高温用R1336mzz(E)およびその混合作動媒体の水平溝付管内蒸発・凝縮熱伝達および圧力損失

DOI Web Site Web Site 参考文献9件

書誌事項

タイトル別名
  • Evaporation/Condensation Heat Transfer and Pressure Drop of R1336mzz (E) and Its Mixture Working Fluid for High-temperature inside Horizontal Microfin Tubes
  • シンポジウム 高温用R1336mzz(E)およびその混合作動媒体の水平溝付管内蒸発・凝縮熱伝達および圧力損失
  • シンポジウム コウオンヨウ R1336mzz(E)オヨビ ソノ コンゴウ サドウ バイタイ ノ スイヘイ ミゾツキカン ナイ ジョウハツ ・ ギョウシュク ネツ デンタツ オヨビ アツリョク ソンシツ

この論文をさがす

抄録

<p>  Research is currently in progress on developing and improving efficiency of high-temperature heat pumps and organic Rankine cycle power systems, both of which generate high-temperature steam by effectively utilizing low-quality heat sources from ship engines and factories for industrial purposes. From an environmental point of view, development efforts are also underway to replace low-pressure working fluids used in these systems with new alternative working fluids with low global warming potentials (GWPs). The purpose of this study is to experimentally clarify the evaporation and condensation flow characteristics of alternative low-GWP working fluids inside two types of horizontal microfin tubes with outer diameters of 9.5 mm. The Hydrofluoroolefin (HFO) working fluids R1336mzz(E) and R1336mzz(Z), both of which are expected to replace the working fluid R245fa that is used widely at present, two pure components and their mixture were used as test fluids in this study. In this experiment, the authors measured the evaporation and condensation heat transfer coefficients and pressure drop under the conditions of 50-300 kg/(m2s) mass velocity, a saturated evaporation temperature of 40 °C and a saturated condensation temperature of 60 °C. The results of the experiment clarified the effects of mass velocity and fin geometries on the evaporation and condensation heat transfer and pressure drop characteristics of R1336mzz(E), R1336mzz(Z) and their mixture working fluid. In addition, comparisons were made between the evaporation and condensation heat transfer coefficients and pressure drop of these working fluids and those of R245fa to highlight differences in their performance. Furthermore, the measured values were correlated with previous correlations for evaporation and condensation heat transfer for microfin tubes to verify the applicability of these predicted correlations.</p>

収録刊行物

参考文献 (9)*注記

もっと見る

関連プロジェクト

もっと見る

詳細情報 詳細情報について

問題の指摘

ページトップへ