A Microcontroller-based Solar Hot Water System Design

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Kerekes Sándor
Department of Automation and Applied Informatics

The solar power energy is one of the most popular renewable energy sources, which can be used in everyday households too. This project is about to design a solar thermal system for an existing house for my family. The system compliments the gas hot water system already in the house. The house has 4 apartments and the past hot water consumption should be taken into account by the design.

The design includes the solar panels, the expansion tank, the tubes, the microcontroller, the motor, the safety valves, the sensors, the water tank. The phenomena like the stagnation period are explained and how to counter its damaging effects. There are words about the differences between the flat plate and evacuated tube collectors, the different connection possibilities of the collector fields. The importance of safety measures are well emphasized too. The heat transfer fluid shouldn’t be water, but some antifreeze-water mixture. Simulations were run to ensure the collector provides enough heat for the water tank.

A cost approximation was done too, because this thermal solar system is meant to be built in the future.


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