Retrofitting for water efficiency

Transcription

1 Retrofitting for water efficiency Water efficient retrofits; the plumbing and heating professional s perspective

2 Outline 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

3 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

4 Hot water efficiency guidance

5 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

6 CIPHE P&HE Journals

7 Lifetime homes

8 Traditional layouts

9 New home layouts

10 Prestige homes aspirational

11 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

12 Factors involved in pipe sizing

13 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

14 Standards

15 Guides

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

17 LUNA

18 Pipework Pretty and neat-is it safe?

19 Pipework 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

20 Linear plumbing Simple traditional approach Sentinel fitting is a WC high volume regular use (only works on cold water) Tails to fittings prone to stagnation

21 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)

22 Looped 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

23 Fittings that may be used

24 Circulation fittings

25 Circulation fittings

26 Circulating the loopwith a pump Worcester Bosch Technical Bulletin TB050 a (2011/06)

27 Circulating the loopwithout a pump

28 Venturi Tee

29 En-suites / utility rooms / outside taps

30 How can the potential for retrofitting be assessed? Water audits DIY / professional Water Regulations/Byelaws Water calculators / AECB guide / water bills

31 Water Audits

32 Water Audits

33 Water Regs and Building Regs

34 Above basin issues: Compromised air gaps

35 Below basin issues: Flexible connections

36 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

37 Fix the drips and leaks

38 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

39 Where does the wastewater go?

40 Recommended publications Water consumption in sustainable new homes (NF29) Water efficiency in new homes (NF20)

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