Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Ventilation effectiveness measurements of three supply/return air configurations
AbstractBoth the ventilation effectiveness and the Air Diffusion Performance Index (ADPI) for three different distribution configurations of an office ventilation system were measured. Ventilation effectiveness was measured using a tracer gas technique that compares the actual delivery rates of outside air at specific locations to those projected for the case of perfect mixing. ADPI was computed from dry bulb air temperature, airspeed measurements, and acceptability criteria established by ASHRAE. Three different configurations of the supply and return air circuits for a recirculating constant volume system in a steady heating mode were evaluated. The total air circulation rate was set at a relatively low 2.9 L s−1 m−2. so as to accentuate any air mixing problems that may be present. The average ventilation effectiveness in the occupied zone ranged from 0.57 for a high-wall supply directed toward a high-wall return to 0.76 for a ceiling supply system with a low-wall return. These ventilation effectiveness compare to values of 0.73 and 0.66 for two tests of the original system configuration, which consisted of a celing supply with a ceiling return. Short-circuiting of the supply air to the return inlet was observed in the tests of each configuration. The ADPI measurements ranged from 50% to 63%. A correlation between measurements of ventilation effectiveness and ADPI was not expected nor observed.
Ventilation effectiveness measurements of three supply/return air configurations
AbstractBoth the ventilation effectiveness and the Air Diffusion Performance Index (ADPI) for three different distribution configurations of an office ventilation system were measured. Ventilation effectiveness was measured using a tracer gas technique that compares the actual delivery rates of outside air at specific locations to those projected for the case of perfect mixing. ADPI was computed from dry bulb air temperature, airspeed measurements, and acceptability criteria established by ASHRAE. Three different configurations of the supply and return air circuits for a recirculating constant volume system in a steady heating mode were evaluated. The total air circulation rate was set at a relatively low 2.9 L s−1 m−2. so as to accentuate any air mixing problems that may be present. The average ventilation effectiveness in the occupied zone ranged from 0.57 for a high-wall supply directed toward a high-wall return to 0.76 for a ceiling supply system with a low-wall return. These ventilation effectiveness compare to values of 0.73 and 0.66 for two tests of the original system configuration, which consisted of a celing supply with a ceiling return. Short-circuiting of the supply air to the return inlet was observed in the tests of each configuration. The ADPI measurements ranged from 50% to 63%. A correlation between measurements of ventilation effectiveness and ADPI was not expected nor observed.
Ventilation effectiveness measurements of three supply/return air configurations
Offermann, F.J. (Autor:in) / Int-Hout, D. (Autor:in)
Environmental International ; 15 ; 585-592
01.05.1989
8 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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