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Energy saving using inverter is always vary application to application. Following points you need to consider before using inverters for energy saving. - How much process flow and pressure requirement through AC motors
- Existing control methodology like control valve in pumps, Damper or guide vane for Fans & Blowers etc. and position of the valve or dampers
- If you have process flow and pressure data and pump or fan design data, you can calculate energy saving using affinity law
- Loading and Unloading cycle for compressor application. If the unloading time is higher for compressor application, you will get better energy saving
- Using affinity law, you can calculate the energy saving with consideration of inverter losses. With this you can calculate the Pay back of inverters.
Energy savings as it relates to frequency inverters as above explained. My technology uses negative amp draw to develop the torque in our motors, the traditional amp draw is blocked bi-directionally by our power electronics. Hence, our electric power consumption neutralization platform is an electric power production and a power performance platform as opposed to an inverter energy savings and performance sacrificing platform.
The other time I have seen inverters save energy in non-centrifugal machines is when mechanical vari-drives are used, such as variable pulley systems, hydraulic drives, particle clutches etc., but only IF it is only speed control you are after (as opposed to torque multiplication when using a vari-drive for instance). The losses in an inverter are slightly lower than the losses in most other non-electronic speed control methods.