Bulletin - California Agricultural Experiment Station Volume 325-350

Bulletin - California Agricultural Experiment Station Volume 325-350

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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. 1920 edition. Excerpt: ... by 1750 cubic feet of air dropping 40 F., but one pound of water vapor will saturate only 235 cubic feet of air at 110 F. For example, if dry air enters the drying chamber at 150 F. and leaves it saturated with water at 110 F., 235 cubic feet will carry away one pound of water. But under these conditions with a 40 temperature drop, 1750 cubic feet is necessary to evaporate one pound of water, or more than 7 times as much as that required to carry away the evaporated moisture. The ratio will be less than 7:1 unless the entering air is perfectly dry, or the escaping air completely saturated with moisture. For example, if the entering air is 10 per cent saturated with moisture vapor at 150 F., and the exhaust air is at 110 F. and saturated with moisture vapor, 335 instead of 235 cubic feet will be required to absorb one pound of water vapor from the fruit. Again, if the entering air at 150 F. is 10 per cent saturated and the exhaust air at 110 F. is only 75 per cent saturated with moisture, 522 cubic feet of air will bea required to remove one pound of water vapor from the fruit; the ratio between the amount of air required to furnish heat and that necessary to remove the water vapor becoming 3.35:1. For simplicity the above calculations disregard the slight differences in the volume of air caused by changes in temperature. Knowing the tons of green fruit per charge, the drying ratio of the fruit and the estimated drying time, it is possible to calculate the minimum air-flow requirement for a dehydrater. For example, if a dehydrater is to hold ten tons of prunes with a drying ratio of 2:1, and is to dry the fruit in 24 hours, it will be necessary to remove 12,000 poiinds of water per 24 hours or 8.3 pounds per minute. If the temperature drop is 40...show more

Product details

  • Paperback | 226 pages
  • 189 x 246 x 12mm | 413g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236615735
  • 9781236615732