- #1
GasperSavs
- 3
- 0
Hi!
I have a little problem with my "sort of" homework. The question is: Determine what is the highest temperature that still allows a puddle of water to freeze if the heat transfer coefficient is given. Count in convective and radiative losses.
I assume that the highest temperature is slightly lower than 273,15K, because there needs to be a difference between the melting point and the surrounding air temperature, so that the heat transfer from the puddle to the surrounding air (removal of latent heat of fusion) is possible, otherwise the water would just stay at 273,15K in liquid form.
The problem is, that I don't have any dimensional properties of the puddle. To determine the amount of heat needed for a phase change i would need to know the mass of the water. And to determine how much energy is lost via convection and radiation, I would need to know the surface area of the puddle.
So my conclusion is that the answer to this question is purely theoretical and cannot be expressed with a number...so my actual question is: Am i wrong?
Thanks for the answers (and sorry for any grammar faults, English is not my first language)
I have a little problem with my "sort of" homework. The question is: Determine what is the highest temperature that still allows a puddle of water to freeze if the heat transfer coefficient is given. Count in convective and radiative losses.
I assume that the highest temperature is slightly lower than 273,15K, because there needs to be a difference between the melting point and the surrounding air temperature, so that the heat transfer from the puddle to the surrounding air (removal of latent heat of fusion) is possible, otherwise the water would just stay at 273,15K in liquid form.
The problem is, that I don't have any dimensional properties of the puddle. To determine the amount of heat needed for a phase change i would need to know the mass of the water. And to determine how much energy is lost via convection and radiation, I would need to know the surface area of the puddle.
So my conclusion is that the answer to this question is purely theoretical and cannot be expressed with a number...so my actual question is: Am i wrong?
Thanks for the answers (and sorry for any grammar faults, English is not my first language)