Performance Optimization Study On Organic Thermal Storage Materials For Intermittent Self-heating Building

The heating system of heating buildings in the cold regions in China, the ratio of energy utilization is low, relatively comfortable living is not ideal, but the phase change material can take advantage of the performance of the phase change process to absorb or release heat, effectively save energy consumption, and provide a comfortable living environment. This paper mainly studied the phase change material that suitable for use in cold regions of40℃~70℃.In this paper, the organic phase change material was used, the organic phase change material used for differential scanning calorimetry test, the test volume expansion and thermal cycle test，chose a better thermo-physical properties of the five material, named lauric acid, myristic acid, palmitic acid, stearic acid and myristyl alcohol. By measuring changes in the volume of the phase transition, the volume expansion coefficient of these types of materials were about10%, confirmed the thermal stability of the organic phase change material by the thermal cycle test.In order to improve the heat conduction performance of the organic phase change materials, adding the expanded graphite and copper foam in order to enhance the thermal conductivity. By tablet thermal conductivity detector and the method of measuring time-temperature curve to measure the relevant thermal performance and analyzed. Eventually found that graphite, copper mesh and copper foam can effectively improve the thermal properties of the organic phase change material.By differential scanning calorimetry test the different components of the thermal conductive materials for the influence of the organic phase change materials thermal properties.Respectively by adding halogenated flame retardants and expansion flame retardants, the expanded graphite as a synergistic flame retardant, study the effects of flame retardant on flame retardant properties of organic phase change materials. By way of ignition tests, proved the flame retardant is very effective for improving the flame retardancy of the organic phase change material. Also found that the addition of the expanded graphite further improve the flame retardant properties, and by the methods of thermal gravimetric analysis, infrared spectroscopy, time-temperature curve and differential scanning calorimetry, thermal stability of the flame retardant system, verify the material under high temperature did not degeneration, thermal conductivity and related to thermal physical properties were researched, further analysis of the mechanism of flame retardant.