| Popis: |
In this study, the actual energy consumption of the secondary side of District Heating System (DHS) with differenthot water supply temperature control methods are compared. Three methods are Set-point Control, Outdoor TemperatureReset Control and Outdoor Temperature Prediction Control. While Outdoor Temperature Reset Control has been widely usedfor energy savings of the secondary side of the system, the results show that Outdoor Temperature Prediction Control methodsaves more energy. In general, Outdoor Temperature Prediction Control method lowers the supply temperature of hot water,and it reduces standby losses and increases overall heat transfer value of heated spaces due to more flow into the space.During actual energy consumption monitoring, Outdoor Temperature Prediction Control method saves about 7.1% in comparison to Outdoor Temperature Reset Control method and about 15.7% in comparison to Set-point Control method.Also, it is found that at when partial load condition, such as daytime, the fluctuation of hot water supply temperature with Set-point Control is more severe than Outdoor Temperature Prediction Control. Therefore, it proves that Outdoor Temperature Prediction Control is more stable even at the partial load conditions. |
