March, 1928] Electric Dairy Cold Storage 21 



Two lumdred and forty quarts is the average daily amount of milk 

 stored on Farm No. 4 or 87,000 quarts per year; and, as stat^ed before, 

 40 cows are considered to prothice tlie total milk handled. Part of 

 the morning's milk is precooled, bottled and delivered without going 

 into storage, and the total milk handled is about 300 quarts per day. 

 Only the quarts of milk stored are considered. The figures include the 

 cost of refrigeration for the household, as this is a combination cold 

 storage for dairy and house, and the actual cost per 100 quarts of 

 milk and per cow would be less if used for the dairy only. 



The figures for 1926 represent 9 months' operation. The compara- 

 tively low cost for current on Farm No. 4 is due largely to the favor- 

 able rate. (See Table 4 and New Hampshire Experiment Station Bul- 

 letin 228.) 



The figures for 1927 on this farm show the increase in current used 

 when twelve months operation is carried on. This particular farm is 

 inclined to operate on a twelve months basis at present. 



While Farm No. 1 handles about 300 quarts of milk and cream per 

 day, only about 150 cjuarts are jilaccd in the storage. Morning's milk 

 is precooled, bottled and delivered without having reached the storage. 



The results shown in the table resemble those obtained for Farm No. 

 4, both of which are less than for Farm No. 2, where about 300 quarts 

 jier day were stored. The cost per quart decreases with the number of 

 quarts stored which would appear to substantiate the belief that if 

 properly precooled the amount of milk placed in storage does not affect 

 the current consumption greatly. 



Test of Current Requirements. Four operating conditions were in- 

 cluded in a test of the current requirements of the equipment in the 

 fall of 1927. The results are given in Table 9. 



Line voltage, gas pressures and temperatures were taken before start- 

 ing. At the instant of starting the motor, the highest readings reached 

 were taken to secure the maximum starting demand. No account was 

 made of the damping effect of the meter. After the equipment had 

 settled to a steady pace readings for average nmning conditions were 

 taken, and just before the thermostat threw off the current, another set 

 to note any increase in demand as the gas pressures changed. 



From the above test it appears that the motor on Farm No. 2 is 

 drawing 2.4 amperes which is less than its maximum capacity and in- 

 sures cool running. 



The motors on Farms No. 4 and No. 1, however, are continuously 

 drawing .75 and .9 amperes over their rating witli the result that they 

 heat slightly, indicating that % H.P. motors should be used. 



The higher of the two cold storage temperatures on Farm No. 4 is 

 taken at a midpoint in the height of the room, and the lower one at a 

 l)oint 2 inches from the floor. 



The figures for outside air in the case of Farai No. 1 are for the 

 dairy room into which the cold storage opens. 



Operating Characteristics of a Cold Room. Figures 7 to 13 give 

 graphically the 1926 season's run of refrigerator equipment on Farm 

 No. 4. They are based on readings taken three times each day, 4 A. 

 M., 12 noon and 6 P. M. The complete data, which are too bulky to 



