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It was the most important aim of this new development, to eliminate or minimize some aspects that have negative impacts on the quality of the GRT (e.g. Reuß et al. 2001) by using a programmable logic controller (PLC):
Compensation of short-term and long-term fluctuations of the grid by programmable logic controlling of the heating operation and, thus, maintaining a constant heat input to the geothermal probe during heat supply. By measuring the controlled variable temperature directly the flow and backflow resp. inside the geothermal probe, no out temperature impacts my affect on the measuring unit or the measuring results, as outer heat inlets or heat losses inside the system are compensated by the PLC. By avoiding outer heat inlets or heat losses, balance differences (heat) or evaluation mistakes can be avoided or minimized.
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A Programmable Logic Controller (PLC) is an electronic group of components implemented in automation technology for control tasks.
Due to an optimisation of concept and quality of PLC-controlled measurements, the adaptation of parameters has been improved by further reduction of the "objective function". Comparative measurements of the GRT unit with and without PLC verify this observation.
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