How should the water pump of the chiller be selected?

水泵选择原则及注意事项：

Water pump selection principles and precautions:

要满足在最高运行工况的流量和扬程,并使水泵的工作状态点处于高效率范围。泵的流量和扬程应有10%~20%的富裕量。当流量较大时,宜考虑多台并联运行,并联台数不宜超过三台。多台泵并联运行时,应尽可能选择同型号水泵。选泵时必须考虑系统压力对泵体的作用,注意水泵壳体和填料的承压能力以及轴向推力对密封环和轴封的影响。

To meet the flow and head in the highest operating conditions, and make the pump's working state point in the high efficiency range. The flow and head of the pump should be 10% to 20% of the abundance. When the flow is large, it is appropriate to consider multiple parallel operation, and the number of parallel units should not exceed three. When multiple pumps are running in parallel, the same type of pump should be selected as far as possible. When selecting the pump, we must consider the effect of system pressure on the pump body, pay attention to the bearing capacity of the pump housing and packing, and the influence of axial thrust on the sealing ring and shaft seal.

一般工程可按总管长的5~7m/100m选取损失扬程,再加上设备的损失扬程，即得到闭式系统水泵总扬程；开式系统总扬程与闭式系统总扬程不同，除系统损失扬程与设备 的损失扬程外，还得加上系统的实际扬程(水泵吸入扬程与输出扬程)。

In general, the loss head can be selected according to the main pipe length of 5-7m /100m, plus the loss head of the equipment, that is, the total head of the closed system pump is obtained; The total head of the open system is different from the total head of the closed system. In addition to the loss of the system and the loss of the equipment, the actual head of the system (pump suction head and output head) must be added.

首先，流量是选择冷水机泵时需要考虑的一个重要因素。流量是指在单位时间内通过水泵的水量，按照提升/分钟来确定。在选择冷水机泵时，需要根据冷水机的冷却需求来确定所需的流量。

First of all, flow is an important factor to consider when choosing a chiller pump. Flow rate refers to the amount of water passing through the pump in a unit time, which is determined by lifting/minute. When choosing a chiller pump, it is necessary to determine the required flow rate according to the cooling demand of the chiller.

其次，扬程也是选择冷水机泵时需要考虑的一个重要因素。扬程是指泵从低处将水泵送到高处所需的能量。在选择冷水机泵时，需要根据冷却水的使用场所计算抽水所需的扬程。最终，可靠性也是选择冷水机泵时需要考虑的一个重要因素。泵的可靠性是指泵在长期运转过程中的稳定性和耐久性。选用冷水机泵时，应选用可靠性较高的泵，以保证冷水机的正常运转和生产工艺的稳定性。

Secondly, head is also an important factor to consider when choosing a chiller pump. Head refers to the energy required by the pump to send the pump from a low place to a high place. When choosing a chiller pump, it is necessary to calculate the lift required for pumping according to the use of the cooling water. Ultimately, reliability is also an important factor to consider when choosing a chiller pump. The reliability of the pump refers to the stability and durability of the pump during long-term operation. When choosing a chiller pump, a pump with high reliability should be selected to ensure the normal operation of the chiller and the stability of the production process.

再次，效率也是选择冷水机泵时需要考虑的重要因素。泵的效率是指泵将输入的能量转化为水的流动能量的比例。正常情况下，泵的效率越高，能耗越低，对环境的影响越小。因此，在选择冷水机泵时，应尽可能选择高效的泵，以减少能耗和环境污染。我们将总结以上的解释内容后可选择出需要的水泵类型，型号，数量等。再此可得到计算好的扬程，流量，压力后我们把水泵假例到实施方案中，再进行二次复查和计算，即可得到最终的检验成果，亦方便可靠的得出结果，减少浪费。

Again, efficiency is also an important factor to consider when choosing a chiller pump. The efficiency of a pump refers to the proportion of the input energy that the pump converts into the flow energy of water. Under normal circumstances, the higher the efficiency of the pump, the lower the energy consumption, and the less impact on the environment. Therefore, when choosing a chiller pump, an efficient pump should be selected as far as possible to reduce energy consumption and environmental pollution. We will summarize the above explanation content can choose the required pump type, model, quantity and so on. After the calculated head, flow rate and pressure can be obtained, we will put the pump into the implementation plan, and then conduct a second review and calculation, so as to obtain the final test results, and obtain the results conveniently and reliably, reducing waste.

最后，综上所述，丹耐斯建议选择冷水机泵时应考虑的因素包括流量、扬程、压力。

Finally, to sum up, DANNICE recommends that the factors that should be considered when choosing a chiller pump include flow, head, and pressure.