巻号一覧
19 巻 (2002)
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19 巻, 1 号
選択された号の論文の10件中1～10を表示しています
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研究レビュー
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長友 繁美2002 年 19 巻 1 号 p. 1-11
発行日: 2002年
公開日: 2011/10/11
ジャーナル フリーThe household refrigerator is one of the most important and the biggest energy-consuming home appliances. This paper summarize recent refrigeration cycle developments in the field of domestic household refrigerators based on a survey of publications.抄録全体を表示PDF形式でダウンロード (656K)
論文
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稲葉 英男, 金 明俊, 堀部 明彦2002 年 19 巻 1 号 p. 13-22
発行日: 2002年
公開日: 2011/10/11
ジャーナル フリーThe present experiments have been performed for obtaining the melting heat transfer characteristics of micro-encapsulated solid-liquid phase change material and water mixed slurry flow in a circular tube heated with constant wall heat flux. The phase change material having a low melting point was selected for a domestic cooling system in the present study. The governing parameters were found to be latent heat material concentration,heat,flux,and the slurry velocity. The experimental results revealed that the mean heat transfer coefficient of latent microcapsule slurry was about l.3~l.8 times greater than that of the single phase of water. Moreover the effectiveness of heat transfer coefficient to friction factor had a maximum at latent heat material concentration of 25%.抄録全体を表示PDF形式でダウンロード (710K) -
小山 繁, 中下 功一, 桑原 憲, 山本 憲2002 年 19 巻 1 号 p. 23-31
発行日: 2002年
公開日: 2011/10/11
ジャーナル フリーIn the present study, the heat transfer characteristics are investigated experimentally for condensation of pure refrigerant HFC134a in a 955 mm long multi-port extruded tube of 0.72 mm in hydraulic diameter. The experiments were carried out in the ranges of mass velocity of G = 100∼700 kg/m2s and vapor quality of x = 1.0∼0.0 at a constant inlet pressure of 1.7MPa.The refrigerant mass flow rate and the total pressure drop over the test tube were measured. The wall temperature and the wall heat flux in every 75 mm long subsection were also measured. At first, a correlation for local frictional pressure drop, which is assumed to be the same functional form as the Chisholm correlation, is obtained from the measured total pressure drop. Next, the local heat transfer coefficient in every subsection was evaluated. Then, data of the local heat transfer coefficient were compared with correlations of Haraguchi et al. (1994) and Moser et al. (1998).抄録全体を表示PDF形式でダウンロード (509K) -
中沢 宣明, 河村 光隆, 関屋 章, 大竹 勝人, 玉井 良一, 黒河 勇治, 村田 潤治2002 年 19 巻 1 号 p. 33-41
発行日: 2002年
公開日: 2011/10/11
ジャーナル フリーThe liquid viscosities of thirteen fluorinated dialkylethers which are expected as promising candidates of CFC alternatives were measured at temperatures from 276 K to 328 K and atmospheric pressure. The fluorinated dialkylethers used in this study are 1-methoxy-1, 1, 2, 2- tetrafluoroethane; 1-difluoromethoxy- 1, 1 , 2 -trifluoroethane; 1-methoxy-1, 1 , 2 , 2 , 3 , 3 -hexafluoropropane; 1-methoxy-1-trifluoro-methyl-2, 2 , 2-trifluoroethane; 1-difluoro-methoxy-2, 2, 3, 3-tetrafluoropropane; 1-(2, 2, 2-trifruoroethoxy)-1, 1, 2, 2-tetrafluoroethane 1-difluoromethoxy-2, 2, 3, 3, 3-pentafluoropropane 1-methoxy-2, 2, 3, 3 -tetrafluoropropane; 1-methoxy-1, 1, 2, 2, 3, 3, 3-heptafluoropropane; 1-pentafluoroethoxy-1, 1, 2, 2-tetrafluoroethane; 2-trifluoromethoxy-1, 1, 1, 2-tetrafluorobutane; 1-proxy-nonafluorobutane; and 1-ethoxyundeca-fluoropentane. The liquid viscosities have been measured by the torsionally vibrating viscometer (YAMAICHI DENKI, F VM-80A) within an uncertainty of ±3%.The liquid viscosities of those compounds decrease exponentially with increase of temperature.抄録全体を表示PDF形式でダウンロード (442K) -
濱本 芳徳, 長野 龍彦, 山田 純, 秋澤 淳, 柏木 孝夫2002 年 19 巻 1 号 p. 43-51
発行日: 2002年
公開日: 2011/10/11
ジャーナル フリーThin film mode in ammonia-water absorption systems provides relatively high heat transfer coefficients and is stable during operation. However, thin film mode needs good liquid distributors. Bubble mode provides not only high heat transfer coefficients but also good mixing effect between the liquid and the vapor. The objective of this paper are to develop a design model for a bubble absorber with plate heat exchangers, to evaluate a simultaneous heat and mass transfer within both liquid and bubble and to clarify significant factors for a design of a ammonia-water bubble absorber. This analysis used experimental correlation from previous study of ammonia-water bubble absorption. It was clarified that heat transfer coefficient of wall in the absorber was a dominant factor in the heat transfer resistance of absorber, and a mass transfer enhancement depended on the inlet flow rate of vapor.
