巻号一覧
14 巻 (1997)
- 3 号 p. 213-
- 2 号 p. 105-
- 1 号 p. 1-
14 巻, 3 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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論文
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一宮 浩市, 福本 浩通, 宮沢 敏芳1997 年 14 巻 3 号 p. 213-220
発行日: 1997年
公開日: 2011/09/08
ジャーナル フリーPresent paper describes on the heat transfer and flow characteristics of a laminar annular impinging jet for various positions of inner-tube. In the first case, inner-tube is protruded to the flow passage. In the second case, inner-tube is retracted and relatively, outer-tube with confined insulated wall is protruded. Numerical values were obtained for the dimensionless distance between nozzle and impingement surface, H =0.5,1.0, the diameter ratio, d/D=0.2~0.6, the protrusion or retraction dimensionless length, L/H=0.0~0.8 at the Reynolds number, Re=1,000,the Prandtl number, Pr =0.72 and Grashof number, Gr = 1,000, In the first case, the flow is divided into the stagnant regionand the recirculated region in the minor flow and the major flow region. The local heat transfer for minor flow is depressed with increase of L/H. In the second case, the heat transfer increases locally with increase of L/H. Consequently, local heat transfer is controlled by combining protrusion and retraction.抄録全体を表示PDF形式でダウンロード (312K) -
第2報:サイクルシミュレーションと実機による効果の実証小島 弘, 江寺 勝, 中村 誠, 岡 雅博, 秋澤 淳, 柏木 孝夫1997 年 14 巻 3 号 p. 221-232
発行日: 1997年
公開日: 2011/09/08
ジャーナル フリーEnergy conservation is becoming important for global environmental protection. New simple techniques of more efficient1y using the waste heat of gas co-generation systems for refrigerationare required. In first report, a new method of using the low temperature waste heat for refrigeration was proposed, and the basic characteristics of the promising methods of recovering waste heat were c1arified. In this report, the more detailed simulation model of the series flow type double effect absorption refrigerator with auxiliary heat exchanger was constructed and the static characteristics were investigated. Then experiments on this advanced absorption refrigerator were carried out, and the results of the calculation and experiments were compared and discussed. Moreover, the betterment of the simulation model of this advanced absorption refrigerator was carried out.抄録全体を表示PDF形式でダウンロード (499K) -
第4報:圧縮機の振動とその伝搬制御佐野 潔, 河原 定夫, 赤沢 輝行, 石井 徳章1997 年 14 巻 3 号 p. 233-243
発行日: 1997年
公開日: 2011/09/08
ジャーナル フリーVibrations of a compressor used for domestic use air-conditioners are entirely determined by a mechanical structure of the compressor, which air transmitted to the enc10sure of the air-conditioner through insulators or pipes. Therefore the reduction of compressor vibration and the design of insulators and pipes are considered significant technical issues. In the present report, the vibrations of the scroll compressor were compared with those of various kinds of rotary compressors, thus confirming that the scroll compressor generates lower vibration than the others. Furthremore the vibration causes in the scroll compressor were carefully examined. Additionally, a method for further reduction of the scroll compressor vibration, a design of insulators and pipes, and a way of improving fatigue strength of the pipes were presented.抄録全体を表示PDF形式でダウンロード (531K) -
第5報:圧縮機の防音構造佐野 潔, 石井 徳章1997 年 14 巻 3 号 p. 245-253
発行日: 1997年
公開日: 2011/09/08
ジャーナル フリーIn order to further reduce the noises from the outdoor-unit, sound absorption and obstruction characteristics in the sound absorption structuring section are examined and the relationship between noises and cavity resonances in the interior space is clarified. The effects of the aperture prepared in the sound absorption structuring section are carefully examined, thus resulting in a large influence on sound absorption, such as the materials used for sound damping. A domestic use air-conditioner is installed in an ordinary house and the radiation of noises produced by the indoor-units and outdoor-units during cooling operation is measured. Quality of outdoor-unit noise for a domestic use air-conditioner is described.抄録全体を表示PDF形式でダウンロード (553K) -
第3報:精留器濃縮段の特性辻森 淳, 尾崎 永一, 中尾 一成1997 年 14 巻 3 号 p. 255-263
発行日: 1997年
公開日: 2011/09/08
ジャーナル フリーCharacteristic of stripping section of packed-tower type rectifierwas presentedin previous paper. In order to improve NH3 concentration inrefrigerant vapor, enriching section is considered effective. Refrigerant vapor from stripping section of rectifier and reflux solution from partial condenser flow into this section, and the proportion of solution flow rate to vapor flow rate of enriching section called reflux ratio is much smaller than that of stripping section. So the effect of reflux ratio on rectification process might be larger.
