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Journal of Energy in Southern Africa

versión On-line ISSN 2413-3051
versión impresa ISSN 1021-447X

J. energy South. Afr. vol.23 no.2 Cape Town  2012

 

Economic and environmental analysis of solar water heater utilisation in Gauteng Province, South Africa

 

 

Enver Doruk Özdemir; Sheetal Dattatraya Marathe; Jan Tomaschek; Audrey Dobbins; Ludger Eltrop

Institute of Energy Economics and the Rational Use of Energy, University of Stuttgart, Stuttgart, Germany

 

 


ABSTRACT

This paper focuses on the energy economics and environmental impacts of solar water heaters (SWH) in the Gauteng Province and compares the results with other technology options for residential water heating with regard to the different income groups. The critical energy situation in South Africa and the highly coal dependent energy generation demonstrates the need to shift to a more sustainable way of living. The residential sector proves to be an optimal starting point to implement new technologies, especially for water heating. The residential hot water demand calculation shows that the annual demand in Gauteng is about 188 million cubic meters. In order to satisfy this demand, different technologies are investigated in this paper, where SWHs lie in focus. Due to the vast income inequality in Gauteng, and also in South Africa, it is obvious that there cannot be one single optimal solution suitable to all households. Therefore, this paper focuses on the differentiation of the residential sector into income groups to show the divergence in warm water demand and the applicability of alternative technologies. In order to analyse appropriate solutions for all income groups, low-cost alternatives are also analysed. The economic analysis shows that although SWHs have higher investment costs than conventional technologies, the payback periods are relatively short (between 3 and 4 years) for high and mid income groups. The payback periods will be even shorter when the planned electricity price tariff increase comes into effect. Furthermore, SWH utilisation has the additional effect of reducing the overall electricity demand up to 70% and greenhouse gas emissions significantly. In addition, SWHs

Keywords: solar water heaters, abatement cost, annual expenditure, GHG emissions, income groups


 

 

Full text available only in PDF format.

 

Acknowledgements

This research is part of the larger Megacity Research Project, EnerKey, which is a German-South African collaboration to develop an integrated energy and climate change concept for Gauteng Province in South Africa, funded by the German Ministry of Education and Research.

The authors appreciate the efforts of Miraç Gül for data collection, Lyudmyla Reva and Andrea Adam for editing.

 

References

ALT-E Technologies (2009). Renewable Energy Solutions - data sheets. Available at: http://www.alte.co.za/products_solarwater.html (Accessed July 2009).         [ Links ]

Asif, M. and Muneer, T., (2006). Life cycle assessment of built-in-storage solar water heaters in Pakistan. Building Services Engineering Research and Technology, 27(1), pp.63-69.         [ Links ]

Basson, J.A., (1983J. Die Verwarming van Huishoudelike Water. Pretoria: National Building Research Institute, CSIR.         [ Links ]

Bosch, (2009). Bosch Gas Water Heaters - Price List January 2009. Midrand: Bosch BSH. Available at: http://www.gasexperts.co.za/images/Bosch/Bosch_Gas_WH.pdf (Accessed July 2009).         [ Links ]

Cawood, W., (2002). Baseline study - Solar energy in South Africa 2000-2001. Report prepared for DANCED.         [ Links ]

Cawood, W. and Simelane, R.B., (2004). The application of solar water heaters in low cost housing. In: Domestic Use of Energy Conference 2004. Kloof 2004        [ Links ]

City of Cape Town, n.d.. Thermal efficiency upgrade in low-income housing in Kuyasa, South Africa. Available at: http://www.snm.nl/pdf/0500_2.6_thermal_efficiency_upgrade_in_low_income_housing_in_kuyasa__background_paper.pdf (Accessed July 2009).         [ Links ]

City Power (2009). (unpublished) Electricity consumption data for July 2006 - June 2007.         [ Links ]

CURES (2009). Exploring energy poverty in South Africa. CURES Discussion document. Midrand. Available at: http://www.cures.co.za (Accessed July 2009).         [ Links ]

Denholm, P. and Margolis, R., (2008). Supply Curves for Rooftop Solar PV-Generated Electricity for the United States. Technical Report NRELVTP-6A0-44073. National Renewable Energy Laboratory.         [ Links ]

Diekmann, O. et al., (1998). Politikszenarien für den Klimaschutz, Band 3: Methodikleitfaden für die Wirkungsabschätzung von Maßnahmen zur Emissionsminderung. Jülich.         [ Links ]

