The ‘Biomass boiler’ template consists of a biomass boiler combined with a storage tank and a basic control strategy.
Biomass boiler - Basic control
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Working principle
The programmable controller controls the biomass boiler. It gives the setpoint to the external PI-controller for controlling the 3-way valve on the setpoint return temperature. Internally it will enable or disable the biomass boiler and it will calculate the modulation based on the measured return temperature (see figure below).
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If measured return temperature is greater than the maximum return temperature during a specific time the biomass boiler will be stopped.
Controls
The following settings can be changed by the user in the programmable controller:
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Return temperature < 70°C
=> 100%70°C < Return temperature < 75°C
=> between 100% and 60% depending on the return temperature, visualised in the figure below75°C < Return temperature
=> 60%
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Notices/Remarks
When using a thermal energy storage vessel, the user should lock the temperature regime of the biomass boiler, or else the software will continue with the propagated power and return temperature from the installation. The locked temperature regime is visualised in the figure below.
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