A food product, having a dry weight of 30 kg is dried in a tunnel dryer. Drying was from top surface only having an area of 2 m2. The following data were obtained during the drying process: Drying time (hour) Sample weight (kg) 0 50.0 1 48.5 2 47.0 3 45.5 4 44.0 5 42.8 10 36.9 15 33.8 20 32.9 The air used in the dryer is conditioned by first cooling outside air (20 °C, 40% RH) to 0°C and then heating to 50°C before passing through the dryer. Air flows parallel to the product surface through the dryer having cross sectional dimensions of 150 cm X 100 cm. Calculate: Determine the drying rate in kg H2O/m2.s during the constant rate period. Humidity ratio, wet bulb temperature and the mass flow rate (kg air/s) of the air entering to the dryer
A food product, having a dry weight of 30 kg is dried in a tunnel dryer. Drying was from top surface only having an area of 2 m2. The following data were obtained during the drying process: Drying time (hour) Sample weight (kg) 0 50.0 1 48.5 2 47.0 3 45.5 4 44.0 5 42.8 10 36.9 15 33.8 20 32.9 The air used in the dryer is conditioned by first cooling outside air (20 °C, 40% RH) to 0°C and then heating to 50°C before passing through the dryer. Air flows parallel to the product surface through the dryer having cross sectional dimensions of 150 cm X 100 cm. Calculate: Determine the drying rate in kg H2O/m2.s during the constant rate period. Humidity ratio, wet bulb temperature and the mass flow rate (kg air/s) of the air entering to the dryer
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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A food product, having a dry weight of 30 kg is dried in a tunnel dryer. Drying was from top surface only having an area of 2 m2. The following data were obtained during the drying process:
|
Drying time (hour) |
Sample weight (kg) |
|
0 |
50.0 |
|
1 |
48.5 |
|
2 |
47.0 |
|
3 |
45.5 |
|
4 |
44.0 |
|
5 |
42.8 |
|
10 |
36.9 |
|
15 |
33.8 |
|
20 |
32.9 |
The air used in the dryer is conditioned by first cooling outside air (20 °C, 40% RH) to 0°C and then heating to 50°C before passing through the dryer. Air flows parallel to the product surface through the dryer having cross sectional dimensions of 150 cm X 100 cm.
Calculate:
- Determine the drying rate in kg H2O/m2.s during the constant rate period.
- Humidity ratio, wet bulb temperature and the mass flow rate (kg air/s) of the air entering to the dryer
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