DME (2005). Energy Price Report. Pretoria: Department of Mineral and Energy. Available at: http://www.dme.gov.za/pdfs/energy/statistics/PriceReport%202005.pdf.         [ Links ]

Dobbins, A. et al., (2009). Role of energy models in local energy planning to support the roll-out of solar water heaters in Gauteng, South Africa. In: International Urban Planning and Environment Association, UPE8 - Parallel Patterns of Urban Growth and Decline Symposium. Kaiserslautern, Germany 23 - 26 March 2009.         [ Links ]

DOE (2009). Energy Savers - heat pump and efficiency. U.S. Department of Energy. Available at: http://www.energysavers.gov/your_home/space_heating_cooling/index.cfm/mytopic=12620 (Accessed July 2009). DoT (2003). National Household Travel Survey, 2003. Available at: http://www.transport.gov.za/projects/nts/ (Accessed March, 2009).         [ Links ]

Eighty20 (2008). Database query. Available at: http://www.eighty20.co.za/databases/index.cgi (Accessed 10 April 2009).         [ Links ]

Ekurhuleni (2005). State of Energy Report. City of Ekurhuleni. Available at: http://www.ekurhuleni.gov.za/business/useful-resources/enviro-reports/doc_download/309-state-of-energy-report-2005 (Accessed July 2009).         [ Links ]

Eskom, (2008). Eskom Annual Report 2008. Available at: http://www.eskom.co.za/c/84/annual-report/ . (Accessed 24 November 2011).         [ Links ]

Eskom (2009). Demand Side Management - Price List. Available at: http://www.eskomdsm.co.za/sites/default/files/u1/2009_07_02Accrparticipartsuppllistpdf (Accessed July 2009).         [ Links ]

FNR (2007). Bioenergie Basisdaten Deutschland. Available at: http://www.nachwachsende-rohstoffe.de. (Accessed July 2009).         [ Links ]

GCRO, 2009. Quality of Life survey. Available at: http://www.gcro.ac.za/projed/quality-life-survey. (Accessed July 2009).         [ Links ]

GEMIS (2009). Globales Emissions-Modell Integrierter Systeme. Available at: http://www.gemis.de (Accessed November 2011).         [ Links ]

GIES (2010). Gauteng Integrated Energy Strategy. Johannesburg: Gauteng Department of Local Government and Housing. Available at: http://www.dlgh.gpg.gov.za/Documents/Energy%20Stratergy/GIESPart1Part5FinalWeb25Mar10%5B1%5D.pdf (Accessed March 2010).         [ Links ]

Green, (2004) The impact of solar water heaters on households in low income townships in Durban. In: Domestic Use of Energy Conference 2004.         [ Links ]

Hector, S., Knoll, M., Wehnert, T., (2009). Proposal to Configure Household Income Groups, EnerKey Working Paper. Available at http://www.enerkey.info (Accessed March 2010).         [ Links ]

Holm, D., (2005). Market survey of solar water heating in South Africa for the Energy Development Corporation (EDC) of the Central Energy Fund (CEF). Pretoria: SolaSure. Available at: http://www.cef.org.za/solar_market_survey.pdf (Accessed May 2011).         [ Links ]

Home Comfort (2009). Solar Energy Solar Heating. Available at: http://www.homecomfort.co.za/solar-heating.html (Accessed July 2009).         [ Links ]

Hudu, 2009. Solar Water Heating, Solar Energy, Wind Power or Hybrid Systems - data sheets. Available at: http://www.hudu.co.za/solar_water_integrated.html (Accessed July 2009).         [ Links ]

IBP (2009). Status of work for Module 3 of EnerKey project. Research report. IBP Available at: http://www.enerkey.info/images/stories/downloads/M3-EnerKey_StatusSeminar.pdf (Accessed September 2011).         [ Links ]

IER (Institut for Energy Economics and the Rational Use of Energy), University of Stuttgart (2010) (unpublished). Status of work for EnerKey project.         [ Links ]

IER (Institut for Energy Economics and the Rational Use of Energy), University of Stuttgart, 2011 (unpublished). Status of work for EnerKey project.         [ Links ]

Ijumba, K.P, Sebitosi, A.B. and Pillay, P, (2007). Modelling the impact of solar water heaters on the reduction of residential electricity consumption. Cape Town: Department of Electrical Engineering, University of Cape Town.         [ Links ]

