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Effective triad

The vanadium Vanadium is a chemical element with the symbol V and atomic number 23. This steel-grey, bluish shimmering transition metal is mined as ore and used mainly in steel construction. Vanadium can be recovered as a by-product of energy production from coal-fired power plants and by burning heating oil. It is non-flammable, providing high level of safety and, thanks to its full-reusability, has a high residual value. redox Red stands for reduction = gain of electrons, while Ox stands for oxidation = loss of electrons flow technology offers the ability to optimise energy costs Energy costs are costs of producing energy (water, electricity and gas costs). These are calculated and allocated to the respective cost units using an overhead allocation base. in interaction with own generation and efficiency actions. This is becoming more important regarding the rising electricity prices.

Around 307 hours of sunshine during September 2012 in Bielefeld – unfortunately not on the 26th of September 2012. It rains! However, knowing that the sunny days will come up soon you can feel the positive spirit at the GILDEMEISTER Headquarter in Bielefeld that day. The energy experts of GILDEMEISTER energy solutions have realized an integral energy concept, which is an example of its complete product and services range.

This concept shows how one can reduce the energy costs Energy costs are costs of producing energy (water, electricity and gas costs). These are calculated and allocated to the respective cost units using an overhead allocation base. through systematic energy management, self-generation and energy storage. For example, due to lower external electricity purchase, peak load shaving and efficiency measures, the manufacturer of machine tools and provider of machine technology, service, software production and energy solutions in Bielefeld was able to save about 257,000 € in 2012. The Group is now planning to implement customised energy concepts at all locations.
Reducing energy costs Energy costs are costs of producing energy (water, electricity and gas costs). These are calculated and allocated to the respective cost units using an overhead allocation base. is becoming more and more important for companies like GILDEMEISTER. The Bundesverband der Energie-Abnehmer (VEA), a current study which compares electricity costs, has shown that electricity costs for companies have increased by approximately 12.4 % since July 2012. Despite obvious lower trade prices, the study shows a significant price increase. The reasons for the rise lie above all in the increasing levy with which the electricity costs are burdened, as well as with the increasing system usage charge. 

SETTLED ELECTRICITY PEAKS
“Increasing energy efficiency began in Bielefeld with identifying areas that consumed an excessive amount of energy,” says Dr. Frank Beermann, Managing Director of GILDEMEISTER energy solutions. “Based on a systematic actual state analysis, we were able to analyse the consumption and save a considerable sum with an efficient usage of energy, as well as with the replacement of the biggest energy guzzlers.

The experts from GILDEMEISTER energy efficiency GmbH also offer their knowledge to other industrial customers. Over 76 points for saving energy were identified in addition to hall lighting, air-conditioning and compressed air systems. The largest energy consumers were found to be the hall lighting and the building ventilation systems, each accounting for around 30 % of consumption.
“At the same time these were the largest savings potentials.” New ventilation and air-conditioning technology saved about 38 % of the overall savings. With these measures the overall electricity costs were reduced by an impressive 25 % in this first step.
Moreover: They generate up to 15 % of the required energy in Bielefeld. However, only four small wind turbines are in operation, which contribute 40 kW Kilowatt (kW) is a unit of electrical power (energy consumption over time), 1 Kilowatt is equal to 1,000 watts. . Around 95 % of the electricity generated originates directly from solar energy. The solar tracking systems, SunCarrier, produce around 785 kWp. Besides the plant, other sensitive areas, like the IT-office, are supported with green energy. 

