. Cold storage for apples and pears. Apples Storage; Pear Storage; Cold storage. The humidity, or moisture content, of the atmosphere in a storage room depends largely upon the temperature to which the air is cooled in contact with the pipes or the brine. If doors are left open in warm weather, the warm air entering the storage may be a source of moisture, but the frost on the pipes or the overflow in the brine tank is largely from water vapor transpired by the fruit. It is desir- able to keep this transpiration at a minimum by main- taining a relative hu- midity of approxi- mately 85 percent.
. Cold storage for apples and pears. Apples Storage; Pear Storage; Cold storage. The humidity, or moisture content, of the atmosphere in a storage room depends largely upon the temperature to which the air is cooled in contact with the pipes or the brine. If doors are left open in warm weather, the warm air entering the storage may be a source of moisture, but the frost on the pipes or the overflow in the brine tank is largely from water vapor transpired by the fruit. It is desir- able to keep this transpiration at a minimum by main- taining a relative hu- midity of approxi- mately 85 percent. This may be done by limiting the quantity of water picked up on the coils or in the spray. Some water in the form of gas or va- por is contained in the atmosphere. The lower the tempera- ture, the less the quan- tity of vapor that can be held. As the tem- perature of the air drops, a point is fi- nally reached at which some of the wa- ter can no longer exist as vapor and it con- denses to form water or frost. The greater the temperature drop, the greater the conse- quent condensation. It is important, therefore, to operate without reducing the air temperature lower than necessary. In an air-circulation system, this is done by using large quantities of air and plenty of cooling surface. If too little air is used, its temperature must be reduced greatly and excessive condensation will occur. If there is not enough coil surface in a direct-expansion system the pipes will have to be extremely cold and the air coming in contact with them will lose a large part of its moisture. Contrary to common belief, a brine spray, when used for cooling, does not add humidity to the air. On the other hand, it tends to pick up moisture. For this reason some of the brine must be. Figuee 6.—A unit cooler in which the cold air is distributed from nozzles at the top of the room and the warm air is returned from the floor. With such installation, air is not returned from the warmest areas of the roo
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