Bibliografie tematiche / Solar adsorption

Letteratura scientifica selezionata sul tema "Solar adsorption"

Autore: Grafiati
Pubblicato: 24 agosto 2024

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Articoli di riviste sul tema "Solar adsorption"

1

Nu, Soe Soe, e Dr Mi Sandar Mon. "Analysis of Adsorption Time for Solar Adsorption Refrigeration System". International Journal of Trend in Scientific Research and Development Volume-2, Issue-6 (31 ottobre 2018): 61–63. http://dx.doi.org/10.31142/ijtsrd18349.

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2

Song, Xiang Bo, Xu Ji, Ming Li, Jie Qing Fan, Bin Luo, Xi Luo e Yun Feng Wang. "Investigation on Influence of Solar Radiation on Performance of Solar Adsorption Refrigeration System". Advanced Materials Research 953-954 (giugno 2014): 57–60. http://dx.doi.org/10.4028/www.scientific.net/amr.953-954.57.

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This article conducts the research on the relationship between the solar radiation and the adsorption bed temperature, the adsorption bed pressure and the system performance, and obtains that the solar radiation indirectly influences the system refrigeration performance through influencing the adsorption bed temperature and adsorption bed pressure. And in a certain range, the bigger solar radiation is, the higher adsorption bed temperature is, the system refrigeration efficiency is higher, the maximum refrigeration efficiency is 0.122.
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3

Kim, Tae-Young, Kyung-Hee Park, Jae-Wook Lee, Shin Han e Sung-Young Cho. "Adsorption Equilibrium and Kinetics ofGardenia BlueonTiO2Photoelectrode for Dye-Sensitized Solar Cells". International Journal of Photoenergy 2014 (2014): 1–7. http://dx.doi.org/10.1155/2014/429312.

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Nanostructured porous TiO2paste was deposited on the FTO conductive glass using squeeze printing technique in order to obtain a TiO2thin film with a thickness of 10 μm and an area of 4 cm2.Gardenia blue (GB)extracted fromGardeniajasminodeElliswas employed as the natural dye for a dye-sensitized solar cell (DSSC). Adsorption studies indicated that the maximum adsorption capacity of GB on the surface of TiO2thin film was approximately 417 mgGB/g TiO2photoelectrode. The commercial and natural dyes, N-719 andGB, respectively, were employed to measure the adsorption kinetic data, which were analyzed by pseudo-first-order and pseudo-second-order models. The energy conversion efficiency of the TiO2electrode with successive adsorptions ofGBdye was about 0.2%.
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4

Zhang, Hua, Xu Ji, Ming Li, Qiang Wang e Xiang Bo Song. "A Comparative Study on Solar Refrigeration Technology". Applied Mechanics and Materials 541-542 (marzo 2014): 887–91. http://dx.doi.org/10.4028/www.scientific.net/amm.541-542.887.

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This paper performed a comparative study on solar photovoltaic refrigeration technology and solar adsorption refrigeration technology. The experimental results showed that in sunny day, COP of the solar fin pipe adsorption refrigerator was 0.13, and was higher than 0.12, COP of the photovoltaic refrigerator. With the solar radiation enhancement within a certain range, the COP of solar adsorption refrigerator increased faster than COP of solar photovoltaic refrigerator. From the aspects of economy, with the same refrigerating capacity, the cost of the adsorption refrigerators was 30% higher than that of the photovoltaic refrigerators.
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Belyanovskaya, Elena, Grigoriy Pustovoy, Yana Sergiyenko, Kostyntyn Sukhyy, Oleksandr Yerоmin, Elena Prokopenko, Mikhailo Gubinskyi e Ján Kizek. "Performance of the Adsorptive Solar Refrigerators Based on Composite Adsobents ’Silica Gel – Sodium Sulphate’". Advances in Thermal Processes and Energy Transformation 2, n. 2 (2019): 19–23. http://dx.doi.org/10.54570/atpet2019/02/02/0019.

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The performance of adsorptive solar refrigerators based on composite adsorbents ‘silica gel - sodium sulphate’ is studied. An optimum composition of adsorbent ’silica gel – sodium sulphate’ is suggested to be of 20 % silica gel and 80 % sodium sulphate. The basic factors affected the net coefficient of energy performance of the adsorptive solar refrigerator were stated. Net coefficients of performance of solar adsorptive refrigerator based on composite ‘silica gel – sodium sulphate’ are stated to change from 0.25 to 0.34 during operating period. Utilization of the adsorption heat is suggested to warm the heat carrier which applied to heat adsorbent during regeneration.
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Hassan, Hassan Zohair. "Transient Analysis of a Solar Chimney Power Plant Integrated with a Solid-Sorption Cooling System for Combined Power and Chilled Water Production". Energies 15, n. 18 (16 settembre 2022): 6793. http://dx.doi.org/10.3390/en15186793.

