巻号一覧
8 巻 (1991)
- 3 号 p. 161-
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8 巻, 1 号
選択された号の論文の9件中1～9を表示しています
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研究レビュー
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松岡 文雄1991 年 8 巻 1 号 p. 1-16
発行日: 1991年
公開日: 2011/10/11
ジャーナル フリーRecently, in many goods, new products applied by Fuzzy theory are produced.
In the refrigeration & airconditioning systems, I discussed in this paper (1) the application methods (2) the technic problems (3) key-technology.
Specially, I discussed (1) physical mechanism & Fuzzy (2) tuning tools (3) self organiging functions.抄録全体を表示PDF形式でダウンロード (662K)
論文
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媚山 政良, 竹形 清英, 橋本 良明, 川本 周朗, 大野 祥嗣1991 年 8 巻 1 号 p. 17-24
発行日: 1991年
公開日: 2011/10/11
ジャーナル フリーHIMURO type storage house, cooled by natural snow/ice, has been practically applied by means of its good storing condition and of the easy handling. As this type storage house is constructed by enough insulation structure, it can been used not only for a cool house in the summer but also a constant temperature storage house in the winter. In this paper, the authors suggested that the HIMURO type storage house might be used as the constant temperature house in the severe cold winter season after the theoretical investigation on the thermal characteristics of it. In general, the conventional type constant temperature storage house is heated by heater throughout storing period, that of this paper is self heated by the respiration heat of agricultural products stored in this house, so the house proposed in this paper look forward to smaller heat addition than that of conventional house. The practical experiment was performed to verify the theoretical investigation and to observe the storing condition of the product and we obtained enough results.抄録全体を表示PDF形式でダウンロード (415K) -
鈴木 新一, 藤澤 由裕, 中沢 壮太郎, 松岡 学1991 年 8 巻 1 号 p. 25-34
発行日: 1991年
公開日: 2011/10/11
ジャーナル フリーA new measuring method of the oil circulation ratio in the liquid line of refrigeration systems was invented by using the property of oil absorbing light.
The absorption and reference wavelengths were determined in consideration of the asorption spectra of liquid refrigerant and lubricating oil. Next, the oil circulation ratio and transmittance ratio were investigated on the effect of solution temperature in the cases of CFC-12 and HFC-134a and then were confirmed on the influence of soiled-oil and moisture.
This method is accurate and available to nonlight-absorbing CFC-12 and light-absorbing HFC134a, which requires temperature correction.抄録全体を表示PDF形式でダウンロード (458K) -
柳沢 正, 清水 孝, 福田 充宏, 水野 善仁1991 年 8 巻 1 号 p. 35-42
発行日: 1991年
公開日: 2011/10/11
ジャーナル フリーFoaming of lubricating oil in a rotary compressor induces flowing out of the oil from the compressor, which deteriorates reliability of the compressor. This study investigates foaming characteristics of oil-refrigerant mixture by using an experimental apparatus which models foaming in the compressor. The experiments reveal that the foaming caused by blade rotation can be controlled by a plate which prevents a vortex from swallowing up the vapor and that the foaming caused by vapor blow can be depressed by a blow pipe extending above the mixture. Based on these results, measures to control foaming in a practical rotary compressor are investigated by using an experimental refrigerating cycle. From measurement of the foaming, it is proved that a simple cover which separates discharge blow from the mixture under a motor has a great effect of defoaming. Collection of oil which is pumped up through a shaft is also effective in decreasing the foaming. In addition, improvement of transient performance of the cycle is obtained by controlling the foaming.抄録全体を表示PDF形式でダウンロード (452K) -
第2報: 二成分系混合冷媒のヒートポンプサイクル特性香川 澄, 上松 公彦, 渡部 康一1991 年 8 巻 1 号 p. 43-52
発行日: 1991年
公開日: 2011/10/11
ジャーナル フリーIn recent years there has been an increasing interest of the use of nonazeotropic binary mixtures to improve performance in heat pump systems, and to restrict the consumption of chlorofluorocarbon (CFC) refrigerants as internationally agreed-upon in the Montreal Protocol. However, the available knowledge on the thermophysical properties of mixtures is very much limited particularly with respect to quantitative information. In order to systematize cycle performance with Refrigerant 12 (CCl2F2) + Refrigerant 22 (CHClF2) and Refrigerant 22 + Refrigerant 114 (CClF2-CClF2) systems which are technically important halogenated refrigerant mixtures, the heat pump cycle analysis in case of using these mixtures was theoretically studied. It became clear that the maximum coefficients of performance with various pure refrigerants and binary refrigerant mixtures were obtained at the reduced condensing temperature being 0.9 when the same temperature difference between condensing and evaporating temperature was chosen.抄録全体を表示PDF形式でダウンロード (498K) -
平野 隆久, 萩本 清, 前田 光敏1991 年 8 巻 1 号 p. 53-64
発行日: 1991年
公開日: 2011/10/11
ジャーナル フリーAs the scroll profile is very effective in improving overall performance of scroll fluid machines, we have developed new scroll profile that is called the PMP (Perfect Meshing Profile). The characteristics of PMP are as follows, (1) An involute function of a circle was adapted, (2) The top clearance volume at the end of the discharging process fundamentaly becomes zero, (3) The scroll center shape can be varied by changing parameters (β: involute starting angle, n: profile parameter, δ: clearance), (4) The thickness of fixed and orbiting scroll wraps can be varied independently.
