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GENERATING FREE ENERGY DURING THE DHW WATER PRODUCTION
Abstract
Solar thermal energy is a widely established source for Domestic Hot Water (DHW) production. However, standard DHW systems rely on external electrical energy to power auxiliary components such as circulation pumps and automation controls. This paper aims to demonstrate the feasibility of a self-sustaining system capable of simultaneous thermal energy recovery and electrical generation, thereby enhancing overall energy efficiency and reducing the carbon footprint. Experimental investigations were conducted on a custom-built heat exchanger integrating commercial Peltier modules and aluminum water blocks, utilizing an electric instant water heater to simulate the heat source. The electrical generation potential was evaluated using a 12V DC fan as a representative load. Preliminary measurements indicated that a single thermoelectric module generates an open-circuit voltage of approximately 1.327V under the tested conditions. Consequently, a series configuration of 10 modules proved sufficient to activate and sustain the fan's operation. Furthermore, an expanded array of 20 modules resulted in a voltage output exceeding 13 V, driving the load above its nominal speed. These results validate the potential of integrating thermoelectric technology into DHW systems to offset auxiliary electrical consumption.
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