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Solar radiation is a reliable energy source that can be used to produce power and cold. Converting solar energy into electricity is attainable through solar chimney power plants. Moreover, solar energy has been utilized to produce cold in adsorption cooling systems. In the adsorption cooling cycle, the adsorption bed releases heat into the environment during the bed cooling phases. This paper introduces a novel hybrid solar chimney power plant integrated with a solar-driven adsorption water chiller. The purpose of the presented system is to enhance the system’s utilization of solar energy by recovering the reactor’s released heat and reusing it to augment the output power. In comparison with conventional solar chimney power plants, the introduced system produces continuous power throughout the day. A mathematical model is developed to evaluate the system’s performance. This model expresses the conservation of energy and mass for every component in the system. The silica gel and water adsorption pair is used in the simulation of the water chiller. It has been found that 62.6% of the adsorption reactor driving heat can be recycled. Therefore, a turbine power increase of 3.22% is obtained with a solar-to-electricity conversion efficiency of 0.4%.
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Ji, A. Min, Tian Tian e Bo Ning Tang. "Study on Solar Energy for Pre-Cooling Technology of Fruit and Vegetable". Applied Mechanics and Materials 700 (dicembre 2014): 37–41. http://dx.doi.org/10.4028/www.scientific.net/amm.700.37.

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This paper discusses the importance of per-cooling vegetable and fruit, establishes a mathematical model of the solar adsorption refrigeration system collector bed. It applies activated carbon - methanol as working pairs, takes solar vacuum tube－water cooled collector bed for refrigerating, adsorption temperature and adsorption rate versus time are calculated , draw the corresponding curve figure. Analyses solar adsorption refrigeration system performance and puts forward the improvement direction.
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Mohammed, Mena Safaa, e Nibal Fadel Farman. "Solar adsorption cooling system operating by activated–carbon–ethanol bed". International Journal of Renewable Energy Development 13, n. 3 (28 marzo 2024): 430–47. http://dx.doi.org/10.61435/ijred.2024.60170.

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One efficient way to convert small thermally energized into effective cooling is through adsorption cooling technology, which increases energy efficiency and reduces environmental pollution. This study's primary goal is to hypothetically examine the thermal coefficient of performing the solar adsorptive refrigerator machine operated with an activating carbon/Ethanol operating dual. The impact of different operating situations and design factors on the machine's performance is inspected and evaluated. The present double-bed solar energy adsorptive-cooler unit is modeled by thermodynamic methodology. Then, it was analyzed to evaluate its effectiveness work under Baghdad climate conditions. For the current study, the two-bed solar adsorption cooling unit with 0.5 kW capacity input heat 11893 that operates at 5 °C for the evaporator and 45 °C for the condenser is presented. The Engineering-Equation-Solver (EES) simulation program was created and used to solve the modeling equations that predict the optimal cycle performance and evaluate the optimum reasonable values of the operation parameters of the proposed system. The pressure range for the refrigeration cycle is 2.408 kPa for the evaporation state and 23.14 kPa for the condensation state. The findings demonstrate that an optimum coefficient of performance (COP) is 0.702 at 95 °C, a 20% performance increase, which generates 39.4 of cooling water. It produced 1 kg of chilled water for 2.463 kg of activated carbon at a temperature of 5°C. The improved solar-powered adsorption systems and refrigeration technologies are appealing substitutes that can satisfy energy demands in addition to meeting needs for cooling, ice production, air conditioning, and refrigeration preservation and safeguarding of the environment with Iraq's climate conditions.
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Liang, Hai Bin, e Hui Zhong Zhao. "Experimental Study on Adsorption Water Tube from Atmosphere Using Solar Energy". Advanced Materials Research 694-697 (maggio 2013): 712–15. http://dx.doi.org/10.4028/www.scientific.net/amr.694-697.712.

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The solar adsorption water tube was put forward in this research paper, which producing water from atmosphere with solar energy. When the ambient temperature range is 30.7°C-41.6 °C and the solar transient radiation range is 284 W/m2-1007 W/m2, a solar adsorption water tube could produce 78ml water after adsorbed 10m3 air. The highest temperature of the adsorption bed can reach to 200°Cin the process of desorption.
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Kuri, J. L. W., A. G. Sangines e S. Riffat. "Solar adsorption refrigeration unit (SARU)". International Journal of Low-Carbon Technologies 2, n. 2 (1 aprile 2007): 178–94. http://dx.doi.org/10.1093/ijlct/2.2.178.

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Più fonti

Tesi sul tema "Solar adsorption"

1

Schurger, Uwe. "Investigation into solar powered adsorption cooling systems : adsorption technology and system analysis". Thesis, De Montfort University, 2007. http://hdl.handle.net/2086/4122.

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Due to the fact that the worldwide energy consumption caused by cooling devices in buildings has been increasing steadily and also the fact that the pressure has been rising to provide this cooling energy with environmentally friendly technology, solar powe.re~ DEC-systems (Desiccative and Evaporative Cooling) have begun capturing increasing interest over the past few years. , However, up to now little experience has been gained in the operation of these systems and thus currently little information is available about the performance, the efficiency, the control strategy and the best component choice. This lack of knowledge has resulted in a low rate of acceptance of, this technology so far. The studies presented in this thesis serve as a contribution to the advancement of DEC technology by providing fundamental knowledge about the operation and attainable performance of these systems. A comprehensive study of desiccant wheels was undertaken which provides detailed information about the operation and the achievable dehumidification performance of this component. A detailed simulation model for desiccant wheels was developed and verified with measured data from a desiccant wheel test plant. Additionally, two commercially used DEC-systems (one in a public library in Spain and the other in a plastics processing factory building in Germany) were monitored for the purposes of evaluating the performance of these systems and resolving existing problems in their operation and control strategies. In spite of the generally positive validation of the planned and expected cooling performances in both cases, the monitoring also showed that there are considerable possibilities· for improvement, especially with the regulation of the system.
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Papakokkinos, Giorgos. "Computational modeling of adsorption packed bed reactors and solar-driven adsorption cooling systems". Doctoral thesis, Universitat Politècnica de Catalunya, 2021. http://hdl.handle.net/10803/672099.

