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Journal articles on the topic 'Heat of sorption'

Author: Grafiati

Published: 11 February 2023

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1

Huang, Yuxiang, Ru Liu, Fandan Meng, Yanglun Yu, and Wenji Yu. "The Influence of Heat Treatment on the Static and Dynamic Sorptive Behavior of Moso Bamboo (Phyllostachys pubescens)." Advances in Polymer Technology 2019 (May 2, 2019): 1–7. http://dx.doi.org/10.1155/2019/4949786.

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The influence of heat treatment on moisture sorption behavior of moso bamboo (Phyllostachys pubescens), especially under dynamic sorption conditions, was investigated. Moso bamboo was heated to 180 and 200°C for 8 h to investigate the chemical components and sorptive behavior at sinusoidal relative humidity (RH) and constant humidity. The results of chemical components revealed that the content of holocellulose,α-cellulose, and hemicellulose decreased while that of lignin increased slightly with increasing treatment temperatures. The results of static adsorption at constant RH showed that 200°C treated bamboo exhibited the lowest moisture content and moisture sorption coefficient. The results of dynamic sorptive behavior indicated that the moisture content changed sinusoidally but lagged behind the triggering sinusoidal RH changes. Heat-treated bamboo presented greater phase lag and smaller amplitudes of moisture content and sorption hysteresis due to the hemicellulose removal.

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2

Štencl, Jiří. "Effect of temperature and water activity on heat transfer in parsley leaves in the range of temperatures 10–30 °C." Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis 55, no. 5 (2007): 181–86. http://dx.doi.org/10.11118/actaun200755050181.

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The equilibrium moisture contents of parsley leaves were measured by the gravimetric dynamic method with continuous recording of changes in sample weight. Consequently water activity values were determined. Henderson equation was found to be a good model both for moisture adsorption and desorption. Isosteric heat of sorption was defined and determined in the temperature range of 10–30 °C. Clausius-Clapeyron equation was used to calculate the isosteric heat of sorption since no dependence on temperature in the analysed range was observed. The isosteric heats of sorption (qnst) were indicated graphic in the form qnst versus moisture content. Values for isosteric heat of sorption ranged from 54.41 to 46.85 kJ/mol.

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3

Morawetz, Ernst. "Sorption-compression heat pumps." International Journal of Energy Research 13, no. 1 (1989): 83–102. http://dx.doi.org/10.1002/er.4440130109.

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4

Hossain, M. D., B. K. Bala, M. A. Hossain, and M. R. A. Mondol. "Sorption isotherms and heat of sorption of pineapple." Journal of Food Engineering 48, no. 2 (May 2001): 103–7. http://dx.doi.org/10.1016/s0260-8774(00)00132-1.

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5

Quirijns, Elisabeth J., Anton JB van Boxtel, Wilko KP van Loon, and Gerrit van Straten. "Sorption isotherms, GAB parameters and isosteric heat of sorption." Journal of the Science of Food and Agriculture 85, no. 11 (2005): 1805–14. http://dx.doi.org/10.1002/jsfa.2140.

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6

Vega-Gálvez, A., R. Lemus-Mondaca, P. Fito, and A. Andrés. "Note: Moisture Sorption Isotherms and Isosteric Heat of Red Bell Pepper (var. Lamuyo)." Food Science and Technology International 13, no. 4 (August 2007): 309–16. http://dx.doi.org/10.1177/1082013207082530.

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Sorption isotherms of red pepper (var. Lamuyo) were determined at three temperatures (10, 20 and 30°C) in a range of water activity from 0.10 to 0.96. BET, GAB, Halsey, Herderson, Caurie, Smith, Oswin and Iglesias—Chirife equations were tested for modelling the sorption isotherms. The statistical evaluation of fit quality of the preceding models showed good results using the BET, GAB, Halsey and Iglesias—Chirife models on experimental sorption data. The BET and GAB models showed monolayer moisture contents from 0.07 to 0.10 g water/g (d.b.); however, they did not show direct dependence on temperature. The Clausius—Clapeyron equation satisfactorily determined the sorption isosteric heats, which were found to increase as the moisture content decreased; the desorption heat (74.2kJ/mol) was higher than that of adsorption heat (36.9kJ/mol). The preceding experimental data showed a good quality fit when evaluated with the Tsami equation.

