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we will calculate with numerical values. Tar the thermal circuit for heat transfer via the composite block (depth W) from left insulation to the right into the atmosphere. Block B's surface has an emissivity of ε = 0.4 and is also exposed to convection. Other known parameters are: LA=0.2 m, LB=0.4 m, H = W=1 m, k = 2 W/mK, kB = 3 W/m-K, T₁ = 50°C, T₂ = 42°C, and To Tsurr 25°C. What must be the value of the convection coefficient (h)? [Hint: Thermal circuit is analogous to electrical circuits. Also remember, Kirchhoff's Current & Voltage Law (KCL & KVL) will apply in thermal circuits.] h. Too

we will calculate with numerical values. Tar the thermal circuit for heat transfer via the composite block (depth W) from left insulation to the right into the atmosphere. Block B's surface has an emissivity of ε = 0.4 and is also exposed to convection. Other known parameters are: LA=0.2 m, LB=0.4 m, H = W=1 m, k = 2 W/mK, kB = 3 W/m-K, T₁ = 50°C, T₂ = 42°C, and To Tsurr 25°C. What must be the value of the convection coefficient (h)? [Hint: Thermal circuit is analogous to electrical circuits. Also remember, Kirchhoff's Current & Voltage Law (KCL & KVL) will apply in thermal circuits.] h. Too

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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Include rad,cond and conv. Show process. (Hint: Conv and rad will be parallel) Equivalent Thermal Resistance Conduction q=-k=+K² 24 k AT = = +AT L Q A K -Rond ² KA = Electric Circuits Heat Transfer Convection น Q 9 = HAT = AT = 2/2 = 24 how the h A h Radiation 2²-b² = (a - b)(a + b) 4 9 = ε 0 (T™ - T₂² ) = EO (T-To) (To+T) ६० q=hAT hrad hrad A V₁ R[2] V₂ www T₁ R[K/W] T₂ = Eo (Tw-Too) (Tw+ Too) (Tw²+ To")) _-_-_) (Tw+Tod) (Tw'"+ AT hrad iR Voltage/Temp ATEQR Drop. we will calculate with numerical values. Tsar the thermal circuit for heat transfer via the composite block (depth W) from left insulation to the right into the atmosphere. Block B's surface has an emissivity of ε = 0.4 and is also exposed to convection. Other known parameters are: LA=0.2 m, LB=0.4 m, H = W=1 m, kA = 2 W/mK, kB = 3 W/mK, T₁ = 50°C, T₂ = 42°C, and Too Tsurr = 25°C. What must be the value of the convection coefficient (h)? [Hint: Thermal circuit is analogous to electrical circuits. Also remember, Kirchhoff's Current & Voltage Law (KCL & KVL) will apply in thermal circuits.] L₂ B h. Too
Transcribed Image Text:Include rad,cond and conv. Show process. (Hint: Conv and rad will be parallel) Equivalent Thermal Resistance Conduction q=-k=+K² 24 k AT = = +AT L Q A K -Rond ² KA = Electric Circuits Heat Transfer Convection น Q 9 = HAT = AT = 2/2 = 24 how the h A h Radiation 2²-b² = (a - b)(a + b) 4 9 = ε 0 (T™ - T₂² ) = EO (T-To) (To+T) ६० q=hAT hrad hrad A V₁ R[2] V₂ www T₁ R[K/W] T₂ = Eo (Tw-Too) (Tw+ Too) (Tw²+ To")) _-_-_) (Tw+Tod) (Tw'"+ AT hrad iR Voltage/Temp ATEQR Drop. we will calculate with numerical values. Tsar the thermal circuit for heat transfer via the composite block (depth W) from left insulation to the right into the atmosphere. Block B's surface has an emissivity of ε = 0.4 and is also exposed to convection. Other known parameters are: LA=0.2 m, LB=0.4 m, H = W=1 m, kA = 2 W/mK, kB = 3 W/mK, T₁ = 50°C, T₂ = 42°C, and Too Tsurr = 25°C. What must be the value of the convection coefficient (h)? [Hint: Thermal circuit is analogous to electrical circuits. Also remember, Kirchhoff's Current & Voltage Law (KCL & KVL) will apply in thermal circuits.] L₂ B h. Too
Expert Solution
Step 1

Given data:

Mechanical Engineering homework question answer, step 1, image 1

T1 = 50oC, T2 = 420C, T∞=Tsurr=250C, kA = 2 w/mK, kB = 3 w/mK,

H=W=1, A = H*W = 1 m2, ε=0.4

Find:

Convective coefficient h =?

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