| 摘要 |
<p>The room ventilation system has a duct with an opening at each end and running at right angles to the openings. The air current passes through a larger cross-section at one opening that at the other, so that in the duct immediately before or after the larger opening it passes spontaneously through a portion with even larger cross-section. The volume of the larger portion (5) is altered dependent on pressure and/or flow proportions or other varying environmental conditions, e.g. temp. gas concentrations at various measurement points (32L4) along the path of the air current (3, 5, 6', 6").</p> |
