Thermodynamic analysis of a novel chemical heat pump cycle based on the physical-chemical thermal effects of reversible reaction

Dai, Suzhou; Yin, Yonggao; Li, Weige; Zhang, Fan

doi:10.1016/j.enconman.2020.113419

Cited by 11 publications

(11 citation statements)

References 39 publications

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“…Combining eqs and , we can get, ln nobreak0em.25em⁡ p = true − normalΔ normalr H normalm θ 3 R true︸ Enthalpy change term 1 T + true normalΔ normalr S normalm θ 3 R − 1 3 ln nobreak0em.25em⁡ 4 27 + ln nobreak0em.25em⁡ p θ true︸ Entropy change term Δ r H m θ and Δ r S m θ are temperature-dependent. In the authors’ previous work, the effect of temperature on the Δ r H m θ was considered, and it was found that it varies slightly with temperature over the temperature range of interest (about 1.67%). Therefore, temperature dependence is ignored in the present work.…”

Section: Methodsmentioning

confidence: 99%

“…Solar energy, geothermal energy, industrial waste heat, and equipment heat dissipation are all forms of low-grade heat that, if properly recovered, would result in significant energy savings and reduced CO 2 emissions. , However, there are still some problems with conventional low-grade heat thermal management , and utilization technologies. Before temperature upgrading, most low-grade heat is difficult to use directly for space heating or industrial processes .…”

Section: Introductionmentioning

confidence: 99%

“…Because of its excellent properties, AC has been tested for a variety of low-grade heat thermal management applications. ,− As an example, Johnson et al , verified that the addition of AC significantly improved, by 58%, the heat transfer of the heat exchange reactor in a novel low-grade heat thermal management system. Koutinas et al proposed a thermochemical solar energy storage system based on the reaction of CO 2 , NH 3 , and AC.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Solvent Effect on the Chemical Equilibrium of Ammonium Carbamate for Chemical Heat Pump

Dai

Yin

Wang

et al. 2023

Ind. Eng. Chem. Res.

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Chemical heat pump based on ammonium carbamate (AC) is a promising low-grade heat utilization technology. It is essential to know the chemical equilibrium properties in the application of AC-based technologies. AC is usually mixed with solvents to realize circulation. However, the existing studies mainly focus on AC in the solid phase. Therefore, the influence of solvents on the chemical equilibrium of AC was experimentally investigated in this work. The results confirm the solvent effect on the equilibrium pressure of AC in the range of 10∼90 °C. For solvents capable of dissolving AC, the equilibrium pressure increases with both AC concentration and temperature. The solvent effect is mainly due to the influence on both the reaction enthalpy and entropy change terms. An equilibrium pressure–temperature–concentration relationship of AC solution is established. These results provide essential parameters for the design and operation of low-grade heat management and utilization systems based on AC.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Solvent Effect on the Chemical Equilibrium of Ammonium Carbamate for Chemical Heat Pump

Dai

Yin

Wang

et al. 2023

Ind. Eng. Chem. Res.

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“…Finite time thermodynamic (FTT) theory has been widely used in various heat engine cycles and has made great progress [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 ]. In addition to analyzing the power output (

) and efficiency (

) performance of common engines, FTT has also been applied to heat pumps [ 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 ], refrigerators [ 47 , 48 , 49 , 50 , …”

Section: Introductionmentioning

confidence: 99%

Four-Objective Optimization of an Irreversible Magnetohydrodynamic Cycle

Chen

et al. 2022

Entropy

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Based on the existing model of an irreversible magnetohydrodynamic cycle, this paper uses finite time thermodynamic theory and multi-objective genetic algorithm (NSGA-II), introduces heat exchanger thermal conductance distribution and isentropic temperature ratio of working fluid as optimization variables, and takes power output, efficiency, ecological function, and power density as objective functions to carry out multi-objective optimization with different objective function combinations, and contrast optimization results with three decision-making approaches of LINMAP, TOPSIS, and Shannon Entropy. The results indicate that in the condition of constant gas velocity, deviation indexes are 0.1764 acquired by LINMAP and TOPSIS approaches when four-objective optimization is performed, which is less than that (0.1940) of the Shannon Entropy approach and those (0.3560, 0.7693, 0.2599, 0.1940) for four single-objective optimizations of maximum power output, efficiency, ecological function, and power density, respectively. In the condition of constant Mach number, deviation indexes are 0.1767 acquired by LINMAP and TOPSIS when four-objective optimization is performed, which is less than that (0.1950) of the Shannon Entropy approach and those (0.3600, 0.7630, 0.2637, 0.1949) for four single-objective optimizations, respectively. This indicates that the multi-objective optimization result is preferable to any single-objective optimization result.

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“…volume expansion or directed difts and rotations, is generated from chemical potential grandients [5][6][7][8][9][10][11], from the splitting of chemical bonds (molecular motors) [12,13] as in ATP hydrolysis, from thermal diffusion modelled by Langevin and Fokker-Planck equations (Brownian motors) [10,14,15], and from surface energy in interface phenomena like tears of wine, beating oil lenses, and self-oscillating pendant droplets [16]. Recent technologically oriented applications are syngas production [17], capacitive deionisation for desalinisation of blackish water [18,19], CO 2 capture by carbonation-decarbonation cycles [20], solardriven CO 2 reduction [21], chemical looping for hydrogen production [22,23] and for energy and carbon storage [24,25], low-grade heat harvesting [26][27][28], pyrolytic reactions to increase the efficiency of turbine engines [29].…”

Section: Introductionmentioning

confidence: 99%

Quantum thermochemical engines

Marzolino¹

2022

Preprint

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Convertion of chemical energy into mechanical work is the fundamental mechanism of several natural phenomena at the nanoscale, like molecular machines and Brownian motors. Quantum mechanical effects are relevant for optimising these processes and to implement them at the atomic scale. This paper focuses on engines that transform chemical work into mechanical work through energy and particle exchanges with thermal sources at different chemical potentials. Irreversibility is introduced by modelling the engine transformations with finite-time dynamics generated by a time-depending quantum master equation. Quantum degenerate gases provide maximum efficiency for reversible engines, whereas the classical limit implies small efficiency. For irreversible engines, both the output power and the efficiency at maximum power are much larger in the quantum regime than in the classical limit. The analysis of ideal homogeneous gases grasps the impact of quantum statistics on the above performances, which persists in the presence of interactions and more general trapping. The performance dependence on different types of Bose-Einstein Condensates (BECs) is also studied. BECs under considerations are standard BECs with a finite fraction of particles in the ground state, and generalised BECs where eigenstates with parallel momenta, or those with coplanar momenta are macroscopically occupied according to the confinement anisotropy. Quantum statistics is therefore a resource for enhanced performances of converting chemical into mechanical work.

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Thermodynamic analysis of a novel chemical heat pump cycle based on the physical-chemical thermal effects of reversible reaction

Cited by 11 publications

References 39 publications

Solvent Effect on the Chemical Equilibrium of Ammonium Carbamate for Chemical Heat Pump

Solvent Effect on the Chemical Equilibrium of Ammonium Carbamate for Chemical Heat Pump

Four-Objective Optimization of an Irreversible Magnetohydrodynamic Cycle

Quantum thermochemical engines

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