- #1
DaveC426913
Gold Member
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I'm trying to guess when my hot tub will be ready for use.
If an ideal body of water is insulated and has a constant source of heating applied to it, can its temperature be expected to rise linearly?
(No. Even as I write this I see it can't be true. As the water temp rises, it will approach the temp of the heater, reducing the difference, meaning the rate of heat transfer will decrease.)
Well, my next question is moot then.
I was wondering if I saw a leveling off of temp rise over the next 25 hours, that would indicate inefficient insulation. i.e. as the hot tub heated, more and more heat would be lost because heat transfer is affected by temp difference. But nevermind, that's confounded by the above.
Anyway, it's risen from 56F to 63F in 4h20m. If it increased linearly, it would reach a max temp of 104F in just over 25h. (7 degrees in 300 minutes is ~ 1d/37m ... x 41d = 1517m = 25h17m)
If an ideal body of water is insulated and has a constant source of heating applied to it, can its temperature be expected to rise linearly?
(No. Even as I write this I see it can't be true. As the water temp rises, it will approach the temp of the heater, reducing the difference, meaning the rate of heat transfer will decrease.)
Well, my next question is moot then.
I was wondering if I saw a leveling off of temp rise over the next 25 hours, that would indicate inefficient insulation. i.e. as the hot tub heated, more and more heat would be lost because heat transfer is affected by temp difference. But nevermind, that's confounded by the above.
Anyway, it's risen from 56F to 63F in 4h20m. If it increased linearly, it would reach a max temp of 104F in just over 25h. (7 degrees in 300 minutes is ~ 1d/37m ... x 41d = 1517m = 25h17m)