300 MARKET DAIRYING 
of controlling the temperature during the warm summer 
months. 
The brine is kept circulating by means of a brine pump. 
Strength of Brine. The brine is usually made from 
common salt (sodium chloride). The stronger the brine 
the lower the temperature at which it will freeze. Its 
strength should be determined by the lowest temperature 
to be carried in the brine tank. The following table from 
Siebel shows the freezing temperature as well as the 
specific heat of brine of different strengths: 
Pounds of ‘ . 
Percentage o¢ salt by weight. seneder Pras eae 
solution. 
Asis area brain ini sielonetenes eras ecu'avovererad:suasdiees 0.084 30.5 . 992 
Didara Sera earsias Simieve escisch o ndaieye.ceausvensieie 0.169 29.3 . 984 
ucts re iu tee eitueidla Oey Sh Saeie ae eae eeais 0.256 27.8 976 
As a aprsavns tee sais sean arate + niseieeeraeie's 0.344 26.6 - 968 
Orrin se amie acti aes its emieeentis 5 0.523 23.9 946 
Bi coca citrate Geaselanaiasinters Sis aimee elena aes 0.708 21.2 919 
NO), sees ea ncraietevaselevetace saieia e hersrnmioceci em 0.897 18.7 .892 
HS scene ai cei Rorautsinsaioss cvatia/suaincohnelate e-8s 1.092 16.0 874 
LS sroraraypeioheletserlaieies sists miereisicarnoe 1.389 12.2 855 
AO reid ah cine ieteialse wear oe Aeiara ee nes sie 1.928 6.1 .829 
Deiat state tle Seater siavayaitaa’ abel d.g ppacieeotnrataiaed 2.488 0.5 - 783 
ZO ses a aia aie aiciaraiers) a Sieseeri telesales 2.610 -1.1 TU 
The fact that the specific heat grows less as the brine 
becomes stronger shows it to be wise not to have the 
solution stronger than necessary, because the less the 
specific heat the less heat a given amount of brine is able 
to take up. 
Refrigerating Capacity. When speaking of a machine 
of one ton refrigerating capacity, we mean that it will 
produce, in the course of twenty-four hours, the amount 
of cold that would be given off by one ton of ice at 32° F. 
