In actual projects, the phenomenon of circulating pump capacity is relatively large, and some even reached more than 2 times the original parameters, if the circulating pump flow and head is too large, will cause serious waste of energy. Therefore, the performance of circulating pump and the rationality of the parameters, it is particularly important. What caused the circulation pump capacity is too large? Circulating pumps caused by large circulating pump capacity are mainly due to the following: 1. Some designers did not carefully calculate the heat load and system resistance, especially the resistance of the external network and the boiler room, take the estimation method. To be on the safe side, the estimated value is too large, which increases the flow and lift of the selected circulating pump. 2. Some systems do not carry out serious initial adjustment after operation. Once the system has hydraulic imbalance, it is considered that the circulating flow of the pump is not enough, it can not meet the requirement of circulating water and blindly replace the large pump. 3. There are individual designers on the concept of circulating pump head is unclear, the pressure boilers heating system set point pressure in the suction side of the circulating pump, circulating pump import and export are subject to the same hydrostatic pressure, so its head does not need to consider the user System height, as long as you can overcome the pipe network system resistance. However, designers have included the system height into the head, which greatly increased the head of the circulating pump, also increased the circulating pump power consumption. 4, select the circulating pump, the pump series due to restrictions, it is difficult to choose the flow, lift exactly the same pump, generally choose a larger one. Such layers of code, resulting in capacity is too large, even up to 1-2 times more. According to the investigation, the existing heat exchange station in operation has a temperature difference of more than 10-15 degrees for the supply and return water and an individual temperature difference of only 8 degrees, which proves that the capacity of the selected circulating water pump is too large. Pump capacity is too large, on the one hand destroyed the original design of hydraulic conditions, on the other hand increased the power consumption of the pump operation, increased heating costs. Further Reading: pump valve pipe fittings Exhibition Water Expo Xiamen exhibition of marine equipment Internet + Forum Yiwu Fair 2016 exhibition mold top ten brands of the Internet information industry (Xiamen) Technology Co., Ltd. Author: Asian pumps Network Editor: Yao Xiaoxia (QQ / WeChat:) http://beng.liuti.cn/ (Service Hotline:)
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