Bulletin - Washington (State). State University, Pullman. Engineering Experiment Station Volume 7-21 (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1921 Excerpt: ...the apples, is raised an average of 4." The amount of air required then will be % of 627,000,000 or 156,750,000 cu. ft. If a fan is installed which delivers 20,000 cu. ft. of air per minute, and the outside air temperatures are such that cooling can be accomplished only during 10 hours of each night, the amount of air handled per night will be 12,000,000 cu. ft. Then the time required to handle the total amount of air necessary to cool the above lot of apples will be 156,750,000-12,000,000=13 nights. During this time there will undoubtedly be a slight warming up each day due to the higher temperature prevailing in the middle of the daytime, but this is very small when the quantity of fruit is large. Also the night time temperatures will not be uniformly low--some nights perhaps being too warm for the fan to be operated at all, and other nights being even cooler than the average. Therefore, it is evident that the number of nights necessary to accomplish the required cooling might easily exceed the above stated number. It will also be true that when very warm apples are brought in from the orchard and stored immediately in a fan cooled house, the air forced through them the first night will be raised several degrees in temperature, so that a comparatively small amount of air will effect a great amount of cooling. This is fortunate and desirable as shown in Fig. 1 and Fig. 2, since it is highly important to secure a large and rapid initial cooling to check the ripening process as soon and as much as possible. This rapid cooling when the apples are warm is shown in Fig. 5. Small Window Fans Not Effective The above figures will show the futility of attempting to accomplish any material cooling of a storage house full of boxed apples by the use of a propelle...