Why frequency conversion energy saving is false energy saving
In industrial production and product processing and manufacturing, fans, pumps and equipment used in a wide range of applications; its power consumption and such as valves, baffle related equipment throttling losses and maintenance, repair costs accounted for the production cost of 7% to 25%, is not a small amount of production costs expenditure. At the end of the eighties, frequency conversion speed control technology was introduced into our country and promoted. Now in the electric power, metallurgy, petroleum, chemical industry, paper, food, textile and other industries in the motor transmission equipment has been practically applied. At present, frequency conversion speed control technology has become a major development direction of modern power transmission technology. Excellent speed performance, significant power saving effect, improve the operating conditions of existing equipment, improve the safety and reliability of the system and equipment utilization, extend the service life of the equipment and other advantages with the continuous expansion of the field of application has been fully embodied.
According to the production needs of the furnace pressure, air velocity, air volume, temperature and other indicators for control and adjustment to adapt to process requirements and operating conditions, the most commonly used control means is to adjust the size of the damper, baffle opening to adjust the controlled object. In this way, regardless of the size of the production demand, the fan has to run at full speed, and changes in operating conditions make the energy to the dampers, baffles of the throttling losses consumed. In recent years, out of the urgent need for energy saving and the requirements of the continuous improvement of product quality, coupled with the use of frequency converter speed regulator (referred to as frequency converter) is easy to operate, maintenance-free, high control accuracy, and can achieve high functionality and so on; and thus the use of frequency converter-driven program began to gradually replace the dampers, baffles, valves, the control program. The basic principle of frequency conversion technology is based on the motor speed and working power input frequency is proportional to the relationship: n = 60 f (1 - s) / p, (where n, f, s, p were expressed in the rotational speed, input frequency, the motor turn rate, motor pole pairs); by changing the frequency of the motor operating power supply to change the purpose of the motor speed.
Although the frequency converter in a particular operating environment does have a good energy-saving effect, but from if the introduction of plant production of this key data and the principle of conservation of energy to analyze, I think the frequency converter can not be counted as energy-saving, is a false energy-saving, is not a true energy-saving. As we all know, the essence of frequency conversion is to change the speed, when the output is not so high, that is, do not need the original design value of the air volume, automatically reduce the speed to reduce the supply of air, to achieve no waste of energy. In order to make the problem more simple and easy to understand, I assume that a certain period of time the production of air volume required for 0, the frequency converter will be adjusted to 0 speed, theoretically energy-saving, and is saving 100%, but in fact, there is no factory output, the output of 0, which can be calculated as energy-saving it? If this is considered energy-saving, then we do not have to spend money to install the inverter, directly off the power supply is not to achieve the same effect?
On the other hand, inverter is not everywhere can save power, there are a lot of occasions with inverter does not necessarily save power. As an electronic circuit, the inverter itself consumes power (about 3-5% of the rated power). A 1.5 HP air conditioner itself consumes 20-30W, which is equivalent to a long-lasting lamp. Inverter running at industrial frequency, with power-saving function, is a fact. But his prerequisites are: first, high-power and fan/pump loads; second, the device itself has a power-saving function (software support); third, long-term continuous operation. These are the three conditions that reflect the effect of power saving. In addition, it does not matter whether the power saving, there is no meaning. If you do not add the preconditions of the inverter frequency operation energy saving, is exaggerated or commercial speculation.
In summary, I thought the inverter is not really energy-saving, is false energy-saving. Know the original reason, you will skillfully use him to serve you. Must pay attention to the use of occasions and conditions of use in order to apply correctly, otherwise it is blind, gullible and "deceived".