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Unit 7

room. “The air jet has to be aimed at the heart of what would otherwise be one of these persistent cells”, says Bejan.

But even more effective, he adds, are rooms equipped with a slow, steady sheet of moving air. For example, relatively cool air could sink through a porous ceiling through 25 a room and out through many vents in the floor. This constant air movement, called laminar flow, is already used in some laboratory clean rooms. Because laminar flow is less drafty, it is also more comfortable for occupants, says Bejan.

18. According to the text, getting rid of indoor pollution is -

(1) virtually impossible (2) the main usage of super-computer simulations (3) against common sense (4) beyond the ability of typical vent flows

לפי הפסקה השניה של הקטע , מאווררים רגילים יוצרים "כיסים בהם המזהמים נלכדים" (שורות 6-7 .)

19. According to the second paragraph, which is the fate of polluted air when using typical vent flow?

(1) It is totally uninfluenced (2) It is completely replaced by fresh air (3) It may remain in the room being ventilated (4) It dissipates turbulently and unevenly

שורות 5-6 : "חלק מהאוויר הלא טרי שכבר נמצא בחדר יוצר כיסים שלא זורמים...".

20. “Both situations” mentioned in line 16 are -

(1) two-dimensional air flow simulations (2) a single source of pollution, and a uniform dispersal of pollution (3) stagnant air cells and fresh air flow (4) real phenomena and super-computer simulations

00-03 מוזכרים שני המצבים שדומו – מקור יחד של זיהום ופיזור אחיד שלו.

שורות ב

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