Eric Larson<br />MSEE, PhD Candidate<br />University of Washington<br />ACEEE Hot Water Forum<br />May 13, 2010<br />desig...
	water efficiency 		starts in the home<br />water tower<br />bathroom 1<br />hose<br />spigot<br />kitchen<br />thermal <b...
what about where			water goes?<br />water tower<br />bathroom 1<br />22%<br />hose<br />spigot<br />kitchen<br />thermal <...
how to<br />sense?<br />valve level <br />		disaggregation<br />easy to install<br />					low-cost<br />						reliable<br />
water meters?<br />typical water meters<br /><ul><li> only provide aggregate information on water usage
require pipe modification for installation</li></ul>AMR<br />
what about pressure?<br />hydrosense<br />
hydrosense<br />toilet<br />hose<br />spigot<br />kitchen sink <br />(cold)<br />thermal <br />expansion <br />tank<br />k...
raw bathroom sinksignal<br />open<br />valve<br />close<br />valve<br />stabilized <br />pressure drop<br />time (t)<br />
some possible installation points<br />water tower<br />bathroom 1<br />hose<br />spigot<br />kitchen<br />thermal <br />e...
	validation<br />ten locations<br />	- 8 houses<br />	- 1 apt / 1 cabin<br />size<br />	- avg: 2,300 sq ft<br />	- min: 75...
 706 trials
 84 total fixtures  </li></li></ul><li>fixture classification results<br />
fixture classification results across homes<br />
  who values from 	  disaggregated water?<br />homeowners<br />	 utilities<br />		 appliance manufacturers<br />			commerc...
disaggregated usage: utilities and homeowners<br />
tiered pricing: utilities<br />leaks?<br />by fixture<br />by time <br />
manufacturers and 		   	policy makers: 		end use efficiency<br />
water conscious practices: 			business<br />1995 USGS<br />
continuing work<br />
longitudinal data collection<br />
future work<br />
Thank You!<br />students<br />faculty<br />ShwetakPatel<br />Tim Campbell<br />Eric Larson<br />Les Atlas<br />  Marilyn O...
backup slides<br />
Ground Truth<br />
Ground Truth<br /><ul><li>Need for reliable ground truth under naturalistic usage patterns
Challenges
Many different styles of faucet, showers, dual/single handle, toilets, clothes washers, dishwashers
Hot/Cold must be disambiguated
Wireless network</li></li></ul><li>
using ∆pressure to estimate flow<br />∆P = change in pressure<br />L = length of pipe<br />r = radius of pipe<br />μ = vis...
using ∆pressure to estimate flow<br />∆P = change in pressure<br />L = length of pipe<br />r = radius of pipe<br />μ = vis...
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HydroSense for Water Management Scientists

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HydroSense as an application space for end use efficiency.

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HydroSense for Water Management Scientists

