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Volume 12 (1995)
- Issue 3 Pages 225-
- Issue 2 Pages 135-
- Issue 1 Pages 1-
Volume 12, Issue 3
Displaying 1-10 of 10 articles from this issue
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Masato FUKUSHIMA1995 Volume 12 Issue 3 Pages 225-239
Published: 1995
Released on J-STAGE: September 08, 2011
JOURNAL FREE ACCESSThe use of refrigerant mixtures for R22 alternative has recently been attracted in refrigerating and air conditioning industry. However, there has not been enough information about thermodynamic properties required to analyse the properties of mixtures. In this paper, stressing the adaptability of the modified van der Waals equation of state for refrigerant mixtures, the prediction methods of thermodynamic properties for the a1ternative refrigerant and mixture are explained. Seven generalized equations of state are chosen for the subjects of discussion. Data on R32,R125,R134a and their mixtures are applied to discuss the adaptability of these equations. Resu1ts of calculation using these equations are compared with available experimental and reference data. The optimum binary interaction parameters for those equations of state are a1so presented.View full abstractDownload PDF (745K) -
Elisa C. BOELMAN, Takao KASHIWAGI1995 Volume 12 Issue 3 Pages 241-252
Published: 1995
Released on J-STAGE: September 08, 2011
JOURNAL FREE ACCESSAn overview is given of closed cycle solid sorption cooling applications for air-conditioning, refrigeration and cryogenics. The main applications are outlined, and the suitability of sorbent refrigerant pairs to temperature ranges is indicated. The use of cycles with heat recovery and with near-environmental temperature heat sources is discussed. Development efforts on cycles, coolers and elemental technologies are also outlined.View full abstractDownload PDF (739K)
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1st Report : Stable Control of Supercooling Water and Ice MakingMitsuru MORIYA, Masayuki TANINO, Sakae KIKUCHI, Toshio HAYASHI, Tokio ...1995 Volume 12 Issue 3 Pages 253-262
Published: 1995
Released on J-STAGE: September 08, 2011
JOURNAL FREE ACCESSAn ice storage system using supercooled water has been developed. In this system, only water is circulated and slurry-ice is stored in tanks. Since one of the critical components of the system is the supercooing heat exchanger, the first step in component development consisted in verification of stable conditions for supercooling water control by basic and integrated experiments. The results of these experiments yielded designcriteria concerning the degree of wall supercooling and the inlet water temperatures (i.e.,conditions for absence of ice nuclei). In addition, realistic operating techniques for supercooling heat exchangers with redundancy have been demonstrated by the field experiment.View full abstractDownload PDF (459K) -
2st Report : Ice Storage and Melting CharacteristicsMitsuru MORIYA, Masayuki TANINO, Sakae KIKUCHI, Toshio HAYASHI, Tokio ...1995 Volume 12 Issue 3 Pages 263-273
Published: 1995
Released on J-STAGE: September 08, 2011
JOURNAL FREE ACCESSThe storage and melting characteristics of slurry-ice mixtures in several tanks were investigated exprimentally. For ice storage processes, three different kinds ofice-feeding methods were tested in connection with the fluidizable water-ice two-phase mixture produced in the system. It was confirmed that the achievable bulk IPF in any tank and using any of these methods was 30-40% under stable operational conditions. For ice melting processes, two different kinds of methods were considered and tested. Both were advantageous in that almost all ice stored in a tank could be consumed, thereby maintaining high system performance. By a modeling analysis of ice melting processes in the tank, it was possible to predict accurately the time history of tank outlet water temperatures.View full abstractDownload PDF (517K) -
3st Report : Economic Analysis of System Design FactorsMasayuki TANINO, Masatake IRIBE, Tokio OKONOGI, Yoshiyuki KOZAWA1995 Volume 12 Issue 3 Pages 275-284
Published: 1995
Released on J-STAGE: September 08, 2011
JOURNAL FREE ACCESSThe economic aspects of an ice storage system employing supercooled water were compared with those of a chilled water system. In this analysis, the characteristics of the thermal storage tank and the system-COP were selected as technological factors, that have particular relevance to the economic issues at introduction of tharmal storage systems.
The following results were obtained :
(1) The cooling rate of the ice storage system was comparable with the rate of a chilled water storage system.
(2) The cooling rate of the ice storage system was not hardly influenced by the cost of thermal storage tank.
