Figure 2
The schematic presents a horizontal system layout with interconnected components and dashed control boundaries. On the top left, a globe icon labeled “Weather -2” connected by a dashed line to two tilted panel icons labeled “3 kilowatts underscore P V” and “7 kilowatts underscore P V”. Solid lines from “3 kilowatts underscore P V” and “7 kilowatts underscore P V” merge into a line leading to a small rectangular block labeled “P V gen underscore sum”. A line from “P V gen underscore sum” extends right to a rectangular block labeled “Battery”. Below “Battery”, a rectangular block labeled “Inverter” is connected with a bidirectional arrows between “Battery” and “Inverter”. A rectangular block labeled “Threshold” connected by a dashed lines to the vertical line between “P V gen underscore sum” and “Inverter”. A rectangular block labeled “Total underscore power” sits below the “Inverter” connection and links downward into the thermal system. On the right side, a dashed vertical boundary separates outputs. At the top right, a small printer icon labeled “Monthly underscore power underscore output” is connected by a dashed line from the upper electrical line. Below it, a rectangular block labeled “Heating element underscore rated underscore power” is connected by a dashed line to the main vertical line. Further down, a rectangular block labeled “Electrical underscore load” is connected to the main electrical line. Below it, a rectangular block labeled “D H W underscore load” is connected to a lower horizontal line. At the bottom right, a printer icon labeled “Hourly temperature and power underscore output” is connected by a dashed line from the lower thermal line. On the lower left, a globe icon labeled “Weather” is connected to a rectangular block labeled “Heat underscore pump”. A solid line from “Heat underscore pump” leads right to a circular pump symbol labeled “Water underscore pump”. A solid line continues to a vertical cylindrical tank labeled “Water underscore storage underscore tank”. A dashed rectangular boundaries enclose two control sections. The left dashed box contains a rectangular block labeled “Heat pump control” connected by a dashed lines to “Heat underscore pump” and “Water underscore pump”. The right dashed box contains a rectangular block labeled “Heating element control” connected by a dashed lines to the vertical line near “Total underscore power” and to the lower thermal line near “Water underscore storage underscore tank”. Solid and dashed arrows show flow directions between all labeled components across the diagram.TRNSYS modelling of the PV-driven heat pump with energy storage for electricity and DHW supply. Source: Authors' own work