In this report, authors describe the theoretical analysis and parameters studies of PMP that have been developed for the scroll fluid machines. Further, we describe the theoretical and experimental studies on stress of the scroll inner center, performance and noise of scroll compressors that use PMP thereby effectiveness of PMP have been confirmed.抄録全体を表示PDF形式でダウンロード (545K) -
福島 正人1991 年 8 巻 1 号 p. 65-76
発行日: 1991年
公開日: 2011/10/11
ジャーナル フリーThe saturated liquid densities of two environmentally acceptable hydrogen-containing halocarbons (HCFC123 and HFC134a) and two fully halogenated chlorofluorocarbons (CFCl1 and CFC12) were determined experimentally. The measurement has been conducted by the method using pyrex glass floats.
Eleven saturated liquid densities were obtained in the range of temperature from 281 to 352 K for HCFC123. Seven saturated liquid densities were obtained in the range of temperature from 244 to 292 K for HFC134a. Eleven saturated liquid densities were obtained in the range of temperature from 285 to 361 K for CFC11. And ten saturated liquid densities were obtained in the range of temperature from 237 to 297 K for CFC12.
The uncertainties of temperature and density are less than ±20 mK and ±3 kg/m3, respectively. On the basis of these results, the saturated liquid density correlations were developed for four halocarbons. The satuated liquid densities for HCFC123 are close to those for CFC11. And the saturated liquid densities for HFC134a are smaller than those for CFC12.抄録全体を表示PDF形式でダウンロード (592K) -
高松 洋, 桃木 悟, 平岡 晋, 小山 繁, 藤井 哲1991 年 8 巻 1 号 p. 77-82
発行日: 1991年
公開日: 2011/10/11
ジャーナル フリーA comparison of heat transfer coefficient between a clean and fouled tube is made on the evaporation of HCFC22, HFC134a, CFC12 and CFC114 in a 6m long, 7.9mm ID smooth tube. The experiment is performed with a double pipe evaporator, where heating water flows in the outer annulus either countercurrently or parallel to the refrigerant flow direction. The heat transfer coefficient of a fouled tube is about 1.5∼2 times as large as that of a clean tube for the same pressure, mass velocity, heat flux and quality. However, at low heat flux and high quality region in the parallel flow, the heat transfer coefficient of a clean tube is slightly higher than that of a fouled tube.抄録全体を表示PDF形式でダウンロード (280K) -
岩渕 牧男, 柳 謙一, 橋本 律男, 高橋 恭郎, 曽田 正浩1991 年 8 巻 1 号 p. 83-90
発行日: 1991年
公開日: 2011/10/11
ジャーナル フリーThis paper describes an experimental investigation into the condensation of binary vapor flowing horizontally across the ideal tube bundle. For both cases of water-ethanol and water-methanol, data have been obtained at the near atmospheric pressure for vapor mole fraction in the range of 0-1 and at the vapor approach velocities in the range of 2-10 m/s for water-ethanol and 5-6 m/s for water-methanol. The results show that the heat transfer coefficient has a characteristic relationship with the mole fraction of the volatile species in the vapor. This relationship is considered to be caused by the gas phase mass transfer resistances. The results are also compared with the some theories for the binary vapor condensation.抄録全体を表示PDF形式でダウンロード (366K)
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