The Analyses Of Heat And Moisture Transfer And The Risk Of Mould Growth In The Underground Buildings

With the rapid development of national economy and urbanization, the density ofcity population is increasing which is inconvenient to our daily life. In order to meetthe demand for living space of the city, there are a large number of underground mallsand underground rail transportations are built in recent years. As the development ofunderground buildings, more and more attentions are paid to the energy consumptionthrough the building envelope, the risk of mold growth and economy of buildingenvelope. It is urgent for us to find a method, which has fully considered the threefactors above, to select a better building envelope.Firstly, the thesis has modified the boundary conditions of coupled heat andmoisture transfer model which is previous researchers’ result. In order to calculate theheat and moisture load of building envelope, the thesis has developed a computerprogram using the software of FORTRAN to solve the discrete equations and simulatethe process of heat and moisture transfer. Secondly, the thesis has assessed the mouldrisk of different building envelope using the isopleths model and biohygrothermalmodel according to the changes of temperature and moisture. Thirdly, the thesis hasanalyzed the economy of different building envelope using the evaluating indicator ofstable investment recovery period and investment yield. Finally, the thesis has studiedthe weight of different building envelope which can provide basis for selecting thebetter scheme by means of analytic hierarchy process (AHP). The main results of thisstudy show that:(1)The ranking of energy consumption of different building envelope schemefrom high to low is without heat insulating material, exterior insulation, internalinsulation, exterior insulation with waterproofing roll roofing.(2)The ranking of the risk of mold growth of different building envelope schemefrom high to low is, internal insulation, exterior insulation, exterior insulation withwaterproofing roll roofing.(3) The ranking of the economy of different building envelope scheme from highto low is internal insulation, exterior insulation, exterior insulation with waterproofingroll roofing, without heat insulating material.(4) The ranking of different building envelope scheme from high to low isexterior insulation with waterproofing roll roofing, exterior insulation, internal insulation, without heat insulating material.