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International Journal of Photoenergy - Volume 2017 2017, Article ID 7540250, 10 pages -

Research Article

Faculty of Mechanical Engineering, Czech Technical University, Technicka 4, 166 07 Prague 6, Czech Republic

University Centre of Energy Efficient Buildings, Czech Technical University, Trinecka 1024, 273 43 Bustehrad, Czech Republic

Correspondence should be addressed to Tomas Matuska

Received 10 February 2017; Revised 29 March 2017; Accepted 13 April 2017; Published 16 May 2017

Academic Editor: Stoian Petrescu

Copyright © 2017 Tomas Matuska and Borivoj Sourek. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Performance of solar photovoltaic water heating systems with direct coupling of PV array to DC resistive heating elements has been studied and compared with solar photothermal systems. An analysis of optimum fixed load resistance for different climate conditions has been performed for simple PV heating systems. The optimum value of the fixed load resistance depends on the climate, especially on annual solar irradiation level. Use of maximum power point tracking compared to fixed optimized load resistance increases the annual yield by 20 to 35%. While total annual efficiency of the PV water heating systems in Europe ranges from 10% for PV systems without MPP tracking up to 15% for system with advanced MPP trackers, the efficiency of solar photothermal system for identical hot water load and climate conditions is more than 3 times higher.

Autor: Tomas Matuska and Borivoj Sourek



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