NUMERICAL SIMULATION OF HEAT AND MOISTURE TRANSPORT IN BUILDING ENVELOPES WITH INSIDE THERMAL INSULATION SYSTEMS ON THE MINERAL WOOL BASIC

摘要

In this paper, coupled heat and moisture transport in building envelopes with interior thermal insulation systems on the mineral wool basis including water vapor retarder is simulated using the computer code DELPHIN 4.1. Temperature, relative humidity and overhygroscopic moisture fields are calculated for the time period of several years. The proper hygrothermal performance of the systems with chosen type of mineral wool insulation boards is controlled by choosing a suitable value of water vapor diffusion resistance factor μ of water vapor retarder for various materials of the load bearing structures. The insulation board PR analyzed in this paper is found to perform well for three chosen types of load bearing structures even without any water vapor retarder. However, its density is probably too high, which may lead to technological problems in the practical applications.