The proceedings of the JSME annual meeting
Online ISSN : 2433-1325
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2008.3
Displaying 101-105 of 105 articles from this issue
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  • 2618 Forced Convection Boiling Heat Transfer of Carbon Dioxide near Critical Pressure in a Mini-channel
    Yasuhiko TANAKA, Isao ISHIHARA, Mamoru OZAWA, Hisashi UMEKAWA, Ryosuke ...
    Article type: Article
    Session ID: 2618
    Published: August 02, 2008
    Released on J-STAGE: August 01, 2017
    DOIhttps://doi.org/10.1299/jsmemecjo.2008.3.0_193
    CONFERENCE PROCEEDINGS RESTRICTED ACCESS
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    Increasing attention has been given to carbon dioxide as an alternative substance for heat pump systems from a framework of global environment. The refrigerating cycle with carbon dioxide becomes trans-critical cycle because of low critical temperature (31.06℃), and the operating pressure becomes essentially higher compared with other refrigerants. This paper describes boiling heat transfer of carbon dioxide near critical pressure in horizontal tubes of 2.0 and 3.0mm in diameter, and observed flow patterns in 2.0mm- and 3.0mm-diameter tube are presented.
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  • 2619 Air-source heat pump for R410A with centrifugal compressor
    Noriyuki MATSUKURA, Yoshinori SHIRAKATA, Kenji UEDA, Kenichiro NISHII, ...
    Article type: Article
    Session ID: 2619
    Published: August 02, 2008
    Released on J-STAGE: August 01, 2017
    DOIhttps://doi.org/10.1299/jsmemecjo.2008.3.0_195
    CONFERENCE PROCEEDINGS RESTRICTED ACCESS
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    The air source heat pump for R410A with a centrifugal compressor enables the large heat capacity. The optimal modular arrangement minimizes the difference of the air flow rate to the heat exchanger among modules, so that realizes a stable control of heat pump system against disturbances.
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  • 2620 Measurement Method of Refrigerant Mass Fraction in Ammonia Absorption Refrigerator
    Kazuchika TAKEZAKI, Yoshiharu AMANO, Takumi HASHIZUME, Toshitaka TAKEI
    Article type: Article
    Session ID: 2620
    Published: August 02, 2008
    Released on J-STAGE: August 01, 2017
    DOIhttps://doi.org/10.1299/jsmemecjo.2008.3.0_197
    CONFERENCE PROCEEDINGS RESTRICTED ACCESS
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    This paper presents a measurement method of refrigerant mass faction in an ammonia-absorption refrigerator. The proposed method is modified from conventional sampling method In the conventional method, a certain volume of solution from the outlet of condenser is sampled under the atmospheric pressure. With the nature of the high volatility of ammonia, it is difficult to measure the solution volume with high precision. Therefore, authors modified experimental set-up with pressurized chamber in which the solution volume is measured with high precision. The experimental results showed good match with results of a prediction method developed by authors.
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  • 2621 Observations of frost and defrost phenomena on the surface with artificial structure
    Keisuke SHIOMI, Tatsuya YOSHIDA, Kenji YOSHIDA, Isao KATAOKA, Keiichi ...
    Article type: Article
    Session ID: 2621
    Published: August 02, 2008
    Released on J-STAGE: August 01, 2017
    DOIhttps://doi.org/10.1299/jsmemecjo.2008.3.0_199
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    In the present study, we employed the recent micron-order machining technology on the heating surface and produced the artificial micro-ordered groove pattern. The frost and defrost phenomena on the artificial surface with micro-structure are experimentally investigated. The effects of the groove depth or pattern pitch between grooves on the frost phenomena were focused. The direct observations of the frost and defrost phenomena on the surface were carried out by using the digital microscope with high spatial resolution. It is cleared that the grooves on the surface strongly affect the frost and defrost phenomena, especially the generation of the super-cooled droplets on the surface, which can be observed at the beginning of cooling. The water drainage after frost melting was also strongly affected by the micro grooves. The water smoothly flows out along the micro grooves due to the surface tension force acting on the contact between the droplets and micro grooves.
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  • [title in Japanese]
    Article type: Appendix
    Pages App3-
    Published: August 02, 2008
    Released on J-STAGE: August 01, 2017
    DOIhttps://doi.org/10.1299/jsmemecjo.2008.3.0_App3
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