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7

Mulet, A., J. Garcia-Reverter, R. Sanjuan, and J. Bon. "Sorption Isosteric Heat Determination by Thermal Analysis and Sorption Isotherms." Journal of Food Science 64, no. 1 (January 1999): 64–68. http://dx.doi.org/10.1111/j.1365-2621.1999.tb09862.x.

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8

Chen, Chiachung. "Obtaining the isosteric sorption heat directly by sorption isotherm equations." Journal of Food Engineering 74, no. 2 (May 2006): 178–85. http://dx.doi.org/10.1016/j.jfoodeng.2005.01.041.

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9

Nopens, Wadsö, Ortmann, Fröba, and Krause. "Measuring the Heat of Interaction between Lignocellulosic Materials and Water." Forests 10, no. 8 (August 9, 2019): 674. http://dx.doi.org/10.3390/f10080674.

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Research Highlights: When investigating the sorption of water on lignocellulosic materials, the sorption or mixing enthalpy is an interesting parameter that, together with the sorption isotherms commonly measured, can be used to characterize and understand the sorption process. We have compared different methods to assess these enthalpies. Additionally, we propose a sorption nomenclature. Background and Objectives: Sorption enthalpies are non-trivial to measure. We have, for the first time, measured sorption enthalpies on the same materials with four different methods, to be able to compare the method’s strengths and weaknesses. Materials and Methods: The following four methods were used on beech and Scots pine wood: isosteric heat, solution calorimetry, sorption calorimetry, and RH perfusion calorimetry. Results: The results for beech and pine were similar, and were in general agreement with the literature. We do not recommend one of the methods over the others, as they are quite different, and they can therefore be used to elucidate different aspects of the interactions between water and, for example, novel biobased materials (modified woods, cellulose derivatives, and regenerated cellulose).

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10

Chayjan, R. A., and M. Esna-Ashari. "Modeling of heat and entropy sorption of maize (cv. Sc704): neural network method." Research in Agricultural Engineering 56, No. 2 (June 7, 2010): 69–76. http://dx.doi.org/10.17221/37/2009-rae.

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Equilibrium moisture content of maize affects its values of dehydration heat and entropy. Precise prediction of heat and entropy with regard to its equilibrium moisture content is a simple and fast method for proper estimation of energy required for dehydration of maize and simulation of dried maize storage. Artificial neural network and thermodynamic equations for computation of maize heat and entropy of sorption were used, as a new method. The artificial neural network method for prediction of the equilibrium moisture content of maize was utilized. The heat of sorption of maize is predicted by a power model. After well training of equilibrium moisture content data sets using the artificial neural network models, predictive power of the model was found to be high (R<sup>2</sup> = 0.99). A power regression model was also developed for entropy of sorption. At moisture content above 11% (d.b.) the heat and entropy of sorption of maize decreased smoothly and they were highest at moisture content about 8% (d.b.).

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11

Rohvein, C., E. Santalla, and M. C. Gely. "Note: Estimation of Sorption Isotherm and the Heat of Sorption of Quinoa (Chenopodium quinoaWilld.) Seeds." Food Science and Technology International 10, no. 6 (December 2004): 409–13. http://dx.doi.org/10.1177/1082013204049513.

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A modified Guggenheim-Anderson-de Boer (GAB) equation of four parameters was obtained to adjust the experimental sorption data for washed quinoa seeds. From the original GAB equation, only the monolayer moisture resulted in a dependence-temperature parameter showing a negative exponential trend with the absolute temperature. The results of the statistical adjustment showed that the new four parameters GAB equation adequately represented the experimental data in the range of 20 to 30°C with a corrected correlation coefficient of 0.999. The sorption heat of washed quinoa seeds was estimated by combining the GAB model with the Clapeyron equation and it resulted approximately 32% higher than the sorption heat of pure water in the temperature ranges between 20 and 60°C for temperature and 0.003 and 0.30 for moisture content. Using Othmer method the ratio of latent heats varied from 1.18 to 1.0474 in the range of moisture content studied.

