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Improving the district heating operation by innovative layout and control strategy of the hot water storage tank
Energy and Buildings ( IF 6.7 ) Pub Date : 2020-07-04 , DOI: 10.1016/j.enbuild.2020.110273
Xiaochen Yang , Svend Svendsen

In the district heating (DH) systems, the thermal storage tank is widely used for domestic hot water (DHW) preparation to shave the peak load. Compared to the space heating, the domestic hot water demand exists for all seasons, and the variation of which is more dramatic within short time span. Therefore, the well-controlled storage tank is of great help to stabilize the district heating operation and to improve the overall performance. This study develops an innovative control strategy of the local DHW tank with the heat delivered by DH. According to the dynamic DHW load profile, the controller can switch to the corresponding charging mode to obtain the optimal performance without violating any requirements. A smart-metered multi-storey building in Denmark is selected as the reference case for DHW loop renovation. The proposed control strategy is applied in two new system layouts with the external heat exchanger and the micro heat pump by numerical models. The stratifications of the storage tank, the stability of the DH operation, and the DH return temperatures of the three scenarios are investigated as the key performances. The results show that, to cover the same DHW demand, the total energy consumption of the three scenarios show little difference. However, the proposed charging method of the DHW tank can limit the peak load for DH. Moreover, the resulting DH return temperature can be lowered by 4.9–16.4 °C and the DH water flow can be saved by 8%–28% compared to the reference case.



中文翻译:

通过创新的储热水箱布局和控制策略改善区域供热运行

在区域供热(DH)系统中,蓄热箱广泛用于生活热水(DHW)的制备,以减少峰值负荷。与空间供暖相比,所有季节都存在家用热水需求,并且其变化在短时间内更为显着。因此,良好控制的储罐对稳定区域供热运行和改善整体性能有很大帮助。这项研究利用DH提供的热量开发了一种本地DHW储罐的创新控制策略。根据动态DHW负载配置文件,控制器可以切换到相应的充电模式以获得最佳性能,而不会违反任何要求。丹麦一栋智能计测的多层建筑被选作DHW环路改造的参考案例。所提出的控制策略通过数值模型应用于外部热交换器和微型热泵的两个新系统布局中。研究了三种情况下储罐的分层,DH操作的稳定性和DH返回温度作为关键性能。结果表明,在满足相同的DHW需求的情况下,这三种方案的总能耗几乎没有差异。但是,建议的DHW储罐充电方法会限制DH的峰值负荷。此外,与参考案例相比,所得到的DH回水温度可以降低4.9–16.4°C,并且DH水流量可以节省8%–28%。DH操作的稳定性以及这三种情况下的DH返回温度作为关键性能进行了研究。结果表明,在满足相同的DHW需求的情况下,这三种方案的总能耗几乎没有差异。但是,建议的DHW储罐充电方法会限制DH的峰值负荷。此外,与参考案例相比,所得到的DH回水温度可以降低4.9–16.4°C,并且DH水流量可以节省8%–28%。DH操作的稳定性以及这三种情况下的DH返回温度作为关键性能进行了研究。结果表明,在满足相同的DHW需求的情况下,这三种方案的总能耗几乎没有差异。但是,建议的DHW储罐充电方法会限制DH的峰值负荷。此外,与参考案例相比,所得到的DH回水温度可以降低4.9–16.4°C,并且DH水流量可以节省8%–28%。

更新日期:2020-07-13
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