Operation strategies to achieve low supply and return temperature in district heating system

The system suggests using a heat exchanger (HX3) at a 90°C set point temperature to recover thermal energy from the branched out district heating supply water stream.. This results

Figure 3 shows the radiator supply and return temperatures for the as-built versions of AB_03 for the two different dimensioning temperature levels: 80/60 ◦ C (red) and 60/40 ◦ C