Energy savings in pump systems: Case study 1 After introducing the way how energy and cost savings are calculated [1] we will demonstrate the theory on a real example from industrial practice. This article presents a case study of a boiler feedwater pump inside a thermal power plant. Let’s explore Read more…
Case study on energy savings in variable flow fan systems.
How to calculate energy and cost savings Our series on energy efficiency continues. The need for more energy efficient systems emerges day by day driven by increasing environmental concerns. Today’s post will guide you through calculation of energy and cost savings when utilizing a VFD in flow control. Energy savings Read more…
VFD versus fluid coupling Today we open a topic that might polarize our readers: Comparison between variable frequency drive (VFD) and a fluid (hydrodynamic) coupling. Of course, this blog is dedicated to VFDs. Nevertheless, we intend to provide an objective benchmark as far as possible. Please note that there is Read more…
Input power factor and reactive power consumption The focus in all energy efficiency initiatives is to minimize the losses, improve the system efficiency and reduce overall power consumption. With “power” people usually refer to active power and this is basically correct. Main purpose of VFD is to reduce active power. Read more…
What efficiency can you expect from your drive system? In general, the efficiency of a drive system utilizing VFD is high. The differences come from the VFD topology, dimensioning and technical solution. As discussed in our previous post, the user shall always compare total efficiency of a complete drive system. Read more…
How to compare efficiency figures of drive systems? Just two important reminders before starting with the topic: 1) Always keep in mind that the energy savings come due to variable speed control. The load consumes significantly lower power when the speed is reduced and the process is such that it Read more…
#Energy efficiencyPart 3: Selection of VFD technology What type of VFD technology fits the best your demands? The answer depends mainly on your process and operation philosophy. Process dynamics Is your process very dynamic and fast response is required? Then you will need a high performance drive that can track Read more…
#Energy efficiency Part 2: Applications with energy saving potential What applications can benefit from variable frequency control the most? To help understand it we use some fundamental equations (don’t worry, there will be no high mathematics!). Mechanical power Pmech is the product of torque T and angular velocity w. The Read more…
#Energy efficiency Part 1: Introduction Energy efficiency is a big topic that the society talks about. One reason is the increased awareness of the impact of human on the planet and effort to minimize this impact, other reason is purely economical considering cost benefits due to energy savings and competitive Read more…