14 N. H. Agri. Experiment Station [Bui. 244 



the equipment considerable apprehension. Undoubtedly, the method 

 of using white pine in the construction of this unit had more merit than 

 was at first thought, but the unusually good results obtained are largely 

 due to location. Both the refrigerator and compressor are situated in 

 very cool and protected places. 



The same make and size of mechanical equipment was used in No. 6 

 placed in a well insulated refrigerator. The refrigerator was located in 

 a reasonably waim kitchen and the compressor unit was put in a cool 

 entry. These two examples show that location is as important in the 

 reduction of costs of operation as the quality of the refrigerator or cold 

 storage cabinet. The advantage of cool surroundings may not be of 

 sufficient value, however, to justify the sacrifice of a convenient location. 



No. 7 and No. 1 are different makes of machines, but both, similar to 

 No. 6, operate in a dining room or kitchen in house temperatures 

 throughout the year. Both compressor units are of the self-contained 

 type and work under the same conditions. 



The average for the four strictly household units is .0055 kwhs. per 

 cubic foot of total box capacity per hour. The extreme limits are .003 

 and .008. The high current consumption of No. 1 is believed to be due 

 largely to the increased electrical demand of frequent starts. The op- 

 eration of this machine is characterized by frequent short periods of 

 running. 



Evidence points to an increase in efficiency with an increase in size of 

 refrigerator. (Table VI). 



Table VI. Kilowatt hours per cubic foot of total box capacity per hour: 

 Farm No. 



1 

 6 

 5 



7 

 2 



Since location, environment, and varying efficiencies of different types 

 of compressor units have an effect, a conclusion cannot be positively 

 drawn from these data. 



The greatest amount of electric energy was registered in July, August 

 or September. One hundred kilowatt hours was the largest amount re- 

 corded. Ten kilowatt hours was the lowest reading for a full month. 



The average amount consumed by all except No. 4 varied from 28 

 kwhs. per month to 49 kwhs. The average for all months was 41 kwhs. 

 Daily averages varied from .7 kwhs. to 2.4 kwhs.; 1.4 kwhs. was the 

 average for all days. The maximum consumption for a year was 514 

 kwhs.; 151 kwhs. per year was the least; and 395 kwhs. was the average 

 for all machines. 



Figure 8 shows the power consumption curves on six farms. The 

 1927 curve includes records for a complete year as well as the readings 

 for Farm No. 2 taken in 1925; and the curve marked 1926 includes the 

 readings for the j^ear 1924 for this same fann. The curves are the av- 



