開放式冷凍冷藏展示櫃節能分析之研究

A Study on the Energy Saving of Refrigeration Open Showcases

林彥良(Yen-Liang Lin)

指導教授 ： 蔡尤溪

國立臺北科技大學/機電學院/冷凍空調工程系所/碩士(2006年)

https://doi.org/10.6841/NTUT.2006.00096

摘要

由於開放式冷凍冷藏展示櫃耗能原因為冷風外洩，亦使靠近開放式展示櫃之區域溫度過冷，造成冷腳效應使消費者感到不適。本文將以雙氣簾開放式展示櫃之實驗設備，進行原機測試，並配合計算流體力學(CFD)方法模擬開放式展示櫃之氣流分佈，且與實驗值做比對。最後則利用CFD模擬軟體工具針對開放式展示櫃之設計參數進行探討分析展示櫃內有無物品之差異性，並以考慮實際上展示櫃內有物品為基礎，探討改變內外氣簾噴流角度與具有創意之加裝側邊噴流裝置，以及回風口前緣設置擋板對展示櫃冷風洩漏量之影響。由模擬結果可發現，展示櫃內無放置物品Case0與櫃內放滿物品Case1之冷風洩漏量比較，展示櫃內放滿物品Case1之冷風洩漏量則可減少3.63%。在改變內外氣簾出風之噴流角度方面，Case2-10噴流角度向內10˚與櫃內放滿物品Case1之洩漏量比較，Case2-10之冷風洩漏量可減少11.2%。另外，在側邊噴流裝置方面，Case3-0.02在側邊噴流風速在0.02m/s時與Case1之冷風洩漏量比較，Case3-0.02之冷風洩漏量可減少14.8%。最後由研究結果可得知，改變內外氣簾之出風噴流角度與加裝側邊噴流裝置將有助於改善開放式展示櫃之冷風外洩，並且為可行性之設計。

關鍵字

開放式冷凍冷藏展示櫃 ； 雙氣簾 ； 計算流體力學 ； 節約能源 ； 氣簾噴流角度 ； 側邊噴流裝置

並列摘要

The major cause of energy consumption for refrigeration open showcases is cold air leakage. This leakage also causes uncomfortable low temperature adjacent to a showcase. This study used a double air curtain refrigeration open showcase for experimental performance study. The air flow distribution was determined using a computational fluid dynamics (CFD) method, and used to verify the computation results.
Then the variation with and without goods in the open showcases was also analyzed using CFD. Further with actual goods in the open showcase, it was explored using CFD on the influence of the interior/exterior air curtain jet angle, addition of side jet device, and a baffle in front of the air return vent.
The simulation results showed that no goods in the open showcase, when compared to when the open showcase was filled with goods, 3.63% less leakage can be achieved, compared to the case where the open showcases was full.
With respect to changes of the angle of the interior/exterior air curtains, the difference of leakage can be about 11.2% less. Additionally, with respect to the side jet device, when comparing the amount of cold air leakage for the velocity of side jet is 0.02m/s to Case1, the amount of cold air leakage for Case3-0.02 was reduced by 14.8%. Finally we conclude that from the results of the study, the changing of jet angle of the interior/exterior air curtains and the addition of side jet device help improve the cold air leakage of the open showcases. It is therefore a workable design

並列關鍵字

Refrigeration open showcases ； double air curtain ； computational fluid dynamics ； energy saving ； air curtain jet angle ； side jet device

參考文獻

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