Air Source Heat Pump (ASHP) - HP on/off control
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Working principle
The heat pump is an air source heat pump, which means the evaporator side extracts the heat from the ambient air.
The heat pump and pump are activated if the upper temperature of the storage tank is lower than 45°C, and are deactivated if the lower temperature of the storage tank is higher than 50°C.
A PI-controller (with a blue minus icon) will make sure the minimal return temperature required, 30°C in this case, is met by controlling the 3-way modulation valve.
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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When using a thermal energy storage vessel, the user should lock the temperature regime of the heat pump. 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.
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There are default COP and power tables for the heat pump, but these can be changed by the user.
The user can change the design temperatures, thermal power, end units, etc. But keep in mind that the controls have to be changed as well. This can be done by changing the setpoint values.
If the user changes the power of the end-units, the thermal capacity of the heat pump doesn’t change automatically. The user should implement a correct condenser capacity corresponded with the thermal power of the condenser.
More information about the HP can be found in Heat pump.
Ground Source Heat Pump (GSHP) - HP on/off control
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Idem as the previous template, except this is a Ground Source Heat Pump (GSHP) instead of an Air Source Heat Pump (ASHP). The difference is specified in Heat pump.The basic control strategies for heat pumps come in 3 different variations, which allow for different styles of control, depending on the actual heat pump installation.