Water Resources Management

, Volume 27, Issue 2, pp 581–599 | Cite as

Assessment of Potable Water Savings in Office Buildings Considering Embodied Energy

Article

Abstract

The objective of this article is to assess the potential for potable water savings in office buildings located in Florianópolis, southern Brazil. The embodied energy of four alternatives to reduce potable water demand, i.e., rainwater harvesting, greywater reuse, dual-flush toilets and water-saving taps, was also assessed. The analyses took into account the potable water end-uses for ten buildings. The potential for potable water savings by using rainwater, as well as, the rainwater tank sizing were estimated using computer simulation. As for greywater reuse, it was considered that greywater from lavatory taps could be treated and reused to flush toilets. The potential for potable water savings by using water-saving plumbing fixtures was estimated by considering the replacement of toilets and taps. In order to estimate the embodied energy in the main components, each system was dimensioned and embodied energy indices were applied. The main result is that the potential for potable water savings by using dual-flush toilets ranges from 21.6 % to 57.4 %; by reusing greywater, it ranges from 6.8 % to 38.4 %; by using rainwater, it ranges from 6.1 % to 21.2 %; by using water-saving taps it ranges from 2.7 % to 15.4 %. However, by considering the embodied energy, the average for the ten buildings indicates that dual-flush toilets are the best choice as it is possible to obtain water savings of 5.50 m3/month per GJ of embodied energy, followed, respectively, by water-saving taps, greywater reuse and rainwater usage. The main conclusion is that the assessment of embodied energy should be considered when evaluating potable water savings in buildings as it helps to identify the best alternatives to save more water while causing less environmental impact.

