MC-4/11/10/400/00
日期:2018-10-8电容式湿度传感器中采用高分子薄膜式湿敏电容,其平面结构与侧面结构,是由两个下电极、上电极、质膜及引线构成,其实际结构是两只串联电容。当环境相对湿度变化时,高分子薄膜能通过网状多孔上电极吸收或释放出水分,从而导致电容量的变化,再通过对电容标定,即可以检测出环境的湿度。在车间设置相对湿度传感元件,自动测试车间的相对湿度,再用变频器可随时自动调节电机速度,从而改变风机速度及送风量,以达到自动调节车间相对湿度的作用,因此能及时准确地调节车间相对湿度,从而提高纱线、纱布的质量。
以典型电厂中央空调系统为例,冬季和夏季的运行工况是不同的,夏季工况包括冷冻水循环系统、冷却水循环系统及制冷机;冬季工况包括热水循环系统和加热器。其中冷冻水系统和热水系统共用冷热水泵。
某百万千瓦级电厂空调系统拥有5台冷热水泵和冷却水泵。在夏季工况系统运行时,启动2台冷热水泵和1台冷却泵,冬季工况只动1台冷热水泵。控制系统根据中央空调冷热水送回水温差及制冷机冷却水出口温度控制各个水泵电机的起停及转速。系统投运后18个月可收回整套设备投资。
变频有很多优点,但是在使用中也要注意有关问题,保证变频器的正常工作条件及使用环境,才能保证变频器及相关设备的安全稳定运行。由于变频器在整流和逆变过程中会产生大量谐波,会对附近的电子设备如仪器仪表、控制器、PLC等产生干扰,应视实际情况采取加装人口或出口电抗器,对机柜加强屏蔽或其他抗干扰措施。
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