Method for operating heating system of gas condensing boiler plant, involves increasing pump speed if calculated differential pressure is lower than intermediate threshold value, upper threshold value and lower threshold value

摘要

The method involves measuring flow volume of fluid delivered by pump using a mass flow sensor. A differential pressure of pump is calculated based on instantaneous pump speed and current flow volume of fluid using two-dimensional characteristic diagram. The pump speed is reduced if calculated differential pressure is greater than an intermediate threshold value (3.1), an upper threshold value (3.3) and a lower threshold value (3.2). The pump speed is increased if calculated differential pressure is lower than intermediate threshold value, upper threshold value and lower threshold value.