ANALYSIS ON APPROACHES FOR INCREASING HEAT SUPPLYING TEMPERATURE OF CO2 TRANSCRITICAL HEAT PUMP

Shi Weixiu; Ji Xueyuan; Pan Lisheng; Lyu Yifan; Wei Xiaolin

doi:10.19912/j.0254-0096.tynxb.2021-1349

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Acta Energiae Solaris Sinica ›› 2022, Vol. 43 ›› Issue (4) : 104-111. DOI: 10.19912/j.0254-0096.tynxb.2021-1349

Topics on Key Technologies for Safety of Electrochemical Energy Storage Systems and Echelon Utilization of Decommissioned Power Batteries

ANALYSIS ON APPROACHES FOR INCREASING HEAT SUPPLYING TEMPERATURE OF CO₂ TRANSCRITICAL HEAT PUMP

Shi Weixiu¹, Ji Xueyuan¹, Pan Lisheng², Lyu Yifan¹, Wei Xiaolin²

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Abstract

The transcritical heat pump with CO₂, an environmentally friendly natural working fluid, shows great potential in high temperature heating. A CO₂ transcritical pressurization analysis model and a CO₂ transcritical heat pump analysis model have been established. Based on them, the effects of different pressurization processes on COP, outlet temperature and mass flow rate of water in gas cooler are studied. The results show that both approaches can improve the isentropic efficiency, power and outlet working fluid temperature of the compressor, and increase the outlet water temperature of the gas cooler, but decrease the COP and hot water mass flow. In general, when increasing the outlet water temperature of gas cooler, the approach of increasing the suction superheat makes power increases slightly, but the COP decreases greatly, which can increase hot water temperature in a small range. By increasing the compressor outlet pressure, the hot water temperature is higher, the controllable range is larger, and COP has a smaller decline.

Key words

carbon dioxide / heat pump system / high temperature application / centrifugal compressor

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Shi Weixiu, Ji Xueyuan, Pan Lisheng, Lyu Yifan, Wei Xiaolin. ANALYSIS ON APPROACHES FOR INCREASING HEAT SUPPLYING TEMPERATURE OF CO₂ TRANSCRITICAL HEAT PUMP[J]. Acta Energiae Solaris Sinica. 2022, 43(4): 104-111 https://doi.org/10.19912/j.0254-0096.tynxb.2021-1349

References

[1] 潘利生, 魏小林, 史维秀.一种新型CO₂跨临界动力循环理论研究[J]. 工程热物理学报, 2015, 36(6): 1182-1185.
PAN L S, WEI X L, SHI W X.Theoretical investigation on a novel CO₂ transcritical power cycle[J]. Journal of engineering thermophysics, 2015, 36(6): 1182-1185.
[2] 宋昱龙, 王海丹, 殷翔,等. 跨临界CO₂蒸气压缩式制冷与热泵技术综述[J]. 制冷学报, 2021, 42(2): 1-24.
SONG Y L, WANG H D, YIN X, et al. Review of transcritical CO₂ vapor compression technology in refrigeration and heat pump[J]. Journal of refrigeration, 2021, 42(2): 1-24.
[3] 杨军, 陆平, 陈江平, 等. 跨临界CO₂系统用膨胀机的开发与模型分析[J]. 上海交通大学学报, 2008, 42(3): 453-456.
YANG J, LU P, CHEN J P, et al. Development and model analysis of an expander for transcritical CO₂ system[J]. Journal of Shanghai Jiaotong University, 2008(3): 453-456.
[4] ZHANG B, PENG X, HE Z, et al. Development of a double acting free piston expander for power recovery in transcritical CO₂ cycle[J]. Applied thermal engineering, 2007, 27(8-9): 1629-1636.
[5] RONY U, GLADEN A.Parametric study and sensitivity analysis of a PV/microchannel direct-expansion CO₂ heat pump[J]. Solar energy, 2021, 218: 282-295.
[6] ZHU Y H, HUANG Y L, LI C H, et al. Experimental investigation on the performance of transcritical CO₂ ejector-expansion heat pump water heater system[J]. Energy conversion and management, 2018, 167: 147-155.
[7] 邹春妹, 岑继文, 刘培, 等. 跨临界二氧化碳热泵喷射循环实验[J]. 化工学报, 2016, 67(4): 1520-1526.
ZOU C M, CEN J W, LIU P, et al. Transcritical CO₂ heat pumpsystem with and enjector[J]. CIESC journal, 2016, 67(4): 1520-1526.
[8] ZHU Y H, JIANG P X.Theoretical model of transcritical CO₂ ejector with non-equilibrium phase change correlation[J]. International journal of refrigeration, 2018, 86: 218-227.
[9] 陈琪, 佟杨, 李矛, 等. 两种跨临界CO₂热泵热水器系统循环性能实验研究[J]. 太阳能学报, 2013, 34(11): 1903-1909.
CHEN Q, TONG Y, LI M, et al. Experimental study on cycle performance of two transcritical CO₂ heat pump water heater systems[J]. Acta solar energy sinica, 2013, 34(11): 1903-1909.
[10] RONY U, GLADEN A.Numerical modeling of a photovoltaic/microchannel direct-expansion evaporator for a CO₂ heat pump[J]. Thermal science and engineering applications, 2021, 13(2): 021022.
[11] 余文芳, 李敏霞, 王飞波, 等. CO₂系统微通道蒸发器的研究[J]. 工程热物理学报, 2015, 36(9): 1858-1862.
YU W F, LI M X, WANG F B, et al. Research on the micro-channels evaporator for carbon system[J]. Journal of engineering thermophysics, 2015, 36(9): 1858-1862.
[12] KASHIF N, BO S, AHMED E, et al. Performance optimization of CO₂ heat pump water heater[J]. International journal of refrigeration, 2018, 85: 213-228.
[13] 袁秋霞, 马一太, 张子坤, 等. CO₂水源热泵热水机气体冷却器的实验研究[J]. 太阳能学报, 2012, 33(10): 1797-1802.
YUAN Q X, MA Y T, ZHANG Z K, et al. Experimental study on gas cooler of CO₂ water source heat pump water heater[J]. Acta energiae solaris sinica, 2012, 33(10): 1797-1802.
[14] CAO F, YE Z L, WANG Y K.Experimental investigation on the influence of internal heat exchanger in a transcritical CO₂ heat pump water heater[J]. Applied thermal engineering, 2020, 168: 114855.
[15] LEMMONN E W, HUBER M L, MCLINDEN M O.Nist standard reference database 23, reference fluid thermodynamic and transport properties (REFPROP).version 9.0[CP/DK]. National institute of standards and technology, 2010.