ITS Solar (2009). Solar Water Heating Specialists. Available at: http://www.its-solar.com/price/ (Accessed July 2009).         [ Links ]

Jacobs, et al., (2004). Application of a residential end-use model for estimating cold and hot water demand, wastewater flow and salinity. Water SA, 30(3), pp.305-316.         [ Links ]

Kalogirou, S.A., (2004). Environmental benefits of domestic solar energy systems. Energy Conversion and Management, 45(18-19), pp.3075-3092.         [ Links ]

Kaltschmitt, M., (1990). Möglichkeiten und Grenzen einer Stromerzeugung aus Windkraft und Solarstrahlung am Beispiel Baden-Württemberg. Stuttgart.         [ Links ]

Karekezi, S., (2002). Renewables in Africa - meeting the energy needs of the poor. Energy Policy, 30(11-12), pp.1059-1069.         [ Links ]

Lloyd, P., (2009). Developing safe paraffin appliances in South Africa. Boiling point, 56, pp.7-9.         [ Links ]

Mercer, D., (2008). City of Johannesburg State of Energy Report 2008. Braamfontein: CoJ Environmental Management Department. Available at: http://www.cityenergy.org.za/files/resources/soe/CoJStateEnergyReport.pdf (Accessed Nov 2009).         [ Links ]

Meyer, J.P. and Tshimankinda, M., (1997a). Domestic Hot-Water Consumption by South African Houses for Developed and Developing Communities. International Journal of Energy Research, 21. pp.667-673.         [ Links ]

Meyer, J.P. and Tshimankinda, M., (1997b). Domestic Hot-Water Consumption by South African developing Communities Living in Shacks. International Journal of Energy Research, 21, pp.1081-1086.         [ Links ]

Meyer, J.P., (2009). Prof. Joshua P. Meyer, School of Engineering, Department of Mechanical and Aeronautical Engineering, University of Pretoria, Expert in domestic hot water consumption, E-mail correspondence (Josua.Meyer@up.ac.za) on 25 November 2009.         [ Links ]

Mncube, D.W., (2006). Household Survey on Energy Consumption patterns in Johannesburg Townships -A case Study of Diepkloof, Soweto. Johannesburg , University of Witwatersrand.         [ Links ]

NER (2001). Electricity supply statistics for South Africa 2001. National Electricity Regulator, Pretoria.         [ Links ]

NERSA, (2010). Nersa's Decision on Eskom's Required Revenue Application - Multi-Year Price Determination 2010/11 to 2012/13. Media Statement, 24 February 2010.         [ Links ]

Oorja (2009). Oorja Solutions Gas Geyser and Water Purifier Efficiency. Available at: http://www.oorjasolution.com/gas_geyser.html (Accessed July 2009).         [ Links ]

Özdemir, E.D., Marathe, S.D., Tomaschek J. and Eltrop, L., (2009). Role of Solar Water Heaters in Gauteng Province, South Africa. In: ISES (The International Solar Energy Society), ISES Solar World Congress 2009, Johannesburg, South Africa, 2009.         [ Links ]

Paidipati, J., Frantzis, L., Sawyer, H. and Kurrasch, A., (2008). Rooftop Photovoltaics Market Penetration Scenarios. Subcontract Report NREL/SR-581-42306. National Renewable Energy Laboratory.         [ Links ]

Sabinet (2008). DME planning to make LPG more affordable. Available at: http://www.sabinet.co.za/sabinet-law/news_paZAR609.html (Accessed Nov 2009).         [ Links ]

SAPIA, (2009). Product Prices SAPIA - Illuminating Paraffin Price. Available at: http://www.sapia.co.za/stats/parafin.htm [Accessed Nov 2009].         [ Links ]

SESSA and Eskom (2008). Residential Hot Water Energy Project - Quantification of Benefits. Final Data Analysis.         [ Links ]

Shell (2009). Fuel Prices. Available at: http://www.shell.co.za/vpower/pprice.htm (Accessed Nov 2009).         [ Links ]

Solar Heat (2009). Solar water heating products and services in Southern Africa - data sheets. Available at: http://www.solarheat.co.za/index_files/Pics/PBS/PRODUCT%20BROCHURES/Product%20Specs%20Giosol.pdf (Accessed July 2009).         [ Links ]

