• Title/Summary/Keyword: melting study

Search Result 1,658, Processing Time 0.038 seconds

A Study on the Heat Storage Characteristics of a Latent Heat Storage Tank with Shell and Tube Type (셀-튜브형 잠열축열조의 축열특성에 관한 연구)

  • 권영만;김경우;모정하
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
    • /
    • v.12 no.8
    • /
    • pp.745-754
    • /
    • 2000

  • An experimental study has been carried out in order to investigate the heat storage characteristics for a latent heat storage tank with horizontal shell and tube type. The heat storage tank consists of cylindrical capsules with a staggered tube bank. The effects of flow rates and initial temperature differences on the melting time and heat storage rates are examined. It is found that the melting time decreases with increase of the flow rates and initial temperature differences. Results also show that the time-averaged overall heat transfer coefficients increase in proportion to the increase of flow rates and initial temperature differences.

  • PDF

Synthesis of Hole Transport Materials for Organic Light Emitting Device (유기발광디바이스용 정공수송재료의 합성)

  • Chung, Pyung-Jin;Cho, Min-Ju
    • Korean Journal of Materials Research
    • /
    • v.15 no.7
    • /
    • pp.448-452
    • /
    • 2005

  • This study was based on organic electroluminescence display. Especially, TPD and $\alpha-NPD$ for the hole transport materials were synthesized by Ullmann reaction. This reaction was conducted between 3­methylphenylamine, 1-naphthylamine and 4,4'-diiodobiphenyl in toluene containing CuCl catalyst and KOH base. The structural property of reaction products were analyzed by FT-IR, $^1H-NMR$ spectroscopy, and thermal stability, reactivity and PL property were analyzed by melting point, yield and emission spectrum, respectively. The photoluminescence spectra of a pure TPD and $\alpha-NPD$ were observed at approximately 416nm and 438nm respectively. In this study, it was known that the melting point, yield, PL properties of TPD and $\alpha-NPD$ were changed by substituent group of amines.

  • https://doi.org/10.3740/MRSK.2005.15.7.448 인용 PDF KSCI