my Diploma Thesis: Remote-Monitoring and -Maintenance of Pumped Solar Thermal Systems

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EN ABSTRACT (the work is written in german!)

The present work deals with the remote-monitoring and -maintenance of pumped
solar thermal systems and was created in cooperation with TiSUN GmbH. Main
motivation is the problem that a failure or shortfall of a solar system is often not
noticed by the operator. The reason for this is the existing backup heater, which
takes over the water heating mostly automatically.

To keep the effort and additional costs for remote-monitoring and maintenance within
reasonable limits, the existing measurement- and control-technology of the solar
system has to be used. Therefore the status quo of customary temperature-, flow-,
pressure- and irradiation-sensors in solar systems is described. The solar controller
is the central gateway for sensor inputs, the operating data recording and
transmission of data to an external display. For remote maintenance, access to the
settings of the solar controller is required.

As a practical reference, three on the market available solar controllers are examined
regarding their suitability for remote-monitoring and -maintenance. It turns out that
the subject can be solved very differently: from simple data acquisition and
transmission with memory cards, via additional modules with web servers and
network connectivity, up to the data transfer to external web server or digital picture
W-LAN frames.

Furthermore the data analysis of solar systems for fault detection, control and
function optimization is outlined. Not all influencing factors are recorded digitally,
however it is shown that for only a few temperature profiles are enough for a rough
functional description of a plant. Finally an outlook on future developments of the
relatively new solutions for remote-monitoring and -maintenance of solar thermal
systems is given.
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