Drying is widely used in a variety of thermal applications ranging from food drying to wood drying. Drying industry utilizes large quantities of energy, making it one of the most energy-intensive industrial operations. Drying processes essentially become heart of industrial systems. The objective of a dryer is to supply the substance with more heat than is available under ambient conditions, thus (i) sufficiently increasing the vapor pressure of the moisture held within the product to enhance moisture migration from within the product and (ii) significantly decreasing the relative humidity
of the drying air so as to increase its moisture carrying capability and to ensure a sufficiently low equilibrium moisture content. Humanity today faces environmental problems spanning a growing range of pollutants, hazards and ecosystem degradations over increasing areas. The most significant problems include global climate change, stratospheric ozone depletion and acid precipitation. The former stems from increasing atmospheric concentrations of greenhouse gases, which trap heat radiated from the earth’s surface.Global climate change raises the surface temperature of the
earth and sea levels, and is potentially the most important environmental problem relating to energy utilization (Dincer, 2002).
Drying is widely used in a variety of thermal applications ranging from food drying to wood drying. Drying industry utilizes large quantities of energy, making it one of the most energy-intensive industrial operations. Drying processes essentially become heart of industrial systems. The objective of a dryer is to supply the substance with more heat than is available under ambient conditions, thus (i) sufficiently increasing the vapor pressure of the moisture held within the product to enhance moisture migration from within the product and (ii) significantly decreasing the relative humidityof the drying air so as to increase its moisture carrying capability and to ensure a sufficiently low equilibrium moisture content. Humanity today faces environmental problems spanning a growing range of pollutants, hazards and ecosystem degradations over increasing areas. The most significant problems include global climate change, stratospheric ozone depletion and acid precipitation. The former stems from increasing atmospheric concentrations of greenhouse gases, which trap heat radiated from the earth’s surface.Global climate change raises the surface temperature of theearth and sea levels, and is potentially the most important environmental problem relating to energy utilization (Dincer, 2002).
การแปล กรุณารอสักครู่..