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2. In a production facility, thin square plates 2 mx 2 m in size coming out...
The components of an electronic system dissipating 150W are located in a 1 m long horizontal...
The components of an electronic system dissipating 150W are located in a 1 m long horizontal duct whose cross section is 15 cm x 15 cm. The components in the duct are cooled by forced air, which enters at 25°C at a rate of 0.4 m3/min and leaves at 45°C The surfaces of the sheet metal duct are not painted, and thus radiation heat transfer from the outer surfaces is negligible. If the ambient air temperature is 25°C, determine (a)...
A 69-cm x 69-cm circuit board that contains 121 square chips on one side is to...
A 69-cm x 69-cm circuit board that contains 121 square chips on one side is to be cooled by combined natural convection and radiation by mounting it on a vertical surface in a room at 25°C. Each chip dissipates 0.18 W of power, and the emissivity of the chip surfaces is 0.7. Assume the heat transfer from the back side of the circuit board to be negligible, and the temperature of the surrounding surfaces to be the same as the...
, A tite ditèrence analysis vestir coeficient is h. sis has been performed on the fin of diameter D using a uniform spacing o perfi at each node has been obtained. The thermal conducti has been obtai...
, A tite ditèrence analysis vestir coeficient is h. sis has been performed on the fin of diameter D using a uniform spacing o perfi at each node has been obtained. The thermal conducti has been obtained. The thermal conductivity of the fin is & and the ambient flow hich discretized equation for node T, is correct? f Ax and the equatio s A hole is drilled through the center of a solid block of square cross section. The hole...
Hot carbon dioxide exhaust gas at 1 atm is being cooled by flat plates. The gas...
Hot carbon dioxide exhaust gas at 1 atm is being cooled by flat
plates. The gas at 220°C flows in parallel over the upper and lower
surfaces of a 1.4-m-long flat plate at a velocity of 1.8 m/s and
the flat plate surface temperature is maintained at 80°C. The
properties of CO2 at Tf = (220°C + 80°C)/2 = 150°C are k = 0.02652
W/m∙K, ν = 1.627 × 10−5 m2/s, and Pr = 0.7445. Determine the local
convection heat...
Problem 2. A long thin alloy wire with a diameter of 0.2 mm is exposed to...
Problem 2. A long thin alloy wire with a diameter of 0.2 mm is exposed to ambient air at T, -25°C with a combined heat transfer coefficient h-10 W/m2.K (due to natural convection and radiation). An electric current10.15 A flows through the wire. The electrical resistance of the wire per unit length is R-162/m. (a) Draw a control volume to write down the energy balance equation. (b) Determine the steady-state temperature of the alloy wire, assuming that the solid wire...
Heat Transfer problem, ch9 Will give instant thumbs up! Problem 14: Also, after going over example...
Heat Transfer problem, ch9
Will give instant thumbs up!
Problem 14: Also, after going over example problem 9-2, determine the heat transfer by natural convection for the hot plate facing down with 0 = 30°. Cooling of a Plate in Different Orientations Consider a 0.6-m x 0.6-m thin square plate in a room at 30°C. One side of the plac is maintained at a temperature of 90°C, while the other side is insulated, as shown in Fig. 9-18. Determine the...
Question 1: Identify the classification of the following heat transfer (convective flow) problems: *Note that there...
Question 1: Identify the classification of the following heat transfer (convective flow) problems: *Note that there may be other modes of heat transfer present (e.g. radiation or conduction), but ignore those effects. For example, a hot ball bearing being dropped from a building roof. Ans. Forced, external convection over a sphere. a. Water flow through a fire hose from a hydrant. b. Heat transfer from a clothes iron sitting on an ironing board. c. Heat transfer from a climber trapped...
Homework 7 heat transfer 2018-20 1) A horizontal tube of 12.5-mm dimeter with an outer srface temperature of 240°C is placed in a room with an air temperature of 20°C. Estimate the heat transfer rate...
Homework 7 heat transfer 2018-20 1) A horizontal tube of 12.5-mm dimeter with an outer srface temperature of 240°C is placed in a room with an air temperature of 20°C. Estimate the heat transfer rate per unit length of the tube due to free convection. 2) Air at -10°C flows at 10 m/s over the roof plate of two 5m length rooms whose air is at Too-200C. The roof plate is 0.20-m thick concrete (k = 0.6 w/ m. K)....
Two large parallel plates with surface conditions approximating those of a blackbody are maintained at 800°C...
