Heat transfer question-COnvection+radiation

In summary, there is a difference in the given solutions for the convective heat transfer coefficient in the scenario described, with three authors giving an answer of 25 and one author giving an answer of 50. Considering the radiation only on one side and the need for convection on both sides, it can be argued that 50 is the correct solution. However, this may also depend on the specific context and assumptions made. Ultimately, it is important to carefully consider the given information and equations to determine the most accurate solution.
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Homework Statement



A thin flat plate 2m×2m is hanging freely in air. The temperature of the surroundings is 25°C. Solar radiation is falling on one side of the plate at the rate of 500 W/m2. What should be the convective heat transfer coefficient in W/m2°C, if the temperature of the plate is to remain constant at 30°C?
A 25
B 50

Homework Equations



There are 2 version

The Attempt at a Solution



First version:500x4=2(hx4x5)
h=50

Second version: 500=hx4x5
h=25

3 authors gave 25 as the answer, while 1 author gave 50 as the answer. I personally felt 50 is the correct solution as radiation is in 500W/m^2 not 500W, also taking into account convection on both sides, with radiation only on one side.

[/B]


Can anyone clarify what is the real answer? Which version should i believe?
 
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  • #2
I agree with your assessment.
 

What is convection heat transfer?

Convection heat transfer is the process of transferring heat through the movement of fluids, such as air or water. This movement occurs due to differences in temperature and density within the fluid, creating a continuous cycle of hot and cold regions.

What is radiation heat transfer?

Radiation heat transfer is the transfer of heat through electromagnetic waves, such as infrared radiation. Unlike convection and conduction, radiation heat transfer does not require a medium and can occur through empty space.

What is the difference between convection and radiation heat transfer?

The main difference between convection and radiation heat transfer is the mode of heat transfer. Convection involves the movement of fluids, while radiation involves the transfer of heat through electromagnetic waves. Additionally, convection requires a medium, while radiation can occur through empty space.

How does convection heat transfer affect the Earth's climate?

Convection heat transfer plays a crucial role in regulating the Earth's climate. As warm air rises and cool air sinks, it creates global wind patterns, which in turn influence the distribution of heat and moisture around the Earth. This process helps to maintain a relatively stable climate on Earth.

What are some real-world examples of convection and radiation heat transfer?

Convection heat transfer can be seen in natural phenomena such as ocean currents, wind patterns, and the Earth's water cycle. Radiation heat transfer can be seen in the warmth you feel from the sun, the heat emitted by a fire, and the use of infrared technology in remote sensing and communication.

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