The Modern Plumber and Sanitary Engineer Volume 3

The Modern Plumber and Sanitary Engineer Volume 3

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1907 edition. Excerpt: ...necessary; and that the natural temperature of the room is not appreciably higher or lower than that of the surrounding air. Assuming all this, and, furthermore, that a gentle breeze is blowing towards the window in a line about normal to the plane of the opening, then, under these conditions, we have excellent ventilation supplied by natural power. But should one of the foregoing conditions not be satisfied, then the ventilation will become inconvenient, unsatisfactory, or non-existent. If, instead of driving directly into the window, the direction of the pressure is oblique, less air will pass into the building, unless this can be rectified by the opening of a wider inlet area. But if the wind does not impinge on the wall containing the window--unless there is another inlet opening more suitably placed--ventilation ceases to exist in any measurable degree. The same result would occur in the event of a calm, and it also follows as a corollary that the amount of air change is reduced in proportion to the wind. If, on the other hand, the air enters the room at a high velocity, a breeze is created which may become inconvenient and even distressing, not only from its contact with the person, but from the motion imparted to all the lightest articles in the room. The quantity of air admitted may be regulated, of course, by the partial closing of the window, but the speed of its entry remains the same. In winter a new set of difficulties is to be met with, particularly if the room is heated, for in that case the air admitted is considerably cooler than that already in the room. Here we have that bane of natural ventilation, a draught--and, worst of all, a cold draught. This is not only detrimental to health, but also unpleasant; and the more

Product details

  • Paperback | 80 pages
  • 189 x 246 x 4mm | 159g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236532791
  • 9781236532794