Application Study Of Phase Change Materials In Building External Wall

The wall as interface which interior directly interacts with the outside is one of the main building energy consumption,thereby increasing the thermal insulation effect of the wall,is an important way to achieve energy efficiency in buildings.In recent years,the phase change material combine with traditional building materials used in the construction of the wall of the building envelope to reduce building energy consumption and negative environmental impacts.Used in energy saving,improve indoor comfort research more widely,but it was being in the theoretical analysis and simulation analysis phase.Analysis of the meaning of energy-savings about the phase change material matrix composites and building materials used in the construction of the wall envelope is little,for this issue to explore the modern phase change materials used in the external walls of the research and promotion of great significance.The purpose of this study is to explore phase change materials used in building facades and medial or inside,the outer sides of the energy saving effect of the compound wall.This paper discusses the phase change materials used in construction and or inside,the outer sides of the wall at different thermal compound wall,energy-saving effect under different heating rates and different conditions of phase change material content inside of an exterior wall.Then,on the basis of this study,choose a better rate about thermostat,change the temperature of the wall on either side,and to test the heat transfer coefficient of the phase change materials used in the inside wall pieces and large exterior wall or both sides of the wall,and examine its saving-rate meets the subtropical region facades energy efficiency standards.The effect of energy saving exterior wall and the inner wall,the outer sides are wiped phase change material test results show with the increasing in the thermal resistance of sandwich panels.Heat transfer coefficient of phase change composite wall is reducing,energy-saving rate increasing.With increasing content of the phase change material on the exterior wall,heat transfer coefficient of phase change energy storage compound wall reduces,energy-saving rate increases.Exterior wall plastering phase change material composite wall at a heating rate of 1.3?/h,the inorganic board and phase transition board composite with a sandwich,panels of thermal resistance is 0.67 m2 · K/W,phase change energy-saving composite wall is best.At this point the energy saving rate is,in the energy saving rate based on 50%benchmark wall energy saving 38.2%.The medial wall and inner,outer sides are wiped phase change composite wall material,at a heating rate of 2.40C/h,phase transition board composite with a sandwich panels of thermal resistance is 0.8 m2 · K/W,phase change energy-saving composite wall is best.At this point the energy saving rate is,in the energy saving rate based on 50%benchmark wall energy saving 69.6%.With increasing content of the phase change material on the exterior wall,heat transfer coefficient of phase change energy storage compound wall reduces,energy-saving rate increases.The foundation wall with aerated concrete block as wall material,posted on the outside heat preservation decorative materials,add in the case of phase change mortar,meet on the exterior wall building energy-saving rate of 50%requirements.Posted on the outside heat preservation decorative materials,add in the case of phase change mortar,compared with the external walls of the building energy saving rate as the benchmark wall 50%,heat transfer coefficient decrease 50.1%,the actual effect of energy saving wall can reach 75%,to meet the energy saving effect of external wall of building 65%requirements.In the medial and lateral wall are wiped under the condition of phase change mortar,compared with the external walls of the building energy savingrate as the benchmark wall 50%,heat transfer coefficient decrease 29.85%,the actual effect of energy saving wall can reach 65%,to meet the energy saving effect of external wall of building 65%requirements.