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12

Krönauer, Andreas, Eberhard Lävemann, Sarah Brückner, and Andreas Hauer. "Mobile Sorption Heat Storage in Industrial Waste Heat Recovery." Energy Procedia 73 (June 2015): 272–80. http://dx.doi.org/10.1016/j.egypro.2015.07.688.

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13

Cahyanti, Margareta Novian, and Alvama Pattiserlihun. "Thermodynamic Properties of Water Adsorption on Gaplek Flour Fortified with Red Bead Tree Seed." Molekul 13, no. 2 (December 8, 2018): 114. http://dx.doi.org/10.20884/1.jm.2018.13.2.411.

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The moisture sorption isotherm data of gaplek flour fortified with red bead tree seed stored in a chamber, the relative humidity of chamber ranging from 10% to 97% regulated using a saturated salt solution, was determined at three temperatures 25°, 35°, and 45 °C. The experimental data used to determine the thermodynamic functions were isosteric heat of sorption, sorption entropy, and free energy changes. The sorption isosteric heats were determined by the application of the Clausius–Clapeyron equation. Isosteric heats of adsorption increased to maximum level and then declined with increase of moisture content. Adsorption entropy increased to maximum level and then declined with the increase of moisture content. The free energy changes increased with increase in moisture content. The spreading pressure increased with increasing water activity.

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14

Vasiliev, L. L. "Heat Pipes and Solid Sorption Machines;." Heat Transfer Research 35, no. 5-6 (2004): 393–405. http://dx.doi.org/10.1615/heattransres.v35.i56.80.

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15

Hwang, Yunho, and Alberto Coronas. "2014 International Sorption Heat Pump Conference." Science and Technology for the Built Environment 21, no. 3 (March 18, 2015): 247. http://dx.doi.org/10.1080/23744731.2015.1022054.

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16

Vasiliev, L. L., D. A. Mishkinis, A. A. Antukh, and L. L. Vasiliev. "Solar–gas solid sorption heat pump." Applied Thermal Engineering 21, no. 5 (April 2001): 573–83. http://dx.doi.org/10.1016/s1359-4311(00)00069-7.

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17

shusheng, Pang, T. A. G. Langrish, and R. B. Keey. "THE HEAT OF SORPTION OF TIMBER." Drying Technology 11, no. 5 (January 1993): 1071–80. http://dx.doi.org/10.1080/07373939308916883.

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18

Sorin, M., P. Le Goff, J. Paris, and V. Galatone. "Thermodynamic efficiency of sorption heat pumps." Renewable Energy 5, no. 1-4 (August 1994): 412–14. http://dx.doi.org/10.1016/0960-1481(94)90407-3.

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19

Miles, Daniel J., David M. Sanborn, Gary A. Nowakowski, and Sam V. Shelton. "Gas fired sorption heat pump development." Heat Recovery Systems and CHP 13, no. 4 (July 1993): 347–51. http://dx.doi.org/10.1016/0890-4332(93)90060-9.

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20

Schneider, Anna M., B. N. Hoschke, and H. J. Goldsmid. "Heat Transfer through Moist Fabrics." Textile Research Journal 62, no. 2 (February 1992): 61–66. http://dx.doi.org/10.1177/004051759206200201.

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A transient technique is used to measure the effective thermal conductivity of textile fabrics containing varying amounts of water. Conductivity increases with water content and also depends on a fiber's sorption properties. Wool, which is a highly absorbent fiber, has better insulating properties under moist conditions than polypropylene, porous acrylic, and cotton. Heat transfer in moist textiles takes place by conduction, infrared radiation, and distillation. Until the fiber is saturated, the evaporation process is determined mainly by the fiber's sorption properties.

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21

Yu, Y., L. W. Wang, and G. L. An. "Experimental study on sorption and heat transfer performance of NaBr-NH3 for solid sorption heat pipe." International Journal of Heat and Mass Transfer 117 (February 2018): 125–31. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2017.09.129.

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22

KIPLAGAT, J. K., R. Z. WANG, T. X. LI, and R. G. OLIVEIRA. "ENHANCEMENT OF HEAT AND MASS TRANSFER IN SOLID GAS SORPTION SYSTEMS." International Journal of Air-Conditioning and Refrigeration 20, no. 01 (March 2012): 1130001. http://dx.doi.org/10.1142/s2010132511300011.

