FARM STORAGES FOR APPLES 23 



Cooling Water 



The heat removed by the refrigeration equipment is finaih carried away by 

 the cooling water. Where the water is allowed to go to waste after flowing through 

 the condenser and the compressor, at least 2 gallons of water per minute per ton 

 of refrigeration capacity is required. When this amount of water is not available, 

 it will be necessary to cool the water after it comes from the condenser for re- 

 circulation. This can be done by spraying it into a pond or into a spray tower. 

 The spray brings the warm water in contact with the air and permits some of 

 the water to evaporate. This serves to cool the remainder. The degree to which 

 the water is cooled depends upon the effectiveness of the spiay nozzles and the 

 temperature and relative humidity of the air. The spray system is most effective 

 on clear, cool days; but if the spray tower is of ample size, it will give satisfactory 

 service even on warm, muggy days. It is customary to circulate 5 gallons per 

 minute per ton of refrigeration load when a spray towei is used. 



Figure 13. Cooling Tower. 

 Concrete curb and floor witii wooden louvers. Two spray nozzles. 



Where a limited amount of water is available, an evaporative-type condenser 

 is sometimes used. Condensers of this type aie built like an automobile radiator, 

 and a spraj' of water is thrown aga inst the outside of the condenser. The evapora- 

 tion of some of this water serves to cool the refrigerant. 



Cooling Equipment within the Storage Room 



Until recent years cooling systems in apple storages were evaporating coils 

 over which the air moved by natural circulation. These coils are usually made 

 up so as to extend practically the whole length of the room, but there are various 

 ways in which the coils may be arranged. In narrow rooms coils are placed on the 

 two long walls, with a number of pipes placed one above the other. In wider 



