Internal Temperature of container
Internal Temperature of container
(OP)
Hi All,
I have a box structure measuring 3000mm x 2500mm x 2100mm. This structure has 60mm walls, floor and roof with a thermal coefficient of 0.39. - 0.49 Wm/K
If I said starting point was with an internal temperture of 18 degrees centigrade and the outside was a constant -49 degrees centigrade, how easy would it be to plot the change in internal temperature against time?
I guess you could model something like this in cosmosworks but is there a formula that would work just as well if you ignored things like solar radiation
D
I have a box structure measuring 3000mm x 2500mm x 2100mm. This structure has 60mm walls, floor and roof with a thermal coefficient of 0.39. - 0.49 Wm/K
If I said starting point was with an internal temperture of 18 degrees centigrade and the outside was a constant -49 degrees centigrade, how easy would it be to plot the change in internal temperature against time?
I guess you could model something like this in cosmosworks but is there a formula that would work just as well if you ignored things like solar radiation
D





RE: Internal Temperature of container
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
RE: Internal Temperature of container
Gets more complicated if the box is partially filled with stuff, and the wall construction is non-uniform, and the floor is sitting on the ground, and if the wind is blowing...
How accurate do you need to be?
RE: Internal Temperature of container
RE: Internal Temperature of container
The box is filled with air only.dvd, can you explain a little. Biot number and lumped capacitance do not mean a lot to me (being mechanical!!)
D
RE: Internal Temperature of container
I'd be happy with a start point, which this and worry about equipment within, wind, solar load etc later
D
RE: Internal Temperature of container
At your initial condition there is some amount of energy contained in the air in the enclosure, and some amount of energy contained in the structure of the enclosure.
Over any infinitesimally small time, some energy leaves the air and enters the structure, and some energy leaves the structure to the ambient.
From there you can either solve by brute force or calculus.
RE: Internal Temperature of container
I think you might get more assistance if you explain what your setup looks like, and why you have set a constant temperature boundary condition. If this is a building that is located outdoors then it might be important to assume some wind.
RE: Internal Temperature of container
http://web.mit.edu/lienhard/www/ahtt.html
TTFN
FAQ731-376: Eng-Tips.com Forum Policies