The ‘Combined Heat and Power’ template consists of CHP combined with a storage tank and a basic control strategy.
CHP - Basic control
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Working principle
The programmable controller controls the CHP. It gives the setpoint to the external PI-controller for controlling the 3-way valve to achieve a certain return temperature. Internally it will enable or disable the CHP and it will calculate the modulation based on the measured return temperature (see figure below).
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If the measured return temperature is greater than the maximum return temperature during a specific time, the CHP 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%
Notices/Remarks
The user should lock the nominal thermal power and return temperature of the CHP. If not, the software will calculate with the propagated power and return temperature from the installation.
When using a thermal store, the user should lock the temperature regime of the CHP. If not, the software will calculate with the propagated power and return temperature from the installation. The locked temperature regime is visualised in the figure below.
It is possible to upload electrical and thermal efficiency tables, by clicking on the pencil icon. The user can download an example file by clicking on the grey arrow icon. After adjusting this file, the user can upload it back to the CHP by clicking on the blue arrow icon.
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More information about the CHP can be found in CHP (Combined Heat & Power).