For a project on sustainable house design, I am trying to model different types of house shapes to see if surface area vs a constant floor space has a significant effect on heat loss. For example, in the winter when the heat is on, will one shape be able to remain at a higher temperature than the other values? At the moment I am still trying to model a common house shape as a baseline for comparison using CFD analysis.
For the basic model of a house, I have about 400 sq ft of floor, 1 feet thick walls, and material wood. I tried a test run of convective heat transfer based on the boundary condition settings in the Meeting Room Tutorial:
Initial boundary temperature: 19.85 C
Ceiling, floor, internal walls: Wall boundary condition > No slip, turbulent heat flux > flux heat source = 0, Initial boundary temperature: 19.85 C
External Wall: Wall boundary condition > No slip, external wall heat flux > derived heat flux = 25 W/m2, 30C ambient temperature
Natural convection at inlet, outlet: ambient temp 19.85 C
However, when I run the simulation, the house is at a really high temperature of 248-285 C, so I am confused on how I got such high temperatures for what I thought were normal boundary conditions.
I am new to Simscale and CFD modeling, so any advice on this problem would be really appreciated.