A 0.5-m high, O.7-m wide oven door oriented vertically reaches an average surface temperature of 32°C during operation. The door has an emissivity of 1.0 and the surroundings of the room are at a temperature of 22°C. To compute for the Nusselt number of the air flow, what is the exact value of the temperature in °C on which the air properties should be based?

A 0.5-m high, O.7-m wide oven door oriented vertically reaches an average surface temperature of 32°C during operation. The door has an emissivity of 1.0 and the surroundings of the room are at a temperature of 22°C. To compute for the Nusselt number of the air flow, what is the exact value of the temperature in °C on which the air properties should be based?

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

See similar textbooks

Similar questions

Question A5 To improve indoor air quality, an Edinburgh pub has installed a vertical glass screen to cover the opening of its fireplace. The square-shaped screen has a side of length 1.5 m and a surface temperature of 232°C. Determine the heat transfer from the fireplace to the room if the ambient and wall temperatures are both 22°C and the emissivity of the glass surface is 0.9. (Use the following for air: k = 3.38 x 10-2 W/mK, v = 2.641 x 105 m²/s, Pr = 0.690.) %3D
16-67E A 2-in-diameter spherical ball whose surface is maintained at a temperature of 170°F is suspended in the middle of a room at 70°F. If the convection heat transfer coefficient is 15 Btu/h-ft².°F and the emissivity of the surface is 0.8, deter- mine the total rate of heat transfer from the ball. 16-68 An 800-W iron is left on the iron board with its base exposed to the air at 20°C. The convection heat trans- fer coefficient between the base surface and the surround- ing air is 35 W/m².K. If the base has an emissivity of 0.6 and a surface area of 0.02 m², determine the temperature of the base of the iron. Answer: 601°C Iron 800 W FIGURE P16-68 20°C
A well-insulated inside room, 6 m wide and 9 m long with a 3 m ceiling height, is to be heated by means of a ceiling panel installation. It is desired to maintain the surface of the floor at a temperature of 27 oC. Determine the necessary ceiling surface temperature to meet this requirement if the floor is to be planed oak, the ceiling is to be painted with an oil paint, and it is estimated that the portion of the heating requirement to be supplied by radiation is 2 500 W. Assume the walls to be nonconducting but reradiating.
what is the reason that someone can feel comfortable in a room that consists of 20oC drybulb temperature and a wet bulb temperature of 15oC ? explain with some calculation if possible (a detailed answer will be appreciated )
A square array of 2 cm diameter pipes consists of 64 pipes, each 80 cm long. The pipe surface temperature is 97 °C and is exposed to water vapor at 1 atm.Calculate the amount of condensed water in kg/hour
Illustrating the relationships between system constants for the chosenperfect gas system(refrigeration systems). Discuss the relevance of the ideal gas law constants and explain how changes in one variable affectthe others under the condition of a perfect gas. Include molar mass, gas constant, and specific heatcapacities of gases, including the associated equations.
Explain why convection happens more often in gases and liquids than solids.
Consider a cylindrical tank with a surface temperature of 44°C which contains water. The height of the tank is 1.1 m and its diameter is 0.4 m. The tank is in a room at 20°C. If the surrounding temperature is also at 20°C, calculate the total rate of heat transfer from all surfaces of the tank by natural convection and radiation. Consider the emissivity to be 0.4. Assumptions: 1 Steady operating conditions exist. 2 Air is an ideal gas. 3 The local atmospheric pressure is 1 atm. Note. Report your solution step by step and clearly.
What is smog? What does it consist of?