in the same folder there is a new file now: help.xls.
If you take a look at the temperature profiles you can see the different orientations of the walls.
The negative surface conduction values may be caused by three effects: 1) very thin wall constructions, 1cm, 2) solar radiation 3) longwave radiation exchange within the room.
This means that solar radiation leeds to high outside surface temperatures. Because of a low thermal resistance of walls the inside surface temperature is very similar to the outside surface temperature. In dependence of the sun's position the walls temperatures change during a day. In the morning the eastwall is the warmest, In the afternoon the westwall is the warmest und during noon it is the ceiling which is warmest. Because of langwave radiation effects the warmest wall works as a radiative heater. This means the inside surface temperature of the other more colder surfaces gets higher than the outside one and inside surfcae conduction is below zero.
So, increasing the thickness of the walls or reduce their conductivity could help.
Dr.-Ing. Clemens Felsmann
Institut für Thermodynamik und TGA der TU Dresden
Tel.: 0351/463 3 5177
Fax: 0351/463 3 7888
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