Feasibility of an Advanced Waste Heat Transportation System Using High-temperature Phase Change Material (PCM)
Feasibility of an Advanced Waste Heat Transportation System Using High-temperature Phase Change Material (PCM)
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DOI：
10.2355/isijinternational.50.1326
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发表时间：
2010-09
影响因子：
1.8
通讯作者：
T. Nomura;Teppei Oya;N. Okinaka;T. Akiyama
中科院分区：
文献类型：
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作者：
T. Nomura;Teppei Oya;N. Okinaka;T. Akiyama
利用高温相变材料（PCM）的相变潜热（LH）进行余热输送（HT）是一种有效降低CO2排放的方法。本文描述了1）使用二元低共熔混合物NaOH/Na 2CO 3作为PCM来实现HT系统，2）从能量需求、（火用）损失和CO2排放的观点出发，使用该PCM的HT系统的可行性。在这项研究中，我们研究了PCM的热物理性质和化学稳定性与参考的传热介质的HT系统通过差示扫描量热法和热重-差热分析。我们观察到NaOH/Na 2CO 3具有252 kJ/kg的熔融LH和285±1°C的熔点（MP）和凝固点（FP），其适合于HT系统。以二苄基甲苯为传热介质时，在相变过程中老化500 h后，材料的物理化学性能无明显变化。相反，在系统分析中，在所提出的系统以及在传统的供热系统中的操作数据是根据热量和物料平衡计算的。结果表明，它只有9.5%的能量需求，39.7%的火用损失，和19.6%的二氧化碳排放量的传统系统，缺乏热回收能力。
A waste-heat transportation (HT) system whose operation depends on the latent heat (LH) of high-temperature phase change material (PCM) is effective in reducing carbon dioxide (CO2) emission from industries. This paper describes 1) the use of the binary eutectic mixture NaOH/Na2CO3 as a PCM to realize the HT system, 2) the feasibility of HT system using this PCM from viewpoints of energy requirements, exergy loss, and CO2 emissions. In this study, we examined the thermophysical properties of the PCM and its chemical stability with reference to the heat transfer medium of the HT system by differential scanning calorimetry and thermogravimetry-differential thermal analysis. We observed that NaOH/Na2CO3 had a LH of fusion of 252 kJ/kg and a melting point (MP) and a freezing point (FP) of 285±1°C that was suitable for the HT system. There were no significant changes in the chemical and physical properties after aging for 500 h during phase change when dibenzyltoluene was used as the heat transfer medium. On the contrary, in the system analysis, the operating data in the proposed system—as well as in a conventional heat supply system—were calculated based on heat and material balances. The results show it has only 9.5% of the energy requirements, 39.7% of the exergy loss, and 19.6% of the CO2 emissions of conventional systems that lack heat-recovery capabilities.