Math Problem Statement
Questão 6 (2,0 ptos): Uma tubulação de vapor de 25 cm e 225 metros de comprimento é coberta com 5 cm de isolamento de alta temperatura (k = 0,095 W/m.K) e 4 cm de isolamento de baixa temperatura (k = 0,065 W/m.K). As temperaturas da superfície interna e externa medidas são 400 °C e 50 °C, respectivamente. Despreze a condução de calor através do material do tubo. Determine: a) A perda total de calor por hora; b) A perda total de calor por m² de superfície externa; c) A perda de calor por m² de superfície do tubo; d) A temperatura entre as duas camadas de isolamento.
Solution
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Math Problem Analysis
Mathematical Concepts
Heat Transfer
Thermal Conductivity
Thermal Resistance
Logarithmic Functions
Formulas
Heat transfer in cylindrical layers: Q̇ = (T_interna - T_externa) / R_total
Thermal resistance for cylindrical layers: R = ln(r_externo/r_interno) / (2πkL)
Surface area of a cylinder: A = 2πrL
Temperature between layers: T_meio = T_interna - Q̇ * R_1
Theorems
Fourier's Law of Heat Conduction
Suitable Grade Level
Undergraduate Engineering (Thermodynamics)
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