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RISS 인기검색어
- 검색키워드
- 저자 : HIROYUKI KUMANO (검색결과 4 건)
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Formation Characteristics of Propane Hydrate Using Fiber Layer
HIROYUKI KUMANO,Tatsunori Asaoka,Kento Sugaya,Yuta Mochizuki,Masashi Okada 대한설비공학회 2015 International Journal of Air-Conditioning and Refr Vol.23 No.4
Formation characteristics of propane hydrate using fiber layer were investigated experimentally. Water and propane gas contact in the fiber layer, and the propane gas hydrate can be formed continuously. In the experiment, pressure, temperature, the quantity of water and porosity of the fiber layer were varied as the experimental parameters, and the formation ratio and the formation rate were measured. As a result, it was found that the high formation ratio can be obtained by using the fiber layer. Therefore, it can be said that this method is useful to reduce energy consumption and to simplify the apparatus, since it does not need circulation system. Moreover, it was found that the formation rate increases with the subcooling and the quantity of water, and it is slightly affected by the porosity of the fiber layer
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HIROYUKI KUMANO,Tatsunori Asaoka,Tatsuya Hayashi,Peng Zhang 대한설비공학회 2015 International Journal of Air-Conditioning and Refr Vol.23 No.3
The specific heat of a tetra-n-butyl ammonium bromide (TBAB) aqueous solution, the latent heat of a TBAB hydrate, and the specific enthalpy of a TBAB hydrate slurry were measured to understand the thermal storage characteristics of TBAB hydrate slurry. A solution sample and the hydrate slurry were heated, the change in temperature was measured, and the specific heat of the TBAB aqueous solution and the specific enthalpy of the hydrate slurry were obtained from the change in temperature. Two types of TBAB hydrate form. Therefore, the hydrates were separated from the hydrate slurry formed from TBAB aqueous solution having several initial concentrations. The hydrate crystals were placed into solution, and the latent heats were obtained from the temperature change of the solution. The specific enthalpy of the hydrate slurry was estimated from the latent heats of the hydrate crystals and the specific heat of the solution under phase equilibrium conditions, and the measured and estimated values were compared.
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FREEZE PROTECTION METHOD USING HOT WATER FOR PASSIVE SOLAR WATER HEATING SYSTEM
홍희기,김종현,정재동,HIROYUKI KUMANO,Douglas Reindl 대한설비공학회 2012 International Journal Of Air-Conditioning and Refr Vol.20 No.4
In the present work, a new freeze protection method is introduced with intended applications for passive solar water heaters. Though electro-thermal wire heat tracing is popularly used to prevent freezing with subsequent risk of burst, this approach is problematic due to resistance heater failure and excessive electric power consumption. In the experimental device, hot water in thermal storage tank is used to heat the outlet pipe from the tank when the surface temperature of the pipe falls lower than a pre-determined set point. The cold water pipe to the thermal storage tank is installed in direct contact with the hot water pipe, controlling its temperature by conduction with the hot water pipe.
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Flow characteristics and rheological properties of propane hydrate slurry
Ryosuke Uchida,Takashi Morimoto,Hiroyuki Kumano 대한설비공학회 2018 대한설비공학회 학술발표대회논문집 Vol.2018 No.6
Propane hydrate is crystalline solids resulting from the arrangement of water molecules linked by hydrogen bonds constituting cages around propane molecules. The propane hydrate slurry is composed of water and fine propane hydrate crystals, and is attracting as transportation and storage medium of the propane. In this study, the flow characteristics and rheological properties of the propane hydrate slurry in a circular tube were investigated. The hydrate volume fraction and the flow rate of the slurry were varied as experimental parameters. As a result, it was found that the pressure drop increases with the solid fraction and the flow rate. Furthermore, in order to evaluate the rheological properties, the relationship between shear stress and shear rate was also discussed. From the results, the propane hydrate slurry could be regarded as a Bingham fluid. Finally, the correlation to predict the apparent viscosity and the yield stress was proposed as a function of the volume fraction. Moreover, it was found that solid phase doesn’t affect the flow characteristics of the hydrate slurry in turbulent flow region.
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