In this paper the effect of reflux flow rate and NH3 concentration in reflux solution is investigated experimentally. As a result, it was derived that the performance of enriching section was mainly decided by reflux ratio. Then the effect of rectification performance on heat rate of partial condenser and evaporator was evaluated using the experimental result of enriching section performance.抄録全体を表示PDF形式でダウンロード (396K) -
稲葉 英男, 堀部 明彦, 尾崎 公一, 横田 真希1997 年 14 巻 3 号 p. 265-276
発行日: 1997年
公開日: 2011/09/08
ジャーナル フリーThis paper has dealt with melting heat transfer characteristics of ice water slurry in an inside tube of horizontal double tube heat exchanger in which a hot water circulated in an annular gap between the inside and outside tubes. Two kinds of heat exchangers were used; one is made of acrylic resin tube for flow visualization and the other is made of stainless steel tube for melting heat transfer measurement. The result of flow visualization revealed that ice particles flowed along the top of inside tube in the ranges of small ice packing factor and low ice water slurry velocity, while ice particles diffused into the whole of tube and flowed like a plug built up by ice particles for large ice packing factor and high velocity. Moreover, it was found that the flowing ice plug was separated into numbers of small ice clusters by melting phenomenon. Experiments of melting heat transfer were carried out under some parameters of ice packing factor, ice water slurry flow rate and hot water temperature. Consequently, the correlation equation of melting heat transfer was derived as a function of those experimental parameters.抄録全体を表示PDF形式でダウンロード (703K) -
中山 佳則, 山本 勉, 高橋 裕一, 志水 康彦, 滝沢 貴久男, 山下 嗣人1997 年 14 巻 3 号 p. 277-284
発行日: 1997年
公開日: 2011/09/08
ジャーナル フリーWe conducted a continuous test with a refrigeration test circuit using HFC 134 a,and we made a study of the form and components of the sludge inside the capillary tube comparing different kinds of lubricant from this perspective. A rotary compressor was used for the test, and HAB oil, blended oil and ester oil were employed as the lubricants.
The results showed that the capillary sludge consists mainly of a copper oxide which is caused by corrosion in the case of the HAB oil, and mainly a metal soap, a decomposition product and polymeric product of the lubricant, and zeolite in the case of the ester oil. In order to decrease the amount of these sludges, it is necessary, in the former case, to remove the remaining chlorine solvents and other impurities in the constituent parts of the refrigeration test circuit and, in the latter case, to develop a stabler lubricant and zeolite. In the case of the blended oil, we discovered that zeolite and ohter substances are deposited in the capillary tube over the course of time.抄録全体を表示PDF形式でダウンロード (3043K) -
斎藤 武雄, 星 朗1997 年 14 巻 3 号 p. 285-292
発行日: 1997年
公開日: 2011/09/08
ジャーナル フリーMelting and solidification of phase change material (PCM) in a capsule is of practical importance in the latent heat thermal energy storage (LHTES) systems which are considered to be very promising for e. g. peak cut of electricity demand in the summer season. The melting process in both cylindrical and spherical capsules including melt flow in the liquid layer under inner wall temperature variation has attracted less attention until very recently. According to the experiment on the capsule bed LHTES system, the peripheral wall temperature distribution could be a key factor in close-contact melting heat transfer. In the past investigations heat conduction has been regarded as a dominant mode in the liquid film layer when the Stefan number is relatively small. And the effects of the fluid flow in the liquid film layer have not been considered. This paper presents the approximate solutions for close-contact melting with inner wall temperature variation in both horizontal cylindrical and spherical capsules. And the effects of distribution of the inner wall temperature and molten mass fraction were investigated analytically. A comparison between constant temperature and variable temperature cases was made and it was concluded that consideration of wall temperature variation is important.抄録全体を表示PDF形式でダウンロード (372K) -
大河 誠司, 斎藤 彬夫1997 年 14 巻 3 号 p. 293-301
発行日: 1997年
公開日: 2011/09/08
ジャーナル フリーIt is essential to clarify the supercooling phenomenon, as it is one of the important problem for carrying out the ice storage system, effectively. In this report, the effect of the characteristics of the surface as a heterogeneous nucleation of water was investigated. Experiments on freezing of supercooled water were carried out using various kinds of heat transfer surfaces. The type of the surface used in the experiments were, electrolyticaly polished copper surface, buffed copper surface, gold-plated surface, nickel-plated, porous copper surface, silicone surface, Teflon surface and acrylic surface. The results indicate that the probability of freezing is highly dependent upon the characteristics of the surface. However, by considering the characteristics of the surface as a density of the spots having a high ability of nucleation, it was found that the distribution of the probability of freezing for each surface can be expressed using a parameter τ. A physical meaning of the parameter τ was discussed and suggested as a function of the surface energy and the surface roughness.抄録全体を表示PDF形式でダウンロード (403K) -
斎藤 彬夫, 大河 誠司, 新谷 忠文1997 年 14 巻 3 号 p. 303-313
発行日: 1997年
公開日: 2011/09/08
ジャーナル フリーPurpose of this sturdy is to clarify the heat transfer phenomena of inorganic hydrate thermal energy storage capsule in a case of heating and cooling the capsule periodically. When the inorganic hydrate is absorbing and discharging heat periodically,heat transfer phenomena is dominated not only by thermal conduction but also by heat absorbed during melting of crystal, heat discharged during forming of crystal nuclei, crystal growth and so on. It also depends upon the highest temperature whether it is higher than the saturation temperature or not. Those phenomena can be observed in a capsule at the same time in different locations. In this report, analytical method to solve such a complex system is introduced. Gelled Glauber Salt is used as PCM. The highest and the lowest temperature of the outer surface of the capsule and rate of changing of the temperature are set to a certain value, and the experiment was carried out. The parameters used in the analysis was obtained to fit with the experimental results. Then, experiments and analysis were carried out under various conditions determined by changing the setting temperature or its cycle. The analytical results and the experimental results agreed well with each other. Hence, the adequancy of the analytical method and the heat transfer phenomena were clarified.抄録全体を表示PDF形式でダウンロード (609K)
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