A high-temperature hybrid absorption-compression heat pump for waste heat recovery

Liu, Changchun; Jiang, Yingchun; Han, Wei; Kang, Qilan

doi:10.1016/j.enconman.2018.07.027

Cited by 63 publications

(7 citation statements)

References 38 publications

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“…Two absorption systems with LiBr‐water as working‐pair are established by Hong and Liu and low‐pressure steam is generated by the systems, respectively. Saturated steam at 0.5 MPa is generated by an ammonia‐water absorption‐compression heat pump from the sensible heat of flue gas below 150°C . Thus, the pressured steam generation experiment should be designed and conducted in the near future.…”

Section: Resultsmentioning

confidence: 99%

Pre‐adsorption of low‐grade waste steam for high‐temperature steam generation by using composite zeolite and long‐term heat storage salt of MgSO ₄

Zhang

Xue

et al. 2020

Int J Energy Res

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Adsorptive heat transformer is a promising technology for waster heat recovery and global energy conservation. A novel cyclic adsorption heating system based on direct contact heat exchange method has been established for the purpose of high-temperature steam generation from hot water. Pre-adsorption is originally proposed before generation phase to enhance the system performance with composite zeolite 13X and MgSO 4 in the open-loop adsorption heating system. Composite zeolite is prepared by impregnation method. Experimental results show steam with temperature higher than 200 C is generated from inlet water at 72.0 C. During regeneration phase, dry air at 130 C and relative humidity of 7.37% is employed. Gross temperature lift is 95.0 C to 103 C for different pre-adsorption conditions. The effective steam generation time with pre-adsorption temperature at 90.0 C is prolonged by 27.4%. Meanwhile, the mass of steam is elevated by 16.2% compared with the cycle without pre-adsorption. Exergy coefficient of performance is upgraded by 14.7% and specific heating power for steam generation is increased by 16.0%. The preadsorption operation achieved the goal of recovery of low-grade waste steam on adsorbents to enhance the subsequent high-temperature steam generation. After pre-adsorption operation, the packed bed reaches adsorption and thermal equilibrium more quickly during generation phase. Thus, dynamic steam generation is significantly intensified and then system performance is improved correspondingly. K E Y W O R D S adsorption heating, composite adsorbents, pre-adsorption, steam generation | INTRODUCTIONGlobal primary energy consumption in 2018 grew at a rate of 2.9% which is twice as much as the 10-year average. China together with the US and India accounted for more than two-thirds of the global increase in energy demand. Particularly energy-intensive industries such as the steel industry occupied a quarter of China's energy consumption and greatly dampened overall energy growth. 1 However, 15% to 40% of energy investment in China was dissipated as waste heat to the atmosphere in industrial sectors like cement, iron and steel, and glass in

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Section: Resultsmentioning

confidence: 99%

Pre‐adsorption of low‐grade waste steam for high‐temperature steam generation by using composite zeolite and long‐term heat storage salt of MgSO ₄

Zhang

Xue

et al. 2020

Int J Energy Res

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“…Liu et al used lowtemperature waste heat to power a hybrid system combining the ARS with a heat pump and found that the coefficient of performance (COP) and the exergy efficiency are 5.49 and 47.62%, respectively. 8 Garimella et al applied a hybrid system in a ship to provide the cooling energy and indicated that the proposed system can save 31% electricity consumption. 9 These literature studies represent that the ARS can recover low-grade waste heat effectively.…”

Section: ■ Introductionmentioning

confidence: 99%

Energy, Exergy, and Economic Analysis and Multiobjective Optimization of a Cascade Coupling System Driven by Low-Grade Waste Heat in Hot Summer and Cold Winter Areas of China

Wang

et al. 2021

ACS Sustainable Chem. Eng.

