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Grain Drying Process and Equilibrium Moisture Properties

Learn about heating, cooling, wetting, drying, humidifying, and dehumidifying of grain. Understand the impact of temperature and moisture content changes. Discover equilibrium moisture properties and relative humidity effects on grain storage.

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Grain Drying Process and Equilibrium Moisture Properties

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  1. Lecture 4

  2. Other factors to consider • Heating & Cooling of the grain • Same process as long as the temperature stays above the dewpt. An assumption is made that any change in temperature is assumed to occur with a change in moisture content

  3. Other factors to consider • Wetting & Drying • Occurs under essentially constant heat conditions • Water vapor is either added or removed without any change in the heat content of the air (Figure 2.6)

  4. Heating & Humidifying • Both the dry bulb temp & the humidity ratio Increase. • Similar to passing through a livestock shelter • Cooling & Dehumidifying • Both the dry bulb temp & the humidity ratio decrease • Similar to air that passes through an air conditioner

  5. Equilibrium Moisture Properties • Grain is hygroscopicequilibrium moisture content (EMC) contstant enviromental cond. • Equilibrium Relative Humidity (ERH) all changes are a function of temperature • See table 2.5

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