Dimensioning nomograms for the design of fixed-bed solid-gas thermochemical reactors with various geometrical configurations

Stitou, Driss; Crozat, G.

doi:10.1016/s0255-2701(96)04172-4

Cited by 23 publications

(5 citation statements)

References 6 publications

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“…Other authors also refer to ΔT with the term "equilibrium temperature drop", e.g. Stitou et al [7]. From the prior discussion on the thermal sensitivity studies, we learned that the parameters related to heat transfer account for approximately 85% of the overall sensitivity of the maximum thermal power.…”

Section: Global Performance: Maximum Thermal Powermentioning

confidence: 99%

“…A common assumption in the design of thermochemical TES is that the overall process is controlled by the rate of heat transfer, and, more specifically, by mainly the low thermal conductivity of the reactive bulk phase, which has therefore been subject to extensive investigations and enhancement approaches. If, however, the storage design is improved towards higher specific thermal powers, the relative impact of the contact heat transfer coefficient at the bulk/heat exchanger boundary becomes increasingly important [7], [8]. The contact heat transfer coefficient depends on the "arrangement" of the storage material in the reaction chamber, e.g.…”

Section: Introductionmentioning

confidence: 99%

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Performance analysis of a gas-solid thermochemical energy storage using numerical and experimental methods

Stengler

Bürger

Linder

2021

International Journal of Heat and Mass Transfer

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Section: Global Performance: Maximum Thermal Powermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Performance analysis of a gas-solid thermochemical energy storage using numerical and experimental methods

Stengler

Bürger

Linder

2021

International Journal of Heat and Mass Transfer

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“…When ammonia is the refrigerant, the following reactions will occur inside the different reactors if the operation and equilibrium conditions are different: The difference between the operating condition and the thermodynamic equilibrium is known as equilibrium droppressure equilibrium drop (∆P equ ) or temperature equilibrium drop (∆T equ ), depending on the variable of interest. [9][10][11][12][13] The equilibrium drop is the driving force for the chemical reaction and, thus, influences the reaction rate and the specific thermal power of the system. Although higher equilibrium drop results in higher specific cooling power, it may also result in lower coefficient of performance (COP) due to the larger demand of energy.…”

Section: Description Of the Resorption Cyclementioning

confidence: 99%

Choice of Low Temperature Salt for a Resorption Refrigerator

Bao

Oliveira

Wang

et al. 2010

Ind. Eng. Chem. Res.

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Three bench-scale resorption systems were compared with respect to the degree of conversion, the specific cooling power, and the influence of the working condition on the temperature equilibrium drop. The mass of refrigerant that reacted during specified periods of each working condition studied was assessed gravimetrically. The three systems had MnCl2 in the main reactor, and they were designed to provide a cooling effect at 0 and at −5 °C. However, each system had a different salt (BaCl2, NaBr, or NH4Cl) in the reactor employed for cold production. The system with NH4Cl was the most suitable for cold production at the temperatures indicated above, whereas the system with BaCl2 was not suitable to operate at these levels of cooling production. Thus, we designed and manufactured a larger resorption system and assessed the feasibility of using this system to refrigerate a 33 L cold box, with two temperature zones. When the ambient temperature was 30 °C, the air temperature in the bottom of the cold box could be kept below 0 °C for 5 h, while the temperature of the upper zone remained below 6 °C for about 2.5 h.

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“…Global models deal with thermal conductivity, specific heat, and permeability averages. Analytical models consider reaction times and geometrical configurations [19].…”

Section: Introductionmentioning

confidence: 99%

Modeling a Thermochemical Reactor of a Solar Refrigerator by BaCl2-NH3 Sorption Using Artificial Neural Networks and Mathematical Symmetry Groups

Meza-Cruz

Pilatowsky

Pérez-Ramírez

et al. 2020

Mathematical Problems in Engineering

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The aim of this work is to present a model for heat transfer, desorbed refrigerant, and pressure of an intermittent solar cooling system’s thermochemical reactor based on backpropagation neural networks and mathematical symmetry groups. In order to achieve this, a reactor was designed and built based on the reaction of BaCl2-NH3. Experimental data from this reactor were collected, where barium chloride was used as a solid absorbent and ammonia as a refrigerant. The neural network was trained using the Levenberg–Marquardt algorithm. The correlation coefficient between experimental data and data simulated by the neural network was r = 0.9957. In the neural network’s sensitivity analysis, it was found that the inputs, reactor’s heating temperature and sorption time, influence neural network’s learning by 35% and 20%, respectively. It was also found that, by applying permutations to experimental data and using multibase mathematical symmetry groups, the neural network training algorithm converges faster.

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Dimensioning nomograms for the design of fixed-bed solid-gas thermochemical reactors with various geometrical configurations

Cited by 23 publications

References 6 publications

Performance analysis of a gas-solid thermochemical energy storage using numerical and experimental methods

Performance analysis of a gas-solid thermochemical energy storage using numerical and experimental methods

Choice of Low Temperature Salt for a Resorption Refrigerator

Modeling a Thermochemical Reactor of a Solar Refrigerator by BaCl2-NH3 Sorption Using Artificial Neural Networks and Mathematical Symmetry Groups

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