BULLETIN 85, U. S. DEPARTMENT OP AGRICULTURE. 



Table 1. — Results of tests at Jive milk-pasteurizing plants — Continued. 

 HEAT BALANCE. 





1 



2 



3 



4 



5 





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 



P. ct. 



100. 00 

 43.86 



P. ct. 



14.51 



1.92 

 11.79 



43.86 



65.97 

 5.81 



P. ct. 



100. 00 

 41.00 



P. ct. 



14.51 



2.41 

 5.09 



41.00 



64.98 

 12.98 



P. ct. 

 100. 00 

 151.87 



P. ct. 



14.62 



5.56 

 5.38 



151.87 



P. ct. 



100. 00 

 124. 76 



P. ct. 



14.64 



P. ct. 



100.00 

 264. 27 



P. ct. 



Heat returned by regenerator. 

 Heat remaining inliquid (eon- 



14.62 



Heat required to raise tem- 

 perature of initial cnarge of 













2.91 

 124.76 



65.58 

 16.87 





12.42 



Heat absorbed in regenerator 





264.27 



Heat absorbed in cooler in 

 reducing temperature to 







47.63 

 26.80 



34.39 



Loss fn radiation, exclusive of 





38.57 









Total 



143.86 



143.86 



141.00 



141.00 



251.87 



251.87 



224. 76 



224.76 



364.27 



364.27 







TEMPERATURE BALANCE. 



Raw milk °F. 



Regenerator °F. 



Rise in regenerator °F . 



Per cent rise per cent. 



Heater °F. 



Riseinheater °F. 



Per cent rise per cent. 



Total per cent rise per cent. 



Holder °F. 



Drop in holder °F. 



Percent drop per cent. 



Regenerator °F . 



Drop in regenerator °F. 



Per cent drop percent. 



Cooler °F. 



Drop in cooler °F . 



Per cent drop per cent. 



Total per cent drop per cent. 



63.50 



146.00 

 82.50 



100. 00 



146.00 

 8.00 

 9.70 



138.00 

 29.75 

 36.00 



108.25 

 44.75 

 54. 30 



100.00 



57.86 



150. 40 

 92.54 



100. 00 



150.40 

 4.24 

 4.58 



146.16 

 34.16 

 36.85 



112.00 

 54.14 

 58.57 



100.00 



59.40 

 131.30 

 71.90 

 84.00 

 145.00 

 13.70 

 16.00 

 100.00 



145.00 

 2.25 

 2.63 



142. 75 

 63.45 

 74.12 

 79.30 

 19.90 

 23.25 



100.00 



54.00 

 107.50 

 53.50 

 60.53 

 142.40 

 34.90 

 39.47 

 100.00 



142.40 

 1.33 

 1.50 



141.07 

 57.07 

 64.50 

 84.00 

 30.00 

 34.00 



100.00 



47.60 



124. 10 



76.50 



78.30 



145.30 



21.20 



21.70 



100.00 



143.30 

 3.90 

 3.99 



141.40 

 83.00 

 84.96 

 56.00 

 10.80 

 11.05 



100.00 



1 Regenerator in heater. 



2 Surface cooler used as regenerator. 



3 Direct expansion coils in cooler. 



* 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 



