PE4 Determine local conductive resistance r (in m².K/W) of a 90 m² plane wall composed of 2layers in series:Layer 1: brick, thickness 8₁ = 240.0 mm, thermal conductivity 2₁ = 0.400 W/(m.K)Layer 2: EPS, thickness 8₂ = 120.0 mm, thermal conductivity 2₂ = 0.040 W/(m.K)Evaluate the rate of heat loss through this wall if its inner surface temperature is 26 °Cand its outer surface temperature is -24 °C.

Given Details: Plane wall composed of 2 Layers in series. Brick: Thickness,δ1=240.0 mm , thermal…

Answered: PE4 Determine local conductive…

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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Heat transfer
1. A layered wall consists of a copper plate with a thickness of 2.5 cm, the second layer is made of asbestos, the thickness is 3.2 mm, and the third layer is made of glass fiber with a thickness of 5 cm. The overall temperature difference of this wall is 560 ° C. a. Calculate the overall heat transfer rate on this layered wall. b. Calculate T2 and T3
A composite wall consisting of five series layers of materials with different properties. Layer thickness, thermal conductivity of the layers and temperatures are shown on the figure. Based on Fourier's law for conduction, answer the following questions. 1. What are the main assumptions? 2. Drive an equation to calculate the heat transfer rate through the Composite wall? 3. Draw the thermal circuit through composite wall? 4. What are the value Ti? 5. What are the value Tj? 6. What are the value Tr? Givens: KA = 2 W/m. °C KB = 1 W/m.°C Kc= 5 W/m. °C Kp= 4 W/m. °C 100°C Ti 25°C Tj Tr А C D +2cm + 6 cm- -4 cm 4cm
In a multi-layered square wall, the thermal resistance of the first layer is 0.005 ° C / W, the resistance of the second layer is 0.4 ° C / W, and the third layer is 0.1 ° C / W. The overall temperature gradient in the wall is multilayered from one side. to the other side is 60 ° C. a. Determine the heat flux through the walls. = Answerwatts / m2. b. If the thermal resistance of the second layer is changed to 0.2 ° C / W, what is the effect in% on heat flux, assuming the temperature gradient remains the same? = %. Answer
5- Air, at 100 °C, flows through a thin-walled steel tube with an inside diameter 25 mm. The wall thickness is 0.5 mm. Thermal conductivity of the steel is 40 W/mk. The tube is exposed to an environment at 20 °C with heat transfer coefficient of 10 W/m²K. The film coefficient at the inner surface is 50 W/m²K. Calculate (i) Overall heat transfer coefficient, Ui, (ii) Heat loss per m length, (iii) What thickness of insulation having thermal conductivity of 0.035 W/mK must be applied to reduce the heat loss by 50%?
question in image. only need help with 2nd question
A 4mx5m wall consists of 3 glass windows of 1.5mx1.0m dimensions. The wall has thickness of 0.125 m and a thermal conductivity of 0.5 W/mK, while the glass windows are 6 mm thick with a thermal conductivity of 1.24 W/mK. The values of Internal and external surface conductance for the wall (including glass) are 8.3 W/m K and 34.4 W/m²K, respectively. The internal and external temperatures are 21°C and -30°C, respectively. Calculate the total heat transfer rate through the wall. What percentage of this heat transfer is through the windows?
In a multi-layered square wall, the thermal resistance of the first layer is 0.005 ° C / W, the resistance of the second layer is 0.4 ° C / W, and the third layer is 0.1 ° C / W. The overall temperature gradient in the wall is multilayered from one side. to the other side is 60 ° C. a. Determine the heat flux through the walls. = Answerwatt / m2. b. If the thermal resistance of the second layer is changed to 0.2 ° C / W, what is the effect in% on heat flux, assuming the temperature gradient remains the same? = AnswerAnswer%.
A 15 cm (schedule 80, IPS) steam main has a 10 cm thick 'preformed' mineral fibre insulation on it. The thermal conductivity of the insulation is 0.035 W/m °C, and the heat transfer coefficient at the outer surface of the insulation is 10 W/m² °C. What is the critical insulation thickness?
4. A bilayer polymer slab (1.2m long, 1.4m wide, 5 cm thick) is placed on a hot plate, which keeps the side of the slab touching the hot plate at 105C. The thermal conductivity of Layer 1 (2 cm thick) is 0.44 W/mK and the thermal conductivity of Layer 2(3 cm thick) is 0.67 W/m K. If the air surrounding the slab is 27 C and the convective heat transfer coefficient between the top of the slab and the air is 20 W/m²K. What is the rate of heat transfer from the side of the slab touching the hot plate to the air?

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