基于水力模型的建筑加压调蓄系统能耗评估及优化研究

Study on Energy Consumption Assessment and Optimization of Building Pressurized Storage System Based on Hydraulic Model

建筑加压调蓄系统的能耗在建筑能耗中占据较大比例,泵组优化及能耗控制已成为目前业内的研究焦点之一。该研究基于水力模型对上海市某养老院二~七层现状供水系统进行建模并校核,针对用水特性提出节能优化方案,并对不同供水模式中泵组运行能耗进行评估。研究结果表明,该养老院的现状变频泵选型过于保守,造成较大能源浪费;在单泵工况下,同型号变频泵比工频泵更为节能,而叠压供水设备与变频泵相比可节约67.8%的能耗;在双泵工况下,2台变频泵采用同频调速的方式能够有效控制能耗,其与变频泵+工频泵并联供水相比可节约9.1%的能耗,但仍然无法摆脱低流量下处于非高效区运行的影响;而采用变频大泵与工频小泵组合的供水方式可以有效利用工频小泵过渡低效区,其与全变频相比可节约18.4%的能耗。但在实际双泵运行工况下,需要根据泵房的自控系统条件折中选择供水模式。

The energy consumption of building pressurized storage system occupies a large proportion in building energy consumption,and pumping unit optimization and energy consumption control have become one of the research focuses in the industry.Based on hydraulic model,the current situation on the water supply system from the second to seventh floors of a nursing home building in Shanghai was modeled and checked.According to the water consumption characteristics,energy-saving optimization schemes were proposed and the energy consumption of pumping unit operation was evaluated in different water supply modes.The results show that the current frequency conversion pump selection of the nursing home is too conservative,resulting in a large energy waste;Under the single pump condition,the same type of variable frequency pump is more energy efficient than the power frequency pump,and the stacking equipment can save 67.8%of the energy consumption compared with the operation of the variable frequency pump.Under the double-pump condition,two frequency conversion pumps with the same frequency speed control can effectively control energy consumption.Compared with the parallel water supply of operating energy,its frequency conversion pumps and power frequency pumps,it savings energy consumption by 9.1%,but it still can’t get rid of the effect in a low-flow non-efficient area;However,the use of frequency conversion pumps and power frequency small pumps combination of water supply can be effectively utilized power frequency small pumps transition inefficient area.Compared with the full frequency conversion,its energy consumption saved by 18.4%.However,under the actual double-pump operation conditions,it is necessary to choose the water supply mode according to the pump room’s automatic control system conditions compromise.