Energy Evaluation Method of Grain Drier (1)

Equilibrium Moisture and Enthalpy Equations of Rice in consideration of Moisture Concetnration Energy

Abstract

To establish a method of energy evaluation of grain drier in consideration of moisture concentration energy, the author measured and arranged the fundamental thermal properties of rough rice and proposed new equations of enthalpy and equilibrium moisture content of rough rice.
1. Thermodynamic relations between specific heat, heat of wetting, equilibrium moisture content and enthalpy of grain were discussed.
2. Specific heat of dry matter of rough rice was measured and arranged (Table 1-1).
3. Equilibrium moisture content of rough rice (Nihonmasari) conditioned by saturated salt solution method was measured (Table 1-2). From the data, the coefficients of Strohman and Yoerger equation were obtained by Othmer method and this equilibrium moisture content equation of rough rice (eq. 1-28) was fit for a wide range of temperature and humidity.
4. Heat of wetting of rough rice was obtained by Othmer method. The data were compared with those of previous studies and discussed (Fig. 1-5), and equation of heat of wetting (eq. 1-26, 27) was obtained.
5. Enthalpy equation of rough rice (eq. 1-29) was obtained in consideration of heat of wetting which is based on moisture concentration energy. By this equation, the enthalpy-moisture concentration diagram of rough rice (Fig. 1-6) was drawn up.