| Popis: |
In this paper, ternary composite paraffin was used as raw material, vitrified microsphere and expanded pearlite were used as carrier, styrene-acrylic emulsion and EVA emulsion as encapsulated to prepare phase change energy storage mortar. According to paraffin adsorption capacity, leakage and other performance tests , the appropriate carrier and encapsulate materials were selected . The results show that, through both temperature-time curve test and DSC analysis, the best ratio of 3# paraffin to n-tetradecane to solid paraffin is 1:2:7. Vitrified microsphere as carrier, the amount of paraffin under vacuum adsorption condition for 30mins is 502.2% which is much higher than that of expanded pearlite. Styrene-acrylic emulsion as encapsulate material, the leakage of paraffin problem can be solved effectively, and in this case, the minimum leakage of paraffin/vitrified microsphere is only 4.42%. The compressive strength of paraffin/vitrified microsphere phase change energy storage mortar is 5.35 MPa, the thermal conductivity is 0.3372 W/m·K which improved the insulation performance of mortar significantly. |