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This work proposes a cascade coupling system to recover low-grade waste heat. The hybrid system performs well in hot summer and cold winter areas of China. The economy, energy, and exergy analysis and multiobjective optimizations are conducted. Nondominated sorting genetic algorithm II is applied to realize the optimization process because of the contradiction between the three objective functions. The Pareto solutions are obtained, and the relationships between two different objectives are analyzed. The final optimal solutions are determined by the technique for order preference by similarity to an ideal solution method and the Shannon entropy method. Four schemes aiming at the maximum coefficient of performance (scheme 1), minimum total annual cost (scheme 2), minimum total exergy destruction (scheme 3), and multiobjective optimization (scheme 4) are studied. The results show that the minimum values of the total annual cost and the total exergy destruction are 57.73 × 10 4 $ and 336.91 kW, respectively. The maximum coefficient of performance is 0.61. The multiobjective optimization solutions achieve a 4.12% higher value than the minimum coefficient of performance, while the total annual cost and the total exergy destruction of solutions are 1.86 and 0.58%, respectively, lower than the maximum values. This work presents a deeper dissection and a multiobjective optimization of the cascade system and provides guidance for the development of low-grade waste heat recovery technologies.

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“…If the fossil fuel of the heating furnace is not fully burned, it will cause problems such as low heating efficiency and large harmful gas emissions [9,10]. Dehghan [11] constructed a mathematical model for the different circulation modes of the high-temperature sewage source heat pump systems which can replace the traditional heating furnace systems; through an analysis of the thermal performance of the entransy dissipation system in the heat exchange processes on the load side and the source side, the study proposed a reasonable value for the temperature drop of the sewage on the load side and the source side.…”

Section: Introductionmentioning

confidence: 99%

A Smart Community Waste Heat Recovery System Based on Air Source-Sewage Source Compound Heat Pump

Cheng¹,

Wu²,

Bai³

2021

IJHT

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Compared with the traditional hot water production methods, heat pump systems have the unique advantages of high efficiency, energy saving, and eco-friendly, so they have a very good promotion and application prospect. The sewage source heat pump systems can recover the waste heat of high-temperature sewage produced in residential communities, for this reason, this study integrated the proven air source heat pump technology with the sewage source heat pump technology and conducted a research on the smart community waste heat recovery system based on the air-source/sewage-source Compound Heat Pump system (CHP system). In the paper, the design steps and equipment selection flow of the proposed system were given, the waste heat utilization rate of the proposed system was calculated, and the obtained experimental results verified the energy-saving effect of the proposed system, which had provided a reference for the application of the compound heat pumps in other occasions.

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A high-temperature hybrid absorption-compression heat pump for waste heat recovery

Cited by 63 publications

References 38 publications

Pre‐adsorption of low‐grade waste steam for high‐temperature steam generation by using composite zeolite and long‐term heat storage salt of MgSO ₄

Pre‐adsorption of low‐grade waste steam for high‐temperature steam generation by using composite zeolite and long‐term heat storage salt of MgSO ₄

Energy, Exergy, and Economic Analysis and Multiobjective Optimization of a Cascade Coupling System Driven by Low-Grade Waste Heat in Hot Summer and Cold Winter Areas of China

A Smart Community Waste Heat Recovery System Based on Air Source-Sewage Source Compound Heat Pump

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A high-temperature hybrid absorption-compression heat pump for waste heat recovery

Cited by 63 publications

References 38 publications

Pre‐adsorption of low‐grade waste steam for high‐temperature steam generation by using composite zeolite and long‐term heat storage salt of MgSO 4

Pre‐adsorption of low‐grade waste steam for high‐temperature steam generation by using composite zeolite and long‐term heat storage salt of MgSO 4

Energy, Exergy, and Economic Analysis and Multiobjective Optimization of a Cascade Coupling System Driven by Low-Grade Waste Heat in Hot Summer and Cold Winter Areas of China

A Smart Community Waste Heat Recovery System Based on Air Source-Sewage Source Compound Heat Pump

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Pre‐adsorption of low‐grade waste steam for high‐temperature steam generation by using composite zeolite and long‐term heat storage salt of MgSO ₄

Pre‐adsorption of low‐grade waste steam for high‐temperature steam generation by using composite zeolite and long‐term heat storage salt of MgSO ₄