短粒型稻谷热容的实验测定

热容是稻谷的重要热物性参数,被广泛应用在干燥工艺设计和干燥过程的计算机模拟中。稻谷的热容不仅受其含水率的影响,还受其品种甚至产地的影响。该研究根据混合测定法原理,用磁力搅拌式水卡计、电位计以及数字温度计等,组成一套测定装置,对我国南方产短粒型稻谷的热容进行测定,着重研究了稻谷的含水率对热容的影响。根据测定结果,通过回归分析的方法,建立起短粒型稻谷的热容随着含水率变化的数学方程。分析结果表明,利用此方程来计算不同含水率短粒型稻谷的热容,比利用国外的经验计算公式计算得到的数值具有更高的准确度。

Determination on heat capacity of short paddy grain

The heat capacity, an important thermal characteristic parameter of the paddy grains, was widely applied to the design of drying technology and the computer simulation of dry procedure. Except for the moisture and temperature, the breed even the growing area of paddy grain had an effect on its heat capacity. In this paper, in accordance with the mixed method, a measuring system, which consisted of a hydrothermograph with magnetic force agitator, a potential difference meter and a digit thermoammeter etc., were used in the determination of heat capacity of short paddy grain growing in the south China, with a special attention to the influence of moisture content upon the heat capacity of rough rice. In addition, based on the experimental data, the relationship between the heat capacity of short paddy grain and its moisture content was found to be described as a linear equation by means of regression statistics. Further study shown that the equation worked better than the other known equations from overseas in prediction of heat capacity of the short paddy grain with different moisture contents.