Calorimetric determination of the specific heat of soybeans

Authors: Watts, K. C. And W. K. Bilanski
Description: Soybeans have the potential of being an important livestock feed. They give high yields and have a high protein content. However, inherent in raw soybeans is a chemical compound called a trypsin inhibitor (1) which causes indigestion and has other ad verse effects on simple-stomach animals. The usual commercial method of breaking down this compound uses super-heated steam in special processing plants, although a new process using L.P. gas has been patented. However, a process that could be implemented right on the farm would save livestock producers both time and money. One of these methods involves the use of a microwave oven. It is necessary to heat the beans to some specific internal temperature, dependent on the animal being fed. However, temperature determination is very difficult in a microwave field thermocouples and mercury thermometers are subject to corona discharge, alcohol thermometers burst, and waxes (although they are not affected by microwaves) first go through a plastic stage and then liquify due to the heat from the beans with which they are in contact. Other solutions included switching off the microwaves and then inserting a temperature-measuring device into the beans, or, secondly, removing a number of beans and determining their bulk temperature by a calorimetric method. The first alternative required an assumption concerning the thermal resistance between the temperature - measuring device and the beans. Due to the ellipsoidal shape of the beans, it was decided that the error due to the virtually point contact between the beans and a temperature-measuring device could not be determined to any degree of precision. Hence, this alternative was set aside in preference to the second, which assumed a knowledge of the specific heat of soybeans for the particular moisture content and temperature range.
Keywords: calorimetric determination of the specific heat of soybeans
Citation: Watts, K. C. and W. K. Bilanski 1970. CALORIMETRIC DETERMINATION OF THE SPECIFIC HEAT OF SOYBEANS. Canadian Agricultural Engineering 12(1):45-47.
Volume: 12
Issue: 1
Start page number: 45
End page number: 47
Date: 1970
Coverage: Canada
Located in: Volume 12 (1970)

We have extra copies!

We have extra hard copies of CBE Journal

Volume 56 (2014)
Volume 57 (2015)
Volume 58 (2016)

Available at only 60 CAD each (including shipping).

Please contact John Feddes at manager@csbe-scgab.ca  to place your order.

Search a publication

Search for:
Find entries that have:
Publication type: