日本語フィールド
著者：堀井克則，仮屋圭史，宮崎祐輔，森英夫 読み: ホリイカツノリ，カリヤケイシ，ミヤザキユウスケ，モリヒデオ題名：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1報)単列モデルによる冷媒の基本流動特性の評価発表情報：日本冷凍空調学会論文集 巻: 30 号: 4 ページ: 365-375キーワード：Refrigerator, Defrost,Evaporator, Flow pattern, Heating experiment, Visualization概要：本研究では，家庭用冷蔵庫の省電力化に向けた除霜性能向上のため，除霜運転時における蒸発器管内冷媒の流動による熱輸送現象に着目した．本報では，この現象解明の第一段階として，蒸発器を単純化した多段単列管モデルを用い，無着霜状態での加熱実験により冷媒の基本流動特性の検討を行った．加熱中，下段冷媒液の蒸発により発生した冷媒蒸気が管内を上昇する際に，冷媒液も押し上げられるが，一部は逆流する繰り返しで，下段に冷媒液が最後まで残り，加熱とともに上段への液供給量が減少して，最上段より順に過熱蒸気になることがわかった．また，測定した冷媒圧力，冷媒温度および管表面温度の変化と冷媒流動の変化の特性の関係を議論した．抄録：本研究では，家庭用冷蔵庫の省電力化に向けた除霜性能向上のため，除霜運転時における蒸発器管内冷媒の流動による熱輸送現象に着目した．本報では，この現象解明の第一段階として，蒸発器を単純化した多段単列管モデルを用い，無着霜状態での加熱実験により冷媒の基本流動特性の検討を行った．加熱中，下段冷媒液の蒸発により発生した冷媒蒸気が管内を上昇する際に，冷媒液も押し上げられるが，一部は逆流する繰り返しで，下段に冷媒液が最後まで残り，加熱とともに上段への液供給量が減少して，最上段より順に過熱蒸気になることがわかった．また，測定した冷媒圧力，冷媒温度および管表面温度の変化と冷媒流動の変化の特性の関係を議論した．英語フィールド
Author：Katsunori HORII, Keishi KARIYA, Yusuke MIYAZAKI, Yuki NAKASHIMA, Hideo MORITitle：Study on Performance Improvement of Defrosting for Refrigerator Considering Characteristics of Refrigerant Flow and Heat Transfer inside Evaporator Tube(1st Report)Evaluation of Refrigerant Flow Characteristics using Single-Row ModelAnnouncement information:Transactions of the Japan Society of Refrigerating and Air Conditioning Engineers Vol: 30 Issue: 4 Page: 365-375Keyword：Refrigerator, Defrost,Evaporator, Flow pattern, Heating experiment, VisualizationAn abstract：In a household refrigerator, defrosting of a frosted evaporator is effective to improve performance of the refrigerator. Many studies on defrosting have been made for air-side heat transfer. On the other hand, there are few researches on heat transfer inside the evaporator tube, that is, effect of heat transport with refrigerant flow on defrosting. In the present study, evaluation of refrigerant vapor-liquid two-phase flow inside the single-row test sections of aluminum tube, visualization tube and aluminum fin-tube model simulating the refrigerator evaporator was carried out under heating condition. During heating, refrigerant liquid in the bottom part was pushed up to upper part of the test section by vapor generated in the lower part. But some liquid returned, so liquid continued remaining in the bottom part. As time passed dryout came out from top to bottom of the test section in sequence. Such refrigerant flow characteristics were discussed with measured changes of refrigerant pressure and temperature and tube wall temperature.An abstract：In a household refrigerator, defrosting of a frosted evaporator is effective to improve performance of the refrigerator. Many studies on defrosting have been made for air-side heat transfer. On the other hand, there are few researches on heat transfer inside the evaporator tube, that is, effect of heat transport with refrigerant flow on defrosting. In the present study, evaluation of refrigerant vapor-liquid two-phase flow inside the single-row test sections of aluminum tube, visualization tube and aluminum fin-tube model simulating the refrigerator evaporator was carried out under heating condition. During heating, refrigerant liquid in the bottom part was pushed up to upper part of the test section by vapor generated in the lower part. But some liquid returned, so liquid continued remaining in the bottom part. As time passed dryout came out from top to bottom of the test section in sequence. Such refrigerant flow characteristics were discussed with measured changes of refrigerant pressure and temperature and tube wall temperature.