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Solid gas sorption systems driven by heat have gained much attention due to their energy conservation and environmental benefits. These sorption machines can be driven by waste heat or renewable energy source such as solar energy, and can utilize natural working fluids with no GWP and ODP, such as water, methanol, and ammonia. However, poor heat transfer process and slow diffusion rate of the refrigeration gas in the adsorber have been identified as the main drawbacks limiting the cooling density performance, and consequently, commercialization of sorption machines. This paper provides a review of techniques that have been applied to enhance heat and mass transfer in solid gas sorption systems. These techniques mainly include the use of materials with high thermal conductivity, consolidation of adsorbents, and the use of specially designed heat exchangers in the adsorbers. The effect of these methods on the coefficient of performance and the specific cooling power is also discussed.

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23

Pumacahua-Ramos, Augusto, José Gomez, Javier Telis- Romero, Harvey Villa-Vélez, and Jose Lopes. "Isotherms and isosteric heat of sorption of two varieties of Peruvian quinoa." Scientia Agropecuaria 7 (December 31, 2016): 409–17. http://dx.doi.org/10.17268/sci.agropecu.2016.04.06.

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24

Politaeva, Natalia A., Vladimir V. Slugin, Elena A. Taranovskaya, Ivan N. Alferov, Maksim A. Soloviev, and Andrei M. Zakharevich. "GRANULATED SORPTION MATERIALS FOR WASTE WATERS PURUFUCATION FROM ZINK IONS (Zn2+)." IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENIY KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 60, no. 7 (August 24, 2017): 85. http://dx.doi.org/10.6060/tcct.2017607.5575.

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The article describes the main applications of biopolymer – chitosan, the most important of which are medicine and food industry. In recent times, many works devoted to the application of chitosan for wastewater treatment because it has a flocculation and sorption properties. The market price of chitosan is high, so it is proposed to create a granular composite sorption materials based on chitosan and waste of agricultural processing, which will reduce the cost and improve the sorption properties. As waste agricultural processing is proposed to use heat-treated threshing of millet which has high sorption properties. The composites, where the binder is chitosan and the filler - heat-treated threshing millet with different content (10 %; 20 %; 30 %; 40 % of the total weight) were obtained. The adsorption isotherms of zinc ions on the composite adsorbent materials with different content of filler were constructed and the values of maximum sorption capacity were calculated. The mechanical properties (abrasion and grindability) of the obtained composite sorption materials were determined and it was shown that the best sorption characteristics of composite material with the addition of the filler for 30%. The technological scheme of production of composite materials of the heat-treated millet threshing and chitosan for wastewater treatment was developed. The microstructural study of the obtained materials showed that heat-treated additive threshing of millet increases. The economic indicators of production of composite sorption materials were calculated and the methods of disposal were examined.Forcitation:Politaeva N.A., Slugin V.V., Taranovskaya E.A., Alferov I.N., Soloviev M.A., Zakharevich A.M. Granulated sorption materials for waste waters purufucation from zink ions (Zn2+). Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2017. V. 60. N 7. P. 85-90.

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25

Yu, Y., L. W. Wang, L. Jiang, P. Gao, and R. Z. Wang. "The feasibility of solid sorption heat pipe for heat transfer." Energy Conversion and Management 138 (April 2017): 148–55. http://dx.doi.org/10.1016/j.enconman.2017.01.052.

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26

Martínez-Las Heras, R., A. Heredia, M. L. Castelló, and A. Andrés. "Moisture sorption isotherms and isosteric heat of sorption of dry persimmon leaves." Food Bioscience 7 (September 2014): 88–94. http://dx.doi.org/10.1016/j.fbio.2014.06.002.

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27

Jhider, Nouha, and Mohamed Bagané. "Moisture sorption isotherms and isosteric heat of sorption of Tunisian clay product." Heat and Mass Transfer 55, no. 2 (July 18, 2018): 571–79. http://dx.doi.org/10.1007/s00231-018-2428-x.

