Management of dairy plants . 4 pound 456 162024 3-5 4-5- + + 28.+ 27. 78 28 32 6. 7- + 25-5+ 24. I 9 36 7-9 -\-22>. lO 40 9- + 22. II 44 + 21. ij^ 12 13 48 52 + 20.+ 19. 2 566062 1. 122 + 17.+ 14-5+ 12. 1718 6468 I 1331. 142 + + 8. 2K 19 202122 72808488 2 + 5-+ 0— 3 23 24 9296 193 — 5- — 8. 3K 2526 100104 23. —12.—17- 27 108 1. 229 25-5 —22. 4 2932 116128 —54- .•) 34 ? .- 138 1-3
Management of dairy plants . 4 pound 456 162024 3-5 4-5- + + 28.+ 27. 78 28 32 6. 7- + 25-5+ 24. I 9 36 7-9 -\-22>. lO 40 9- + 22. II 44 + 21. ij^ 12 13 48 52 + 20.+ 19. 2 566062 1. 122 + 17.+ 14-5+ 12. 1718 6468 I 1331. 142 + + 8. 2K 19 202122 72808488 2 + 5-+ 0— 3 23 24 9296 193 — 5- — 8. 3K 2526 100104 23. —12.—17- 27 108 1. 229 25-5 —22. 4 2932 116128 —54- .•) 34 ? .- 138 1-307 74 MANAGEMENT OF DAIRY PLANTS WaZec Qycc/Zory e-L-y. Fig. 16. — York single-acting ammonia compressor. MECHANICAL REFRIGERATION 75 and there condensed back to its liquid form. The compressortakes care of the first factor in this Hquefaction; namely, thesubjection of the ammonia gas to the pressure necessary forliquefaction. The condenser takes care of the second factor;namely, the removal ofheat and the resultantcondensation to liquidform. We distinguish be-tween two forms of com-pressors — the Single-Acting and theDouble-Acting. Thesingle-acting compressoris always of vertical con-struction; the double-acting is most commonlyhorizontal, although afew of them are of thevertical type. I. Single-Acting Com-pressor. — Fig. 16 rep-resents the compressorcylinder of a single-act-ing compressor. Thegas enters at the bottomof the cylinder, passesup through the suctionvalve in the piston, andby the up stroke of thepiston is compressed anddriven out through thedischarge valve in thecenter of the safety head. The piston and the bottom of the
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectdairyin, bookyear1921