  1. 1. Eric Larson<br />MSEE, PhD Candidate<br />University of Washington<br />ACEEE Hot Water Forum<br />May 13, 2010<br />design:<br />use:<br />ubicomp lab<br />build:<br />university of washington<br />university of washington<br />
  2. 2. water efficiency starts in the home<br />water tower<br />bathroom 1<br />hose<br />spigot<br />kitchen<br />thermal <br />expansion <br />tank<br />hot <br />water heater<br />bathroom 2<br />
  3. 3. what about where water goes?<br />water tower<br />bathroom 1<br />22%<br />hose<br />spigot<br />kitchen<br />thermal <br />expansion <br />tank<br />dishwasher<br />11%<br />hot <br />water heater<br />bathroom 2<br />laundry<br />
  4. 4. how to<br />sense?<br />valve level <br /> disaggregation<br />easy to install<br /> low-cost<br /> reliable<br />
  5. 5. water meters?<br />typical water meters<br /><ul><li> only provide aggregate information on water usage
  6. 6. require pipe modification for installation</li></ul>AMR<br />
  7. 7. what about pressure?<br />hydrosense<br />
  8. 8. hydrosense<br />toilet<br />hose<br />spigot<br />kitchen sink <br />(cold)<br />thermal <br />expansion <br />tank<br />kitchen sink (hot)<br />dishwasher<br />hot <br />water heater<br />laundry<br />
  9. 9. raw bathroom sinksignal<br />open<br />valve<br />close<br />valve<br />stabilized <br />pressure drop<br />time (t)<br />
  10. 10. some possible installation points<br />water tower<br />bathroom 1<br />hose<br />spigot<br />kitchen<br />thermal <br />expansion <br />tank<br />incoming cold water from supply line<br />dishwasher<br />pressure regulator<br />hot <br />water heater<br />bathroom 2<br />laundry<br />
  11. 11. validation<br />ten locations<br /> - 8 houses<br /> - 1 apt / 1 cabin<br />size<br /> - avg: 2,300 sq ft<br /> - min: 750 sq ft<br /> - max: 4,000 sq ft<br />install point:<br /> - 8 hose bib<br /> - 1 water heater<br /> - 1 utility faucet<br /><ul><li> ten locations
  12. 12. 706 trials
  13. 13. 84 total fixtures </li></li></ul><li>fixture classification results<br />
  14. 14. fixture classification results across homes<br />
  15. 15. who values from disaggregated water?<br />homeowners<br /> utilities<br /> appliance manufacturers<br /> commercial businesses<br />
  16. 16. disaggregated usage: utilities and homeowners<br />
  17. 17. tiered pricing: utilities<br />leaks?<br />by fixture<br />by time <br />
  18. 18. manufacturers and policy makers: end use efficiency<br />
  19. 19. water conscious practices: business<br />1995 USGS<br />
  20. 20. continuing work<br />
  21. 21. longitudinal data collection<br />
  22. 22. future work<br />
  23. 23. Thank You!<br />students<br />faculty<br />ShwetakPatel<br />Tim Campbell<br />Eric Larson<br />Les Atlas<br /> Marilyn Ostergren<br />James Fogarty<br />Jon Froehlich<br />eric.cooper.larson@gmail.com<br />http://ubicomplab.cs.washington.edu<br />design:<br />use:<br />ubicomp lab<br />build:<br />university of washington<br />university of washington<br />
  24. 24. backup slides<br />
  25. 25. Ground Truth<br />
  26. 26. Ground Truth<br /><ul><li>Need for reliable ground truth under naturalistic usage patterns
  27. 27. Challenges
  28. 28. Many different styles of faucet, showers, dual/single handle, toilets, clothes washers, dishwashers
  29. 29. Hot/Cold must be disambiguated
  30. 30. Wireless network</li></li></ul><li>
  31. 31. using ∆pressure to estimate flow<br />∆P = change in pressure<br />L = length of pipe<br />r = radius of pipe<br />μ = viscosity of liquid<br />Q = volumetric flow rate<br />pipe<br />r<br />L<br />poiseuille’s law:<br />fluid resistance formula:<br />
  32. 32. using ∆pressure to estimate flow<br />∆P = change in pressure<br />L = length of pipe<br />r = radius of pipe<br />μ = viscosity of liquid<br />Q = volumetric flow rate<br />pipe<br />r<br />L<br />
  33. 33. water tower<br />acquiring Rf<br />bathroom 1<br />hose<br />spigot<br />kitchen<br />thermal <br />expansion <br />tank<br />incoming cold water from supply line<br />dishwasher<br />pressure regulator<br />hot <br />water heater<br />bathroom 2<br />laundry<br />
  34. 34. flow estimation results<br />
  35. 35. flow estimation results<br />
  36. 36. flow estimation using interpolated Rf<br />After 5 Rfsamples, average error is 0.27 GPM<br />
  37. 37. future work: hydrosense 2.0<br />

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