If your industrial or home equipment contains pumps, or you have plans to use pumps, these 10 pump energy-saving tips are what you must know!
Pumps have a wide range of applications and are a widely used mechanical equipment. Since they need to be used with motors, the energy consumed during operation cannot be underestimated. Therefore, it is necessary to implement energy conservation in order to protect the pump and protect nature. Nowadays, most factories pursue improving industrial energy efficiency and productivity. In addition to using equipment that meets national energy-saving standards, the following explains what other energy-saving solutions can be adopted, as well as related suggestions.
1. Avoid Oversizing Your Pump
Operating conditions are the main basis for pump selection. To be on the safe side, a safety factor is retained when selecting a pump to prevent the operation from exceeding the initially provided conditions and causing the shaft power to exceed the rated power, such as an increase in flow. If the pump size is too large, it will not be able to operate in the optimal efficiency area, resulting in unnecessary energy waste and maintenance costs. The on-site operating conditions must be taken into consideration, and the best operating point of the pump performance curve must be considered to make the correct choice. The pump that best meets your needs.
2. Use Variable Frequency Drive
The frequency converter can be installed on the motor system, or the pump motor can be controlled by a built-in frequency converter. The frequency converter can adjust the lift and flow rate by changing the motor speed to meet changing system requirements. From the formula below, we know that reducing the speed can save cubic power consumption, improve efficiency, and also help extend the service life. However, the head will decrease accordingly, so attention should be paid to whether there is a problem that the pump cannot pump out liquid.
3. Switch to A High-Efficiency Pump
Try to use high-efficiency pumps, and select the correct pump model based on fluid characteristics, application area, flow rate, power requirements, etc., and then use it with a high-efficiency motor. This method can achieve the greatest energy-saving effect.
4. Parallel Pump Delivery System
For systems with different load requirements, adjusting the pump configuration is a good alternative to VFD. Multiple pumps or large and small pumps are connected in parallel and run in stages as a system, mainly with one (larger) main The pump is responsible for most of the delivery work. When there is a need for more flow or sudden damage, other (smaller) pumps are started to support, reducing the burden on the main pump. Pumps connected in parallel help control the flow rate and adjust the flow rate while keeping the head constant, so it can effectively improve efficiency. Basically, the energy efficiency of each pump is used to determine the combination that will produce the highest performance.
5. Dressing Impeller
Cutting the impeller is also one of the ways to save pump energy. Of course, it must not be smaller than the impeller diameter range on the pump performance curve. The impeller becomes smaller, the peripheral speed of the impeller is reduced, the energy transferred to the fluid is reduced, and the flow rate, pressure, and lift are reduced to reduce energy consumption and improve energy efficiency. However, there may be a risk of excessive cutting and insufficient lift. It is necessary to understand the customer's operating conditions and then trim the impeller to a suitable size.
6. Minimize Pipe Damage
Reducing the power loss caused by pipeline pressure or accessories can reduce the power required by the pump to overcome the pipe loss, so it also becomes an energy-saving method. Factors such as pipe size, length, flow rate, surface roughness, material, and fluid characteristics will all affect the system pressure drop. Therefore, the number of bends, expansions, and contractions in the pipes should be minimized during design. In addition, reasonable selection also needs to be understood. The flow rate needs to be matched with a reasonable pipe diameter.
7. Use Appropriate Control Valves
Control valves are used to control flow or pressure. The valve prevents energy loss through throttling and bypass loops, maintaining optimal flow without wasting energy. Choosing the correct pump control valve based on the piping system can significantly reduce head loss and achieve energy savings.
8. Choose the Appropriate Pump Seal Type
The sealing system affects efficiency, including static sealing and dynamic sealing. Leakage of static and dynamic seals will not only cause fluid waste and pollute the environment, but also reduce the volumetric efficiency of the pump. In many applications, the energy savings from a high-efficiency sealing system may be greater than switching to a variable frequency drive, trimming an impeller, or resizing a pump.
9. Reduce Unnecessary Use
Turn off unnecessary pumps in a timely manner. This is the simplest but also easily overlooked method. When flow requirements change, a pressure switch can be used to control the number of pumps in use.
10. Regular Maintenance
Regular maintenance work and efficiency testing can ensure that the pump operates within the optimal operating area. If there are any component problems, they can be discovered and replaced early, and can reduce the possibility of failure or efficiency decline caused by these problems. In addition, since the operating efficiency of a pump that has not been properly maintained for many years may be worse than that of a new pump when it was purchased, regular maintenance is also a necessary step.
After understanding the above ten pump energy-saving techniques, we should adopt appropriate measures according to the relevant standards of pump efficiency in various countries and the operating environment, so as to jointly contribute to energy conservation and ensure the safety of equipment.
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