固定换热面积的回热器优化设计研究

高娇; 王少华; 黄洪文

doi:10.11884/HPLPB202234.210521

固定换热面积的回热器优化设计研究

doi: 10.11884/HPLPB202234.210521

中国工程物理研究院核物理与化学研究所，四川绵阳 621999

基金项目: 中国工程物理研究院创新发展基金培育项目（PY20210013）

详细信息

作者简介:
高　娇，J.Gao@caep.cn

中图分类号: TL33
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- 被引次数: 0
出版历程
- 收稿日期: 2021-11-25
- 修回日期: 2022-04-02
- 网络出版日期: 2022-04-09
- 刊出日期: 2022-05-15

Investigation into optimum design of recuperator at a confirmed heat transfer area

Institute of Nuclear Physics and Chemistry, CAEP, Mianyang 621999, China

摘要

摘要: 为探究印刷电路板换热器（PCHE）Z型通道中超临界CO₂的换热特性，在换热面积固定的前提下指导回热器优化设计，采用数值模拟方法对CO₂-CO₂耦合换热的局部和整体特性进行了分析，通过CFD计算得到典型PCHE结构和典型工况下回热器的换热特性，与实验结果进行对比，验证计算模型。并利用此模型计算具有相同换热面积、不同通道结构的回热器的局部和整体换热性能，厘清结构参数对换热性能的影响规律。研究表明，计算结果与实验结果吻合，当通道夹角从110°增加至115°时换热系数出现最大幅度的下降，根据不同的设计需求，最佳的夹角范围为110°～120°。
- 超临界CO₂ /
- 换热特性 /
- 印刷电路板换热器(PCHE) /
- 回热器 /
- 换热面积
Abstract: This study aims to investigate the heat transfer characteristics of supercritical CO₂ when flowing through the printed circuit heat exchanger with Z type channel, and further guide the optimum design of recuperator at confirmed heat transfer area. Numerical simulation is used to analyze the local and overall heat transfer characteristics between CO₂ at two pressures. The heat transfer characteristics of a recuperator with typical structure are calculated at a typical working condition, and compared to the experimental results to check the computation model. Then, the heat transfer characteristics of the recuperator with the same heat transfer area but different channel structure are calculated. The effect law of the structure on heat transfer is explored. The study shows that the calculation results have good agreement with the experimental results. The heat transfer coefficient decreases the most when the channel included angle increases from 110° to 115°and the advised range is 110°−120° for different design requirements.
- super critical CO₂ /
- heat transfer characteristics /
- printed circuit heat exchanger /
- recuperator /
- heat transfer area

HTML全文

图 1 回热器单元结构

Figure 1. Geometry model of the recuperator unit

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图 2 回热器单元网格划分

Figure 2. Mesh of the recuperator unit

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图 3 网格无关性验证

Figure 3. Mesh independence test

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图 4 回热器中CO₂温度变化趋势

Figure 4. Temperaturevariation trend of CO₂ in recuperator

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图 5 换热系数对比

Figure 5. Comparison of heat transfer coefficient

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图 6 换热效率对比

Figure 6. Comparison of heat transfer efficiency

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图 7 回热器中CO₂压力变化趋势

Figure 7. Temperature variation trend of CO₂ in recuperator

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图 8 压降对比

Figure 8. Comparison of pressure drop

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表 1 回热器测试件结构参数

Table 1. Geometry information of the test recuperator

	channel diameter/mm	channel included angle/(°)	pitch size/mm	plate No.	channel No. at each plate	pitch No.
hot side	1.5	115	9	30	27	60
cold side	1.5	115	9	31	27

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表 2 换热性能计算结果与实验结果对比

Table 2. Comparison of the heat transfer performance between simulation and tests

condition		T_h,i/K	T_h,o/K	p_h/MPa	T_c,i/K	T_c,o/K	p_c/MPa	η/%
case1	test	699.45	369.15	8.4	357.75	610.85	19.3	95.2
	parallel	699.45	362.78	8.4	357.75	617.48	19.3	97.2
	stagered	699.45	362.75	8.4	357.75	617.68	19.3	97.3
case2	test	705.15	363.25	7.6	355.45	601.85	20.6	94.2
case2	simulation	705.15	360.43	7.6	355.45	619.95	20.6	98.2

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参考文献(17)

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