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Environmental concerns regarding climate change and ozone depletion urge for a paradigm shift in the cooling production. The cooling demand exhibits an alarmingly increasing trend, thus its satisfaction in a sustainable manner is imperative. Adsorption cooling systems (ACSs) are a potential candidate for a sustainable future of cooling production, since they can utilize solar energy or waste heat, as well as they can employ substances with zero ozone depletion and global warming potential. The objective of this thesis is to contribute to the investigation and improvement of ACSs, through the development of two computational models - which approach ACSs from different perspectives - and their respective utilization for the conduction of related numerical studies. The first research direction focuses on the design of the adsorption reactor, the most vital component of ACSs. Its geometrical configuration is determinant for the system performance. The reactor design is a crucial task since it creates a dichotomy between the two performance indicators - the Specific Cooling Power (SCP) and the Coefficient of Performance (COP). Individual optimizations based on the SCP and the COP would result in completely opposite geometrical configurations. A computational model for the simulation of adsorption packed bed reactors was developed, capable of simulating any potential reactor geometry. A multi-timestep approach is adopted, resulting in a drastic reduction of the computational cost of the simulations. Verification and validation assessments were performed in order to evaluate the reliability of the model. Two major studies were conducted within this research direction. The first aspires to provide a comparison between five reactor geometries, motivated by the lack of comparability across different studies in the literature. Thirteen cases of each geometry are simulated, by varying the fin thickness, fin length and solid volume fraction. The second study pertains to a thorough investigation of a geometry that remained underexplored hitherto - the hexagonal honeycomb adsorption reactor. A parametric study is conducted with respect to the three dimensions that define the geometry, as well as for various operating conditions. The second research direction is dedicated to the investigation of adsorption cooling systems, and in particular, to their integration within a wider thermal system, a solar-cooled building. Such integration is not straight-forward due to thermal inertia effects and the inherent cyclic operation of ACSs, as well as due to the dependence on an intermittent source and an auxiliary unit, with a clear objective to prioritize solar energy. A numerical model was developed using 1-d models for the adsorption reactors and 0-d models for the evaporator and condenser. The model is validated against experimental results found in the literature. The model is coupled to the generic optimization tool GenOpt, thus allowing the conduction of optimization studies. The ACS model is then coupled to solar collectors and thermal storage models, as well as to a building model. The latter was previously developed in the CTTC laboratory. This coupling results in a comprehensive simulation tool for adsorption-based solar-cooled buildings. A case study for a solar-cooled office is considered, with the objective to investigate the potential of satisfying its cooling demand using solar energy. A control strategy is proposed based on variable cycle duration, using optimized values for the instantaneous operating conditions. The variable cycle duration approach allows to satisfy the cooling demand using significantly less solar collectors or less auxiliary energy input. The potential carbon dioxide emissions avoidance is calculated between 28.1-90.7% with respect to four scenarios of electricity-driven systems of different performance and carbon emission intensity.
La preocupació mediambiental sobre el canvi climàtic i l'esgotament d'ozó exigeix un canvi de paradigma en la producció de fred. La demanda de refredament mostra una tendència alarmant creixent, així és imperatiu satisfer-la de forma sostenible. Els sistemes de refredament per adsorció (ACS) són un candidat per a un futur sostenible de la producció de fred, ja que poden utilitzar energia solar o calor residual, emprant substàncies amb zero potencial d'esgotament d'ozó i d'escalfament global. L'objectiu d'aquesta tesi és contribuir a la investigació i millora dels ACS, mitjançant el desenvolupament de dos models computacionals - que aborden els ACS des de diferents perspectives - i la seva utilització per a la realització d'estudis numèrics. La primera línia d'investigació se centra en el disseny del reactor d'adsorció, el component més important dels ACS. La seva configuració geomètrica és determinant pel rendiment de sistema. El seu disseny és una tasca crucial, ja que crea una dicotomia entre la potència específica de refrigeració (SCP) i el coeficient de rendiment (COP). Les optimitzacions individuals basades en el SCP i el COP resultarien a configuracions geomètriques completament oposades. S'ha desenvolupat un model computacional per a la simulació de reactors d'adsorció tipus "packed bed", capaç de simular reactors de qualsevol geometria. S'adopta una estratègia multi-timestep, que permet una dràstica reducció del cost computacional de les simulacions. La fiabilitat del model es va avaluar a través de processos de verificació i validació. Dins d'aquesta línia de recerca es van realitzar dos estudis principals. El primer aspira a proporcionar una comparació entre cinc geometries de reactors, motivat per la falta de comparabilitat entre diferents estudis en la literatura. Es simulen tretze casos de cada geometria, variant el gruix de les aletes, la seva longitud i la fracció de volum de sòlid. El segon estudi presenta la investigació d'una geometria sub-explorada previament, el reactor d'adsorció de honeycomb hexagonal. Es realitza un estudi paramètric pel que fa a les tres dimensions que defineixen la geometria, així com per a diverses condicions de funcionament. La segona línia de recerca es dedica a la investigació dels ACS. i en particular, a la seva integració dins d'un sistema tèrmic més ampli, un edifici refredat per energia solar. Aquesta integració no és senzilla a causa de la inèrcia tèrmica i a el funcionament cíclic inherent dels ACS, així com a la dependència d'una font intermitent i d'un sistema auxiliar, amb l'objectiu de prioritzar l'energia solar. S'ha desenvolupat un model numèric utilitzant models 1-d pels reactors i models 0-d per l'evaporador i el condensador. El model es va validar amb resultats experimentals trobats en la literatura. El model es va acoblar amb l'eina d'optimització genèrica GenOpt, permetent així estudis d'optimització. El model ACS es va acoblar amb models de col·lectors solars, emmagatzematge tèrmic i amb un model d'edifici. Aquest últim va ser desenvolupat prèviament al CTTC. Aquest acoblament resulta a una eina de simulació integral per a edificis refredats per energia solar utilitzant adsorció. Es considera un cas d'estudi per a una oficina refredada per energia solar, amb l'objectiu d'investigar el potencial de satisfer la seva demanda de fred utilitzant energia solar. Es proposa una estratègia de control basada en la duració variable del cicle, utilitzant valors optimitzats per a les condicions instantànies. La durada variable d'el cicle permet satisfer la demanda utilitzant una quantitat significativament menor de col·lectors solars o un menor aportació d'energia auxiliar. Les emissions de CO2 evitades es calculen entre 28.1-90.7% respecte a quatre escenaris de sistemes elèctrics de diferent rendiment i intensitat d'emissions de carboni.
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3

