Proposal and simulation of control system for solar domestic water heating with drain-back

Solar domestic hot water heating is currently desired and widespread way of using clean energy sources in the Slovak Republic. Control of solar domestic hot water heating systems is often solved trivially and does not address the safety and efficiency. System with drain-back tank and solar collectors with evacuated tubes is an advanced solution meeting the requirement of autonomous safety, environmental friendliness and efficiency of operation. It addresses possible emergencies occurring in other types of solar systems and allows system regeneration to the operating state without operator's intervention. At the same time this system brings its own set of issues with control and its quality requirements.