Two large parallel plates with surface conditions approximating those of a blackbody are maintained at 800°C and 100°C, respectively. Determine the rate of heal transfer by radiation between the plates in Wim and the radiative heat transfer coefficient in W/m K ) 12 Write down the one-dimensional sent heal conduction equation for a plane wall with constant thermal conductivity and heat generation in its simplest form, and indicate what each variable represents 13 Write down the one-dimensional transient heat conduction...
summatize the following info and break them into differeng key points. write them in yojr own...
summatize the following info and break them into differeng key points. write them in yojr own words
apartus
6.1 Introduction—The design of a successful hot box appa- ratus is influenced by many factors. Before beginning the design of an apparatus meeting this standard, the designer shall review the discussion on the limitations and accuracy, Section 13, discussions of the energy flows in a hot box, Annex A2, the metering box wall loss flow, Annex A3, and flanking loss, Annex...
The components of an electronic system dissipating 150W are located in a 1 m long horizontal duct whose cross section is 15 cm x 15 cm. The components in the duct are cooled by forced air, which enters at 25°C at a rate of 0.4 m3/min and leaves at 45°C The surfaces of the sheet metal duct are not painted, and thus radiation heat transfer from the outer surfaces is negligible. If the ambient air temperature is 25°C, determine (a)...
, A tite ditèrence analysis vestir coeficient is h. sis has been performed on the fin of diameter D using a uniform spacing o perfi at each node has been obtained. The thermal conducti has been obtained. The thermal conductivity of the fin is & and the ambient flow hich discretized equation for node T, is correct? f Ax and the equatio s A hole is drilled through the center of a solid block of square cross section. The hole...
Hot carbon dioxide exhaust gas at 1 atm is being cooled by flat
plates. The gas at 220°C flows in parallel over the upper and lower
surfaces of a 1.4-m-long flat plate at a velocity of 1.8 m/s and
the flat plate surface temperature is maintained at 80°C. The
properties of CO2 at Tf = (220°C + 80°C)/2 = 150°C are k = 0.02652
W/m∙K, ν = 1.627 × 10−5 m2/s, and Pr = 0.7445. Determine the local
convection heat...
Problem 2. A long thin alloy wire with a diameter of 0.2 mm is exposed to ambient air at T, -25°C with a combined heat transfer coefficient h-10 W/m2.K (due to natural convection and radiation). An electric current10.15 A flows through the wire. The electrical resistance of the wire per unit length is R-162/m. (a) Draw a control volume to write down the energy balance equation. (b) Determine the steady-state temperature of the alloy wire, assuming that the solid wire...
Heat Transfer problem, ch9
Will give instant thumbs up!
Problem 14: Also, after going over example problem 9-2, determine the heat transfer by natural convection for the hot plate facing down with 0 = 30°. Cooling of a Plate in Different Orientations Consider a 0.6-m x 0.6-m thin square plate in a room at 30°C. One side of the plac is maintained at a temperature of 90°C, while the other side is insulated, as shown in Fig. 9-18. Determine the...
Question 1: Identify the classification of the following heat transfer (convective flow) problems: *Note that there may be other modes of heat transfer present (e.g. radiation or conduction), but ignore those effects. For example, a hot ball bearing being dropped from a building roof. Ans. Forced, external convection over a sphere. a. Water flow through a fire hose from a hydrant. b. Heat transfer from a clothes iron sitting on an ironing board. c. Heat transfer from a climber trapped...
Homework 7 heat transfer 2018-20 1) A horizontal tube of 12.5-mm dimeter with an outer srface temperature of 240°C is placed in a room with an air temperature of 20°C. Estimate the heat transfer rate per unit length of the tube due to free convection. 2) Air at -10°C flows at 10 m/s over the roof plate of two 5m length rooms whose air is at Too-200C. The roof plate is 0.20-m thick concrete (k = 0.6 w/ m. K)....
Two large parallel plates with surface conditions approximating those of a blackbody are maintained at 800°C and 100°C, respectively. Determine the rate of heal transfer by radiation between the plates in Wim and the radiative heat transfer coefficient in W/m K ) 12 Write down the one-dimensional sent heal conduction equation for a plane wall with constant thermal conductivity and heat generation in its simplest form, and indicate what each variable represents 13 Write down the one-dimensional transient heat conduction...
summatize the following info and break them into differeng key points. write them in yojr own words
apartus
6.1 Introduction—The design of a successful hot box appa- ratus is influenced by many factors. Before beginning the design of an apparatus meeting this standard, the designer shall review the discussion on the limitations and accuracy, Section 13, discussions of the energy flows in a hot box, Annex A2, the metering box wall loss flow, Annex A3, and flanking loss, Annex...
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