Journal of the Korean housing association (한국주거학회논문집)

The Korean Housing Association (한국주거학회)
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Life-cycle Cost Analysis of Using Rainwater Harvesting Systems in Hong Kong Residential Buildings

홍콩 주거건물에서 우수활용시스템의 생애주기비용분석

  • Gao, Xing (Evergrande Group) ;
  • Kim, Youngchul (Department of Civil and Architectural Engineering, City University of Hong Kong) ;
  • Lee, Hyun Woo (School of Civil and Construction Engineering, Oregon State University)
  • Received : 2013.12.30
  • Accepted : 2014.06.12
  • Published : 2014.06.25
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Abstract

This paper investigates whether the use of Rainwater Harvesting Systems (RWHSs) to provide water for washing machines in Hong Kong residential buildings would be financially attractive. In such systems, rainwater is accumulated and reused for doing laundry, garden irrigation, flushing toilets, and even drinking. Thus, the analysis of RWHSs' financial feasibility is essential for construction projects. RainCycle is used to validate financial feasibility, considering particular circumstances and data relevant to the Hong Kong context. A range of different scenarios by adjusting three factors are evaluated: catchment area, water demand, and discount rate. It is suggested that $2,000m^2$ would be a suitable catchment area in a typical Hong Kong residential building and it is demonstrated how water demand and discount rate influence the financial performance of RWHSs. In particular, the financial performance of RWHSs is sensitive to discount rates. The results suggest that the RWH system would be worthwhile for buildings with a lower number of floors, but would barely achieve financial validation in Hong Kong's super high-rise residential buildings.

