Test And Analysis On Thermal Environment Of The Stone Masonry Building In South Fujian During Summer Season

Most of the rural buildings in coastal areas of south Fujian,which are known as being rich in granite resource,are stone masonry buildings.With high temperature and high humidity walls and roof,the building constructed by granite may cause high indoor temperature,which would lead to extra air-conditioner power consumption.In view of this,this thesis performed thermal test and analysis on the typical stone masonry building in summer and green energy saving solutions are proposed and studied.Thermal environment test was performed on a typical two-story stone masonry structure building in south Fujian for 4 days constantly in summer.The test content includes solar radiation,air temperature and humidity,black global temperature,wind velocity and wall temperature.The test and analysis indicate that:(1)Thermal environment of stone masonry building is rough,where the maximum temperature is up to 33? and the maximum temperature difference between both floors is 2.3?while the difference is 1.8? at the same floor.(2)The temperature of outer surface for stone walls and roof increased rapidly under solar radiation while the temperature of inner surface was delayed for 4-6 hours due to the heat storage of the envelope.Then the temperature of inner surface is high and provide strong heat radiation during the night.(3)The wind is benefit to reduce indoor temperature and humidity and all day ventilation is suggested.A thermal neutral temperature index was based to evaluate indoor thermal environment.It is calculated that the thermal neutral temperature is 27.1?,by which indoor thermal comfort can be evaluated.It is suggested that non air conditioned room cannot qualify this thermal comfort.Considering humidity and wind velocity effects,the ground floor needs wind compensation while the first floor need active cooling.At last,Airpak simulated indoor natural ventilation and it was not good enough to form effective draughts through the building.It also studied improvement of indoor wind environment with courtyard thermal pressure ventilation as well as simulated indoor wind distribution with courtyard.The opening position and changeof height are then analyzed.The simulation based on DeST-h was conducted for simulating room temperature and analyzing energy consumption.The simulation results had shown good agreement with measured data.A further building model was established for parameters analysis.In addition to that,energy consumption before and after the modification of wall,roof,windows as well as sun shadow were compared.An optimized solution can lead to a maximum indoor temperature decrease of 1.8? and save 30%~60% of air-conditioner power consumption.The research findings and reconstruction technologies satisfy the requirement of economic and energy saving,which shall provide reference for reconstructing rural stone masonry buildings in south Fujian.