Merino, Jose Carlos Alvarez, e Kazuo Hatakeyama. "Technology surveillance of the solar refrigeration by absorption/adsorption". Institute of Electrical and Electronics Engineers Inc, 2016. http://hdl.handle.net/10757/622310.

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PICMET 2016 - Portland International Conference on Management of Engineering and Technology: Technology Management For Social Innovation, Proceedings4 January 2017, Article number 7806767, Pages 1976-19822016 Portland International Conference on Management of Engineering and Technology, PICMET 2016; Honolulu; United States; 4 September 2016 through 8 September 2016; Category numberCFP16766-ART; Code 125891
In order to establish networks of cooperation looking for not to duplicate research and even to make use of existing research in a remote form, it is necessary to identify and classify (around the world) the researchers and laboratories, that are researching in the topic of solar refrigeration by absorption/adsorption. The methodology consists in: i) the technology's classification, ii) technological trajectory Identification, iii) a thematic bibliographic review, and iv) patent's analysis. In this way, with the previous determination of keywords, will be identified main authors and their respective institutions. With the same keywords, are determined the licensed patents (in certain span of time). In addition, the analysis of publications, patents, and commercial products give us an opportunity to establish comparisons between prototypes and tests (in several conditions). The larger results implicate the use of actor's network and the remote access to the data and tests, for a collaborative research, overcoming the lack of laboratory resource and accelerating the knowledge acquisition
Revisión por pares
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4

Sinha, Saket. "An energy efficient solar-assisted advanced adsorption chiller system". Thesis, University of Sydney, 2020. https://hdl.handle.net/2123/23401.

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The rise in living standards and the environmental challenges associated with fossil energy has attracted engineers and researchers to focus on energy use of buildings. Buildings consume 40% of world’s total energy consumption and air-conditioning alone consumes 15% of building’s total energy consumption. The integration of solar energy with adsorption cooling technology is an attractive area of research. The thesis develops a literature review of adsorption working pairs and different nanofluids used as cooling liquid in the adsorption chiller system. An advanced adsorption chiller system uses composites ‘salt inside porous matrix’ (CSPM) as adsorption material and multiwalled carbon nanotubes/graphene nanofluid (MWCNT/GNF) as cooling liquid. An adsorption chiller model used in TRNSYS simulation software compares temperature profiles of different components like solar collector, hot storage tank and an office space for conventional silica gel↔water and activated carbon fiber with barium chloride salt (ACF/BCS)↔ammonia adsorption chillers. The effect of MWCNT/GNF to improve performance of adsorption chiller is analysed. It is found that activated carbon fiber/nickel chloride salt (ACF/NCS) and ACF/BCS can improve the coefficient of performance (COP) by 23.4% and 95.7%, respectively. The later part of the thesis develops a nonlinear model predictive control (NMPC) model for (ACF/BCS)↔ammonia adsorption chiller system. The cumulative fossil fuel consumption for an year reduces by 61.3% using the NMPC approach for (ACF/BCS)↔ammonia adsorption chiller plant. The potential benefits of the application of NMPC in optimal management of solar energy, improving energy-efficiency and thermal comfort for an office space are highlighted in this study.
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5

You, Ying 1962. "A solar adsorption refrigeration system operating at near atmospheric pressure". Monash University, Gippsland School of Engineering, 2001. http://arrow.monash.edu.au/hdl/1959.1/8740.

