Abstract: Although drying takes a significant part of the total energy usage in industry, currently available drying technology is often not efficient in terms of energy consumption. Generally, the energy efficiency for drying processes ranges between 20 and 60% depending on the dryer type and product to be dried. The high energy consumption and low energy efficiency have a high environmental impact due to combustion of fossil fuel or wood used as energy sources. Moreover, the sources of fossil fuel are limited, the prices for energy increase, and the worldwide industrial energy usage rises. In this context the development of efficient drying methods with low energy consumption is an important issue for research in drying technology.
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