4 BULLETIN 85, U. S. DEPARTMENT OF AGRICULTURE. 
Table 1. — Results of tests at Jive milk-pasteurizing plants — Continued. 
HEAT BALANCE. 
1 
2 
3 
Heat 
sup- 
plied. 
Heat 
ac- 
count- 
ed for. 
Heat 
sup- 
plied. 
Heat 
ac- 
count- 
ed for. 
Heat 
sup- 
plied. 
Heat 
ac- 
count- 
ed for. 
Heat 
sup- 
plied. 
Heat 
ac- 
count- 
ed for. 
Heat 
sup- 
plied. 
Heat 
ac- 
count- 
ed for. 
Total heat in steam supplied 
to pasteurizer 
P. ct. 
100. 00 
43.86 
P. ct. 
P. ct. 
100.00 
41.00 
P. ct. 
P. ct. 
100.00 
151.87 
P. ct. 

P. ct. 
100. 00 
124. 76 
P. ct. 
P. ct. 
100. 00 
264.27 
P. ct. 
Heat returned by regenerator. 
Heat remaining inliquid (con- 
densed steam) 
14.51 
1.92 
11.79 
43.86 
65.97 
5.81 
14.51 
2.41 
5.09 
41.00 
64.98 
12.98 
14.62 
5.56 
5.38 
151.87 
47.63 
26.80 
14.64 
14.62 
Heat reQuired to raise tem- 
perature of initial cnarge of 
2.91 
124.76 
65.58 
16.87 
12.42 
264.27 
34.39 
38.57 
Heat absorbed in regenerator 
Heat absorbed in cooler in 
reducing temperature to 
that of raw milk 
Loss in radiation, exclusive of 
holder 
Total 
143.86 
143.86 
141.00 
141.00 
251.87 
251.87 
224. 76 
224.76 
364.27 
364.27 
TEMPERATURE BALANCE. 
li 
21 
32 
43 
5< 
°F.. 
63.50 
57.86 
59.40 
54.00 
47.60 
..°F.. 
131.30 
107.50 
124. 10 
..°F.. 
71.90 
53.50 
76.50 
84.00 
60.53 
78.30 
°F.. 
146. 66 
150.40 
145.00 
142.40 
145.30 
°F.. 
82.50 
92.54 
13.70 
34.90 
21.20 
cent 
16.00 
39.47 
21.70 
cent. . 
100.00 
100.00 
100.00 
100.00 
100.00 
146.00 
150.40 
145.00 
142.40 
143.30 
°F.. 
8.00 
4.24 
2.25 
1.33 
3.90 
Per 
cent. . 
9.70 
4.58 
2.63 
1.50 
3.99 
°F.. 
138.00 
146.16 
142. 75 
141.07 
141.40 
..°F.. 
29. 75 
34.16 
63.45 
57.07 
83.00 
cent.. 
36.00 
36.85 
74.12 
64.50 
84.96 
Cooler 
°F.. 
108.25 
112.00 
79.30 
84.00 
56.00 
°F.. 
44. 75 
54.14 
19.90 
30.00 
10.80 
Per cent drop 
per 
cent. . 
54.30 
58.57 
23.25 
34.00 
11.05 
Total per cent drop 
per 
cent.. 
100.00 
100. 00 
100.00 
100.00 
100. 08 
1 Regenerator in heater. 3 Direct expansion coils in cooler. 
2 Surface cooler used as regenerator. 4 Cooled entirely by refrigerated water. 
ECONOMY IN USE OF REGENERATORS. 
Referring to the heat balance for the foregoing plants in which 
regenerators, or heat exchangers, were used, it will be noted that 
in some cases the heat returned by the regenerator is considerably 
in excess of the total amount supplied by the heater. It should 
be borne in mind, however, that this heat is exchanged from the 
hot milk leaving the holder to the cold incoming milk, the heat 
supplied by the steam going to make up the losses; consequently 
the greater the efficiency of the regenerator the less heat is required 
from the steam. The hot milk from the holder is transferred to the 
cooler usually through the inner pipe of the regenerator; consequently 
