Thermodynamic analysis of a combined heating and power system coupled with carbon dioxide energy storage utilizing environmental recooling

doi:10.19799/j.cnki.2095-4239.2021.0522

Abstract

Abstract:

To improve photovoltaic power output and flexibility, the construction of optical storage cooperative systems has become the mainstream trend for enhancing photovoltaic schedulability and reducing photovoltaic power curtailment. Based on the characteristics of the operating environment of the photovoltaic farm, a combined heat and power system is proposed coupled with carbon dioxide energy storage utilizing nighttime environmental cooling. Furthermore, the effect of key thermodynamic parameters on system performance under different operating modes is mainly studied. The results demonstrate that the increase of minimum temperature difference of the cool storage unit, ambient temperature at night, and the low-pressure tank pressure harms the system performance. In contrast, the increase of high-pressure tank pressure and expander inlet temperature positively affects the mode of the solar heat collection system, which works independently. In the combined working mode of the solar collector and heat pump systems, the electric energy storage, exergy, and round trip efficiencies under the design condition can reach 71.4%, 57.4%, and 87.1%, respectively, and energy storage density is 17.18 kW·h/m³. The solar factor is reduced by 35.6% compared to when the solar heat collection system is working alone. Moreover, the cool storage unit, first reheater, and heat exchanger 1 have a significant exergy loss and are the critical components for system optimization. Variations in the heat pump evaporation temperature and condenser hot water outlet temperature have a greater impact on the electrical efficiency in the mode where the heat pump system participates but has little effect on the exergy efficiency.

Key words: combined heating and power, liquid carbon dioxide energy storage, heat pump, solar factor

CLC Number:

TK 02

Feiyue TAO, Huanran WANG, Ruixiong LI, Jing ZHAO, Gangqiang GE, Xin HE, Hao CHEN. Thermodynamic analysis of a combined heating and power system coupled with carbon dioxide energy storage utilizing environmental recooling[J]. Energy Storage Science and Technology, 2022, 11(5): 1492-1501.

Figures/Tables 12

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References 17

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参数	数值
压缩机等熵效率/%	85
热泵压缩机等熵效率/%	85
膨胀机等熵效率/%	88
水的比热容/[(kJ/(kg·K)]	4.2
低压罐压力/MPa	1.5
释能压力/MPa	14
间冷器最小温差/℃	5
蓄冷回热器最小温差/℃	6
再热器最小温差/℃	6
膨胀机进气温度/℃	150
冷却水进口温度/℃	25
热泵蒸发温度/℃	30
热泵冷凝温度/℃	100
蒸发器过热温度/℃	7
冷凝器热水出口温度/℃	95
热泵冷凝器最小温差/℃	5
冷却器出口温度/℃	0

项目	部件	数值/×10³ MJ	部件㶲损占系统㶲损的比例/%
㶲损失	一级膨胀机	490.69	3.96
	二级膨胀机	550.75	4.44
	三级膨胀机	577.97	4.66
	一级间冷器	60.98	0.49
	二级间冷器	459.06	3.71
	三级间冷器	421.58	3.40
	一级再热器	1192.57	9.63
	二级再热器	133.18	1.08
	三级再热器	96.03	0.78
	一级压缩机	770.78	6.22
	二级压缩机	729.55	5.89
	三级压缩机	533.32	4.31
	换热器1	377.69	3.05
	换热器2	1148.99	9.28
	冷却器	222.40	1.80
	节流阀	94.47	0.76
	蓄冷回热器	1739.07	14.04
	间冷器回水混合	142.12	1.14
	再热器回水混合	720.50	5.82
	散热器1	30.60	0.25
	散热器2	11.41	0.09
	热泵蒸发器	374.82	3.03
	热泵冷凝器	694.43	5.61
	热泵节流阀	342.38	2.76
	热泵压缩机	468.85	3.79

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