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The authors have been exploiting a hybrid energy supply for a hotel building since 1999. The
cooperating sources are: solar energy, geothermal system and power mains supply. The basic
task for this composition is to provide hot water. The system is composed of solar thermal flat
plate collectors, heat-pipe vacuum collectors, a heat pump with a ground heat supply
and a thermal accumulation system of water tanks aided by electric heating. The cooperation
among various renewable energy sources is connected with the need to extend the systems
with conversion devices and, even at first, with the need to accumulate the surplus of energy
gain. It is important to optimise the fluxes of generated power and load in the way to
distinctly reach energy savings in traditional energy carriers and energy efficiency of the
whole solution.
The control software has the tasks: to measure control values, to analyze their dynamics of
changes and to work out correct setup signals. Nowadays, these possibilities have remotely
scattered automatics based on PLC controllers. This way an intelligent local network can be
created to provide energy needs for e.g. a hotel and at greater size, for a district or even for
a village.There is fully automatic monitoring and control based on PLC type S-7-300. The
variety of algorithms have been tested to enable this system to work as a local smart grid and
to select optimal parameters adjusted for current ambient conditions and thermal load. The
adaptation control system has been used to allow for particular element diagnostics too. The
described thermal energy supply system undergoes now exploitation tests after the
modernization. Different control algorithms are tested but each test requires the whole year of
operation, so the results are still expected.
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