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6

Escobedo, João Francisco. "Refrigeração com uso de energia solar". Universidade de São Paulo, 1987. http://www.teses.usp.br/teses/disponiveis/54/54132/tde-28052009-094024/.

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Uma simulação numérica do ciclo de refrigeração a adsorção é realizada para os pares zeólita-água e carvão ativo AC-35 metanol, justificando a escolha do par bem como do sistema de captação a serem utilizados no protótipo. O protótipo construído compreende um concentrador cilíndrico-parabólico com rastreamento solar, um tubo de calor e uma unidade frigorífica (com zeólita-água). Aspectos tecnológicos como válvulas, soldas e carregamento do par na máquina são analisados. Os resultados dos testes de desempenho são apresentados, discutidos e comparados com a literatura. Uma análise de custos é feita. Paralelamente, construímos termo pilhas pelo método da evaporação. Estas termopilhas foram utilizadas na construção do piranômetro e do pireliômetro. Os instrumentos são caracterizados em termos de sensibilidade, constante de tempo, linearidade, efeitos de temperatura e convecção natural. Os resultados desta caracterização são discutidos e comparados com um modelo fabricado pela Eppley. Finalmente, no apêndice I, testamos o desempenho de um coletor plano utilizando no absorvedor o revestimento seletivo de óxido de alumínio recentemente desenvolvido no IFQSC. As melhores condições para obtenção do revestimento seletivo em placas de grande porte são estudadas.
A numerical simulation of the adsorption refrigeration cycle was made for zeolite/water and activated carbon(AC-35)/ methanol pairs, to select the pair and the solar collector in the prototype. The fabricated prototype consists of a cylindrical paraolic concentrator with solar trackins, a heat pipe and the refrigeration unit (with the zeolite/water pair). The technical aspects of values, welds and out-gassing are analyzed. The results of the performance tests are presented, discussed and compared with the literature. An analysis of costs is made. In parallel thermopiles were constructed using the evaporation method. These thermopiles were used in the construction of the piranometer and the pirheliometer. The instruments were characterized in terms of: sensitivity, stability with time, linearity, effects of temperature and natural convenction. The results of this characterization are discussed and compared with a model made by Eppley. Finally, in Apendix I, we tested the performance of a flat plate collector using a selective coating of aluminium oxide (developed in IFQSC) as absorber. The Best conditions for obtaining the seletive coating on big size plates are discussed.
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7

Tabassum, Alim Abid. "Solar refrigeration : evaluation of technical options and design of a solar-generator-adsorber for a novel adsorption refrigerator". Thesis, Cranfield University, 1989. http://dspace.lib.cranfield.ac.uk/handle/1826/4213.

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Various technical options for developing a solar operated refrigerator have been discussed. Their suitability for being used as a vaccine store for the conditions specified by the World Health (EPI) Organization Expanded Programme on Immunization 4have been evaluated. A model to predict the performance of a photovoltaic refrigerator have been developed and used to identify factors which influence its performance. It was concluded that it can be more competitive in areas where insolation is high and sunshine hours are long. It has been proposed that ice-lined refrigerators, which would run during the day, may be more economical and eliminate the need for a battery storage. The option of operating an 'Electrolux' absorption refrigerator with evacuated tube heat pipe collectors has been assessed. It was concluded that the operation was not possible without a major re-design of the commercially available models. However, it was proposed that coordination of the EPI with other development programmes may be useful. It is proposed to build, with this coordinated effort, biogas plants. Biogas can then fuel the modified burner of the kerosene fueled absorption refrigerators. This may well prove to be a cheaper option. Characterization of various adsorption pairs has been done using the experimental rig developed for the purpose. The influence of various properties of adsorption pairs on the performance of an adsorption refrigeration cycle has been studied. It was observed that the generation temperature in an adsorption refrigeration cycle (or a bivariant absorption system), for a specified operating regime, was only a function of the refrigerant. A relationship between the refrigerant properties and the generating temperature for specified operating conditions was developed. Using this relationship it was established that ammonia and methanol cannot be generated at temperatures below 1200C for WHO/EPI specified operating conditions, if the condenser was air-cooled. A novel idea of direct absorption of solar radiation into the activated carbon bed is put forward to combat the temperature differential of 214°C, in a conventional design of SGA, between the carbon and the metal container. The idea was practically implemented by replacing the top of the metal box by transparent glass sheet. The seal between the metal container and glass imposed practical difficulties in that design but the tests proved that the idea had potential. A new tubular design of the SGA is proposed finally which is hoped to bring improvement to the performance of activated carbon adsorption refrigerators.
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8

Tabassum, Salim Abid. "Solar refrigeration: evaluation of technical options and design of a solar-generator-adsorber for a novel adsorption refrigerator". Thesis, Cranfield University, 1989. http://hdl.handle.net/1826/4213.