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28

Vasiliev, L., O. Filatova, and A. Tsitovich. "Application of sorption heat pumps for increasing of new power sources efficiency." Archives of Thermodynamics 31, no. 2 (July 1, 2010): 21–43. http://dx.doi.org/10.2478/v10173-010-0007-8.

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Application of sorption heat pumps for increasing of new power sources efficiencyIn the 21st century the way to increase the efficiency of new sources of energy is directly related with extended exploration of renewable energy. This modern tendency ensures the fuel economy needs to be realized with nature protection. The increasing of new power sources efficiency (cogeneration, trigeneration systems, fuel cells, photovoltaic systems) can be performed by application of solid sorption heat pumps, regrigerators, heat and cold accumulators, heat transformers, natural gas and hydrogen storage systems and efficient heat exchangers.

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29

Simonson, C. J., and R. W. Besant. "Heat and Moisture Transfer in Energy Wheels During Sorption, Condensation, and Frosting Conditions." Journal of Heat Transfer 120, no. 3 (August 1, 1998): 699–708. http://dx.doi.org/10.1115/1.2824339.

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A numerical model for coupled heat and moisture transfer with sorption, condensation, and frosting in rotary energy exchangers is presented and validated with experimental data. The model is used to study condensation and frosting in energy wheels. Condensation/frosting increases with humidity and at some humidity level, water/frost will continually accumulate in the wheel. The sensitivity of condensation and frosting to wheel speed and desiccant type are studied. The energy wheel performance is also presented during both sorption and saturation conditions for a desicant coating with a Type I sorption isotherm (e.g., molecular sieve) and a linear sorption isotherm (e.g., silica gel). Simulation results show that the desiccant with a linear sorption curve is favorable for energy recovery because it has better performance characteristics and smaller amounts of condensation/frosting for extreme operating conditions.

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30

Soares Pereira, Maria Carolina, Jiří Štencl, Bohumíra Janštová, and Václav Vlášek. "Water sorption properties of Dutch type semi-hard cheese edge in the range of common storing temperatures." Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis 59, no. 5 (2011): 203–8. http://dx.doi.org/10.11118/actaun201159050203.

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Moisture sorption isotherms of Dutch type semi-hard cheese edge in the temperature range of 10–25 ºC and water activity (Aw) from 0.11 to 0.98 were determined using manometric method. The sorption curves had a sigmoid shape. The equilibrium moisture content (EMC) of cheese samples increased with an increase in Aw at a constant temperature both for water adsorption and desorption. An increase in temperature caused an increase in Aw for the same moisture content (MC) and, if Aw was kept constant, an increase in temperature caused a decrease in the amount of absorbed water. Critical values of equilibrium moisture content, corresponding to the Aw = 0.6, were between 11 % MC (w.b.) and 17 % MC (w.b.) both for moisture adsorption and desorption. Values of sorption heat were calculated from moisture sorption isotherms by applying the Clausius-Clapeyron equation. Values of the heat of desorption are higher than those of adsorption and the difference increases with the MC decrease. Heat of sorption decreased from 48.5 kJ/mol (~5.5 % MC w.b.) to the values approaching the heat of vaporization of pure water, free MC. The critical value for free water evaporation is about w = 27 % (w.b.) for the range of temperature 10–25 ºC.

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31

Vasiliev, Leonid L., and L. E. Kanonchik. "Development and Investigation of Sorption Heat Pumps." Heat Transfer Research 38, no. 7 (2007): 647–59. http://dx.doi.org/10.1615/heattransres.v38.i7.70.

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32

Al-Nori, Ammar, Ahmed Hussain, and Lamia Rejab. "Water sorption of heat–cured acrylic resin." Al-Rafidain Dental Journal 7, no. 2 (June 1, 2007): 186–94. http://dx.doi.org/10.33899/rden.2007.8961.

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33

Gao, Peng, Liang-Liang Shao, and Chun-Lu Zhang. "Pressure boost thermochemical sorption heat pump cycle." Energy 169 (February 2019): 1090–100. http://dx.doi.org/10.1016/j.energy.2018.12.119.

