Wind tunnel experimental study on influence factors of evaporative heat transfer of porous building material

With Orthogonal experimental method, an experimental study on influence factors of evaporative heat transfer of aerated concrete under a certain moisture content was carried out in the hot-humid climatic wind tunnel. The factors concerned include four meteorological factors and sample thickness. Measured from the impact of significant and persistent on evaporative heat transfer, solar radiation is the greatest influence factor, then followed by the sample thickness, the air velocity is in the third order, and the last factor is ambient air temperature, the air relative humidity and the interaction of air temperature with it have no statistically significant influence. Through the analyze we know that the most dramatically significant level of infrared power, air velocity, air temperature and sample thickness on the evaporative heat transfer were 400 w/m², 1.5 m/s, 30°C and 100mm respectively.