| Project/Area Number |
12650770
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
反応・分離工学
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| Research Institution | Nihon University |
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Principal Investigator |
OCHI Kenji Nihon University, College of Science and Technology, Professor, 理工学部, 教授 (10059389)
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| Co-Investigator(Kenkyū-buntansha) |
KURIHARA Kiyofumi Nihon University, College of Science and Technology, Associate Professor, 理工学部, 助教授 (50186508)
TOCHIGI Katsumi Nihon University Junior College, Professor, 短期大学部, 教授 (70060027)
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| Project Period (FY) |
2000 – 2001
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| Project Status |
Completed (Fiscal Year 2001)
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| Budget Amount *help |
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2001: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 2000: ¥2,100,000 (Direct Cost: ¥2,100,000)
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| Keywords | Supercritical carbon dioxide / Heat of mixing / Heat pump |
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| Research Abstract |
This research aims at developing an environmentally benign heat pump, which utilize the large heat effect at mixing carbon dioxide with methanol at near critical point of carbon dioxide. In order to perform the research a recycle system of the fluids (carbon dioxide and methanol) has been designed to examine what amount of heats generated in mixing were effectively corrected. This examination gained the following knowledge.
1. For the mixing cell, which is the main part of this heat cycle system, a concentric tube mixer was cited to perform the flow mixing of two fluids in the vicinity of critical point of carbon dioxide (309K, 7.5MPa) regardless of the difference of fluids density. This mixing method provided the temperature increase of about 20 degree around composition of the mixture, 35mol% carbon dioxide. This heat effect corresponds to 80% of the heat of mixing confirmed by an isothermal micro calorimeter. However, the larger temperature increase has not been observed even around
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the composition of 80 mol% carbon dioxide, where the largest heat effect can be expected. The reason of this will be considered that the scale of apparatus was not enough to control finely the composition of mixture in the carbon dioxide rich region. And also the heats of mixing will be consumed in the sensible-heat of mixtures.
2. In order to separate the mixture into carbon dioxide and methanol., and to recycle them, respectively, a separate with wire netting has been designed. This device was combined with a back pressure regulator to perform preventing any entrainment methanol droplets in the carbon dioxide gas.
3. A liquification method of carbon dioxide gas from separator was examined for recycling the gas as the liquid phase. This device was made by combining a heat exchange with an adiabatic expansion of the gas. The controlling system of this liquification method has been still continued to examine.
4. The measurement of heat of mixing by a calorimeter has been also carried for searching such new fluids that the larger heat effect can be expected in the vicinity of the critical point of carbon dioxide. Less
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