The number of orifice in the absorber and inlet flow rate of liquid solution had influence on the height of absorber, but the orifice diameter had relatively a little influence. There were optimum conditions that the height of absorber reached at minimum, for the inlet flow rates of liquid solution抄録全体を表示PDF形式でダウンロード (456K) -
熊野 寛之, 斎藤 彬夫, 大河 誠司2002 年 19 巻 1 号 p. 53-62
発行日: 2002年
公開日: 2011/10/11
ジャーナル フリーIn this study, direct contact melting with asymmetric load is investigated analytically. Three types of boundary conditions, that is, the constant temperature at the top, the constant heat flux at the bottom, and the constant heat transfer coefficient and the constant temperature of the medium at the bottom of the heating plate were examined. In the calculation, the asymmetric load was acted on the top of the solid. The melting process progressed keeping the force balance between the pressure in the liquid film and the loads at all times. The pressure distribution in the liquid film formed asymmetrically to keep the force balance. Non-dimensional parameters were specified through formulating the non-dimensional governing equations. The effects of these parameters for each condition were investigated. As a result, it was found that an average heat flux into the solid was independent of the moment acting to the solid for each condition. However, the inclination of the solid increased with the amount of the moment. In the case of the heating conditions at the bottom of the heating plate, the inclination of the solid depended on the thermal conductivity of the heating plate, and increased with the thermal conductivity.抄録全体を表示PDF形式でダウンロード (615K) -
楊 開新, 吉川 浩行, 太田 照和2002 年 19 巻 1 号 p. 63-71
発行日: 2002年
公開日: 2011/10/11
ジャーナル フリーNumerical simulations have been carried out on staggered elliptic tube banks at low Reynolds numbers. Details of the flow and heat transfer characteristics in the tube banks are clarified for the fully developed flow state under the condition of uniform heat flux. The pressure loss coefficient, the local and mean Nusselt numbers, and the skin friction coefficient are presented along with the flow and temperature fields. The effects of the longitudinal and transversal pitch ratios and the axis ratio upon them are made clear. It is found that the pressure loss across an elliptic tube and the mean Nusselt number decrease for a larger longitudinal pitch. An increase of the transversal pitch causes a decrease of the pressure loss. On the other hand, the mean Nusselt number reaches a maximum at a certain transversal pitch ratio in the axis ratio range from 1.5 to 3.0. The axis ratio also greatly affects these characteristics.抄録全体を表示PDF形式でダウンロード (4073K) -
小松原 健夫, 小保方 芳信2002 年 19 巻 1 号 p. 73-81
発行日: 2002年
公開日: 2011/10/11
ジャーナル フリーRecently inverter speed control for room air conditioners has been expanding to control room temperature precisely and to save energy. Therefore high efficiency and high reliability of compressors under wide range from low speed to high speed operation are required. To achieve these requirements improvement of mechanical design and adoption of a reliable light weight material for the moving parts have been researched. In this paper we discuss the research progress of Metal Matrix Composite (MMC) as a high strength, reliable light weight material and the results of the development of Fiber Reinforced Aluminum Alloy (FR-Al) for the moving parts. And we also discuss mechanical and physical properties of the FR-Al, merit of using the FR-Al in rotary compressors as the roller and the vane, and tribological and reliability evaluation of the FR-Al applied in Hydrofluorocarbon (HFC) refrigerant and polyolester lubricant atmosphere.抄録全体を表示PDF形式でダウンロード (529K) -
内田 麻理, 伊藤 正昭, 鹿園 直毅2002 年 19 巻 1 号 p. 83-90
発行日: 2002年
公開日: 2011/10/11
ジャーナル フリーThe evaporation of a zeotropic refrigerant (R 407 C) inside horizontal tubes has been investigated experimentally using two types of new cross-grooved tubes and a conventional single-grooved tube. The cross-grooved tubes were formed by varying the helix angle of a second set of grooves whose fin height was the same as that of the first set. The evaporation in the two types of cross-grooved tubes was compared with that in a smooth surface tube. At low mass flows, the improved cross-grooved tube (second helix angle β2 = 0 °) has shown higher evaporative heat transfer coefficients than the single-grooved tube, but at higher mass flows the single-grooved tube has shown higher. The pressure drop of the cross-grooved tube (second helix angle β2 = -30°) is greater than that of the improved cross-grooved tube.抄録全体を表示PDF形式でダウンロード (551K) -
斎藤 彬夫, 大河 誠司, 滝口 裕之, 熊野 寛之, 宝積 勉2002 年 19 巻 1 号 p. 91-100
発行日: 2002年
公開日: 2011/10/11
ジャーナル フリーThis study is on propagation process of ice on solid surface. A single ice crystal was used and propagation was started by letting the tip of the ice to touch the surface in supercooled water due to free growth of the crystal. Parameters, such as degree of supercooling, surface roughness by different degree of polishing, surface property by existence or non-existence of oxidation, direction of c-axis of as ingle ice crystal and thermal properties of solid material, were selected, and the effect on the velocity of propagation was investigated, experimentally. It was found that propagation is faster on the direction perpendicular to the c-axis of the crystal. It was also found that in a case of copper surface, dislocation of ice occurs quickly and correlation between the direction of the crystal and the speed of propagation on the surface disappears. In a case of linearly polished copper surface, if the amplitude of roughness is big enough, having an equivalent order of the thickness of the tip of ice, it was found that the propagation is faster in the direction parallel to the line of polishing than the direction normal to the line. Finally, using copper, stainless steel and polycarbonate as a material for the surface, it was also found that speed of propagation depends on the material.抄録全体を表示PDF形式でダウンロード (677K)
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