Energy and exergy balance methodology. Wood chip dryer

On the basis of the results of the study it can be concluded that under the given assumptions drying process energy efficiency varies between 22.69 % and 10.25 % but the exergy efficiency varies between 16.47 % to 0.7 %. Decrease of drying air mass flow increases the energy and exergy efficiency. This is because less heat is required to heat drying smaller air mass flow. Decreasing drying air humidity ratio of air before dryer, increases energy and exergy efficiency. This is because the drying air with smaller humidity ratio content are able to attract more moisture from the drying product.