Keywords

Potable water savings Water end-uses Embodied energy Office buildings 

References

  1. ABNT (1997) NBR 13969 – Tanques sépticos – Unidades de tratamento complementar e disposição final de efluentes líquidos – Projeto, construção e operação [NBR 13969 – Septic tank – Units for treatment and disposal of liquid effluents – Project, construction and operation]. Associação Brasileira de Normas Técnicas, Rio de Janeiro (in Portuguese)Google Scholar
  2. ABNT (1998) NBR 5626 – Instalação predial de água fria [NBR 5626 – Cold water building installation]. Associação Brasileira de Normas Técnicas, Rio de Janeiro (in Portuguese)Google Scholar
  3. Acqualife (2008) Ficha técnica das caixas d’água Makrocaixa [Catalogue on water tank “Makrocaixa”]. Catálogo eletrônico da Acqualife. Available on: <http://www.makrocaixa.com.br/produto_caixa_agua.html#>. Accessed in February 2008 (in Portuguese)
  4. Aladenola OO, Adeboye OB (2010) Assessing the potential for rainwater harvesting. Water Resour Manag 24(10):2129–2137CrossRefGoogle Scholar
  5. ANA, FIESP, SINDUSCON-SP (2005) Conservação e reuso da água em edificações [Conservation and reuse of water in buildings]. São Paulo: Prol Editora Gráfica. Available on: <http://www.ana.gov.br/bibliotecavirtual/arquivos/>. Accessed in February 2008 (in Portuguese)
  6. Chen TY, Burnett J, Chau CK (2001) Analysis of embodied energy use in the residential building of Hong Kong. Energy 26(4):323–340CrossRefGoogle Scholar
  7. Chilton JC, Maidment GG, Marriott D, Francis A, Tobias G (2001) Case study of a rainwater recovery system in a commercial building with a large roof. Urban Water 4:345–354Google Scholar
  8. Cole RJ, Kernan PC (1996) Life-cycle energy use in office buildings. Build Environ 31(4):307–317CrossRefGoogle Scholar
  9. Coombes PJ, Argue JR, Kuczera G (2000) Figtree Place: a case study in water sensitive urban development. Urban Water 1(4):335–343CrossRefGoogle Scholar
  10. Fagan JE, Reuter MA, Langford KJ (2010) Dynamic performance metrics to assess sustainability and cost effectiveness of integrated urban water systems. Resour Conserv Recycl 54(10):719–736CrossRefGoogle Scholar
  11. Ghisi E (2006) Potential for potable water savings by using rainwater in the residential sector of Brazil. Build Environ 41(11):1544–1550CrossRefGoogle Scholar
  12. Ghisi E (2010) Parameters influencing the sizing of rainwater tanks for use in houses. Water Resour Manag 24(10):2381–2403CrossRefGoogle Scholar
  13. Ghisi E, Ferreira DF (2007) Potential for potable water savings by using rainwater and greywater in a multi-storey residential building in southern Brazil. Build Environ 42(7):2512–2522CrossRefGoogle Scholar
  14. Ghisi E, Oliveira SM (2007) Potential for potable water savings by combining the use of rainwater and greywater in houses in southern Brazil. Build Environ 42(4):1731–1742CrossRefGoogle Scholar
  15. Ghisi E, Tavares DF (2008) Netuno – Aproveitamento de água pluvial [Netuno computer programme – Rainwater harvesting]. Available on: <www.labeee.ufsc.br>
  16. Ghisi E, Montibeller A, Schmidt RW (2006) Potential for potable water savings by using rainwater: an analysis over 62 cities in southern Brazil. Build Environ 41(2):204–210CrossRefGoogle Scholar
  17. Gould J (1999) Is rainwater safe to drink? A review of recent findings. 9th International Rainwater Catchment Systems Conference, Petrolina, Brazil. Available on: <http://www.cpatsa.embrapa.br/catalogo/doc/quality/7_4_John_Gould.doc>. Accessed in March 2008
  18. Hamzo ST, Barreto D (2007) Avaliação da economia de água obtida pelo uso de dispositivo seletivo de descarga em bacias sanitárias com caixa acoplada [Assessment of water savings by using dual-flush bowl-and-tank toilets]. X Simpósio Nacional de Sistemas Prediais: Desenvolvimento e inovação, São Carlos-SP, Brazil (in Porguguese)Google Scholar
  19. Handia L, Tembo JM, Mwiindwa C (2003) Potential of rainwater harvesting in urban Zambia. Phys Chem Earth 28(20–27):893–896Google Scholar
  20. Herrmann T, Schmida U (2000) Rainwater utilisation in Germany: efficiency, dimensioning, hydraulic and environmental aspects. Urban Water 1(4):307–316CrossRefGoogle Scholar
  21. Islam M, Chou FNF, Kabir MR, Liaw CH (2010) Rainwater: a potential alternative source for scarce safe drinking and arsenic contaminated water in Bangladesh. Water Resour Manag 24(14):3987–4008CrossRefGoogle Scholar
  22. Jiao Y, Lloyd CR, Wakes SJ (2012) The relationship between total embodied energy and cost of commercial buildings. Energy Build 52(September):20–27CrossRefGoogle Scholar
  23. Minku PM (2005) Tipologias construtivas de edifícios de escritório na cidade de Florianópolis-SC [Typologies of office buildings located in Florianópolis-SC]. Research report, Federal University of Santa Catarina, Florianópolis, Brazil (in Portuguese)Google Scholar
  24. Mo W, Nasiri F, Eckelman MJ, Zhang Q, Zimmerman JB (2010) Measuring the embodied energy in drinking water supply systems: a case study in the Great Lakes Region. Environ Sci Technol 44(24):9516–9521CrossRefGoogle Scholar
  25. Nolde E (2000) Greywater reuse systems for toilet flushing in multi-storey buildings – over ten years experience in Berlin. Urban Water 1(4):275–284CrossRefGoogle Scholar
  26. Proença LC (2007) Usos finais de água potável em edifícios de escritórios localizados em Florianópolis [Potable water end-uses in office buildings located in Florianópolis]. Research report, Federal University of Santa Catarina, Florianópolis, Brazil (in Portuguese)Google Scholar
  27. Proença LC, Ghisi E (2010) Water end-uses in Brazilian office buildings. Resour Conserv Recycl 54(8):489–500CrossRefGoogle Scholar
  28. Pullen SF (1999) Consideration of environmental issues when renewing facilities and infrastructure. 8th International conference on durability of building materials and components, Vancouver, CanadaGoogle Scholar
  29. Rocha VL (2009) Validação do algoritmo do programa Netuno para avaliação do potencial de economia de água potável e dimensionamento de reservatórios de aproveitamento de água pluvial em edificações [Validation of the algorithm of the Netuno computer programme to assess the potential for potable water savings and sizing of rainwater tanks for rainwater usage in buildings]. Masters dissertation. School of Civil Engineering, Federal University of Santa Catarina, Florianópolis, Brazil (in Portuguese)Google Scholar
  30. SABESP (2008) Programa de uso racional de água [Programme for water savings]. Available on: <http://200.144.74.11/pura/cases/default.htm>. Accessed in February 2008 (in Portuguese)
  31. Sartori I, Hestnes AG (2007) Energy use in life cycle of conventional and low-energy buildings: a review article. Energy Build 39(3):249–257CrossRefGoogle Scholar
  32. Sautchúk CA (2004) Código de prática de projeto de execução de sistemas prediais- conservação de água em edifícios [Guidelines on building services design – water savings in buildings]. Programa Nacional de Combate ao Desperdício de Água [National Programme of Avoiding Wasting Water]. Technical report #F3. Brasília, Brazil (in Portuguese)Google Scholar
  33. Schneider (2008) Bombas injetoras: série MBI-1 [Water pumps: series MBI-1]. Digital catalogue for Schneider Pumps. Available on: <http://www.schneider.ind.br/_slg/uploads/18cb29ba6b37dd837620b7591f71763a.pdf>. Accessed in June 2008
  34. Tavares SF (2006) Metodologia de análise do ciclo de vida energético de edificações residenciais brasileiras [Method for assessing energy life cycle of residential buildings in Brazil]. Doctorate thesis. School of Civil Engineering, Federal University of Santa Catarina, Florianópolis, Brazil (in Portuguese)Google Scholar
  35. Treloar GJ, McCoubrie A, Love PED, Iyer-Raniga U (1999) Embodied energy analysis of fixtures, fittings and furniture in office buildings. Facilities 17(11):403–409CrossRefGoogle Scholar
  36. Uchida C, Oliveira LH (2006) As bacias sanitárias com sistema de descarga dual e a redução do consumo de água em edifício residencial multifamiliar [Dual-flush toilets and water savings in a multifamily building]. XI Encontro Nacional de Tecnologia do Ambiente Construído, Florianópolis-SC, Brazil (in Portuguese)Google Scholar
  37. Winther BN, Hestnes AG (1999) Solar versus green: the analysis of a Norwegian row house. Solar Energy 66(6):387–393CrossRefGoogle Scholar
  38. Yurdusev MA, Kumanlıoğlu AA (2008) Survey-based estimation of domestic water saving potential in the case of Manisa City. Water Resour Manag 22(3):291–305CrossRefGoogle Scholar
  39. Zhang X, Hu M, Chen G, Xu Y (2012) Urban rainwater utilization and its role in mitigating urban waterlogging problems: a case study in Nanjing, China. Water Resour Manag 26(13):3757–3766CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media Dordrecht 2012

Authors and Affiliations

  1. 1.Laboratory of Energy Efficiency in Buildings, Department of Civil EngineeringFederal University of Santa CatarinaFlorianópolisBrazil

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