Z33 



8 New Hampshire Experiment Station [Bulletin- 



Amount of "" 



Product: As used is considered to be able to cany an average of 300 

 quarts of milk in bottles per day. 



Farm No. 2. Has carried a maximum load of 400 quarts 

 of whole milk and cream in bottles and cases. 

 Farm No. 4. Has carried 420 qts. of whole milk and cream 

 at 50° against 90° outside temperature as a maximum load. 

 Farm No. 1- 125 to 150 quarts has been the average load. 



Method of Handling Milk. On all three farms the milk is precooled 

 by running it over surface coolers which are chilled by cold well water. 

 Water temperatures vary, but occasional tests indicate that the milk 

 is reduced to about 60° -65° temperature or better, under favorable 

 conditions. The milk is then bottled and placed in storage. 



On Farm No. 4 it was found that 48.6% of the total day's milk goes 

 into storage before 7 A.M., 31% about noon, and 20.4% around 7 P.M. 

 The average quantity of milk at these hours is 116, 190 and 240 quarts 

 respectively, the last being the average quantity held over night and 

 the total for the day. 



This method of operation, which is representative of conditions on 

 the other farms, requires the most current in the morning and least as 

 night comes on. The task of holding the entire load overnight is not 

 believed to require much current as most of the milk has by that time 

 been well chilled and must simply be held so. This Avould substan- 

 tiate the original belief that the dairy cold storage is largely a daylight 

 electric load. 



Initial Investment for Electrical Refrigeration. The initial invest- 

 ment in equipment for the three farms is given in Table 2. In the 

 lower half will be found the interest and depreciation charges, i.e., the 

 annual fixed expenses. 



Current Consumption and Costs of Operation. Readings for 1924, 

 1925, 1926 and 1927 are given in Table 3 on a monthly basis. All 

 equipment is operated on separate power or heating circuits which pro- 

 vide a somewhat lower rate if sufficient quantity of current is used. 

 For average rate see Table 4, also New Hampshire Experiment Station 

 Bulletin 228. 



Refrigeration ■ is usually started sometime in March, or April, de- 

 pending on outside temperatures, where operations are not on a year- 

 round basis, and is usually discontinued in the latter part of Novem- 

 ber. Through the winter months when natural outside temperatures 

 are used, care must be taken that products do not freeze. 



The months of May, November and December are representative of 

 minimum operating expense conditions. The average monthly con- 

 sumption throughout the year varied from 95 to 135 kwhs. with an 

 average of 109 kwhs. The average monthly costs ranged from $3.94 

 to $7.56, with an average of $5.79. 



The maximum consumption occurs usually in August but may also 

 fall in July or September. The lowest maximum was 158 kwhs., the 

 highest 230 kwhs., and the cost of operation varied from $6.51 to 

 $14.00. The average maximum was 184 kwhs. and $9.82. 



The annual cost is seen to vary from $35.13 when 772 kwhs. were 



