modelSplitter

Information

Basic functionality of the model

Splits a heating demand between a heat pump (HP) and an electric heater rod (HR) based on operating conditions, capacity limits, and minimum on/off time constraints for the HP.

HP enable conditions. The HP is allowed to operate only if all of the following hold:

• signal (system enable) is true.
• T_bufferTank is below T_HP_sup_max (supply temperature limit).
• Requested heat flow is above the HP turn‑on threshold Q_HP_min (with a small safety margin internally).
• T_amb is above T_HP_amb_min (ambient limit).
• The HP on/off state is managed by an internal OnOff latch that enforces t_onOff_minOn and t_onOff_minOff to prevent short cycling.

Load split. When enabled, the HP supplies up to its available capacity (from Q_HP_max input and limiter). Any remaining demand is routed to the HR.

HR logic. The HR is permitted when T_amb is below the bivalence threshold T_HP_bivalence and the system is enabled. Its output is limited to Q_HR_max and filtered by a first‑order lag before becoming Q_HR. The output Q_HR_available reports the currently available HR capacity given limits and the bivalence condition.

Outputs. The block provides the actual heat flows Q_HP and Q_HR, the HR availability Q_HR_available, and HP status flags HP_blocked, HP_blocked_on, and HP_blocked_off so supervisory control can observe capacity usage and lock states.

Source

Based on measurements and logic analysis during the ERIGrid 2.0 Project at SYSLAB @ DTU, Copenhagen.

Parameters

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