1.24 Asphalt pavements on hot summer days exhibit surface tempera-tures of approximately 50 °C. Consider such a surface to cmit as ablackbody and calculate the emitted radiant energy per unit surfacearea.Ans 617 W/m

Given Temperature, T = 50oC = 323 K Boltzman constant = 5.67 x 10-8 W/m2 K4

1.24 Asphalt pavements on hot summer days exhibit surface tempera- tures of approximately 50 C. Consider such a surface to emit as a blackbody and calculate the emitted radiant energy per unit surface area. Ans 617 W/m

1.24 Asphalt pavements on hot summer days exhibit surface tempera- tures of approximately 50 C. Consider such a surface to emit as a blackbody and calculate the emitted radiant energy per unit surface area. Ans 617 W/m

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter1: Basic Modes Of Heat Transfer

Section: Chapter Questions

Problem 1.31P: A spherical communications satellite, 2 m in diameter, is placed in orbit around the earth. The...

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A spherical communications satellite, 2 m in diameter, is placed in orbit around the earth. The satellite generates 1000 W of internal power from a small nuclear generator. If the surface of the satellite has an emittance of 0.3, and is shaded from solar radiation by the earth, estimate its surface temperature.
1.29 A spherical interplanetary probe with a 30-cm diameter contains electronic equipment that dissipates 100 W. If the probe surface has an emissivity of 0.8, what is its surface temperature in outer space? State your assumptions in the calculations.
1.76 Explain a fundamental characteristic that differentiates conduction from convection and radiation.
Using Table 1.4 as a guide, prepare a similar table showing the orders of magnitude of the thermal resistances of a unit area for convection between a surface and various fluids.
A pipe carrying superheated steam in a basement at 10C has a surface temperature of 150C. Heat loss from the pipe occurs by radiation (=0.6) and natural convection (hc=25W/m2K). Determine the percentage of the total heat loss by these two mechanisms.
The heat transfer rate from hot air by convection at 100C flowing over one side of a flat plate with dimensions 0.1m0.5m is determined to be 125 W when the surface of the plate is kept at 30C. What is the average convection heat transfer coefficient between the plate and the air?
After the sinking of RMS Titanic, US operated the International Ice patrol with the purpose of monitoring the presence and movements of icebergs in the Atlantic and Arctic oceans. Once, they observed a unique tabular iceberg in a form of a rectangle (250 km x 50 km x 300 m). The sun is the only source of heat and the ice absorbs a mean of 98 J/m2-s, 12.5 hrs per day. The exposed area for heating is 250 km x 50 km and the density is 920 kg/m3. What is the total mass of the iceberg? Express answer in kg and in scientific notation with two decimal places. To input: if the answer is 4.78x1025, input 4.78e25.
Seh o I em Avertical cylinder with radlis 23 , ylinder height L eynat to i diameter, and surface temperature 70Cis standing iasalated Hout, and the sarrennding walls at 25 C. What is the antonnt of heat that lest by radiation "Watts" ben the vmiiity is .9 feiect one A 25 OD.113 E10101 NETE PREVIOUS PAGE CONTACTUS GET SOCIAL INPO
After the sinking of RMS Titanic, US operated the International Ice patrol with the purpose of monitoring the presence and movements of icebergs in the Atlantic and Arctic oceans. Once, they observed a unique tabular iceberg in a form of a rectangle (250 km x 50 km x 300 m). The sun is the only source of heat and the ice absorbs a mean of 98 J/m2-s, 12.5 hrs per day. The exposed area for heating is 250 km x 50 km and the density is 920 kg/m3. Which of the following statements is/are correct based on the above description? Check all that apply. The heat involved is latent heat only. The mass of the iceberg can be determined from the given density and dimensions. The heat involved are both latent and sensible heats. The total amount of the heat absorbed by the ice has negative sign.
After the sinking of RMS Titanic, US operated the International Ice patrol with the purpose of monitoring the presence and movements of icebergs in the Atlantic and Arctic oceans. Once, they observed a unique tabular iceberg in a form of a rectangle (250 km x 50 km x 300 m). The sun is the only source of heat and the ice absorbs a mean of 98 J/m2-s, 12.5 hrs per day. The exposed area for heating is 250 km x 50 km and the density is 920 kg/m3. Which of the following statements is/are correct based on the above description? Check all that apply. The heat involved are both latent and sensible heats. The mass of the iceberg can be determined from the given density and dimensions. The heat involved is latent heat only. The total amount of the heat absorbed by the ice has negative sign.
After the sinking of RMS Titanic, US operated the International Ice patrol with the purpose of monitoring the presence and movements of icebergs in the Atlantic and Arctic oceans. Once, they observed a unique tabular iceberg in a form of a rectangle (250 km x 50 km x 300 m). The sun is the only source of heat and the ice absorbs a mean of 98 J/m2-s, 12.5 hrs per day. The exposed area for heating is 250 km x 50 km and the density is 920 kg/m3. What is the total mass of the iceberg? Express answer in kg and in scientific notation with two decimal places.
If we consider a flat sheet of iron at 300 K does not receive any radiation from its surroundings. The metal is 10 cm x 10 cm x 0.1 cm; the heat capacity is 25 J/K mol; the density is 7.86 g/cm3. After 20 minutes, what is the temperature of the metal plate? Ans. -54.15 Celsius Show solution.