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34

Almjasheva, O. V., V. V. Gusarov, Ya B. Danilevich, A. N. Kovalenko, and V. L. Ugolkov. "Nanocrystals of ZrO2 as sorption heat accumulators." Glass Physics and Chemistry 33, no. 6 (December 2007): 587–89. http://dx.doi.org/10.1134/s1087659607060090.

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35

Ziegler, F. "Sorption heat pumping technologies: Comparisons and challenges." International Journal of Refrigeration 32, no. 4 (June 2009): 566–76. http://dx.doi.org/10.1016/j.ijrefrig.2009.03.007.

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36

Critoph, R. E. "Refrigeration and Heat Pumping with Sorption Processes." International Journal of Refrigeration 35, no. 3 (May 2012): 487–89. http://dx.doi.org/10.1016/j.ijrefrig.2012.02.006.

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37

Schumacher, Richard, and Hellmut G. Karge. "Sorption and Sorption Kinetics of Ethylbenzene in MFI-Type Zeolites Studied by a Barometric Technique." Collection of Czechoslovak Chemical Communications 64, no. 3 (1999): 483–94. http://dx.doi.org/10.1135/cccc19990483.

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The sorption and sorption kinetics of ethylbenzene in H-ZSM-5 zeolites was studied varying the experimental conditions over a broad range of temperature and concentration. Isotherms and heats of adsorption as well as intracrystalline diffusivities have been determined. The isosteric heat of adsorption decreases with increasing sorbate loading due to repulsive sorbate-sorbate interaction. The diffusivity remains independent of sorbate concentration at loadings lower than a critical value of about four molecules per unit cell, while a sharp decrease is observed at higher loadings. The critical concentration slightly depends on the temperature. The relationship between diffusivity, concentration and temperature can be tentatively interpreted in terms of a complex sorbate-sorbent interaction.

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38

Sosnowski, Marcin. "Evaluation of Heat Transfer Performance of a Multi-Disc Sorption Bed Dedicated for Adsorption Cooling Technology." Energies 12, no. 24 (December 8, 2019): 4660. http://dx.doi.org/10.3390/en12244660.

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The possibility of implementing the innovative multi-disc sorption bed combined with the heat exchanger into the adsorption cooling technology is investigated experimentally and numerically in the paper. The developed in-house sorption model incorporated into the commercial computational fluid dynamics (CFD) code was applied within the analysis. The research allowed to define the design parameters of the proposed type of the sorption bed and correlate them with basic factors influencing the performance of the sorption bed and its dimensions. The designed multi-disc sorption bed is characterized by great scalability and allows to significantly expand the potential installation sites of the adsorption chillers.

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39

Ouafi, N., H. Moghrani, N. Benaouada, N. Yassaa, R. Maachi, and R. Younsi. "Moisture sorption isotherms and heat of sorption of Algerian bay leaves (Laurus nobilis)." Maderas. Ciencia y tecnología 17, no. 4 (October 2015): 759–72. http://dx.doi.org/10.4067/s0718-221x2015005000066.

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40

Kaymak-Ertekin, Figen, and Atıl Gedik. "Sorption isotherms and isosteric heat of sorption for grapes, apricots, apples and potatoes." LWT - Food Science and Technology 37, no. 4 (June 2004): 429–38. http://dx.doi.org/10.1016/j.lwt.2003.10.012.

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41

Mohamed, Ait, M. Kouhila, A. Jamali, S. Lahsasni, and M. Mahrouz. "Moisture sorption isotherms and heat of sorption of bitter orange leaves (Citrus aurantium)." Journal of Food Engineering 67, no. 4 (April 2005): 491–98. http://dx.doi.org/10.1016/j.jfoodeng.2004.05.016.

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42

Horibe, Akihiko, Naoto Haruki, Yutaka Yamada, Kota Ishibashi, Tomohiro Maruyama, Shinnosuke Maeda, and Toru Kawamata. "Heat Release Behavior of Heat Storage System Using Organic Sorption Material." Proceedings of Conference of Chugoku-Shikoku Branch 2017.55 (2017): K0604. http://dx.doi.org/10.1299/jsmecs.2017.55.k0604.

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43

Meunier, F. "Solid sorption heat powered cycles for cooling and heat pumping applications." Applied Thermal Engineering 18, no. 9-10 (September 1998): 715–29. http://dx.doi.org/10.1016/s1359-4311(97)00122-1.

