Dehydration of foods by Gustavo V Barbosa-Cánovas; Humberto Vega-Mercado PDF

By Gustavo V Barbosa-Cánovas; Humberto Vega-Mercado

ISBN-10: 144194723X

ISBN-13: 9781441947239

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20) also applies to non-saturated conditions ranging from zero to saturation. For the nonsaturated state, the term Pwater-sat is replaced by the partial pressure of water (Pwater). 4 kJ/kg of water). Equation (22) can be rearranged by using Eq. 6 Wet Bulb Temperature The adiabatic saturation temperature is attained when large amounts of water carne in contact with the entering gas. 2. Adiabatic saturation chamber. 1 Fundamentals of Air-Water Mixtures 19 tinuous stream of gas under an adiabatic condition, it reaches a steady-state nonequilibrium temperature known as the wet bulb temperature.

92 (Teng and Seow, 1981). Bromlev Equation Bromley's (1973) equation is based on the assumption that Bmx may be approximated as the sum of individual ion B values. 5 a=-- (40) IZmzxl where TI and T 2 are used to simplify Eq. 2 shows some examples ofthe Bromley constants for selected electrolytes. Although less ac curate than Pitzer's equation, Bromley's model is quite effective and could be useful for thermodynamic calculations of electrolyte solutions (Pitzer and Mayorga, 1973). 0574 for the NaCI.

5. Representation ofmoist air properties in the psychrometric chart. 049 kg of H2 0/kg of dry air. 049 kg of H 2 0/kg of dry air until it intercepts the curve for 50% relative humidity, and then reading the temperature which, in this case, is 53°C. Finally, the Twb is obtained by drawing a line that parallels the wet bulb lines until it intercepts the 100% relative humidity curve, and reading the wet bulb temperature which is 42°C. 6 summarizes the above explanation. 2 MIXINO TWO STREAMS OF AIR The use of recycled air during a drying process results in a less expensive operation.

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Dehydration of foods by Gustavo V Barbosa-Cánovas; Humberto Vega-Mercado

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