Sopian, K. et al., (2004). Performance of a non-metallic unglazed solar water heater with integrated storage system. Renewable Energy, 29(9) pp.1421-1430.         [ Links ]

Spalding-Fecher, R., (2003). Potential for Energy Efficiency Improvements in the Residential and Commercial Sector in South Africa - An Overview. In: Domestic Use of Energy Conference.         [ Links ]

StatsSA (2005a). P0100 - Income and expenditure of households 2005/2006: Statistical release. Available at: http://www.statssa.gov.za/Publications/P0100/P01002005.pdf (Accessed July, 2009).         [ Links ]

StatsSA (2005b). P0318 - General Household Survey. July 2005. Available at: http://www.statssa.gov.za/publications/P0318/P0318July2005.pdf (Accessed July, 2009).         [ Links ]

StatsSA (2007). Community Survey Basic Results: Municipalities March 2008. Available at: http://www.statssa.gov.za/publications/P03011/P030112007.pdf (Accessed July, 2009).         [ Links ]

StatsSA (2009). Electricity Consumption Data. Available at: http://www.statssa.gov.za/timeseriesdata/t_series_data/excell/Electricity%20generated%20and%20available%20for%20distribution%20(200911).zip (Accessed July, 2009).         [ Links ]

StatsSA, 2010. Consumer Price Index (CPI). Available at: http://www.statssa.gov.za/cpi/index.asp (Accessed July, 2009).         [ Links ]

Stiebel Eltron (2009). Stiebel Eltron S.A. Agencies PTY Price List, 29 June 2009.         [ Links ]

TEA (2006). A Low-income Energy Efficiency Program: Mapping the Sector and Program Design Principles -A report prepared by the Toronto Environmental Alliance for the Ontario Power Authority's Conservation Bureau. Toronto Environmental Alliance. Available at: http://www.powerauthority.on.ca/Storage67/6264_TEA_report.pdf (Accessed July 2010).         [ Links ]

Theron, S., FHES, (2009). Flying Hippo Energy Solutions heat pump provider. (Personal communication, June 2009).         [ Links ]

Thorne, S., (1996). Financial costs of household energy services in four South African cities.         [ Links ]

Tomaschek, J. Dobbins, A. Özdemir, E. D. and Fahl, U., (2009). Analysis of Incentives Using an Energy System Model for Solar Water Heater Installation in Gauteng Megacity Region, South Africa. In: ISES (The International Solar Energy Society), ISES Solar World Congress 2009. Johannesburg, South Africa, 2009.         [ Links ]

Truran, G., (2009). Household energy poverty and paraffin consumption in South Africa, Boiling Point,         [ Links ] [online] Available at: http://www.hedon.info/docs/BP56_Truran.pdf (Accessed July 2010).

Tshwane (2005). City of Tshwane Metropolitan Municipality State of Energy Report. City of Tshwane. Available at: http://www.cityenergy.org.za/files/resources/soe/CTMMSOE.pdf (Accessed July 2010).         [ Links ]

Tshwane (2008). Tariffs and Retail Sales. Available at: http://www.tshwane.gov.za/documents/tariffs/elec_summary_Sep2008.pdf (Accessed Nov 2009).         [ Links ]

University of Johannesburg (2009). A study of domestic paraffin stove design factors in South Africa. Chapter 5 [online] The University of Johannesburg.         [ Links ] Available at: hdl.handle.nel/10210/2560, (Accessed July 2009).

UNISOL (2009). Hot Water Solutions. Heat exchanger efficiency. Available at: http://www.unisolsolar.com/hotwater.htm (Accessed July 2009).         [ Links ]

Von Ketelhodt, A. and Wöcke, A. (2008). The impact of electricity crises on the consumption behaviour of small and medium enterprises, Journal of Energy in Southern Africa. Available at: http://www.erc.uct.ac.za/jesa/volume19/19-1jesa-vonketelhodt.pdf. (Accessed November 2011).         [ Links ]

WaterLite, (2009). Solar Water Heaters - data sheets. Available at: http://www.waterlite.co.za/ (Accessed July 2009).         [ Links ]

Winkler, H., Spalding-Fecher, R., Tyani, L. and Matibe, K., (2002). Cost-benefit analysis of energy efficiency in urban low-cost housing. Development Southern Africa Vol. 19, No. 5.         [ Links ]

 

 

Received 1 October 2010
Revised 25 November 2011

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