Study on Performance Improvement of Defrosting for Refrigerator Considering Characteristics of Refrigerant Flow and Heat Transfer inside Evaporator Tube

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  • 蒸発器管内冷媒の流動特性と熱輸送を考慮した 冷蔵庫除霜運転の効率向上に関する研究
  • 蒸発器管内冷媒の流動特性と熱輸送を考慮した冷蔵庫除霜運転の効率向上に関する研究(第3報)単列千鳥配列管および各種二列モデルによる冷媒流動特性評価
  • ジョウハツキカン ナイレイバイ ノ リュウドウ トクセイ ト ネツ ユソウ オ コウリョ シタ レイゾウコ ジョソウ ウンテン ノ コウリツ コウジョウ ニ カンスル ケンキュウ(ダイ3ポウ)タンレツ チドリ ハイレツカン オヨビ カクシュ ニレツ モデル ニ ヨル レイバイリュウドウ トクセイ ヒョウカ
  • －第3 報：単列千鳥配列管および各種二列モデルによる 冷媒流動特性評価－
  • －3rd Report: Evaluation of Refrigerant Flow Characteristics using a Single-Row Staggered Arrangement Model, and Various Two-Row Models －

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This study focuses on characteristics of refrigerant flow and heat transfer inside the evaporator tube to improve performance of defrosting for refrigerator. In the first report, evaluation of refrigerant vapor-liquid two-phase flow using the test sections of single-row model simulating the refrigerator evaporator was examined under heating condition, and basic flow characteristics were clarified. In this report, evaluation of refrigerant flow under heating condition was carried out using test sections of a single-row staggered arrangement, and various two-row models. It was found, in the staggered arrangement model, that refrigerant flow had the same characteristics as those in the simple single-row model reported in the first report, but the process time of the change became short. It was furthermore found, for the two-row models, that refrigerant flow pattern was generally different in the rows connected and not connected to an accumulator, but, in the two-row fin-tube model, the change of tube wall temperature in both rows was not different from or similar to each other due to heat conduction through the fin, regardless of the different refrigerant flow pattern.

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