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題 名 | 變動熱負載對雙冷板系統冷媒分佈的影響=Influence of Variable Heat Load on the Refrigerant Distribution of a Dual Cold-Plate System |
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作 者 | 尤坤煌; 楊愷祥; 王啟川; | 書刊名 | 冷凍空調&能源科技 |
卷 期 | 53 2008.10[民97.10] |
頁 次 | 頁60-67 |
分類號 | 446.641 |
關鍵詞 | 變動熱負載; 冷媒流譜; 冷板; 電子散熱; Variable heating load; Refrigerant distribution; Cold plate; Electronic cooling; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究在探討雙冷板在變動熱負載下的冷媒分佈,本系統之工作流體採用R-134a,壓縮機工作額定能力則約在50~250W,且雙冷板各部設定均相同。在實驗初始狀態,施加相同熱負載(70W)於冷板上使之兩出口狀態均爲過熱氣體,並且具有相同流量分佈。在施加不同熱負載時,可以清楚觀察到所施加的熱負載及冷媒在冷板於出口狀態對冷媒質流量分佈的影響。若冷板其中之一的出口狀態爲過熱而另一冷板則爲飽和狀態的狀況下,流經固定熱負載下的冷板流量會小於較低熱負載的冷板,其差異量的增加是隨在施加熱負載於較低的一端所造成的加速度壓降不同所致,在施加熱負載比爲0.571 (40W/70W)達最大差異量17%。若兩冷板的出口均爲過熱狀態下,固定熱負載一端的流量會略多於施加瓦數較高的一端,且其差異量會隨熱負載不同而緩慢增加,在此一狀況下,則加速度壓降可以忽略不計,其原因在於單相/兩相流在熱負載下單相區與兩相區所佔的比重不同所致。 |
英文摘要 | This study examines the refrigerant distribution of a dual cold plate system subject to the influence of heating load using a R-134a based vapor compression system with a nominal capacity ranging from 50~250 W. The cold plate is of identical configuration. Initially, test is performed under an equal heating load for each cold plate (70 W) which then gives rise to a uniform distribution and equal outlet superheat condition. For an unequal heating load, it is found that the distribution of mass flowrate subject to the influence of heating load is strongly related to the outlet states of the two cold plates. For the condition where one of the cold plate is in superheated state while the other is in saturated state, the mass flowrate for the fixed heating load is lower than that of smaller heating load, and the difference increases when the heating load gets smaller due to the influence of accelerational pressure drop. A maximum of 17% difference is seen at a loading ratio of 0.571 (40W/70W). For the condition where both outlet states of cold plate are at superheated states, the mass flowrate for the fixed heating load is marginally higher than that of the smaller heating load, and the difference is insensitive to the rise of heating load. For this situation, the effect of accelerational pressure is negligible, and it is mainly attributed to two-phase/single-phase distribution pertaining to the effect of heating load. |
本系統中英文摘要資訊取自各篇刊載內容。