FARM STORAGES FOR APPLES 



25 



from the second floor being through an opening in the floor shown at C. Dampers 

 regulate the flow of air to the two floors. In many two-story buildings blowers 

 are placed on each floor. The arrangement shown in Figure 15 is to be pre- 

 ferred, even though two blowers are required to carry the load, as it permits 

 throwing the full cooling capacity into whichever room needs it most . It is highly 

 desirable that all the blowers operate whenever the compressor is operating, in 

 order to maintain a relatively high refrigerant temperature and to assure maxi- 

 mum output from the compressor. If a storage is equipped with two blowers 

 and only one is operating at a given time, less refrigerant is available to fill the 

 cylinders of the compressor than if both blowers were operating. This gives low 

 pressure and temperature in the coil and reduces the refrigeration capacity of 

 the machine. 



Figure 13 Arrangement of Air Circulating Equipment for Two-story Apple Storage. 



The air circulation is most efi'ective if no alleys are provided within the room. 

 Alleys parallel to the direction of air travel act as flues, permitting the air to 

 return to the blower with consequent reduction of circulation through the stacks. 

 Where alleys parallel to air travel are necessary, they should be closed with a 

 canvas or sheet of wallboard near the blower. Alle\s crosswise to the direction 

 of air travel act as traps and permit the air to return to the blower without going 

 to the rear of the room. This can be prevented by covering the alleys with 

 canvas or sheets of wallboard. 



When the length of air travel exceeds 40 feet, it is advisable to install one or 

 more ceiling ducts extending about half the length of the room to insure adequate 

 air circulation near the far end of the room. 



Blowers should preferably be placed so that the air travel is parallel to the 

 girders within the rooms, as air currents are deflected when they strike an ob- 

 struction such as a girder. A space of 12 inches should be left between the top 

 box and the ceiling of the room. Boxes should be piled on ^-inch strips laid on 

 the floor to permit air circulation between the floor and the boxes. 