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Abstract (sommario):
Various technical options for developing a solar operated refrigerator have been discussed. Their suitability for being used as a vaccine store for the conditions specified by the World Health (EPI) Organization Expanded Programme on Immunization 4have been evaluated. A model to predict the performance of a photovoltaic refrigerator have been developed and used to identify factors which influence its performance. It was concluded that it can be more competitive in areas where insolation is high and sunshine hours are long. It has been proposed that ice-lined refrigerators, which would run during the day, may be more economical and eliminate the need for a battery storage. The option of operating an 'Electrolux' absorption refrigerator with evacuated tube heat pipe collectors has been assessed. It was concluded that the operation was not possible without a major re-design of the commercially available models. However, it was proposed that coordination of the EPI with other development programmes may be useful. It is proposed to build, with this coordinated effort, biogas plants. Biogas can then fuel the modified burner of the kerosene fueled absorption refrigerators. This may well prove to be a cheaper option. Characterization of various adsorption pairs has been done using the experimental rig developed for the purpose. The influence of various properties of adsorption pairs on the performance of an adsorption refrigeration cycle has been studied. It was observed that the generation temperature in an adsorption refrigeration cycle (or a bivariant absorption system), for a specified operating regime, was only a function of the refrigerant. A relationship between the refrigerant properties and the generating temperature for specified operating conditions was developed. Using this relationship it was established that ammonia and methanol cannot be generated at temperatures below 1200C for WHO/EPI specified operating conditions, if the condenser was air-cooled. A novel idea of direct absorption of solar radiation into the activated carbon bed is put forward to combat the temperature differential of 214°C, in a conventional design of SGA, between the carbon and the metal container. The idea was practically implemented by replacing the top of the metal box by transparent glass sheet. The seal between the metal container and glass imposed practical difficulties in that design but the tests proved that the idea had potential. A new tubular design of the SGA is proposed finally which is hoped to bring improvement to the performance of activated carbon adsorption refrigerators.
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9

AraÃjo, Maria Elieneide. "ValidaÃÃo experimental de um resfriador de Ãgua operando em ciclo de adsorÃÃo com aquecimento solar indireto". Universidade Federal do CearÃ, 2009. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=3400.

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CoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel Superior
Apresenta a validaÃÃo experimental de um novo refrigerador solar por adsorÃÃo com aquecimento indireto. Os componentes do refrigerador sÃo: adsorvedor, condensador, evaporador e coletor solar. A escolha do par adsorbato / adsorvente, Ãgua e sÃlica gel tipo RD, respectivamente, levou em consideraÃÃo as temperaturas alcanÃadas pelos coletores e disponÃveis para a dessorÃÃo do fluÃdo refrigerante (Ãgua) das cavidades do material adsorvente (sÃlido poroso). Devido à coexistÃncia das etapas de aquecimento e resfriamento no adsorvedor, foi definida uma geometria para este componente capaz de permitir uma melhor dissipaÃÃo de calor no material adsorvente na fase de resfriamento, e a conservaÃÃo de energia tÃrmica durante a fase de aquecimento. Os resultados experimentais comprovaram o funcionamento do refrigerador, visto que foram atingidas temperaturas de 140ÂC na entrada do adsorvedor, 80ÂC no leito adsortivo e de 4,4ÂC no evaporador, possibilitando sua aplicaÃÃo em sistemas de condicionamento de ar
This work presents the experimental validation of a new adsorption solar refrigeration with indirect heating. The components of the refrigerator are: an adsorber, a condenser, an evaporator, and a solar collector. The choice of the adsorbate / adsorbent pair, water and silica gel type RD, respectively, took into consideration the temperatures reached by the solar collectors and available for the desorption of the refrigerant fluid (water) from the cavities of the adsorbent material (a porous solid). Due to the co-existence of the heating and cooling phases in the adsorber, a specific geometry for this component was defined so as to allow a good heat dissipation in the adsorbent material in the cooling phase, and the conservation of thermal energy in the heating phase. The experimental results validate the operation of the refrigerator, as temperature valves of 140ÂC at the inlet of the adsorber, of 80ÂC in the adsorber bed, and of 4,4ÂC in the evaporator were reached, allowing its application in air conditioning systems
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Demirocak, Emre Dervis. "Thermodynamic And Economic Analysis Of A Solar Thermal Powered Adsorption Cooling System". Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12610110/index.pdf.

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In this thesis, yearly performance of the solar adsorption cooling system which is proposed to be installed to a residential building in Antalya is theoretically investigated in detail. Firstly, thermodynamic designs of the adsorption cooling cycle for three different types of cycles which are intermittent, heat recovery and heat &
mass recovery cycles are presented. Secondly, adsorption characteristics of three adsorbent/adsorbate pairs which are zeolite-water, silica gel-water and activated carbon-methanol are given. Following this, load side (i.e., building) of the system is designed and parameters that should be considered in building design are presented. Then, solar-thermal cooling system design methodology with an emphasis on solar fraction is presented. In addition, system parameters effecting the performance of the adsorption cooling system are analyzed and results are presented. Finally, economic analysis is done in order to understand the economic feasibility of the solar-thermal cooling systems compared to conventional cooling systems. TRNSYS is used for the yearly simulations and an integrated model of the overall system is developed in TRNSYS. Since energy consumption and performance investigations of environment-dependent systems such as building HVAC, refrigeration systems and solar collectors usually require weather information, typical meteorological year (TMY) data for Antalya is also generated in order to be used in the analysis of the system parameters.
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Più fonti

Libri sul tema "Solar adsorption"

1

Gong, Feng. Solar/multifuel adsorption refrigeration. [s.l.]: typescript, 1993.

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It's the sun, not your SUV: CO₂ won't destroy the Earth. South Bend, Ind: St. Augustine's Press, 2008.

