Laboratory Products Fume cupboard technology as a combination of cost reduction and safety Manuela Sterns, Köttermann
Laboratories provide a safe working environment. This is exactly what fume cupboards maximise in the smallest research space in the room. The purpose of developing the EcoPlus low-energy fume cupboard from Köttermann was to operate it as cost-effi ciently and sustainably as possible.
It is conceivable that laboratory work requires a lot of electricity. Harvard University has taken a closer look at energy consumption in laboratories: Their research rooms occupy about a fi fth of the space, but consume almost half of the total energy. 44% of this is directly related to ventilation, which in turn is signifi cantly infl uenced by the fume cupboards. This once again enclosed working space in the laboratory room is essential for the safe use of volatile organic compounds, acids or solvents [1].
However, these devices in particular draw conditioned air from the laboratory, the treatment of which is energy-intensive and thus expensive as well as environmentally harmful. It is therefore important to pay particular attention to the ecological and economic effects of fume cupboards.
Reducing air consumption while maintaining safe working conditions is thus one of the most important requirements in the development of fume cupboards. The power consumption of a fume cupboard operated at maximum level with the sash open can reach a sum equivalent to the operation of three houses combined - calculated by Evan Mills and Dale Sartor of Lawrence Berkeley National Laboratory [2].
Figure 1: Saving energy by closing the front sash of the fume cupboard.
Saving energy with the sash
Exhaust air control systems are the keyword for fume cupboards in terms of power consumption, because they reduce the exhaust air fl ow when the sash is closed without jeopardising the safety of the fume cupboard. The exhaust air volume fl ow is controlled by a motor-driven damper depending on the sash opening. For each operating state of the fume cupboard, just as much air is extracted from the laboratory as is necessary for the safe operation of the fume cupboard. With the sash closed, the volume fl ow of a fume cupboard can be reduced by around 50% compared to the open state. With Köttermann fume cupboards, the sash opening is effortlessly adjusted via the TouchTronic electronic control unit using the controller on the display - precisely by sliding or selectively by tapping.
The automatic protection mechanism AutoProtect automatically closes the sash as soon as the work in the fume cupboard ends. This saves energy and at the same time minimises the potential danger. If something should ever protrude from the fume cupboard, CloseGuard uses a light grid to ensure that the sash stops automatically.
A fume cupboard as a sustainability ace
In addition to the sash position, the reduction of operating costs while complying with safety requirements can be achieved by a well thought-out product design. An example of this is the Köttermann fume cupboard EcoPlus, which requires a low air volume fl ow due to a special air technology and design.
With a recommended constant volume fl ow of 275 m³/h per metre of fume cupboard width, the EcoPlus consumes an exhaust air volume that is about 30% less than a standard fume cupboard on the market. This saves up to €1,000 in operating costs per year. Especially on the basis of energy savings without the installation of exhaust air controls, the EcoPlus is the ideal choice for laboratories.
The core of the EcoPlus is its unique fl ow technology: This reduces the air volume fl ow while simultaneously meeting all safety requirements. The standard is correspondingly high: in the robustness test for evaluating the performance of fume cupboards, the test gas burst of the EcoPlus is 70% below the limit value for fume cupboards required by the BG RCI.
Figure 3: The CloseGuard function stops the sash as soon as something protrudes from the fume cupboard.
Figure 4: Köttermann EcoPlus.
In summary a fume cupboard is considered safe if it corresponds to the state of the art, has been tested according to existing standards and complies with the prescribed limit values with large safety reserves. In practical laboratory use, the fume cupboard is always part of a process chain. Its safety is determined by many parameters that are influenced not only by the design of the fume cupboard but also by its use. An important question that needs to be answered is whether the air flow of the fume cupboard is disturbed by external influences at the installation site.
Figure 2: Safe fume cupboard control with the fume cupboard electronics TouchTronic from Köttermann.
The greater the danger from the processes carried out in the fume cupboard, the more important it is that the airfl ow is not infl uenced by people passing by or draughts in the laboratory.
INTERNATIONAL LABMATE - APRIL 2024
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