After the process of making pellets, the temperature of the biomass is in the range of 60-80 degrees with a moisture content of about 15% that is after using a pellet making machine. But you cannot store pellets in this condition nor pack them. It is simply not advisable. The chief reason against such actions is the high temperature of the pellets. If pellets were to be packed in this condition, then a high temperature insulation material would be needed for packing and storing of these pellets which would contribute to an increase in cost, defeating the whole purpose of making the pellets in the first place. To avoid all this, pellet cooling process can be used to bring down the temperate of pellets prior to storage.
This process ensures that pellets do not clumber owing to the high temperatures and moisture content after the pelletizing process and also the pellet cooling process helps avoid condensation of the pellets and formation of mildew. A cooler is used to bring down the temperature of pellets by about 3-4% as well as the moisture content. To do this a counter flow cooler is preferred by most people and commercial facilities since the cooler blows air through columns of pellets in the opposite direction of the flow of the pellets. This makes the evaporation process faster as well as the cooling process. The counter flow cooler also dispenses the pellets automatically making the whole process efficient and less reliant on supervision. You can find a variety of these counter coolers on sale either from leading suppliers or through the internet.