Analysis of heat and moisture behavior in underground space by quasilinearized method: accuracy range for outdoor climate varition from the reference

Coupled heat and moisture transfer equations which describe temperature and moisture fields in the building walls, the earth ground and so on are nonlinear. Due to the nonlinearity, the complicated analysis has to be performed in each time under the different boundary values. If linearization of the system with adequate accuracy can be achieved, a solution can be obtained simply by applying the superposition principle. The purpose of this paper is to clarify the range of outdoor conditions that the quasilinearized method is available on the heat and moisture behavior in the underground space under the natural condition.