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Capitoli di libri sul tema "Solar adsorption"

1

Kaushik, S. C., S. K. Tyagi e V. Baiju. "Vapour Adsorption Cooling Systems". In Solar Cooling, 203–41. Cham: Springer International Publishing, 2024. http://dx.doi.org/10.1007/978-3-031-42410-6_7.

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2

Muttakin, Mahbubul, Kazuhide Ito e Bidyut Baran Saha. "Solar Thermal-Powered Adsorption Chiller". In Solar Energy, 117–46. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-15-0675-8_8.

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Ülkü, S. "Solar Adsorption Heat Pumps". In Solar Energy Utilization, 424–35. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3631-7_20.

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Mohammed, Ramy H., e Ahmed A. Askalany. "Productivity Improvements of Adsorption Desalination Systems". In Solar Desalination Technology, 325–57. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-6887-5_15.

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Jrad, Amal Bel Haj, Abdelaziz Zagnani e Abdallah Mhimid. "Solar Adsorption Cooling System Study". In Recent Advances in Environmental Science from the Euro-Mediterranean and Surrounding Regions, 1523–26. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-70548-4_443.

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Sangwan, Satish, e Prodyut R. Chakraborty. "Thermodynamic Analysis of Activated Carbon–Ethanol and Zeolite–Water Based Adsorption Cooling Systems". In Solar Energy, 179–204. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-15-0675-8_10.

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Yang, Wansheng, Shuli Liu, Xiaoqiang Zhai, Yin Bi, Zhangyuan Wang e Xudong Zhao. "Solar Desiccant (Absorption/Adsorption) Cooling/Dehumidification Technologies". In Advanced Energy Efficiency Technologies for Solar Heating, Cooling and Power Generation, 211–86. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-17283-1_7.

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Raj, Priyemant, Vishal kumar, Ajay Vashist, Meeta Sharma e Anoop Kumar Shukla. "Comprehensive Study on Solar Adsorption Cooling System". In Lecture Notes in Mechanical Engineering, 217–36. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-1894-2_19.

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Ammor, L., H. El Ghitani, S. Savary e S. Martinuzzi. "Improvement of Polycrystalline Silicon Cells by Adsorption of Hydrogen". In Seventh E.C. Photovoltaic Solar Energy Conference, 860–64. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3817-5_152.

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Pichat, P. "Photocatalysis: Heterogeneous Regime. Catalysts, Adsorption and New Techniques". In Photochemical Conversion and Storage of Solar Energy, 277–93. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3396-8_16.

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Atti di convegni sul tema "Solar adsorption"

1

Vas, John Paul, Rudolf Charles D’Souza, Ravikantha Prabhu e Sharun Mendonca. "Adsorption based solar refrigeration system". In EMERGING TRENDS IN MECHANICAL ENGINEERING 2018. Author(s), 2019. http://dx.doi.org/10.1063/1.5092917.

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Raymand, David, Tomas Edvinsson, Daniel Spångberg, Adri van Duin e Kersti Hermansson. "Water adsorption beyond monolayer coverage on ZnO surfaces and nanoclusters". In Solar Energy + Applications, a cura di Gunnar Westin. SPIE, 2008. http://dx.doi.org/10.1117/12.795337.

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Abdullah, M. O., e S. L. Leo. "Feasibility Study of Solar Adsorption Technologies for Automobile Air-Conditioning". In ASME 2005 International Solar Energy Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/isec2005-76064.

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An adsorption system driven by solar heat or waste heat can help to eliminate the use of ozone depletion substances, such as chlorofluorocarbons (CFCs) and hydro-chlorofluorocarbons (HCFCs). In recent years, adsorption system has witnessed an increasing interest in many fields due to the fact that this system is quiet, long lasting, cheap to maintain and environmentally benign. Although adsorption system is not commonly used for automobile air conditioning, adsorption-cooled mini-refrigerators have been marketed for recreational transports (motor homes, boats, etc). Hence, there exists a need for a creative design and innovation to allow adsorption technology to be practical for air conditioning in automobile. The objective of this paper is to present a comprehensive review on the past efforts in the field of solar adsorption refrigeration systems and also the feasibility study of this technology for automobile airconditioning purpose. It is a particularly an attractive application for solar energy because of the near coincidence of peak cooling loads with the available of solar power.
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Anyanwu, Emmanuel E., e Nnamdi V. Ogueke. "Economic Evaluation of a Solid Adsorption Solar Refrigerator". In ASME 2006 International Solar Energy Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/isec2006-99052.

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A procedure is developed for assessing the economic viability of a solid adsorption solar refrigerator in terms of its life cycle saving over a conventional vapour compression refrigerator. The life cycle saving is expressed in generalized form. Economic factors considered include property tax rate, inflation rate, banks interest rate and yearly rate of increase of energy and maintenance cost. Results obtained indicate that the first cost of the solid adsorption solar refrigerator is usually quite high. However over time, the investment in it will be justified, especially in regions with high insolation level without grid connected electricity.
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Hamed, Ahmed M., Walaa R. Abd El Ramadan e S. H. El-Eman. "Study on the Performance of a Fluidized Air Dehumidifier". In ASME 2005 International Solar Energy Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/isec2005-76202.

