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在目前的空调系统中,冷冻水泵的容量一般都按照设计工况(即最大设计冷负荷)选定的,且绝大多数的水系统均在全年固定流量工况下运行。但空调系统实际负荷远比设计负荷低(随季节、昼夜和其他因素而变化)。图1所示为办公楼建筑实际负荷率的变化情况,其他功能的建筑物亦有相似的情况。从图中可见,与决定水泵流量和压头的最大设计负荷(负荷率为100％)相比,一年中部分负荷出现的小时数很大。在冬季供热时,有80％以上的运行时间、负荷率低于40％,夏季供冷时,负
In current air conditioning systems, the capacity of chilled water pumps is generally selected according to design conditions (ie maximum design cooling load) and the vast majority of water systems operate at annual fixed flow rates. However, the actual load on the air conditioning system is much lower than the design load (varies with season, day and night and other factors). Figure 1 shows the changes in the actual load rate of office buildings, other functions of the building have a similar situation. As can be seen from the figure, part of the load occurred in a year with a large number of hours compared with the maximum design load (100% load rate) that determines the pump flow and head. In winter heating, there are more than 80% of the running time, the load rate of less than 40%, summer cooling, negative