HP & Boiler - Serial - HP on/off control
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Working principle
The heat pump has a serial configuration with the boiler. More information about the different configuration possibilities can be found in Hybrid production Heating https://hysopt.atlassian.net/wiki/spaces/HRM/pages/3089204289.
The boiler is activated when the flow temperature of the system drops under 68°C, and deactivated when the flow temperature rises over 72°C. The activation also includes a check for the minimal flow rate, if the flow rate through the system is insufficient, the boiler won’t be activated. For instance, if the installation is shut down, the temperatures in the pipes will drop but the boiler won’t be activated because there is no flow through the system. If the boiler is activated a 3-way valve will be opened, meaning all the flow will go through the boiler, if the boiler is deactivated the 3-way valve will be closed, bypassing the boiler.
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The working principle of the HP control is explained in HP on/off Basic control strategies.
A Ground Source Heat Pump (GSHP) is used in this template, but an Air Source Heat Pump (ASHP) can also be used, this is further explained in Heat pump.in https://hysopt.atlassian.net/wiki/spaces/HRM/pages/3089204173.
Parameters to change in order to use this model correctly
These parameters are similar compared to the prescribed parameters in the parallel configuration with on/off-controlHP & Boiler - Parallel configuration. The only thing that changes is the hydraulic connection of the heat pump to the boiler. For the series configuration, the same principles apply for the design of the heat flows. For more information, see https://hysopt.atlassian.net/wiki/spaces/HRM/pages/3089204435/Serial
Notices/Remarks
The user should lock the nominal thermal power and temperatures of the HP. If not, the software will calculate with the propagated power and return temperature from the installation.
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More information about the HP and boiler can be found in Heat pump and Condensing boiler https://hysopt.atlassian.net/wiki/spaces/HRM/pages/3089204173 and https://hysopt.atlassian.net/wiki/spaces/HRM/pages/3089203976.
HP & Boiler - Serial - HP modulation
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This template is a combination of the previous template “HP & Boiler - Serial - HP on/off control” and the template HP Heat Pump modulation.
The modulating control of the HP can easily be changed to a stage control by replacing the heat pump part with the template HP stages Heat Pump stages.
Parameters to change in order to use this model correctly
These parameters are similar compared to the prescribed parameters in the parallel configuration with on/off-controlHP & Boiler - Parallel configuration.