Refrigerating World Volume 34

Refrigerating World Volume 34

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1907 edition. Excerpt: ...and the compressor should be large and without restrictions that will reduce the pressure of the gas entering the compressor. This is one of the old time mistakes and should be avoided. The pressure at the compressor governs the size of the compressor, while the average pressure in the evaporating apparatus determines the temperature and value of the surface in that apparatus. It would be well for you to determine, for your own satisfaction, just what pressure your plant is really working under. It will explain some of the things which sometimes puzzles you. All piping or apparatus containing ammonia, from the liquid valve to the compressor, should either be doing work or be insulated. The losses sustained from not following this rule are very considerable. After disposing of the evaporating apparatus, we take up the ammonia compressor. The compressor will have to handle, under the average conditions, about forty pounds of ammonia gas per ton of ice, and the size of the compressor depends on the volume of this gas and the efficiency of the compressor. The volume of the gas depends upon the pressure at which it enters the compressor. When the number of cubic feet of gas to be handled is determined, then the question of compressor efficiency must be considered. You probably know that some of the compressors on the market will not give more than 50 per cent, efficiency, owing to the clearance, and to the bad design of valves and connections, while in others the efficiency will be 80 per cent. This efficiency question is one which every one buying or operating ice making machinery should understand. You should remember that the efficiency of a compressor varies with its back pressure. Hence if you ask for bids on a compressor to do a certain...
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Product details

  • Paperback | 336 pages
  • 189 x 246 x 18mm | 599g
  • United States
  • English
  • black & white illustrations
  • 1236888154
  • 9781236888150