Application Of The Phase Change Material In The Envelope Of Container Buildings For Heat Enduring Performance In Summer

The container building is the assembly building with the highest assembly rate.The promotion of container construction can solve the problem of overcapacity in China's container manufacturing and reuse of lots of second-hand containers,which will help to upgrade the construction industrialization in China.But the heat enduring performance of container building envelope is unsatisfactory in summer,which has become a bottleneck restricting the development of container building,and urgently needs a kind of light energy storage material with high energy storage capacity.Through the analysis of the existing research results,the phase change material?PCM?have great potential in solving the problem of overheating in the container office buildings in summer.Based on the DesignBuilder building energy simulation software,the paper studies the application of microencapsulated paraffin wax phase change material in improving the heat enduring performance of container office building envelope in summer.The enthalpy method and the EnergyPlus finite element difference algorithm are used to simulate the operation effect of phase change materials in the building.The influence law of internal disturbance,phase melting point,relative position and thickness of phase change layer on the temperature regulation performance of PCM and corresponding weights are studied.The optimal PCM composite wall with polyurethane?PUR?insulation is obtained.The simulation results show that the PCM composite wall can significantly reduce the indoor temperature fluctuation in the container building in summer,and the average indoor temperature is controlled at about 27?.Compared with the PUR internal insulation wall construction,the temperature modulation of PCM reduces the indoor overheat,I_DCT and I_DCC by 55%and 63%respectively.The energy consumption of different refrigerating strategies of PCM composite wall combined with active refrigeration equipment is further explored.The results show that the existence of PCM greatly reduces the cooling load of air conditioning in summer.Compared with the PUR internal insulation wall construction,the energy consumption of refrigeration was reduced by 58%,which could be reduced by 62%if combined with night ventilation.The results show that phase change material is an ideal light energy storage material to solve the problem of overheating in the container building in summer.Using PCM as a lightweight thermal storage layer for container office buildings can significantly improve the energy storage capacity of building envelope in summer,reduce energy consumption and enhance indoor thermal comfort.The research results provide theoretical basis and technical support for further promoting the application of the PCM in container building envelope and the development of container buildings.