| Project/Area Number |
14350309
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Architectural environment/equipment
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| Research Institution | HOKKAIDO UNIVERSITY |
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Principal Investigator |
NAGANO Katsunori Hokkaido Univ., Grad School of Eng., Asso.Prof., 大学院・工学研究科, 助教授 (80208032)
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| Co-Investigator(Kenkyū-buntansha) |
HAMADA Yasuhiro Hokkaido Univ., Grad.School of Eng., Asso.Prof., 大学院・工学研究科, 助教授 (40280846)
KUBOTA Hideki Hokkaido Univ., Grad.School of Eng., Prof., 大学院・工学研究科, 教授 (90002930)
MOCHIDA Tohru Hokkaido Univ., Grad.School of Eng., Eme.Prof., 名誉教授 (40002050)
HAYASHI Kanetoshi JFE Engineering Corp., Engineering Research Center, Chief Scientist, エンジニアリング研究所, 主任研究員
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| Project Period (FY) |
2002 – 2003
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| Project Status |
Completed (Fiscal Year 2003)
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| Budget Amount *help |
¥14,200,000 (Direct Cost: ¥14,200,000)
Fiscal Year 2003: ¥4,100,000 (Direct Cost: ¥4,100,000)
Fiscal Year 2002: ¥10,100,000 (Direct Cost: ¥10,100,000)
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| Keywords | Latent heat storage / PCM / Phase change / Thermal energy storage / Fuel cell / Exhaust heat / Durability / Hot water supply system / 廃熱 |
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| Research Abstract |
We focused on a mixture of magnesium nitrate hexahydrate ass base material and magnesium chloride hexahydrate as an additive to store in order to utilize urban waste heat from emerged co-generation systems, typically available at temperatures of 60-90℃ Addition of 5-10 wt% of the latter resulted in a modulated melting point of around 80℃ and a heat of fusion around 150 kJ/kg. Increasing the mix ratio allowed the melting point to be decreased to 60℃, whereas it caused little change of heat of fusion. Repeat tests showed that the heat of fusion and melting point retained their original values after 1000 cycles. Results from corrosion tests showed SUS316 and aluminum can be used as build storage tanks or heat exchangers for the mixture.
A high efficient solar hot water supply system with PCM/water hybrid thermal energy storage system was proposed. A demonstration facility which provides 70 evacuated solar collector tubes and a water tank of 250L and a PCM tank of 76L, was constructed. Measurements were reproduced by calculations in terms of minimum points of consumed energy for auxiliary heating. The points existed around 0.3 to 0.4 of the ratio of PCM capacity to total capacity. The solar thermal system could cover 60% of the annual heat demand for hot water supply in Sapporo, Japan Moreover, over 70% of the heat demand can be covered by the system in other southern cities of Japan.
Microcapsule Slurry PCM (MCS-PCM) was also applied to the system. The highest performance was shown under conditions with rectangle fins because of the effect of natural convection, whereas round shape fins had the advantage in conditions with a solid PCM. The results of experiments using an actual storage tank showed that 15% larger heat can be recovered in the PCM storage compared to the water storage at the flow rate of 7L/min.
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