Energy and exergy analysis of a solution cross-type absorption-resorption heat pump using NH3/H2O as working fluid

doi:10.11949/0438-1157.20221586

Abstract

Abstract:

Ammonia water absorption-reabsorption heat pump (ARHP) is a special kind of absorption heat pump (AHP), which can reduce the working pressure and the temperature of the driving heat source. However, the COP of traditional ARHP is lower than the AHP. This paper proposed a cross-type ARHP, which optimized the pipelines to improve the COP. The thermodynamic model of the ARHP was established by MATLAB software, and energy and exergy analyses were carried out. The results show that the COP of the system can reach 1.564, which is 8.1% higher than that of the traditional system. The exergy loss of the system mainly comes from the generator and the resorber. The influence of generation temperature, absorption temperature and exergy temperature on exergy efficiency was further analyzed. The exergy efficiency of the ARHP increased by up to 6.9% compared with that of the AHP. The proposed system provides an essential reference for the advancement of absorption-reabsorption technology.

Key words: absorption, resorption, kinetic modeling, exergy, solution cross-type

摘要：

氨水吸收-再吸收式热泵（ARHP）是一种特殊的吸收式热泵（AHP），可以在维持供热温度的同时降低工作压力和驱动热源温度，但性能系数较低。提出了一种氨水溶液交叉型吸收-再吸收式热泵，通过合理分配不同浓度的溶液提高系统的性能系数。借助MATLAB建立系统热力学模型并进行能量分析和分析，结果表明，该系统的COP可达1.564，比传统系统高8.1%，且系统损失主要来源于发生器和再吸收器。进一步分析了发生温度、吸收温度、解析温度对系统效率的影响，发现新系统比旧系统的效率提升最多可达6.9%。该系统的提出为吸收-再吸收系统的优化提供重要参考。

关键词: 吸收, 再吸收, 动力学模型, 溶液交叉型

CLC Number:

TU 83

Zhenghao JIN, Lijie FENG, Shuhong LI. Energy and exergy analysis of a solution cross-type absorption-resorption heat pump using NH₃/H₂O as working fluid[J]. CIESC Journal, 2023, 74(S1): 53-63.

金正浩, 封立杰, 李舒宏. 氨水溶液交叉型再吸收式热泵的能量及分析[J]. 化工学报, 2023, 74(S1): 53-63.

Figures/Tables 18

Fig.1 The comparison between the AHP cycle and the ARHP cycle

Fig.2 The ammonia-water solution cross-type absorption-resorption heat pump system

Fig.3 The enthalpy concentration diagram of ammonia-water solution cross-type ARHP

Table 1 Working condition of the system

工作条件	取值
发生器热端温差ΔT_gen	5℃
吸收器/再吸收器传热温差ΔT_abs、ΔT_res	4℃
解析器传热温差ΔT_des	5℃
溶液热交换器的冷端温差ΔT_SHX	10℃
溶液热交换器的效率η	85%

Fig.4 Thermodynamic calculation flow chart of the ARHP system

Fig.5 The COP varied with the PH and PL

Fig.6 The optimal low-pressure values of the traditional type ARHP and solution cross-type ARHP

Table 2 Comparison of exergy loss

设备名称	损I/kW		损系数Ω/%
设备名称	传统系统	溶液交叉型系统	传统系统	溶液交叉型系统
发生器	168.77	155.73	16.45	15.50
精馏器	40.72	0	3.97	0
吸收器	70.40	62.03	6.86	6.18
再吸收器	97.47	120.51	9.50	12.00
解析器	59.80	60.66	5.83	6.04
减压阀1	8.41	9.02	0.82	0.90
减压阀2	2.24	2.00	0.22	0.20
溶液泵	0	0	0	0
换热器1	50.32	45.64	4.91	4.54
换热器2	36.70	35.25	3.57	3.51
总计	534.79	490.84	52.13	48.86

Fig.7 Exergy loss ratios of different equipment

Fig.8 The influence of generation temperature on the exergy loss coefficient

Fig.9 The COP varied with the generation temperature

Fig.10 The ECOP varied with the generation temperature

Fig.11 The influence of the Tabs, Tres on the Ω

Fig.12 The influence of the Tabs, Tres on COP

Fig.13 The influence of the Tabs, Tres on Ω

Fig.14 The influence of desorption temperature on Ω

Fig.15 The influence of desorption temperature on COP

Fig.16 The influence of desorption temperature on ECOP

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Energy and exergy analysis of a solution cross-type absorption-resorption heat pump using NH₃/H₂O as working fluid

氨水溶液交叉型再吸收式热泵的能量及分析

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