具有 1 毫米楔形深度的板式热交换器中 R32 和 R410A 流动沸腾的热液压特性

IF 3.5 2区 工程技术 Q1 ENGINEERING, MECHANICAL International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2024-09-07 DOI:10.1016/j.ijrefrig.2024.08.017
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摘要

钎焊板式热交换器(BPHE)因其较小的楔形通道而在减少制冷剂库存和提高效率方面获得了更多优势。本文通过实验研究了 R32 和 R410A 在楔形槽深度为 1 毫米、楔形槽形状为 W 形和 V 形的钎焊板式热交换器中流动沸腾时的传热和压降。分析了两种制冷剂和两种板型的传热系数(HTC)和摩擦压降(FPD)随质量通量(R32 为 15 - 40 kg m-2 s-1,R410A 为 25 - 60 kg m-2 s-1)和外加热通量(6 - 14 kW m-2)的变化情况。在具有等效摩擦因数的 W 形板和 V 形板中,在相同质量通量下,R32 的 HTC 分别比 R410A 高约 10 % 和 30 %。与 W 形板相比,V 形板更适合 R32。现有的过渡标准无法预测微尺度通道中的流动沸腾传热机理,在目前的工况条件下,对流沸腾在 1 毫米楔形深度的通道中似乎占主导地位,尤其是对于 R32。Hsieh 和 Lin 以及 Palmer 等人的 HTC 相关性较好地拟合了测量数据,分别有 96% 和 80% 的数据偏差在 ±20% 以内。Huang 等人的相关性显示了 FPD 的可预测性,80% 以上的数据在 ±25 % 的偏差范围内。
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Thermal−hydraulic characteristics of R32 and R410A flow boiling in plate heat exchangers with 1 mm chevron depth
Brazed plate heat exchanger (BPHE) has gained more advantages of refrigerant inventory reduction and high efficiency due to smaller chevron channel. This paper experimentally investigates the heat transfer and pressure drop of R32 and R410A flow boiling in BPHEs with 1 mm chevron depth and W– and V– chevron patterns. Variations in heat transfer coefficient (HTC) and frictional pressure drop (FPD) with mass flux (15 − 40 kg m−2 s−1 for R32 and 25 − 60 kg m−2 s−1 for R410A) and imposed heat flux (from 6 − 14 kW m−2) are analyzed for each combination of the two refrigerants and two types of plate patterns. The HTC of R32 is approximately 10 % and 30 % higher than that of R410A at same mass flux in W– and V–shaped plates, respectively, which has an equivalent friction factor. The V–shaped plate is found more suited for R32 compared to the W–shaped plate. The existing available transition criterions fail to predict the flow boiling heat transfer mechanism in microscale channel, and convective boiling seems dominant in 1 mm chevron depth channel under the present working conditions, particularly for R32. The HTC correlations of Hsieh and Lin, and Palmer et al. fit the measured data relatively well with 96 and 80 % data within the deviation of ±20 %, respectively. Huang et al. correlation exhibits fare predictability for FPD, with more than 80 % data within the deviation of ±25 %.
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来源期刊
CiteScore
7.30
自引率
12.80%
发文量
363
审稿时长
3.7 months
期刊介绍: The International Journal of Refrigeration is published for the International Institute of Refrigeration (IIR) by Elsevier. It is essential reading for all those wishing to keep abreast of research and industrial news in refrigeration, air conditioning and associated fields. This is particularly important in these times of rapid introduction of alternative refrigerants and the emergence of new technology. The journal has published special issues on alternative refrigerants and novel topics in the field of boiling, condensation, heat pumps, food refrigeration, carbon dioxide, ammonia, hydrocarbons, magnetic refrigeration at room temperature, sorptive cooling, phase change materials and slurries, ejector technology, compressors, and solar cooling. As well as original research papers the International Journal of Refrigeration also includes review articles, papers presented at IIR conferences, short reports and letters describing preliminary results and experimental details, and letters to the Editor on recent areas of discussion and controversy. Other features include forthcoming events, conference reports and book reviews. Papers are published in either English or French with the IIR news section in both languages.
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