The templates consist of various configurations of a CHP combined with a boiler.
CHP & Boiler - Parallel
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Working principle
The programmable controller controls the CHP, visualised in the figure below. It gives the setpoint to the external PI-controller for controlling the 3-way valve on the desired return temperature. Internally it will enable or disable the CHP and it will calculate the modulation rate based on the measured return temperature.
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The boiler is activated when the flow temperature of the system drops below 73°C, and deactivated when the flow temperature increases above 77°C. The activation also includes a check for minimal flow rate, if the flow rate through the system is insufficient, the boiler won’t be activated. For instance, if the installation is disabled, the temperatures in the pipes will drop but the boiler won’t be activated because there is no flow through the system. During the activation of the boiler, an isolation valve at the boiler will open.
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Controls
More information about the controls of the CHP can be found in Combined Heat and Power (CHP) CHP - Basic Control.
Notices/Remarks
The system can be further optimised by doing sensitivity studies. For instance, a sensitivity study can be done for the size of the storage vessel or the thermal power of the CHP. To change the thermal power, the user should change the power spread found in the hybrid production configuration BC. More information about hybrid production configurations can be found in Hybrid production Heating.
The user should lock the nominal thermal power and return temperature of the CHP. If not, the software will assume the propagated power and return temperature from the installation.
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More information about the CHP and boiler can be found in CHP (Combined Heat & Power) and Condensing boiler Boilers.
CHP & Boiler - Reverse shunt in return
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Idem as the template “CHP & Boiler - Parallel”, except for the shunt configuration instead of the parallel configuration. There is also a bypass valve to bypass the boiler when the boiler is deactivated.
More information about hybrid production configurations can be found in Hybrid production Heating.
CHP & Boiler - Reverse shunt in supply
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Idem to the template “CHP & Boiler - Parallel”, except for the shunt configuration instead of the parallel configuration.
More information about hybrid production configurations can be found in Hybrid production Heating.
CHP & Boiler - Switchable serial in supply
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Similar to the template “CHP & Boiler - Parallel”, except for the serial configuration instead of the parallel configuration. There is also a bypass valve to bypass the boiler when the boiler is deactivated.
More information about hybrid production configurations can be found in Hybrid production Heating.
CHP & Boiler - Switchable serial in supply - Stirling motor
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Similar to the template “CHP & Boiler - Switchable serial in supply”, but in this template, a Stirling motor CHP is used. More information about the Stirling motor can be found in CHP (Combined Heat & Power). The controls for the Stirling CHP are also more basic than the traditional CHP, it will be activated and deactivated depending on the measured upper or lower temperature in the storage tank.
More information about hybrid production configurations can be found in Hybrid production Heating.
Boiler & CHP - Reverse shunt in supply
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Similar to the template “CHP & Boiler - Parallel”, except for the shunt configuration instead of the parallel configuration. There is also a bypass valve to bypass the boiler when the boiler is deactivated.
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