Potential of Photovoltaics for Water Heating in South Africa

  • Ognyan Dintchev Tshwane University of Technology, Pretoria, South Africa
  • G.S. Donev Tshwane University of Technology, Pretoria, South Africa
  • J.L. Munda Tshwane University of Technology, Pretoria, South Africa
  • Tshwane University of Technology, Pretoria, South Africa
  • M.M. Wesigye Tshwane University of Technology, Pretoria, South Africa
  • S. Worthmann Real Time Energy (Pty) Ltd
Keywords: Photovoltaics, Water Heating

Abstract

Electric water heating (EWH) is the most common technology used to heat water in residential and commercial buildings in the country of South Africa. Water heating typically accounts for roughly 40% of the energy consumption of a typical South African home. The high capital costs of solar thermal water heating (SWH) systems in South Africa have made implementation of this technology very expensive. Recent reductions in the costs of solar photovoltaic (PV) systems have made them economically competitive with conventional electrical systems. The relatively steady annual electrical generation output of the PV systems when compared with the seasonal performance of the conventional SWH has created opportunities for solar PV to capture a larger share of the local water heating market. This article reviews and assesses the three primary water heating technologies currently used in South Africa and provides an energy and financial analysis of each technology.

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Author Biographies

Ognyan Dintchev, Tshwane University of Technology, Pretoria, South Africa

Ognyan Dintchev is an Association of Energy Engineers (AEE) certified energy manager (CEM) and a certified measurement and verification professional (CMVP). He is a member of the Institution of Engineering and Technology (UK) and a registered engineer. He is as sociated with the Tshwane University of Technology (fUT), faculty of engineering and the built environment, Centre for Energy and Electric Power (CEEP). He and his measurement and verification (M&V) team are contracted by Eskom, South Africa's primary electricity generation utility. They were involved in measuring, quantifying and reporting the energy savings of more than 400 Eskom, energy saving and management projects in South Africa. E-mail: dintchev@icon.co.za or dintchevod@ tut.ac.za.

G.S. Donev, Tshwane University of Technology, Pretoria, South Africa

G.S. Donev is an AEE certified energy manager (CEM). He is a professional engineer with the engineering council of South Africa. He is associated with the Tshwane University of Technology (TUT), where he is a senior lecturer in the department of electrical engineering. He is actively involved in the TUT M&V Team and other energy management efficiency initiatives. Email: donevGS@tut.ac.za.

J.L. Munda, Tshwane University of Technology, Pretoria, South Africa

J.L. Munda is a professional engineer with the Engineering Council of South Africa. He is associated with the Tshwane University of Technology where he is an associate dean of postgraduate studies, research and innovation. He is a professor in the department of electrical engineering, faculty of engineering and the built environment. Email: MundaJL@tut.ac.za.

Tshwane University of Technology, Pretoria, South Africa

O.M. Popoola is a certified measurement and verification professional (CMVP). He is associated with the Tshwane University of Technology where he is a senior lecturer at the department of electrical engineering, faculty of engineering and the built environment. He is also director of the Centre for Energy and Electric Power. Email: popoolao@ tut.ac.za.

M.M. Wesigye, Tshwane University of Technology, Pretoria, South Africa

M.M. Wesigye is an AEE certified energy manager (CEM). He is associated with the Tshwane University of Technology (TUT), where he is an engineer at the Centre for Energy and Electric Power. He is actively involved in the TUT M&V Team and other energy management and efficiency initiatives. Email: jmmmantis@yahoo.com.

S. Worthmann, Real Time Energy (Pty) Ltd

S. Worthmann is an AEE certified energy manager (CEM) and a certified measurement and verification professional (CMVP). He is a professional engineer with the Engineering Council of South Africa. He is a director of Real Time Energy, Ltd., where he is involved in energy management and efficiency projects in South Africa and elsewhere. Email: shaun@rtenergy.co.za.

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