供暖空调水系统定压差控制模式定量分析
Quantitative analysis of constant pressure difference control mode in heating and air conditioning water systems
摘要：
基于管网动力学数学模型，定量分析了供暖空调水系统定压差控制方法对各用户资用压头和循环水泵运行工况的影响。结果表明，在定压差控制模式下，远离定压差点的用户均需设置动态压差控制设施，以保证用户调节阀的有效性。对实例工程进行分析发现，冷、热水变频循环泵采用末端定压差控制+台数控制方法，相比工频运行+台数控制方法，供冷、供热工况下可分别减少水泵能耗42.9%，45.7%，具有较好的节能效益。
Abstract：
Based on the mathematical model of pipe network dynamics, quantitatively analyses the influence of the water system constant pressure difference control method on users’ available differential pressure and circulating pump operating conditions. The results show that in the constant pressure difference control mode, the users who are far away from the constant pressure difference point need to set dynamic pressure difference control devices to ensure the effectiveness of the user regulating valve. The analysis of an example project indicates that the control method of the cold and hot water frequency conversion circulating pumps controlled by end constant pressure difference and unit numbers, compared to the control method of constant speed operation and unit numbers, can reduce the pump energy consumption by 42.9% and 45.7% respectively under cooling and heating conditions, which has good energy saving benefits.
Keywords:variable flow rate, constant pressure difference control, variable speed pump, pump efficiency, water system, available differential pressure