Energy Consumption of Secondary Water Supply System in Typical Old Residential Quarters in Shanghai under the Background of "Double Carbon"
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摘要: 通过对上海典型老旧居民小区的多层建筑和高层建筑供水系统进行研究，对比分析了二次供水水泵在不同工况下的水量、能耗及效率方面的差异。结果表明，由于水池+变频水泵模式下水泵一天内主要时段的供水水量远低于额定流量，因此在满足相同供水需求时，水池+变频水泵模式下水泵的运行效率是水池+工频水泵+屋顶水箱模式下水泵运行效率的50%左右。部分水箱存在因位置距离顶楼过近，仅凭重力流无法满足供水压力需求的情况，水池+工频水泵+屋顶水箱模式需要再次加压，屋顶水泵再次加压的能耗约为泵房变频水泵能耗的200%以上，水池+变频水泵模式下总体能耗更低。Abstract: Taking the water supply of mid-rise buildings and high-rise buildings in typical old residential areas in Shanghai as the research object, this paper analyzes and compares the water flow, energy consumption and efficiency of secondary water supply pumps under different working conditions. The water supply flow in the main period of the day in the cistern+variable frequency pump mode is much lower than the rated flow, therefore, under the condition of meeting the same water supply target, the operating efficiency of the cistern+variable frequency pump is about 50% of that in the cistern+main frequency pump+water tank mode. However, some water tanks are too close to the top floor residents to meet the water supply pressure demand only by gravity flow. The cistern+main frequency pump+water tank mode needs to be repressurized, and the repressurization energy consumption of the roof water pump is about 200% of the energy consumption of the variable frequency pump in the pump station. At this time, the energy consumption of the cistern+variable frequency pump mode is lower.
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Key words:
- secondary water supply /
- carbon neutrality /
- carbon emission peak /
- pump energy consumption /
- water flow
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图 1 A、B小区供水模式示意图
Figure 1. Schematic diagram of water supply mode in community A and B
图 2 A、B小区月度每户日均用水量情况
Figure 2. Monthly average daily water consumption of each room in community A and B
图 3 2021年7月1日A、B小区多层区域泵房供水流量的时间占比情况
Figure 3. Time proportion of different water supply flow of pump stations in mid-rise community A and B on July 1, 2021
图 4 2021年7月1日A、B小区多层泵房水泵运行水量及机组运行效率变化
Figure 4. Changes of pump operating water flow and operating efficiency of pump stations in mid-rise community A and B on July 1, 2021
图 5 A、B多层泵房水泵机组运行效率随运行水量变化情况
Figure 5. Variation of pump operating efficiency with operating water volume of pump stations in mid-rise building of community A and B
图 6 A小区高层泵房水泵机组运行效率和运行水量变化
Figure 6. Changes of pump operating efficiency and operating water volume of pump station in high-rise building of community A
图 8 A、B小区泵房水泵与屋顶水泵日均能耗情况
Figure 8. Daily average energy consumption of pump stations and roof pumps in community A and B
表 1 A、B两小区水泵参数情况
Table 1. Water pump parameters of community A and B
Water supply zone Number of households Number of buildings Pump of station parameters Roof pump parameters High-rise building of community A 180 1 Q=20.5 m3/h, H=64.5 m, N=5.5 kW — Mid-rise building of community A 204 11 Q=20.5 m3/h, H=47.9 m, N=4.0 kW Q=3 m3/h, H=27 m, N=0.55 kW Mid-rise building of community B 392 18 Q=36 m3/h, H=43.1 m, N=7.5 kW Q=3 m3/h, H=27 m, N=0.55 kW 
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