A key part of the park is the CellCube storage system. At the beginning of 2012, the storage system with a storage capacity of 400 kWh A kilowatt hour (kWh) is the amount of energy equivalent to powering one kilowatt (1 kW) for one hour (1 kW x 1 hour). Accordingly, there are megawatt hours (1 MWh = 1000 kWh) gigawatt hours (1 GWh = 1000 MWh = 1 million kWh) and terawatt hours (1 TWh = 109 kWh = 1 billion kWh). 1 kilowatt hour of electricity is equivalent to 17 hours of light from a 60 watt bulb. was commissioned. In addition, two smaller CellCubes provide each 10 kWh A kilowatt hour (kWh) is the amount of energy equivalent to powering one kilowatt (1 kW) for one hour (1 kW x 1 hour). Accordingly, there are megawatt hours (1 MWh = 1000 kWh) gigawatt hours (1 GWh = 1000 MWh = 1 million kWh) and terawatt hours (1 TWh = 109 kWh = 1 billion kWh). 1 kilowatt hour of electricity is equivalent to 17 hours of light from a 60 watt bulb.. “The CellCube could be scaled optimally due to the simple installation and the concept of a container”, explains Beermann. If required, the storage system can be expanded simply. Depending on the application and size of the installation, a flexible use from MW up to MWh is possible. “The long-life vanadium-redox-flow storage system offers an uninterruptible electricity supply. Due to the vanadium-redox-flow storage system, the GILDEMEISTER Group building runs on 100 % renewable energy and electricity peaks can be covered.” Through an even and application- orientated distribution the local electricity generation and storage is ideal for personal consumption. The technology can ensure main buildings, like an IT building, continue to operate during power cuts. “For extremely critical areas the power supply can be provided within milliseconds.”
The storage system is non-flammable and non-explosive. “Latest reports with Boeings Dreamliner show the importance of those features. Especially when the dimension of storage systems increases.” Depending upon the size of the system it can be discharged AC and DC. The efficiency is up to 80 %. The charging and discharging cycles also influence the size of the storage system. Those influences are only minimal. 

FUNCTION
The liquid energy carriers are stored in two tanks and pumped through the electrochemical cells. The system works together with a vanadium-redox-pair per halfcell. The energy carriers are either charged or discharged depending on the applied voltage. A stack is a number of serially connected cells, with electrolyte An electrolyte is a chemical substance that exists in a solid, liquid or dissolved state and that conducts electricity when voltage is applied. In batteries and battery packs, electrolyte is the medium that transports the ion between the anode and cathode and generates ions for charge balancing. from both tanks flowing through them. The storage system is then charged and discharged via these cell blocks.

LATEST TECHNIQUE STANDARDISED
Beermann tells that the biggest current challenge lies in the still very young energy storage market and its progress. “Various advantages, like the almost unlimited cycles and the deep discharge The term deep discharge generally refers to the withdrawal of almost all of the capacity of the battery. It is discharged to such an extent that the voltage drops below the final discharge voltage., can only be seen at a second glance”, explains the Managing Director. 

“Despite the relatively young technology, we have 15 years of development experience and a variety of storage systems installed for different usage and in different regions. We have moved on from the experiment phase. Today we are talking about a standardized, field-tested industrial product.” Overall 50 systems are installed, with the first applications starting about 5 years ago.
Some potential fields of applications include, for example, private consumption increases, peak load leveling (cut-off) and micro grid installations. Outside Europe the off-grid systems hold a lot of promise. “Our product can reduce fossil energy generation, especially diesel generators. But they can also develop remote areas without grid connection.”
From Beermanns point of view, the much discussed and expensive grid expansion could become partly obsolete with the intelligent and decentralized storage solution. The system for power companies could be expedient, both in the interim storage and grid stabilization. “Islands and energy cooperatives could profit out of that.” 
www.vea.de

FEATURES OF THE VANADIUM-REDOX-FLOW STORAGE SYSTEM
The system uses liquid energy carriers with dissolved vanadium Vanadium is a chemical element with the symbol V and atomic number 23. This steel-grey, bluish shimmering transition metal is mined as ore and used mainly in steel construction. Vanadium can be recovered as a by-product of energy production from coal-fired power plants and by burning heating oil. It is non-flammable, providing high level of safety and, thanks to its full-reusability, has a high residual value. salts that do not age and can be used an unlimited number of times. It has an extremely long service life, 100 % deep discharge The term deep discharge generally refers to the withdrawal of almost all of the capacity of the battery. It is discharged to such an extent that the voltage drops below the final discharge voltage. capability, and unlimited charging and discharging cycles. Moreover, it responds spontaneously to load requirements. The self-discharging is negligible. The power output and storage capacity are scalable independently from each other. The storage system requires little maintenance and is non-flammable and non-explosive.

Published in energiespektrum on 16 September 2013

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