直接接觸冰晶式儲冰系統熱質傳研究

A Study on Heat Mass Transfer for an Ice Storage System Using Direct Contact Ice Crystals Formation

游凱欣 ； 蔡尤溪 ； 林金童

《冷凍空調與能源科技雜誌》 76期 (2012/08) Pp. 56-62

https://doi.org/10.7087/JEHVACE.201208.0056

摘要

本研究探討一種新的製冰方法，噴水滴於低溫空氣中透過液滴與空氣直接接觸做熱交換，以熱質傳使液滴於冷空氣中快速形成冰晶，可將冰晶儲存作為儲冰空調。本研究內容主要進行熱質傳實驗研究，以乾冰置於一條長型風道冷風吹過乾冰送往儲冰桶形成低溫空氣，在儲冰桶內噴水滴與冷空氣形成直接接觸熱交換。本研究藉由噴水粒徑取樣了解粒徑之分佈，了解結晶變化狀況。實驗結果發現結晶的熱質傳效果佳，計算結果為熱傳對流係數值可高達298W/m^2°C，質傳對流係數為0.2967kg/m^2s。本研究獲得的熱質傳實驗結果，可運用到儲冰及食品冷凍系統設計。

關鍵字

儲冰 ； 熱質傳 ； 噴霧結晶

並列摘要

In this research a new idea of ice making was studied. Water droplets injected into cold air would undergo direct contact heat and mass transfer so that ice crystals would form quickly in the cold air. The ice crystals can be stored and used in air-conditioning. Heat and mass transfer experiments were performed in this study. Cold air was generated by blowing air over dry ice. The cold air would get contact with the water droplets in the ice storage tank and direct contact heat mass transfer would occur in the tank. The distribution of the droplet size was obtained for understanding of the crystallization and heat mass transfer calculation. The heat and mass transfer was found to be effective. It was found that the heat transfer coefficient can be as high as 298W/m^2°C. The mass transfer obtained was O.2967kg/m^2s.

並列關鍵字

Ice storage ； heat mass transfer ； spray crystallization