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Laboratory fume hoods for high heat load: A special challenge needs a special design
Juergen Liebsch, Waldner Laboreinrichtungen GmbH & Co. KG
With the title 'Fume cupboards – Part 7: Fume cupboards for high heat and acidic load' the seventh part of the European series of EN 14175 standards has been issued in 2012. The new standard is dealing with fume hoods for special applications, including a high heat and/or acidic load. These special applications require additional design, safety, operating and maintenance properties. While the previous standards exclusively described isothermal conditions in the fume hood, the newly issued part 7 offers the option to assess the safety of fume hoods at high heat load. This closes an essential gap, as works with sources of heat in a fume hood are part of the daily routine in many laboratories.
The presentation will give an overview of the standard's content and the safety and performance objectives for such fume hoods and an insight in theoretical considerations and experimental examinations, particularly with regard to the effects of the high heat load.
The standard's requirements and the theoretical and experimental findings lead to a new fume hood design which should be introduced. For quantifying the safety performance in relation to the energy demand, the new designed fume hood has been tested according EN 14175-7 and BSR/ASHRAE Standard 110P. Results of these tests show that it is possible to translate the non-trivial requirements of the standard into innovative solutions and thus give a contribution to the safety and energy efficiency for the operation of fume hoods with high heat load in laboratories.
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