\r王飞波^{1, 2}，孟祥瑞^{1, 2}，李敏霞^{1, 2}，马一太\r^{1, 2}\r
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AuthorsHTML:\r王飞波^{1, 2}，孟祥瑞^{1, 2}，李敏霞^{1, 2}，马一太\r^{1, 2}\r
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AuthorsListE:\rWang Feibo^{1, 2}，Meng Xiangrui^{1, 2}，Li Minxia^{1, 2}，Ma Yitai\r^{1, 2}\r
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AuthorsHTMLE:\rWang Feibo^{1, 2}，Meng Xiangrui^{1, 2}，Li Minxia^{1, 2}，Ma Yitai\r^{1, 2}\r
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Unit:\r\r1. 天津大学机械工程学院，天津 300350；\r
\r\r2. 天津大学中低温热能高效利用教育部重点实验室，天津 300350\r
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Unit_EngLish:\r1. School of Mechanical Engineering，Tianjin University，Tianjin 300350，China；
2. Key Laboratory of Efficient Utilization of Low and Medium Grade Energy of Ministry of Education，Tianjin University，Tianjin 300350，China\r
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Abstract_Chinese:\r \r\r\r糖醇由于具有高热能存储密度、价格低廉、无毒、无腐蚀性等优点在热能存储领域中有较好的应用前景\r.\r为拓宽糖醇材料相变温度范围，同时获得较高的相变潜热，提高重结晶性，使其更加适用于中低温相变储能，对一元糖醇赤藓糖醇、木糖醇、山梨糖醇、甘露醇和多元共晶糖醇及混合糖醇的蓄放热性能进行实验研究\r. \r实验结果表明：赤藓糖醇和甘露醇在中低温相变储能中的实际工程应用性较强；多元共晶糖醇体系熔点较一元糖醇降低，部分多元共晶糖醇体系的熔化潜热较一元糖醇升高，赤藓糖醇\r-\r甘露醇二元共晶体系较一元甘露醇熔点降低\r30.9\r%\r，熔化潜热提高\r12\r%\r，但是所有多元共晶体系重结晶性均变差，在降温过程中均未出现凝固结晶现象；甘露醇对于赤藓糖醇\r-\r甘露醇二元共晶体系具有一定的成核剂作用，可以提高其重结晶性\r. \r研制了一种新型混合糖醇相变储能材料，即甘露醇与赤藓糖醇的摩尔比为\r1.1\r的混合物，其熔化温度范围\r112.47\r～\r156.88℃，熔化潜热271.71J/g，凝固温度范围77.05～47.48℃，凝固潜热158.6J/g，且DSC凝固曲线双峰部分重叠，经过50次升降温过程，其熔化潜热仅损失2.8%，凝固潜热仅损失3.6%，重结晶性较好；在25～100℃的温度区间内，随着温度的升高，混合物材料的准稳态比热容在0.990～1.010J/(g·℃)之间总体上呈现出先减后增的趋势，作为相变储能材料在实际工程中的应用性较强.\r\r
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Abstract_English:\r\rSugar alcohols have a good application prospect in the field of thermal energy storage because of their high advantages, such as thermal energy storage density, low cost, non-toxicity, and non-corrosiveness. To broaden the phase-transition temperature range of sugar alcohol materials and obtain a higher latent heat of phase change, improve recrystallization, and make it more suitable for low- and medium-temperature phase-change energy storage, the thermal energy storage and release performance of erythritol, xylitol, sorbitol, mannitol, poly-eutectic sugar alcohols, and sugar alcohol mixtures were studied experimentally. Experimental results show that erythritol and mannitol have strong engineering application in low- and medium-temperature phase-change energy storage; the melting point of the poly-eutectic sugar alcohol system is lower than that of the unitary sugar alcohol, melting latent heat of some poly-eutectic sugar alcohol systems is higher than that of the unitary sugar alcohol, melting point of erythritol-mannitol binary eutectic system is 30.9% lower than that of the mono-mannitol system, and melting latent heat is 12% higher; however, the recrystallization of all poly-eutectic sugar alcohol systems is poor, and no solidification phenomenon occurs during the cooling process; mannitol has a certain nucleating agent effect on the erythritol-mannitol binary eutectic system and can improve its recrystallization. Herein, a new type of mixed sugar alcohol phase-change energy storage material was developed. The molar ratio of mannitol to erythritol is 1.1, melting temperature range is 112.47\r—\r156.88℃, latent heat of fusion is 271.71 J/g, solidification temperature range is 77.05—47.48℃, latent heat of solidification is 158.6 J/g, and double peaks of differential scanning calorimetry (DSC) solidification curve partially overlap. The melting latent heat loss is only 2.8% and solidification latent heat loss is only 3.6% after 50 times heating and cooling processes, and the recrystallization is good. In the temperature range of 25—100℃, with the increase of temperature, the quasi-static specific heat capacity of the mixtures decreases first and then increases between 0.990 and 1.010 J/(g·℃). As a phase-change energy storage material, the developed material has strong application in practical engineering.\r\r
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Keyword_Chinese:糖醇；相变材料；熔化；凝固；储能\r

Keywords_English:sugar alcohol；phase change material；melting；solidification；energy storage\r


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