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Environmental and Functional Engineering of Agricultural by H. J. Barre, L. L. Sammet, G. L. Nelson (auth.)

By H. J. Barre, L. L. Sammet, G. L. Nelson (auth.)

This publication has been written as a textbook for college kids looking a qualified measure in agricultural engineering. The authors think that for college students with this aim the process examine might be essentially analytical, instead of descriptive, and that the analytical process should still follow not just to rules but in addition to quantitative tactics and computations. We realize that sound research, quite in utilized fields, relies at the realizing of theoretical rules and on wisdom of many functional issues. we now have attempted to take care of a great stability among the education of idea and perform, yet we prefer emphasis of theoretical concerns at the foundation that and they will not be mastered other than in an equipped process research, while sensible wisdom is extra simply assimilated. to provide either thought and perform makes heavy calls for on category time and textbook area. accordingly it's been attainable to regard intimately just a couple of usual environmental platforms for cattle housing and storing agricultural items as a method of illustrating equipment of research and the applying of ideas. it really is presumed, even though, that such examine will arrange the scholar for paintings with different forms of structures.

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Sample text

The thennodynamic wet-bulb temperature of air can be measured closely by a psychrometer, a device that includes dry- and wet-bulb thennometers. The latter has a wicklike covering kept thoroughly moistened with water. When the thennometer is in a stream of air, water evaporates from the wick, accompanied by cooling of the bulb inside the wick. This evaporation and cooling process is not adiabatic, but due to fortuitous circumstances, the wet-bulb temperature is very close to the thennodynamic wet-bulb temperature, and corrections, if any are needed, are small.

3 Psych rometrics AIR-WATER VAPOR MIXTURES One of the most persistent and difficult problems in agricultural building design is the control of moisture. In livestock shelters large quantities of moisture in expired air must be removed continuously. In crop storage it may be necessary to remove excess moisture from the crop quickly to prevent spoilage, as with hay and grain; or it may be imperative, for the same reason, to hinder the escape of moisture, as in fruit and vegetable storage. We may find it necessary during the heating season to add moisture to the atmosphere in dwellings to improve comfort, or in other structures to reduce the amount of moisture in the air to prevent condensation on building surfaces.

Heat is supplied to a 40 ft x 60 ft concrete floor, 6 in. thick, at the rate of 40,000 Btu/hr. What time is required to raise the floor temperature 50°F, neglecting losses to ground and surroundings? 2. Determine the heat transfer mte through the walls of a concrete silo 12 ft inside diameter and 20 ft high, subjected to a constant temperature difference of 70°F. The wall is 8 in. thick. Disregard the heat loss through the floor and roof. 3. 2 is filled with water at a temperature of 60°F. What is the time required for cooling the water to 35 OF when the ambient air temperature is 20°F?

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