PCM을 利用한 에너지 저장에 關한 硏究 = A Study on the Energy Storage Utilizing the PCM

국문 초록 (Abstract)

本 硏究는 PCM混合物의 life cycle에 관한 熱特性과 수직 Annulus PCM 熱交換器의 內側으로 흐르는 傳熱流體의 流量 및 流入溫度 變化에 따른 PCM의 溶融效果 및 傳熱特性에 관한 實驗으로, PCM으로 Glauber's salt를 選定하고, thickner로 Celite를 添加하여 PCM 混合物의 沈降分離防止實驗을 遂行하였으며, 傳熱流體의 流量 及 流入溫度를 變化시켜, PCM, Tube Wall 및 流體溫度를 測定하여, 溶融 PCM이 熱을 吸收時, melting time과 heat flux의 關係를 考察하였다. 實驗結果 PCM 混合物은 70.5wt%의 Glauber's salt에 thickner로 0.25wt%의 Celite를 添加時 沈降 현상을 나타내지 않았다. 傳熱流體의 流量이 일정할 때, melting time은 流體의 流入溫度에 대해 log-log 座標에서 2.45의 기울기로 감소하였고, 傳熱流體의 流入溫度가 일정할 때, melting time은 流體의 流量變化에 대해 log-log 座標에서 0.56의 기울기로 감소하였다. 또한 流體의 流入溫度가 melting time에 미치는 영향은 流量變化에 의한 경우보다 相對的으로 현저하였다.

다국어 초록 (Multilingual Abstract)

This is concerned with study on the life cycle of PCM mixture and on the melting effect and heat transfer characteristics of PCM with variation of massflowrate and inlet temperature of heat transfer fluid flowing inside the vertical annulus PCM heat exchanger. Glauber's salt was used as PCM and separation experiment of precipitation for PCM mixture was done by addition of celite as thickner. The PCM, tube wall, and fluid temperature were measured by the change of fluid massflowrate and fluid inlet temperature, and correlation between the melting time and heat flux were discussed when melting PCM absorbs heat. Experimental results show that PCM mixture containing 10.5 weight percent of Glauber's salt and 0.25 weight percent of celite as thickner has no precipitation phenomenon. And also, when the fluid massflowrate is constant, the melting time of PCM was decreased to the fluid temperature with the slope of 2.45 in the log-log coordinate.
The fluid temperature constant, melting time was decreased to the fluid massflowrate with the slope of 0.56 in the log-log coordinate. The influence of fluid temperature on the melting time is relatively remarkable than that of fluid massflowrate.

목차 (Table of Contents)

• Ⅰ.序論
• Ⅱ.理論的 背景
• 1.層流
• 2.亂流
• Ⅲ.實驗裝置 및 實驗方法
• 1.PCM 混合物의 特性實驗
• 2.PCM 熱交換器의 溶融實驗
• Ⅳ.實驗結果 및 考察
• 1.PCM 混合物의 熱特性實驗
• 2.PCM 熱交換器의 溶融實驗
• Ⅴ.結論