(3) In the hybrid thermal storage system, the ice storage system could surely satisfy the requirement for large peak shift.View full abstractDownload PDF (492K) -
Hidetoshi Ohkubo, Osamu Tajima1995 Volume 12 Issue 3 Pages 285-294
Published: 1995
Released on J-STAGE: September 08, 2011
JOURNAL FREE ACCESSIn the present paper, the effect of surface temperature on frost formation was experimentally investigated. To do this, surface temperature of the cooled plate was varied from -10°C to -188°C. The growth forms of ice crystals of the frost layers were observed by a light microscope. The main parameters discussed are the frost mass rate, the frost growth, and the surface temperature of the frost layer. Taking account of the effect of surface temperature of surface temperature of the cooled plate, the frosting curves and correlating equations for frost formation were proposed. The frosting curves can be divided into four regions.View full abstractDownload PDF (767K) -
—Horizontal cylinder(s) in a rectangular cavity—Kengo SASAGUCHI, Koji KUSANO1995 Volume 12 Issue 3 Pages 295-306
Published: 1995
Released on J-STAGE: September 08, 2011
JOURNAL FREE ACCESSIn the present study, a new numerical model was proposed to analyze solid/liquid phase change heat transfer change heat transfer without porous media, and usual (without phase change) transient natural convection with/without porous media. With this model, calculations were performed to examine the effect of the natural convection on the solidification of pure water (without porous media) around a single cylinder and two cylinders. The numerical results were in good agreement with experimental ones. It was also shown that for the initial water temperature, Ti, of 0°C, the solidification more efficiently progresses for the single cylinder than that for the two cylinder, but for Ti≥4°C, the reverse is true.View full abstractDownload PDF (651K) -
—2nd Report : Developments of dühring Chart and dühring Equation—Kazuhiko MURAKAMI, Haruki SATO, Koichi WATANABE1995 Volume 12 Issue 3 Pages 307-311
Published: 1995
Released on J-STAGE: September 08, 2011
JOURNAL FREE ACCESSDühring chart and Dühring equation of LiBr/H2Osolution are very important for many advanced engineering design of the absorption refrigeration/heat pump systems. The objective of the present study is to develop the Dühring chart and Dühring equation of LiBr/H2Osolution over a wide range of parameters.
The present Dühring chart and Dühring equation are developed on the basis of a bubble-point-pressure correlation previously developed. The proposed Dühring equation covers an extensive range of validity ever proposed:273-500K for solution temperatures and 0.30≤w≤0.75 for concentrations. The equation are compared with the Dühring equation by McNeely.View full abstractDownload PDF (238K) -
Takao YOSHIMURA, Takashi SHIMIZU, Tadashi YAGISAWA, Takahide NAGAO1995 Volume 12 Issue 3 Pages 313-324
Published: 1995
Released on J-STAGE: September 08, 2011
JOURNAL FREE ACCESSThis paper investigates the theoretical and experimental characteristics of a swing journal bearing at the small end of the connecting rod in reciprocating compressors for household refrigerators. Basic behavior of a swing journal bearing were measured by using a simplified bearing test apparatus and the experimental result that an oil film was hardly formed at the bearing agreed well with the theoretical result calculated using lubrication theory based on the Reynolds equation. On the other hand, the swing bearing characteristics at the small end of the connecting rod in refrigerant compressors were analyzed theoretically under various operating conditions of household refrigerators. During one revolution of the compressor, independently of the operating conditions, the eccentricity in the small end bearing was always more than 0.99 and the attitude angle of the bearing changed less than half of the swing angle of the bearing. The theoretical results of the oil film thickness changes agreed gualitatively with experimental results of the metallic contact variations measured by electrodes mounted at the bearing. All these things confirmed that the swing journal bearing at the small end of the connecting rod was under a severe lubricating condition.View full abstractDownload PDF (598K)
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Michio YANADORI, Yoshihito WATABE1995 Volume 12 Issue 3 Pages 325-330
Published: 1995
Released on J-STAGE: September 08, 2011
JOURNAL FREE ACCESSThis report presents the results of ice making and ice melting experiment in bench-scale adsorption type ice making apparatus with adsorption container filling up silica gel and multistage tray evaporator accumulating water. In ice making process, the degree in supercooling of water in tray, cooling speed and heat flux to heat exchanger in adsorbent packed bed are showed. The behaviors of temperature rise in trays in ice melting process are clarified.View full abstractDownload PDF (298K)
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