Cooling water pump is the main energy consumption equipment of air conditioning system. With the change of cooling load of chiller, adjusting the cooling water flow is an important measure for energy saving operation of cooling water pump. At present, the flow of cooling water in the project is generally used to adjust the valve. In fact, most of the water is not adjusted, and the waste of energy is more serious. The variable frequency speed regulation of cooling water pump has increased some uncertain factors because of the operation of the chiller, the characteristics of the pipeline and the working condition of the cooling tower. Therefore, the energy saving of the cooling water pump is evaluated through the energy consumption analysis of the variable frequency speed regulation.
1. Comparison of energy consumption between cooling water pump and chilled water pump (hydraulic characteristics)
According to the similarity law of the pump, there is a relationship between the speed and power of the pump.
N1/N2= (n1/n2) 3 (1)
In the formula, N1 and N2 are the power of the rated and actual operating conditions of the pump, and kW; N1 and N2 are the speed of the pump and the actual operating conditions, respectively, r/min.
The formula (1) shows that the speed of the pump has a great influence on the power. In theory, the power change of the pump is proportional to the three power of the change of the speed. For example, the pump speed is reduced by 25% and the power consumption can be reduced by 57.8%. However, the different characteristics of the cooling water pipe in cold water system, cooling water system is fully closed, the origin through the pipeline characteristic curve, the pump head is used to overcome resistance within the system, and the cooling water system, there is difference in level between cooling tower water and a water collecting disc surface (see Figure 1), the difference is fixed value. Will not decrease with the flow of the water pump. purpose
Comparison of energy consumption of cooling pump
The cooling water pump is suitable for conveying liquid or physical and chemical properties of liquid in high pressure operation system, such as high-rise building water supply, boiler feed water, HVAC refrigeration cycle, bathroom and other cooling and heating water circulation supercharging and equipment matching, fire system and so on. The cemented carbide seal of different materials ensures that the transmission of different media is free from leakage. Such as the use of the overall stainless steel material made of cooling water pumps, suitable for chemical, food, brewing, pharmaceutical, textile and other industries.
It has the advantages of high efficiency, energy saving, smooth running and so on, and the shaft seal adopts the wear-resistant mechanical seal, using the temperature ≤ 100 C, working pressure ≤ 1.6MPa (16kg/cm3). Flow: 5-300m3/h lift: 5-250m speed 2900r/min
Multistage pipe centrifugal pump (short for cooling water pump)
The vertical segment and stainless steel shell structure, the import and export of pumps in the same horizontal line and the same caliber, can like valves installed in the pipeline, it also concentrated a multi-stage high-pressure pump, and the installation of vertical pump covers an area of small and convenient pipeline pump. It has the advantages of high efficiency, energy saving, smooth running and so on, and the shaft seal adopts wear-resistant mechanical seal, and has long life free.
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