What is drying precisely?
Drying is to evaporate liquid such as water or solvent included in materials by heating.
Incidentally, 2540J (J=joules) of heat is necessary to evaporate 1g (g=gram) of water at temperature of 20°Celsius (68°Fahrenheit) and 1 atmospheric pressure.
By converting this to time, 0.039g of water can be evaporated every 1 second in case that there is no heat loss. (100÷2540＝0.039g)
It is possible to dry 0.039g of water in 1 second by adding 100J/S (100W) of heat to water.
Also, 2540J/S (2540W) of heat is necessary to dry 1g of water per 1 second.
Please be noted that the condition of the above calculation is at temperature of 20°Celsius (68°Fahrenheit) and 1 atmospheric pressure.