混合工质对喷射式冷电联供循环性能的影响

doi:10.3969/j.issn.2097-0706.2023.04.004

综合智慧能源 ›› 2023, Vol. 45 ›› Issue (4): 26-34.doi: 10.3969/j.issn.2097-0706.2023.04.004

混合工质对喷射式冷电联供循环性能的影响

赵东鹏(), 赵力(), 邓帅(), 赵睿恺(), 许伟聪()

天津大学中低温热能高效利用教育部重点实验室，天津 300350

收稿日期:2022-07-15 修回日期:2022-08-17 接受日期:2023-03-12 出版日期:2023-04-25 发布日期:2023-05-06
通讯作者: 赵力
作者简介:赵东鹏（1994），男，在读博士研究生，从事热力循环设计与优化等方面的研究，zdp1994@tju.edu.cn；
邓帅（1981），男，副教授，博士，从事碳捕集中工程热物理等方面的研究，sdeng@tju.edu.cn；
赵睿恺（1989），男，副研究员，博士，从事碳捕集中的程热物理等方面的研究，ruikaizhao@tju.edu.cn；
许伟聪（1992），男，博士后，博士，从事新型热力循环设计及优化等方面的研究，xuweicong@tju.edu.cn。
基金资助:
中国博士后科学基金项目(2021TQ0237);天津大学自主基金项目(2022XCG-0016);国家重点研发计划项目(2018YFB0905103)

Effects of mixed working fluids on the performance of a combined power and ejector refrigeration cycle

ZHAO Dongpeng(), ZHAO Li(), DENG Shuai(), ZHAO Ruikai(), XU Weicong()

Key Laboratory of Efficient Utilization of Low and Medium Grade Energy （Ministry of Education）， Tianjin University， Tianjin 300350， China

Received:2022-07-15 Revised:2022-08-17 Accepted:2023-03-12 Online:2023-04-25 Published:2023-05-06
Contact: ZHAO Li
Supported by:
China Postdoctoral Science Foundation(2021TQ0237);The Independent Innovation Foundation of Tianjin University(2022XCG-0016);Key R&D Program of China(2018YFB0905103)

摘要/Abstract

摘要：

通过耦合动力循环和喷射式制冷循环，喷射式冷电联供循环可以在中低温热能的驱动下同时进行制冷和发电，在可再生能源利用、余热回收等领域有重要的应用价值。不同于单一功能的动力循环，冷电联供循环需要同时保证热源和循环之间、载冷流体和循环之间形成良好的温度匹配。在动力循环中，有机闪蒸循环被认为能够很好地实现变温热源和循环之间的温度匹配。在制冷循环中，非共沸工质能够尽可能地实现循环和载冷流体之间的温度匹配。因此，在基于有机闪蒸循环的喷射式冷电联供循环中使用非共沸工质，可以同时实现热源和循环之间、载冷流体和循环之间较好的温度匹配。通过建立数学模型，研究了R600a/R601a混合工质对该冷电联供循环性能的影响。结果表明，当R600a的质量组分为0.3时，循环的?效率达到最大值37.38%，比采用R600a纯工质提高了4.20%，比采用R601a纯工质提高了6.30%。

关键词: 冷电联供循环, 有机闪蒸循环, 喷射器, 混合工质, 制冷

Abstract:

A combined power and ejector refrigeration cycle （CPERC） can simultaneously generate power and cold by coupling a power cycle with a ejector refrigeration cycle. CPERCs，driven by medium and low-temperature thermal energy，are applicable in renewable energy utilization，waste heat recovery and other fields. Different from the cycle with a single function，a CPERC needs to ensure the good temperature match between the heat source and the cycle and that between the refrigerant and the cycle simultaneously.For the power cycle，the organic flash cycle can achieve a good temperature match between the temperature-swing heat source and the cycle.For the refrigeration cycle，zeotropic working fluid can achieve a good temperature match between the cycle and the refrigerant.Therefore，the CPERC taking the organic flash cycle and zeotropic working fluid can achieve the temperature matches above simultaneously.By establishing a mathematical model， the effect of the R600a/R601a zeotropic mixture on the performance of the CPERC is studied. The results show that when the mass fraction of R600a is 0.3，the exergy efficiency of the CPERC peaks at 37.38%，which is 4.20% higher than that of the CPERC taking pure R600a and 6.30% higher than that of the CPERC taking pure R601a as its working fluid.

Key words: combined power and cooling cycle, organic flash cycle, ejector, mixed working fluid, refrigeration

中图分类号:

TK114：TK123

赵东鹏, 赵力, 邓帅, 赵睿恺, 许伟聪. 混合工质对喷射式冷电联供循环性能的影响[J]. 综合智慧能源, 2023, 45(4): 26-34.

ZHAO Dongpeng, ZHAO Li, DENG Shuai, ZHAO Ruikai, XU Weicong. Effects of mixed working fluids on the performance of a combined power and ejector refrigeration cycle[J]. Integrated Intelligent Energy, 2023, 45(4): 26-34.

图/表 9

图1

图2

表1

各部件的控制方程

部件名称	能量守恒方程及其他控制方程
工质泵	$P i n = q m, p h 2 - h 1, η p u m p = h 2, s - h 1 / h 2 - h 1$ 式中： $q m, p$ 为动力循环的工质质量流量；η_pump为工质泵的等熵效率；h_2,s为等熵条件下工质泵出口处工质的比焓
内部换热器	$Q i h e = q m, p h 3 - h 2 = q m, t u r h 6 - h 7$ 式中：Q_ihe为内部换热器的换热功率； $q m, t u r$ 为流经膨胀机的工质质量流量
加热器	$Q i n = q m, g w h g w, i n - h g w, o u t = q m, p h 4 - h 3$ 式中：Q_in为循环在加热器中的吸热功率； $q m, g w$ 为地热水的质量流量；h_gw,in为加热器入口处地热水的比焓；h_gw,out为加热器出口处地热水的比焓
闪蒸分离器	$h 4 = h 4', q m, t u r = q m, p x 4', q m, e j e = q m, p 1 - x 4'$ 式中： $q m, e j e$ 为喷射器一次流体的质量流量； $x 4'$ 为闪蒸后工质的干度
膨胀机	$P o u t = q m, t u r h 5 - h 6, η t u r = h 5 - h 6 / h 5 - h 6, s$ 式中：η_tur为膨胀机的等熵效率；h_6,s为等熵条件下膨胀机出口处工质的比焓
节流阀	$h 9 = h 1$
蒸发器	$Q c = q m, f w h f w, i n - h f w, o u t = q m, c h 10 - h 9$ 式中： $q m, f w$ 为冷冻水的质量流量；h_fw,in为蒸发器入口处冷冻水的比焓；h_fw,out为蒸发器出口处冷冻水的比焓； $q m, c$ 为制冷子循环的工质质量流量
喷射器	$μ = q m, c / q m, e j e$
混合器	$q m, c + q m, e j e h 11 + q m, t u r h 7 = q m, c + q m, p h 12$
冷凝器	$Q o u t = q m, c w h c w, o u t - h c w, i n = q m, c + q m, p h 12 - h 1$ 式中：Q_out为循环在冷凝器中的放热功率； $q m, c w$ 为冷却水的质量流量；h_cw,in为冷凝器入口处冷却水的比焓；h_cw,out为冷凝器出口处冷却水的比焓

表1

图3

图4

图5

图6

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图8

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混合工质对喷射式冷电联供循环性能的影响

Effects of mixed working fluids on the performance of a combined power and ejector refrigeration cycle

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