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  • 1
    Electronic Resource
    Electronic Resource
    Comparison of Capture Efficiencies Measured by Tracer Gas and Aerosol Tracer Techniques (1998)
    Oxford, UK : Munksgaard International Publishers
    Indoor air 8 (1998), S. 0 
    Details
    ISSN: 1600-0668
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Medicine
    Notes: Abstract The capture efficiency of an exhaust device was evaluated using a tracer gas (helium diluted in air), and an aerosol tracer of varying particle size distributions. Helium concentrations were measured by mass spectrometry, and those of the aerosol were evaluated using optical and photometric particle counters in order to follow the temporal evolution of the concentrations. This experimental study confirms the theoretical results obtained from mathematical simulations (CFD), and from the simple study of the particle relaxation time and sedimentation velocity of particles. It demonstrates that the transfer of an aerosol to a square local exhaust system of 20×20 cm2 is nearly identical to that of a gas when all the following conditions are fulfilled:〈list xml:id="l1" style="custom"〉•diameter of particles less than about 30 μm;•low initial particle emission velocity (of a few tens of cm/s);•direct capture and short transfer times between the source and the capture system (less than a few seconds).It is then possible to use the tracer gas technique to measure the capture efficiency of an aerosol if the above-mentioned conditions are fulfilled.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0668.1998.t01-3-00007.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Evaluating Age from Arbitrary Forms of Injection Functions of Tracer (1999)
    Oxford, UK : Munksgaard International Publishers
    Indoor air 9 (1999), S. 0 
    Details
    ISSN: 1600-0668
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Medicine
    Notes: Abstract The age of the air in a room is normally determined either from a pulse response or from a step change response (up or down). There are a certain number of problems involved in applying these two theoretical models, especially those associated with the duration of the injection, which must either be infinitely short or infinitely long. A hybrid method that consists of injecting a known quantity of tracer for a given time offers the advantages of both methods. The equation for calculating age is exact, regardless of the type of flow considered, and is derived from the expressions already established for a pulse response to which a correction is included to account for the tracer generation function. If a rectangular pulse is used for the injection, the solution is particularly simple.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0668.1999.t01-2-00009.x
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
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