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refrigeration capacity minus the fixed loads calculated for heat transmission 

 into the storage and heat generated by fans and pumps operating in the storage. 

 Total refrigeration capacity has been calculated from the displacement of 

 compressors installed and the operating pressures prevalent during the receiving 

 season. 



The load for cooling packed boxes has been estimated at 8 tons of 

 refrigeration per 1,000 boxes entering the storage per day. This figure 

 allows approximately 25 percent for air infiltration and heat from lights, 

 men, and equipment, which are assumed to be proportional to the receiving 

 activity. This figure is based on fruit being cooled from 65° F. to 32*^ Fo 

 and includes the respiratory heat given off by the fruit if 6 days were 

 required for cooling through this range. These same assumptions were used in 

 calculating the total cooling capacity of the district in 1941. 



In 1941, it was assumed that when fruit was cooled before packing, it 

 would be cooled for only a few days and then withdrawn from storage, packed, 

 and placed back in storage during the normal receiving season. This meant 

 that cooling before packing would involve some penalty for cooling culls and 

 for the warming of fruit that takes place during packing. In the 1941 survey, 

 when fruit was cooled before packing, the load was estimated at 10 tons of 

 refrigeration per 1,000 packed boxes. 



The current situation with respect to loose fruit is quite different. 

 The percentage of culls is normally very low. Most loose fruit that goes 

 into storage is not withdrawn for packing until after the receiving season, 

 since plenty of space is available for holding it loose, and, from a handling 

 standpoint, it is most efficient to pack as much fruit as possible directly 

 from the field. Neglecting culls and figuring only the cooling required for 

 loose fruit, the load per 1,000 loose boxes received is 5.3 tons of 

 refrigeration. 



Part of the cooling capacity is devoted to cooling fruit that has been 

 packed as it comes from the field, and some uncertainty exists regarding the 

 effect of culls on the ultimate capacity. Also, the production figures for 

 the various shipping areas are available in terms of packed boxes. This 

 analysis therefore is simplified by judging cooling capacity on the basis of 

 the capacity to cool packed fruit. With no cullage, this assumption actually 

 requires 16 percent more cooling capacity than would be the case if all fruit 

 were cooled loose and packed after the receiving season. This is based on the 

 assumption that 1,300 loose boxes pack out to 1,000 packed boxes and the 

 cooling load is 5.3 tons and 8.0 tons per 1,000 boxes, respectively. There- 

 fore, the refrigeration required is 1.1 tons greater for the 1,000 packed 

 boxes than for the 1,300 loose boxes. Inasmuch as the actual operation of 

 the storages is that of receiving both packed and loose fruit, the allowance 

 for variations in amounts involved in the analysis used is about 8 to 10 per- 

 cent. 



These data can throw some light on three important questions: 



