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Factors to consider when selecting a drying device: 1. Physicochemical properties of the material–shape, moisture content, nature of moisture, crystalline water, particle size, bulk density, viscosity, heat sensitivity, softening point, phase transition point, thixotropy, toxicity, corrosiveness, odor, flammability, explosivity, static electricity, air permeability, agglomeration tendency, and ease of crushing of crystals or particles... 2. Drying characteristics of the material–drying curve under the proposed drying conditions, critical moisture content, and equilibrium moisture content. 3. Requirements for dry production volume and long-term plans. 4. The impact of the value of the materials and products as well as the drying effect on them. Such as the impact of product moisture, contamination, temperature, wear, pulverization, crushing, rehydration capacity, etc., on the value of the product. 5. Requirements for material recovery rate. 6. The sequential processes in the material drying process. (Methods related to the status of feeding and discharging materials) 7. Past drying methods for the material or similar products. 8. Available heat sources (coal, fuel oil, electricity, gas, liquefied gas, natural gas). 9. Size of the installation site and any special requirements. 10. Environmental requirements--Restrictions on dust emissions, noise, vibration, unpleasant odors, volatile substances, etc. 11. Potential amount of capital to be invested in procurement, local labor, land, and energy prices. 12. The skill level of the user’s operators and their maintenance capabilities. 13. Local annual average temperature and humidity.