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44

Zheng, W., and W. M. Worek. "Readsorption Processes in a Sorption Bed Heat Exchanger During Pressurization and Depressurization." Journal of Heat Transfer 117, no. 4 (November 1, 1995): 865–70. http://dx.doi.org/10.1115/1.2836303.

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Readsorption occurs inside a sorbent-bed heat exchanger during the pressurization and depressurization processes, causing the adsorbate to be relocated from one end of the sorption bed heat exchanger to the other. In this paper, the readsorption processes are quantitatively determined for both the pressurization and depressurization processes in a sorbent-bed heat exchanger with a uniform initial temperature, loading, and pressure. Also, the readsorption that occurs during a typical operation of a two-bed sorption heat pump is quantified. The results show that the readsorption can cause as much as 30 percent of the ammonia in a sorbent-bed heat exchanger to be reallocated.

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45

Korpiun, P., W. Herrmann, A. Kindermann, M. Rothmeyer, and B. Büchner. "Sorption of water investigated with the photoacoustic effect." Canadian Journal of Physics 64, no. 9 (September 1, 1986): 1042–48. http://dx.doi.org/10.1139/p86-177.

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Water adsorbed in the bulk of a sample essentially modifies the heat capacity, thermal conductivity, and, therefore, the transport of heat. At small concentrations of adsorbed water, this effect governs the photoacoustic (PA) signal measured in a gas–microphone cell. At higher concentrations, temperature-induced periodical adsorption and desorption mainly determine the PA signal. This effect is described formally by extending a model of oscillating mass diffusion, developed earlier to explain the photoacoustic effect on liquids, to the process of sorption. Its contribution to the PA amplitude is proportional to the sorption isotherm multiplied by the heat of sorption. Measurements with zeolite as an adsorbent in equilibrium with water vapour confirm the model. In addition, qualitative measurements on a sheet of brass, on filter paper, and on pine wood are included.

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Sverguzova, S. V., I. G. Shaikhiev, L. Hunadi, and I. V. Bomba. "A Study of the Adsorption of Ni2+ Ions by Modified Peanut Processing Wastes." Ecology and Industry of Russia 24, no. 3 (March 4, 2020): 39–43. http://dx.doi.org/10.18412/1816-0395-2020-3-39-43.

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The sorption purification of model solutions from Ni2+ ions was studied using, as sorption materials, ground peanut peel of the original and heat-treated at a temperature of 250 °C and 350 °C. Isotherms of adsorption of Ni2+ ions by sorption materials were constructed in the range of initial concentrations up to 1000 mg/dm3 of the initial and thermally modified peanut peel. Isotherms are processed in the framework of the Langmuir, Freundlich and BET models. The kinetics of adsorption of Ni2+ ions by the initial and heat-treated peanut peel was studied. It was experimentally determined that the maximum sorption capacity of the initial peanut peel at an initial concentration of Ni2+ 1000 mg/dm3 ions is 0.6 mmol/g, and for annealed at 250 and 350 ° C – 0.66 and 0.78 mmol/g, respectively.

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Landfeld, A., M. Houška, and K. Hoke. "Sorption and thermal properties of rice, potato starch, and oat flakes." Czech Journal of Food Sciences 26, No. 6 (January 11, 2009): 413–20. http://dx.doi.org/10.17221/1363-cjfs.

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A precise design of the equipment for thermal sterilisation of rice, potato starch, and oat flakes by dry heat requires the knowledge of the relevant values of physical properties of these products. Water activity and enthalpy are presented as functions of temperature and humidity. Water activity was measured as a function of the moisture content and temperature in the desorption process that reproduces the real conditions existing during dry heat processing in the pilot rotating steriliser equipment. The heat of evaporation can be predicted from these data as a function of the moisture content of these products. DSC (differential scanning calorimetry) method was used for measuring the enthalpy of these products as a function of temperature during desorption of moist products starting from various levels of the moisture content. The total energy Ec necessary for heating the product and evaporation of the given amount of water can be calculated.

