Preparation And Packaging Of The Inorganic Phase Change Materials For Town Building In Cold Region

Many families still utilizefirewall for keeping warm in the countyside in the coldregion of China.Firewood, coal and other fuels in the kang or stove is combusted，whichproduced the flue gas with high temperature from flowing inside the firewall, throughthe chimney emissions into the atmosphere. High temperature flue gas heat cannot befully utilized, many calories are lost with the flue gas to the outside. However, theexisting firewall cannot store heat to result in faster cooled firewall, given people warmin cold area inconvenience.In order to maximize the use of heat of the high temperature flue gas, to saveenergy, a device designed in this paper, and the inorganic phase change materials wereencapsulated within the device. Inorganic phase change materials with the energystorage and release performance were packaged，which were placed in a firewall to playfull use of energy,and the effect of regulating the room temperature.By means of aspecial package design, high temperature flue gas to maximize energy absorption andrelease as much heat into the room, which serves the purpose of savingenergy.The four inorganic phase change material were selected, which were made amodificationby thickening agent method and nucleating agent method toimproveeffectively phase segregation and supercooling.The long-term performance ofeach material was investigated, which included rate of volume change and thermalcycling stability.The phase change latent heat of four inorganic phase change material weremeasured after500thermal cycles by DSC method, the results show that the latent heatslight losswith increasing number of thermal cycles.The determination of the value of alatent heat with50thermal cycles, through the use of mathematical fitting each givenlinear fitting formula, in order to describe the relationship between the inorganic phasechange material latent heat and cold cycles.A measuring device was designed to measure the volume ratio of the inorganicmaterialsinthe phase change.Tests showed that the volume expansion of four inorganicphase change materials from a solid to a liquid in the phase transition was higher.Considering the phase change material volume expansion, the modified inorganicphase change materialswith the fine long-term performance were encapsulated in thepackaging device. In order to promote a more rational and applications, we also studythe performance ofstorage and release of energy of the inorganic phase change materialscontained encapsulated device, and givethe energy storage and release time of fourinorganic phase change materialswith package design size in the test device.