The characteristics of flow boiling heat transfer of R410a heated unequally between two parallel mini-channels

Shohei Sakai, Kizuku Kurose, Wataru Noboritate, Kazushi Miyata, Yoshinori Hamamoto

研究成果: Contribution to conferencePaper査読

抄録

A novel high performance refrigerant-air heat exchanger employing multiport extruded tubes which have parallel refrigerant mini-channels has recently been developed for heat pump systems. In evaporators, since the flow direction of refrigerant in the multiport tubes is perpendicular to that of outside heat source air, the heat transfer rate to the refrigerant channels on upstream side of air flow are larger than those on downstream. Such an inequality in heat loads of refrigerant channels causes also inequalities in flow rates and heat transfer coefficients of the refrigerant. This phenomenon not only makes it difficult to predict heat exchange performance accurately but also often induces the deterioration of refrigerant heat transfer. In this study, experiments on flow boiling heat transfer of a refrigerant R410A flowing in two parallel mini-channels heated unequally were conducted. As the inequality in heat loads of the channels increased, the heat transfer rate of higher-heated channel does not change much from that in the equally heated condition, while that of lower-heated channels decreased remarkably. As a result, the averaged heat transfer rate of the two channels reduced with expanding the difference in the heat loads. In addition, the deterioration of averaged heat transfer rate of the two channels was noticeable at a higher mass velocity.

本文言語英語
ページ783-786
ページ数4
出版ステータス出版済み - 2020
イベント7th International Conference on Power Engineering, ICOPE 2019 - Kunming, 中国
継続期間: 10 21 201910 25 2019

会議

会議7th International Conference on Power Engineering, ICOPE 2019
Country中国
CityKunming
Period10/21/1910/25/19

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering
  • Fuel Technology
  • Energy Engineering and Power Technology

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