Influence of Fill Point in Multiple-Heat-Sources Looped District Heating System with Distributed Variable-Speed Pumps
- PDF / 1,751,760 Bytes
- 17 Pages / 595.22 x 842 pts (A4) Page_size
- 53 Downloads / 175 Views
https://doi.org/10.1007/s11630-020-1307-1
Article ID: 1003-2169(2020)00-0000-00
Influence of Fill Point in Multiple-Heat-Sources Looped District Heating System with Distributed Variable-Speed Pumps XU Tong1, YAN Jing1, WANG Xinlei1*, WANG Hai2, ZHU Tong2, WANG Haiying2* 1. Beijing Huajian Power Design and Research Institute, Beijing 101400, China 2. School of Mechanical Engineering, Tongji University, Shanghai 200092, China © Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract: When regulating a pipe network according to user demand, hydraulic balance and power consumption are crucial factors for a multi-source looped-pipe network applying distributed variable-speed pumps compared to the conventional central circulating pump system. In this paper, the influence of the fill point on power consumption and hydraulic balance of the multi-source looped-pipe network was studied. A mathematical model for electricity energy consumption analysis was built and calculated for a large sized looped-pipe network with multiple heat sources and distributed variable-speed pumps. The hydraulic calculation models of each single element, such as pipe, distribution pump, valve, replenishment pump, heat source and substation, were built. A case located in Dezhou city, China was analyzed. The results showed that: the maximum power saving (39.2%) could be achieved when each heat source had its own fill point, but the heat sources would not meet their design flows; to meet the design flows of all the heat sources, only one fill point should be necessarily located near the heat source with the lowest flow rate to get the expected hydraulic stability and energy saving.
Keywords: district heating, central circulating pump, distributed variable-speed pumps, fill point, energy saving
1. Introduction A district heating (DH) system can provide efficiency, environmental and economic benefits to the energy consumers. Interests in the pumping systems in the heat distribution networks have been growing in recent years, since the fluid handling systems are responsible for a significant part of total electrical energy use. A DH system typically uses the throttling valves [1] and/or the variable rotational speed pumps to deliver the desired discharge. Flow control by the balance valves and the throttling valves in a DH network with a conventional central circulating pump (CCCP) will waste energy of the circulating pump by throttling effect. While using the Received: Mar 15, 2019
distributed variable-speed pumps (DVSPs) to replace the throttling valves has the possibility to save energy, which was described in a number of reports and studies [2‒10]. Sarbu et al. [1] performed a comparative energy analysis on the hot water discharge adjustment using throttling valves and variable-speed drives in a district heating station. Jiang [3] discussed the technical feasibility of replacing throttling valves with variable-speed pumps. Wang et al. [4] studied the optimal configuration
Data Loading...
