水冷机的产品选用要点:
1.水冷机的主要控制参数为制冷性能系数,额定制冷量,输入功率以及制冷剂类型等。
2.冷水机组的选用应根据冷负荷及用途来考虑。对于低负荷运转工况时间较长的制冷系统,宜选用多机头活塞式压缩机组或螺杆压缩机组,便于调节和节能。
3.选用水冷机时,优先考虑性能系数值较高的机组。根据资料统计,一般冷水机组全年在100%负荷下运行时间约占总运行时间的1/4以下。总运行时间内100%、75%、50%、25%。应注意该型号机组的正常工作范围,主要是主电机的电流限值是名义工况下的轴功率的电流值。
负荷的运行时间比例大致为2.3%、41.5%、46.1%、10.1%。因此,在选用冷水机组时应优先考虑效率曲线比较平坦的机型。同时,在设计选用时应考虑冷水机组负荷的调节范围。多机头螺杆冷水机组部分负荷性能优良,可根据实际情况选用。
4.选用水冷机组时,应注意名义工况的条件,水冷机的实际产冷量主要与两个因素有关:冷水出水温度和流量;冷却水的进水温度、流量以及污垢系数。
5.选用冷水机组时,在设计方面选用中应注意:在名义工况流量下,冷水的出口温度不应超过15℃,风冷机组室外干球温度不应超过43℃若必须超过上述范围时,应了解压缩机的使用范围是否允许,所配主电机的功率是否足够。
电脑控制器对各个模块的控制是通过通信线和总接口板来实现的,造成通信故障的主要原因是通信线路接触不良或断路,特别是接口受潮氧化造成接触不良,另外单元电子板或总接口板故障,地址拨码开关选择不当,电源故障都可造成通信故障。
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