| 摘要 |
<p>PURPOSE: A method for controlling in proportion to a differential pressure of a heating and cooling system is provided to compare a measured differential pressure with a set differential pressure of a supply pipe and a return pipe and change frequency according to differential pressure scale line if the measured differential pressure is higher or lower than the set differential pressure to control acceleration/deceleration of a pump. CONSTITUTION: A method for controlling in proportion to a differential pressure of a heating and cooling system respectively attaches first and second pressure sensors to a supply tube and a return pipe. When a measurement differential pressure(c) is lower than a set differential pressure, frequency is increased to a frequency of a lift point(d) corresponding to the measured differential pressure in a differential pressure scale line(DL) to accelerate a pump. In the differential pressure scale line, the differential pressure of a differential pressure deviation point at which a flow rate is zero is theoretically equal to a theoretical differential pressure of a point of cut-off (H3).</p> |
