Theoretical and Practical Ammonia Refrigeration; A Work of Reference for Engineers and Others Employed in the Management of Ice and Refrigeration Mach

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. 1895 edition. Excerpt: ...Well-jacketed Compressors. The make of machine with which Denton experimented was the Consolidated Ice Machine Company's, and the actual loss in the pumping efficiency of the compressors due to the above cause was 21.4 per cent. The compressors (including gas passages, valves, etc.) in this make of machine are exceptionally well arranged for receiving the fullest possible benefit from the jacket-water, and therefore the loss of pumping efficiency is reduced to a minimum. Where compressors are not so efficiently jacketed, the loss by superheating will vary from 21 to 25 per cent. Loss In Double-acting Compressors. An allowance of 30 per cent, for loss by superheating is necessary in the case of double-acting compressors when the gas enters the compressor through the heads and the heads are not jacketed. Before the efficiency of a plant can be determined it is necessary that the compressor should be fitted with an indicator, the engine and brine pumps with stroke counters, and that mercury wells should be placed at the following points, viz.:--Distribution Of Mercury Wells. (1) On the discharge pipe, near its point of outlet from the compressor. (2) On the ammonia discharge pipe from the condenser--immediately at its point of exit. (3) In the ammonia supply manifold of the refrigerator. (4) In the ammonia suction--or discharge--manifold of the refrigerator. (5) In the ammonia suction pipe--immediately at its point of entry to the compressor. (6) In the return brine pipe, just where it discharges into the refrigerator. (7) In the brine discharge brine pipe from the refrigerator. In cases where the pipes are horizontal and of sufficient diameter the mercury well should be constructed as in Fig. 9, in which A is the pipe, the temperature of...