A Hybrid Compression-Absorption High Temperature Heat Pump Cycles for Industrial Waste Heat Recovery

doi:10.16183/j.cnki.jsjtu.2020.023

Abstract

Abstract:

Aimed at the problem that the conventional absorption heat pumps and compression heat pumps cannot take into account the temperature rise and efficiency, this paper proposes the use of a thermally-coupled hybrid compression-absorption heat pump to achieve high-efficiency and high-temperature output. To meet the demands of different scenarios, a large-temperature-lift cycle and a high-temperature-output cycle are constructed. R245fa and lithium bromide aqueous solution are used as working substance. For output temperature above 100℃, Aspen Plus software is used to establish a mathematical model to predict the cycle performance for calculation. The results show that the optimized coefficient of performance(COP) can be 2.58 or higher when the large-temperature-lift cycle is used to recover the waste heat at 30-40℃. When the high-temperature-output cycle is used to recycle waste heat at 60-70℃, the optimized COP of the cycle can reach 2.83. The cycles proposed are more advantageous than the R245fa compression cycle on temperature lift, output temperature, and efficiency.

Key words: waste heat, heat pump, compression, absorption, recovery, Aspen Plus software

CLC Number:

TK123

AN Meiyan, ZHAO Xinrui, XU Zhenyuan, WANG Ruzhu. A Hybrid Compression-Absorption High Temperature Heat Pump Cycles for Industrial Waste Heat Recovery[J]. Journal of Shanghai Jiao Tong University, 2021, 55(4): 434-443.

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序号	T_c/℃	T_e/℃	COP₁₉	COP	Δ₁/%
1	75	40	3.335	3.3826	1.430
2	80	45	3.450	3.4499	0.003
3	85	50	3.600	3.5121	2.440

序号	T_g/℃	T_a/℃	COP₂₀	COP	Δ₂/%
1	70.5	105	0.4835	0.4804	0.64
2	70.5	107	0.4820	0.4798	0.46
3	70.5	109	0.4800	0.4791	0.19