分布式变频泵集中供热系统动态能量特性模拟

Simulation of dynamic energy performance of central heating system with distributed variable speed pump

在分析了分布式变频集中供热系统的节能特性和负荷特征的基础上,建立了分布式变频集中供热系统的能量数学模型并针对一公共建筑群的分时供热运行策略进行了模拟计算,模拟结果表明:分布式变频集中供热系统的动态能量特性与系统的规模密切相关,在不同的阶跃性负荷变动条件下,存在一个不同的时间常数,经过此时间常数的非稳态变化过程,系统从初稳态过渡到终稳态。根据分布式变频集中供热系统在动态负荷下的响应特性与负荷需求特性,设定正确的运行调节方法和时间点可以在充分保证供热质量的前提下实现按需供热,减少能源浪费,提高系统的能源利用效率。

Based on the saving energy performance and load characteristic of central heating system with variable speed pump, a mathematic model of distributed variable speed system was established in this paper. The simulation result shows that the central heating system with variable speed pump has a time constant that is related with the capacity and its change rate of the heating system. Such time will be needed when a new steady state can be obtained after the heating supply capacity has been changed. The operation schedule according this may be helpful to supply satisfactory heating and save energy.