1. Physical and chemical properties of materials - morphology, moisture content, water content, crystal water, particle size, bulk density, viscosity, thermal sensitivity, softening point, phase transition point, thixotropy, toxicity, corrosiveness, odor, flammability, explosiveness, electrostatics, breathability, agglomeration, and easy pulverization of crystals or particles.

2. Drying characteristics of materials - drying curve, critical moisture content, and equilibrium moisture content under the selected drying conditions.

3. Dry production requirements and long-term planning.

4. The impact of material commodity value and drying effect on it. The impact of factors such as product moisture, pollution, temperature, wear and tear, pulverization, pulverization, and rehydration on product value.

5. Requirements for material recovery rate.

6. The top-down process of material drying.

7. Drying methods for materials in the past or similar products.

8. Available heat sources (coal, fuel oil, electricity, coal gas, liquefied gas, natural gas).

9. Is there any special requirement for the size of the installation site.

10. Environmental requirements - for dust emissions, noise, vibration, odors, and volatile substances The limitations of... etc.

11. Possible amount of procurement funds, local labor, land, and energy prices.

12. User's operator level and maintenance ability.