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2. a) What is the heat loss per square meter through a furnace wall constructed from 130 mm of alumina firebrick (k 2.5 W/m2 K/m) backed with 90 mm of insulating brick (k-0.12 W/m2 K/m) and 5 mm of steel shell (k = 43.3 W/m2 K/m)? The temperature of the hot face of the refractory brick is 1500 oC and the outside of the furnace is open to air at 25 C. The schematic representation of the construction is shown below. Calculate the inner temperatures T1 and T2. 25°C T2°C T°C 1500°C Steel shell Insulation Firebrick /- 90 mm 5 mm 130 mm

2. a) What is the heat loss per square meter through a furnace wall constructed from 130 mm of alumina firebrick (k 2.5 W/m2 K/m) backed with 90 mm of insulating brick (k-0.12 W/m2 K/m) and 5 mm of steel shell (k = 43.3 W/m2 K/m)? The temperature of the hot face of the refractory brick is 1500 oC and the outside of the furnace is open to air at 25 C. The schematic representation of the construction is shown below. Calculate the inner temperatures T1 and T2. 25°C T2°C T°C 1500°C Steel shell Insulation Firebrick /- 90 mm 5 mm 130 mm

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
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2. a) What is the heat loss per square meter through a furnace wall constructed from 130 mm of alumina firebrick (k = 2.5 W/m² K/m) backed with 90 mm of insulating brick (k=0.12 W/m² K/m) and 5 mm of steel shell (k = 43.3 W/m2 K/m)? The temperature of the hot face of the refractory brick is 1500 °C and the outside of the furnace is open to air at 25 °C. The schematic representation of the construction is shown below. Calculate the inner temperatures T1 and T2. 25°C T,°C 1500°C Steel shell Insulation Firebrick 5 mm 90 mm 130 mm b) Answer the following questions briefly. i- What are the major sections of a fired heater? ii- What is primary air and secondary air? State their functions. iii- What are the consequences of using less excess air than the recommended minimum values?
Transcribed Image Text:2. a) What is the heat loss per square meter through a furnace wall constructed from 130 mm of alumina firebrick (k = 2.5 W/m² K/m) backed with 90 mm of insulating brick (k=0.12 W/m² K/m) and 5 mm of steel shell (k = 43.3 W/m2 K/m)? The temperature of the hot face of the refractory brick is 1500 °C and the outside of the furnace is open to air at 25 °C. The schematic representation of the construction is shown below. Calculate the inner temperatures T1 and T2. 25°C T,°C 1500°C Steel shell Insulation Firebrick 5 mm 90 mm 130 mm b) Answer the following questions briefly. i- What are the major sections of a fired heater? ii- What is primary air and secondary air? State their functions. iii- What are the consequences of using less excess air than the recommended minimum values?
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