摘要
建立了供热空调系统中变频水泵扬程、效率和功率与流量和转速间的关联模型．结合并联水泵的运行特性，以最佳点工作流量与水泵转速比范围为参考，理论分析了对应并联变频水泵电耗极小值运行工况下各水泵转速比配置情况．以采取变压差设定值控制的某交流量空调水系统并联水泵运行工况为算例，仿真研究了一台水泵全速运行、一台水泵变频运行，两台水泵同步变频运行且转速比相差0．05，两台水泵同步变频运行且转速比相差0．1与两台水泵同步变频运行且转速比相同4种控制方案的水泵节能效果．理论分析与仿真结果表明，并联水泵转速比的差异将导致一台水泵或多台水泵效率低下，当各水泵转速比相同时，并联水泵的总电耗最小．
Correlation model of head, efficiency and power in connection with flow and speed for variable speed pump in heating and air-conditioning system was built. According to the operation characteristics of parallel pumps, the optimal allocation situation of speed ratio of parallel pumps when total pump power attains its lowest level was theoretically analyzed with reference of flow of best efficiency point and speed ratio range. Based on a series of parallel pump operating conditions in a typical variable water flow air-conditiong system with variable differential pressure setpoint control, pump energy saving potential was evaluated by simulation under four control strategies, including one pump running at full speed and another pump running at variable speed, two pumps running at variable speed with 0.05 speed ratio difference, 0. 1 speed ratio difference and the same speed ratio, respectively. Theoretical analyses and simulation results show that the speed ratio difference leads to extremely low efficiency of one pump or several pumps. It is concluded that the operation strategy with parallel pump running at the same speed ratio is the optimal choice to attain maximum pump saving potential.
出处
《大连理工大学学报》
EI
CAS
CSCD
北大核心
2011年第5期701-706,共6页
Journal of Dalian University of Technology
基金
国家自然科学基金资助项目(51008042
51078053)
中国博士后科学基金面上资助项目(20100481235,20090461169)
中央高校基本科研业务费重大类研究型培育项目(DUT11zd105)
关键词
供热空调系统
并联水泵
变频
优化控制
heating and air-conditioning system
parallel pumps
variable speed
optimal control