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Transient adsorption/desorption characteristics of solid desiccant particles in fluidized bed have been presented. The system operates in batch mode and the atmospheric air with controlled inlet humidity and temperature is dehumidified by the applied desiccant. Also, heated air is used for regeneration purposes. A simplified analytical solution, with isothermal adsorption assumption, is demonstrated. In the experimental study, spherical particles of silica gel about 3 mm in diameter are used as the working desiccant in the fluidized bed. The experimental system is equipped with the necessary control valves to facilitate operation in adsorption and desorption modes, respectively. To control the humidity of inlet air, a humidifier is designed and fitted in a proper location in the system. Also, the system is well instrumented to measure the inlet and outlet air parameters as well as bed temperatures during the operation modes. Transient values of the mass of adsorbed water in the bed, rate of adsorption and water content in silica gel particles are evaluated from the experimental measurements. Also, numerical values of the volumetric mass transfer coefficient are plotted and discussed for different operating conditions. Model output, which shows the dependence of the dimensionless value of water content in the bed [(w*i − w)/(w*i − wo)] on the dimensionless time, is compared with the experimental results. Good agreement is found at the first period of adsorption, when the adsorption is nearly isothermal. Successive increase in bed temperature, due to the heat of adsorption, results in increase in discrepancy between the model and the experimental data. Accordingly, the isothermal model could be applied with reasonable degree of reality for systems with shorter adsorption/desorption cycles. The effect of air inlet humidity on the system operation has been highlighted. The drop in air humidity is highly affected by its inlet value. It is found that, the maximum decrease in air humidity occurs at the beginning of adsorption for the different inlet values. Also, the rate of water vapor adsorption increases with the increase in the inlet humidity.
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Trujeque Bolio, Jessica G., e Julio Cesar Ramirez Hernandez. "Solar Adsorption Refrigerator With Work Pair Economical". In ASME 2011 5th International Conference on Energy Sustainability. ASMEDC, 2011. http://dx.doi.org/10.1115/es2011-54130.

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Anthropogenic production of cold is necessary for the preservation of the food industry, industrial processes, ice making, refrigeration and domestic conditioning of fixed and mobile spaces, emphasizing the importance in the health sector for the preservation of vaccines, biological and vital organs. Al ready exist technology who use power supply to produce cold, causing global warming as part of the side effect of CO2 from burning fossil fuel for power plants. Currently being researched and developed alternative technology that who operates with solar energy and requires no power supply. The market is looking for competitive cooling technologies operating systems generally, to raise the development of a solar refrigerator design for hot humid climate in Mexico, for the most critical environmental conditions of sunlight in a highly demanding cold technology.
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El Fadar, A., A. Haddi, M. Becherif e J. Jay. "Automation of a solar adsorption refrigeration system". In 2013 International Renewable and Sustainable Energy Conference (IRSEC). IEEE, 2013. http://dx.doi.org/10.1109/irsec.2013.6529722.

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Ribeiro, Celina Maria, Antonio Pralon Leite, Francisco Antonio Belo, Douglas Bressan Riffel, Belkacem Zeghmati e Mr Daniel Sarmento. "Air Conditioning System of 20 kW Based on Solar-Gas Adsorption". In ISES Solar World Congress 2011. Freiburg, Germany: International Solar Energy Society, 2011. http://dx.doi.org/10.18086/swc.2011.20.22.

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Wayment-Steele, Hannah K., Lewis E. Johnson, Matthew C. Dixon e Malkiat S. Johal. "Characterization of N3 dye adsorption on TiO2using quartz-crystal microbalance with dissipation monitoring". In SPIE Solar Energy + Technology, a cura di Louay A. Eldada e Michael J. Heben. SPIE, 2013. http://dx.doi.org/10.1117/12.2023654.

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Anyanwu, Emmanuel E., e Nnamdi V. Ogueke. "Transient Analysis and Performance Prediction of a Solid Adsorption Solar Refrigerator". In ASME 2005 International Solar Energy Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/isec2005-76211.

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The transient analysis and performance prediction of a solid adsorption solar refrigerator, using activated carbon/methanol adsorbent/adsorbate pair are presented. The mathematical model is based on the thermodynamics of the adsorption process, heat transfer in the collector plate/tube arrangement, and heat and mass transfers within the adsorbent/adsorbate pair. Its numerical model developed from finite element transformation of the resulting equations computes the collector plate and tube temperatures to within 5°C. The condensate yield and coefficient of performance, COP were predicted to within 5% and 9%, respectively. The resulting evaporator water temperature was also predicted to within 4%. Thus the model is considered a useful design tool for the refrigerator to avoid costly experimentation.
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Rapporti di organizzazioni sul tema "Solar adsorption"

1

Hansen, Tim, Eric Ringler e William Chatterton. Demonstration of a Solar Thermal Combined Heating, Cooling and Hot Water System Utilizing an Adsorption Chiller for DoD Installations. Fort Belvoir, VA: Defense Technical Information Center, dicembre 2013. http://dx.doi.org/10.21236/ada608953.

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Farmer, J. SOLAR-POWERED AEROGEL-BASED ADSORPTIVE AIR CONDITIONING. Office of Scientific and Technical Information (OSTI), febbraio 2010. http://dx.doi.org/10.2172/1129983.

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