一次泵定流量系统旁通控制模拟与分析

Simulation and Analysis of Bypass Control in a Primary-pumping Water System

本文分析了空调一次泵定流量系统旁通控制的方法及特点,并根据某空调水系统实际布置与配置,搭建模拟平台,进行水系统管网模拟,比较分析了压差旁通控制和最小流量旁通控制的控制效果。结果表明,在一次泵定流量系统中,采用压差旁通控制能够维持系统流量恒定并满足制冷机蒸发器最低流量的需求,此时制冷机组的流量很大。当系统采用最小流量旁通控制时,可以达到对于系统流量精确控制的目的并满足制冷机蒸发器最低流量要求。在定流量空调水系统中,无论是压差旁通控制还是最小流量控制都存在大量的流量及水泵能耗浪费,应采用变速调节措施提高系统能效。

This paper analyzes the method and characteristics of the bypass control of a primary-pumping water system with constant speed. The simulation platform of a real primary-pumping water system was developed according to its actual arrangement and configuration, The characteristics of the water system pipe network were simulated with the differential pressure bypass control and the minimum flow bypass control. The results show that the differential pressure bypass control for the primary-pumping water system may maintain constant flow and meets the minimum flow demand for the chiller evaporator. However, the flow is much larger than the rated flow. When the minimum flow bypass control is used, the system flow can be controlled precisely, and the minimum flow demand is met. However, much energy is consumed in the primary-pumping water system wifia constant speed whether differential pressure bypass control is used or minimum flow bypass control is used. Variable speed measures should be used for improving energy efficiency.