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References

  1. Chen, T. Y., Burnett, J., & Chau, C. K. (2001). Analysis of embodied energy use in the residential building of Hong Kong. Energy, 26(4), 323-340. https://doi.org/10.1016/S0360-5442(01)00006-8
  2. Farreny, R., Gabarrell, X., & Rieradevall, J. (2011). Costefficiency of rainwater harvesting strategies in dense Mediterranean neighbourhoods. Resources, Conservation and Recycling, 55(7), 686-694. https://doi.org/10.1016/j.resconrec.2011.01.008
  3. Gabe, J., Trowsdale, S., & Mistry, D. (2012). Mandatory urban rainwater harvesting: learning from experience. Water Science and Technology, 65(7), 1200. https://doi.org/10.2166/wst.2012.955
  4. Ghisi, E., Montibeller, A., & Schmidt, R. W. (2006). Potential for potable water savings by using rainwater: An analysis over 62 cities in southern Brazil. Building and Environment, 41(2), 204-210. https://doi.org/10.1016/j.buildenv.2005.01.014
  5. Gladney, W. R. (2004). Water filter for clothes washing machine. U.S. Patent Application 10/800, 996.
  6. Hajkowicz, S., & Young, M. D. (2002). An economic analysis of revegetation for dryland salinity control on the Lower Eyre Peninsula in South Australia. Land Degradation & Development, 13(5), 417-428. https://doi.org/10.1002/ldr.527
  7. Hong Kong Housing Authority (2013). Housing in Figures 2013, Hong Kong Housing Authority, the Government of the Hong Kong Special Administrative Region, http://www.housingauthority.gov.hk/en/common/pdf/about-us/publications-and-statistics/HIF.pdf (accessed on December 23, 2013).
  8. Khastagir, A., & Jayasuriya, N. (2010). Optimal sizing of rain water tanks for domestic water conservation. Journal of Hydrology, 381(3), 181-188. https://doi.org/10.1016/j.jhydrol.2009.11.040
  9. Leggett D., Brown, R., Stanfield, G., Brewer, D., & Holliday, E. (2001). Rainwater and greywater use in buildings: decision-making for water conservation. PR80, London: Construction Industry Research & Information Association (CIRIA).
  10. Leggett D., Brown, R., Brewer, D., Stanfield, G., & Holliday, E. (2001a). Rainwater and greywater use in buildings: best practice guidance. Publication C539, London: Construction Industry Research & Information Association (CIRIA).
  11. Mbilinyi, B. P., Tumbo, S. D., Mahoo, H. F., Senkondo, E. M., & Hatibu, N. (2005). Indigenous knowledge as decision support tool in rainwater harvesting. Physics and Chemistry of the Earth, Parts A/B/C, 30(11), 792-798. https://doi.org/10.1016/j.pce.2005.08.022
  12. Morales-Pinzon, T., Luruena, R., Rieradevall, J. Gasol, C. M. & Gabarell, X. (2012). Financial feasibility and environmental analysis of potential rainwater harvesting system case study in Spain. Resources, Conservation and Recycling, 69, 130-140. https://doi.org/10.1016/j.resconrec.2012.09.014
  13. Rahman, A., Keane, J., & Imteaz, M. A. (2012). Rainwater harvesting in Greater Sydney: Water savings, reliability and economic benefits. Resources, Conservation and Recycling, 61, 16-21. https://doi.org/10.1016/j.resconrec.2011.12.002
  14. Roebuck, R. M., & Ashley, R. M. (2006). Predicting the hydraulic and life-cycle cost performance of rainwater harvesting systems using a computer based modelling tool. Proceeding of the 4th International Conference on Water Sensitive Urban Design, April, 2-7.
  15. Roebuck, R. M., OlteanDumbrava, C., & Tait, S. (2011). Whole life cost performance of domestic rainwater harvesting systems in the United Kingdom. Water and Environment Journal, 25(3), 355-365. https://doi.org/10.1111/j.1747-6593.2010.00230.x
  16. Shaffer, P., Elliott, C., Reed, J., Holmes, J. & Ward, M. (2004) Model agreements for sustainable water management systems: model agreements for rainwater and greywater use systems. CIRIA Report C626, London.
  17. Srinivasan, V., Gorelick, S. M., & Goulder, L. (2010). A hydrologic-economic modeling approach for analysis of urban water supply dynamics in Chennai, India. Water Resources Research, 46(7), W07540.
  18. Ward, S., Memon, F. A., & Butler, D. (2010). Rainwater harvesting: model-based design evaluation. Water Science & Technology, 61(1), 85-96. https://doi.org/10.2166/wst.2010.783
  19. Ward, S., Memon, F. A., & Butler, D. (2012). Performance of a large building rainwater harvesting system. Water Research, 46(16), 5127-5134. https://doi.org/10.1016/j.watres.2012.06.043
  20. Villarreal, E. L., & Dixon, A. (2005). Analysis of a rainwater collection system for domestic water supply in Ringdansen, Norrkoping, Sweden. Building and Environment, 40(9), 1174-1184. https://doi.org/10.1016/j.buildenv.2004.10.018
  21. Water Supplies Department (2012). Annual Report 2011/12, Water Supplies Department, the Government of the Hong Kong Special Administrative Region.
  22. Water Supplies Department (2013). Domestic Water Consumption Survey, Water Supplies Department, the Government of the Hong Kong Special Administrative Region, http://www.wsd.gov.hk/filemanager/en/content_523/factsheet_e.pdf (accessed on December 23, 2013)
  23. Water Supplies Department (2013) Seawater for Flushing, Water Supplies Department, the Government of the Hong Kong Special Administrative Region, http://www.wsd.gov.hk/en/water_resources/water_treatment_and_distribution_process/seawater_for_flushing/ (accessed on December 23, 2013)
  24. Wong, L. T. (2011) Significance of water circumstances and the saving water in Hong Kong, Proceedings of the First Symposium of Asian Saving Water Council: Toward the saving water type society, 163-169.
  25. Zhang, Y., Chen, D., Chen, L., & Ashbolt, S. (2009). Potential for rainwater use in high-rise buildings in Australian cities. Journal of environmental management, 91(1), 222-226. https://doi.org/10.1016/j.jenvman.2009.08.008