Precipitated enzyme is filtered, and the filtered solids are washed and dried before packaging. Washed filter cake containing 10 kg of dry solids and 15 wt% free water, measured on a wet basis, is dried in a tray drier under constant drying conditions. The critical free moisture content is 6 wt% (dry basis). The area available for drying is 1.2 m2. The air temperature in the drier is 35°C. At the air humidity used, the surface temperature (Tw) of the wet solids is 28°C. The heat transfer coefficient (h) is 25 W/m2°C. In the constant rate period, T is the dry-bulb temperature of air and lw is the latent heat of water at Tw. How long (in h) will it take to reduce the free moisture content of the sample to 8 wt% (dry basis)? How long (in h) will it take to reduce the free moisture content of the sample to 3 wt% (dry basis)? Assume that the rate of drying in the falling rate period is a linear function (of X) to the origin.
Precipitated enzyme is filtered, and the filtered solids are washed and dried before packaging. Washed filter cake containing 10 kg of dry solids and 15 wt% free water, measured on a wet basis, is dried in a tray drier under constant drying conditions. The critical free moisture content is 6 wt% (dry basis). The area available for drying is 1.2 m2. The air temperature in the drier is 35°C. At the air humidity used, the surface temperature (Tw) of the wet solids is 28°C. The heat transfer coefficient (h) is 25 W/m2°C. In the constant rate period, T is the dry-bulb temperature of air and lw is the latent heat of water at Tw. How long (in h) will it take to reduce the free moisture content of the sample to 8 wt% (dry basis)? How long (in h) will it take to reduce the free moisture content of the sample to 3 wt% (dry basis)? Assume that the rate of drying in the falling rate period is a linear function (of X) to the origin.
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Precipitated enzyme is filtered, and the filtered solids are washed and dried before packaging. Washed filter cake containing 10 kg of dry solids and 15 wt% free water, measured on a wet basis, is dried in a tray drier under constant drying conditions. The critical free moisture content is 6 wt% (dry basis). The area available for drying is 1.2 m2. The air temperature in the drier is 35°C. At the air humidity used, the surface temperature (Tw) of the wet solids is 28°C. The heat transfer coefficient (h) is 25 W/m2°C. In the constant rate period, T is the dry-bulb temperature of air and lw is the latent heat of water at Tw.
- How long (in h) will it take to reduce the free moisture content of the sample to 8 wt% (dry basis)?
- How long (in h) will it take to reduce the free moisture content of the sample to 3 wt% (dry basis)? Assume that the rate of drying in the falling rate period is a linear function (of X) to the origin.
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