оkӘTдх-k--kTатдхOTдхо OT-kдхleftT'TIT= 200 - 5(Тleftleftleftleft= 200 + 5(Т,- 25)left= 200 — 5(Тleft- 25)25)= 2005 (25 - T₁)left Air at 25 Ch = 5 Wm² C99Wm²= 200-solaraconvFor the above left surface of the copper plate (k = 400W/m C) the surface absorbs heat flux from the sun of200 W/m2. The surface also convects to the adjacentair, which is at 25 C. The convective heat transfercoefficient is 5 W/m2 C. What is the boundarycondition equation for the left surface, whosetemperature is Tleft C.

Here copper plate is kept in air for heat transfer. It is given that left surface of the copper…

Answered: For the above left surface of the…

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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An experiment to measure the thermal conductivity of food formulations was carried out by measuring the surface temperature of the food formulations which were formed into flat plates with a thickness of 10 mm. It is found that at steady-state conditions, there is a temperature difference of 40 ° C between the two surfaces, the heat transfer rate per unit area of 4700 W / m2 is measured near the center of the two surfaces. Calculate: the thermal conductivity of the product, = AnswerW / m ° C
15.21 The cross section of a storm window is shown in the sketch. How much heat will be lost through a window measuring 1.83 m by 3.66 m on a cold day when the inside and outside air temperatures are, respectively, 295 and 250 K? Convective coefficients on the inside and outside surfaces of the window are 20 and 15 W/m² K, respectively. What temperature drop will exist across each of the glass panes? What will be the average temperature of the air between the glass panes? Air space 0.8 cm wide Window glass 0.32 cm thick
A long thin-walled horizontal tube with a diameter of 100 mm is maintained at 120 °C by passing steam through its interior. An insulator is installed around the tube, providing an air space of 10 mm between the tube and the insulator, and reaching a surface temperature of 35 °C. The tube and the insulator have surfaces with emissivities of 0.80 and 0.10, respectively. What is the radiant heat transfer of the tube per unit length?
A cone frustum is conducting heat at steady-state with no generation. If the frustum is insulated as shown, the heat flux in is the heat flux out. heat flux in insulation heat flux out equal to greater than less than none of the above
A plane surface having an area of 1.0 m² is insulated on the bottom side and is placed on the ground exposed to the atmosphere at night. The upper surface is exposed to air at 290 K, and the convection heat transfer coefficient between the air and surface is 12 W/m²-K. The surface also radiates to the clear sky, and the effective radiation temperature of the sky can be assumed to be 80 K. If the plane surface is assumed to be a black body, calculate the equilibrium temperature of the surface. Note: the temperature of the plane surface is less than the air temperature.
A steel sphere of diameter d and thermal conductivity k is being cooled in a flowing stream of air of bulk temperature T. The temperature distribution in the ball at a particular instant can be approximated as T- a + br + crª, where a, b and c are functions of time, and I is in K. What is the surface heat transfer coefficient? What is the unit of b?
3-A 1-m-long steel plate (k-50W/m.K) is well insulated on its sides, while the top surface is at 100 °C and the bottom surface is convectively cooled by a fluid at 200C. Under steady state conditions with no generation, a thermocouple at the midpoint of the plate reveals a temperature of 85 oC. What is the value of the convection heat transfer coefficient at the bottom surface.
Consider a cylindrical cavity of diameter D =100 mm and depth L = 10 mm whose sidewall and bottom are diffuse and gray with an emissivity of 0.6 and are at a uniform temperature of 1500 K. The top of the cavity is open and exposed to surroundings that are large and at 300 K. (a) Calculate the net radiation heat transfer rate from the cavity, in W, treating the bottom and sidewall of the cavity as one surface. (b) Calculate the net radiation heat transfer rate from the cavity, in W, treating the bottom and sidewall of the cavity as two separate surfaces.

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