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(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 Tw= 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 Tw= 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
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
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(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 Tw= 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.
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 Tw= 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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