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Analysis of a heat pump assisted solar water heating system using TRNSYS program

Traditional solar hot water system (SDHW) is an important system for the use of renewable energy sources. In this system, while water is heated by sun in summer or hot days, it is heated by electric heaters in winter, or cold days. So efficiency of this system is low in winter because of very high electric consumption. This problem can be solved using heat pump instead of electric heaters. In this study, a heat pump assisted solar domestic hot water system (HP_SDHW) was designed to increase efficiency. Both systems were modelled and simulated depending on time using (TRNSYS) program. An analysis was performed through the year for both systems at SARAJEVO/Bosnia and Herzegovina conditions. As a result of the annual analysis, it was found that the HP_SDHW system consumes approximately 40% less electricity than the traditional SDHW system. The solar fraction of the HP_SDHW (%67) was found higher than the SDHW system (%46).