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Lavoyer, Fábia Carolina Gonçalves, Ana Lúcia Gabas, Wanderley Pereira Oliveira, and Javier Telis-Romero. "Study of adsorption isotherms of green coconut pulp." Food Science and Technology 33, no. 1 (March 8, 2013): 68–74. http://dx.doi.org/10.1590/s0101-20612013005000017.

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Brazil is considered one of the largest producers and consumers of tropical fruits. Green coconut (Cocos nucifera L.) stands out not only for its production and consumption, but also for the high amount of waste produced by coconut water industry and in natura consumption. Therefore, there is a need for utilization of this by-product. This study aims to study the adsorption isotherms of green coconut pulp and determine its isosteric heat of sorption. The adsorption isotherms at temperatures of 30, 40, 50, 60, and 70 °C were analyzed, and they exhibit type III behavior, typical of sugar rich foods. The experimental results of equilibrium moisture content were correlated by models present in the literature. The Guggenheim, Anderson and De Boer (GAB) model proved particularly good overall agreement with the experimental data. The heat of sorption determined from the adsorption isotherms increased with the decrease in moisture content. The heat of sorption is considered as indicative of intermolecular attractive forces between the sorption sites and water vapor, which is an important factor to predict the shelf life of dried products.

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Ouaabou, Rachida, Said Ennahli, Chira Di Lorenzo, Hafida Hanine, Aadil Bajoub, Rachid Lahlali, Ali Idlimam, Ahmed Ait Oubahou, and Mohamed Mesnaoui. "Hygroscopic Properties of Sweet Cherry Powder: Thermodynamic Properties and Microstructural Changes." Journal of Food Quality 2021 (December 1, 2021): 1–11. http://dx.doi.org/10.1155/2021/3925572.

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Understanding sorption isotherms is crucial in food science for optimizing the drying processes, enhancing the shelf-life of food, and maintaining food quality during storage. This study investigated the isotherms of sweet cherry powder (SCP) using the static gravimetric method. The experimental water sorption curves of lyophilized sweet cherry powder were determined at 30°C, 40°C, and 50°C. The curves were then fitted to six isotherm models: Modified GAB, Halsey, Smith, Oswin, Caurie, and Kühn models. To define the energy associated with the sorption process, the isosteric sorption heat, differential entropy, and spreading pressure were derived from the isotherms. Among the six models, the Smith model is the most reliable in predicting the sorption of the cherry powder with a determination coefficient (R2) of 0.9978 and a mean relative error (MRE) ≤1.61. The values of the net isosteric heat and differential entropy for the cherry increased exponentially as the moisture content decreased. The net isosteric heat values varied from 10.63 to 90.97 kJ mol−1, while the differential entropy values varied from 27.94 to 273.39 J. mol−1K−1. Overall, the enthalpy-entropy compensation theory showed that enthalpy-controlled mechanisms could be used to regulate water adsorption in cherry powders.

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Barnard, Rian George, Peter Christopher Clarke-Farr, and Abduraghman Latief. "Factors Affecting Sorption and Solubility of Denture Base Acrylic Materials: A Review." Annals of Dentistry 29 (February 23, 2022): 1–8. http://dx.doi.org/10.22452/adum.vol29no1.

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Heat-cured PMMA is one of the most frequently used materials in the manufacture of removable dentures. Heat-cured material used to fabricate dentures contain soluble elements, allowing the material to absorb and release substances. These factors all directly affect the longevity and performance of protheses fabricated from polymethyl methacrylate denture base material. Various procedures associated with fabrication of removable dentures from heat-cure denture base material are reported to significantly influence the sorption and solubility experienced by the prosthesis. A comprehensive search of peer-reviewed journals located within academic databases was conducted to identify relevant literature pertaining to sorption and solubility of denture base materials. Key aspects of each paper were captured in Microsoft® Excel® to record author/s, location, study design, sample size, methodology, results and conclusions. Mixing ratios and polymerisation cycles have been identified as variables that can negatively influence the rate of sorption and solubility of denture base materials during the fabrication process. Certain surface treatment procedures, as well as storing the denture in artificial saliva solution may reduce the levels of sorption and solubility experienced and optimise its lifespan. In this review we identify these factors and consider the detrimental effects of sorption and solubility on denture base acrylic materials.

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