings

• http://www.delabie.ru/pdf/DOC900INT/5.pdf

Heating EngineeringCirculation fittings

• http://www.delabie.ru/pdf/DOC900INT/5.pdf

Heating Engineering

Circulating the loop-with a pump

Worcester Bosch Technical Bulletin TB050 a (2011/06)

Heating Engineering

Circulating the loop-without a pump

Heating EngineeringVenturi Tee

Heating Engineering

En-suites / utility rooms / outside taps

Heating Engineering

How can the potential for retrofitting be assessed?

• Water audits• DIY / professional• Water Regulations/Byelaws• Water calculators / AECB guide / water bills

Heating EngineeringWater Audits

Heating Engineering

Water Regs and Building Regs

Heating Engineering

Above basin issues:Compromised air gaps

Heating Engineering

Below basin issues:Flexible connections

Heating Engineering

Top recommendations for saving water

• Stop wasting water – fix dripping taps and valves• Fit low volume flush WCs• Use a high efficiency dishwasher as intended• Develop a 10 year plan; to replace less efficient

appliances and fittings, taking into consideration the anticipated occupation level and pattern

Heating EngineeringFix the drips and leaks

Heating Engineering

Top recommendations for retrofitting

• Don’t just replace terminal fittings and appliances – consider the plumbing

• Aim to eliminate any stagnant water• Insulate pipes properly• Fit isolation valves to aid servicing with minimal

disruption and water loss• Protect air gaps• Draw a plan of your water supply and

drainage systems

Heating Engineering

Where does the wastewater go?

www.connectright.org.uk

Heating Engineering

Recommended publications

• Water consumption in sustainable new homes (NF29)

• Water efficiency in new homes (NF20)

Heating Engineering

www.ciphe.org.ukhttps://www.watersafe.org.uk

Heating Engineering

johng@.ciphe.org.uk

Water efficient retrofits - BRE : Home efficiency/John's... · Water efficient retrofits; the...

Documents