(Mass and energy balance in a dryer)² Air at 25°C and 70% relative humidity is heated in an air heater and the hot air is supplied to a dryer. Three hundred kilogram of moisture is removed from the dryer per hour. It is desired that the moist air should leave the dryer at TG 55°C and T₁ = 40°C. Heat required for warming up of the wet solid and the heat losses taken together amount to 15% of that necessary for evaporation of water in the dryer. Calculate the temperature and flow rate of the hot air supplied to the dryer. Saturated steam at 5 atm gauge is used for air heating, and the overall heat transfer coefficient is 32 W/m2.°C. Calculate the area of the air heater. Given: latent heat of vaporization of water in the dryer = 2370 kJ/kg; latent heat of vaporization of saturated steam at 5 atm gauge = 2100 kJ/kg.
(Mass and energy balance in a dryer)² Air at 25°C and 70% relative humidity is heated in an air heater and the hot air is supplied to a dryer. Three hundred kilogram of moisture is removed from the dryer per hour. It is desired that the moist air should leave the dryer at TG 55°C and T₁ = 40°C. Heat required for warming up of the wet solid and the heat losses taken together amount to 15% of that necessary for evaporation of water in the dryer. Calculate the temperature and flow rate of the hot air supplied to the dryer. Saturated steam at 5 atm gauge is used for air heating, and the overall heat transfer coefficient is 32 W/m2.°C. Calculate the area of the air heater. Given: latent heat of vaporization of water in the dryer = 2370 kJ/kg; latent heat of vaporization of saturated steam at 5 atm gauge = 2100 kJ/kg.
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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Transcribed Image Text:(Mass and energy balance in a dryer)² Air at 25°C and 70% relative humidity is heated
in an air heater and the hot air is supplied to a dryer. Three hundred kilogram of moisture
is removed from the dryer per hour. It is desired that the moist air should leave the dryer
at TG 55°C and T₁ = 40°C. Heat required for warming up of the wet solid and the heat
losses taken together amount to 15% of that necessary for evaporation of water in the
dryer. Calculate the temperature and flow rate of the hot air supplied to the dryer.
Saturated steam at 5 atm gauge is used for air heating, and the overall heat transfer
coefficient is 32 W/m2.°C. Calculate the area of the air heater. Given: latent heat of
vaporization of water in the dryer = 2370 kJ/kg; latent heat of vaporization of saturated
steam at 5 atm gauge = 2100 kJ/kg.
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