This section collects topics related to energy efficiency and energy savings in variable speed drive systems. Here we present articles with fundamental theory, posts about best practice, share case studies and so on. Scroll down and discover what is available.
VFD multidrives: Additional energy savings In our introduction [1] to VFD multidrives we have listed the key benefits of multidrive concept. One of them is improved energy efficiency. Now it is time to look into it closer and demonstrate that it is true. This article is about improved energy efficiency Read more…
Sustainable drive systems throughout the entire life cycle Sustainability is a popular word in today’s dictionary. In our opinion this is very good as long as the efforts are sincere and it is not just marketing. Variable frequency drives (VFD) help reducing energy consumption, especially in variable flow applications such Read more…
Energy saving assessment for a drive system Variable frequency drives (VFD) often allow considerable energy savings for the end user. We have previously shared case studies on variable speed fans [1] and variable speed pumps [2]. Resulting payback time can be 2 to 3 years. Despite this known advantage of Read more…
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…
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…