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Articoli di riviste sul tema "Solar adsorption"

Autore: Grafiati

Pubblicato: 24 agosto 2024

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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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5

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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6

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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8

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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9

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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10

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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11

Daßler, Ingo, e Walter Mittelbach. "Solar Cooling with Adsorption Chillers". Energy Procedia 30 (2012): 921–29. http://dx.doi.org/10.1016/j.egypro.2012.11.104.

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12

Mitra, S., K. Srinivasan, P. Kumar, S. S. Murthy e P. Dutta. "Solar Driven Adsorption Desalination System". Energy Procedia 49 (2014): 2261–69. http://dx.doi.org/10.1016/j.egypro.2014.03.239.

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13

Bawazir, Abdullah, e Daniel Friedrich. "Evaluation and Design of Large-Scale Solar Adsorption Cooling Systems Based on Energetic, Economic and Environmental Performance". Energies 15, n. 6 (15 marzo 2022): 2149. http://dx.doi.org/10.3390/en15062149.

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In hot and dry regions such as the Gulf Cooperation Council (GCC) countries, the cooling demand is often responsible for more than 70% of electricity consumption, which places a massive strain on the electricity grid and leads to significant emissions. Solar thermal driven Silica-Gel/Water adsorption chillers, used for space cooling, could provide low carbon emission cooling and reduce the reliance on grid electricity. However, a meticulous design is required to make this both economically and environmentally beneficial. This paper aims to evaluate the solar thermal adsorption chiller performance based on large-scale cooling demand through a TRNSYS simulation for 1 year of operation. The proposed system consists of two main parts: first, the solar loop with evacuated tube solar collectors; and second, the adsorption cooling system with a silica-gel/water adsorption chiller. A neighbourhood of 80 typical 197 m2 villas in Riyadh, the capital city of the Kingdom of Saudi Arabia (KSA), was taken as a case study. The solar adsorption cycle’s performance has been compared to the conventional vapour compression cycle in terms of energy, economic and environmental performance. In addition, a parametric study has been performed for the main design parameters. Results reveal that the system can reach a solar fraction of 96% with solar collector area of 5500 m2 and a storage tank volume between 350 and 400 m3. Furthermore, the annual energy cost can be reduced by 74% for the solar adsorption system compared to the conventional vapour compression cycle. Meanwhile, the CO2 saving percentage for the solar adsorption cycle was approximately 75% compared to the conventional vapour compression cycle. Carefully designed solar thermal cooling systems can reduce greenhouse gas emissions while covering a large scale of cooling demands. This can reduce the strain on the electricity grid as well as greenhouse gas emissions.

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14

Li, M., R. Z. Wang, F. Yun, F. Shi, L. L. Wang e H. L. Luo. "An Effective Flat Plate Solar Heating and Cooling Hybrid System". Adsorption Science & Technology 21, n. 5 (giugno 2003): 487–99. http://dx.doi.org/10.1260/026361703769645816.

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Based on the achievements of solar solid adsorption refrigeration research, a new hybrid heating and cooling system, related to the solar water heater technique, has been proposed. The conversion and utilization of solar energy for cooling and heating are also analyzed. Experiments on a prototype have shown that both the available (residual) and adsorption heats of the adsorbent bed can be recovered efficiently and simply. The results of some simulations of this new flat plate under real solar radiation are given, as well as comparisons with our previous research work. The successful design and assessment of this new flat plate hybrid system should accelerate the practical application of solid adsorption refrigeration driven by solar energy.

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15

Bujok, Tomasz, Marcin Sowa, Piotr Boruta, Łukasz Mika, Karol Sztekler e Patryk Robert Chaja. "Possibilities of Integrating Adsorption Chiller with Solar Collectors for Polish Climate Zone". Energies 15, n. 17 (26 agosto 2022): 6233. http://dx.doi.org/10.3390/en15176233.

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Solar-powered adsorption chillers are a particularly interesting alternative to energy-intensive conventional refrigeration systems. Integration of the adsorption chiller with solar collectors is a very promising concept since the increase in solar radiation coincides with the increased demand for cooling. Such a solution is very economical and environmentally friendly. It also fits in with current trends related to energy policy and sustainable development. The article presents the results of tests conducted for a two-bed adsorption chiller integrated with solar collectors. The tests were performed on selected days of the summer period (July and August) at the KEZO Research Centre PAS in Jablonna (Poland). Based on the results obtained, the performance parameters of the adsorption chiller were determined, and the problems associated with the integration of all components of the system were identified and discussed. The values of the determined Coefficient of Performance (COP) and cooling capacity for the tested adsorption chiller are, depending on the day on which the tests were conducted, from 0.531 to 0.692 and from 5.16 kW to 8.71 kW, respectively. Analysis of the test results made it possible to formulate conclusions related to the design of integrated systems of adsorption chillers with solar collectors.

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16

Liu, X., e C. S. B. Fitzpatrick. "Removal of humic substances using solar irradiation followed by granular activated carbon adsorption". Water Supply 10, n. 1 (1 marzo 2010): 15–22. http://dx.doi.org/10.2166/ws.2010.003.

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This study proposed a new method using freely available sunlight and granular activated carbon (GAC) adsorption for enhanced removal of humic substances (HS). Experiments were carried out under natural sunlight conditions in winter and summer. A parabolic solar collector (PC) was applied to concentrate solar energy. HS were characterized by UV254 absorbance, dissolved organic carbon (DOC) concentration and molecular weight (MW). As a result of solar irradiation, decreases of DOC up to 14% in winter and 58% in summer were observed. A comparison of adsorption isotherms and chromatograms of the irradiated and non-irradiated HS confirmed that smaller molecules formed during solar irradiation were preferentially adsorbed by GAC. A dramatic MW change upon solar irradiation was observed in HS irradiation in PC in summer experiment and almost no UV254 detected components were remaining in solution after adsorption (GAC dose 400 mg/L), as measured with high performance size exclusion chromatography (HPSEC). The combined solar irradiation-GAC adsorption method proved to be effective in enhancing HS removal by GAC with no additional energy and chemicals consumption.

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17

Ali, Mukhlis. "Pemanfaatan Energi Surya untuk Sistem Refrigerasi Berbasis Siklus Adsorpsi". Jurnal Permadi: Perancangan, Manufaktur, Material dan Energi 2, n. 1 (31 gennaio 2020): 22–33. http://dx.doi.org/10.52005/permadi.v2i1.29.

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Application of solar adsorption refrigeration systems has developed significantly since 1980’s. Although it has some advantages like noiseless, non-corrosive and environment friendly operation (because solar energy is one of green and renewable energy), but until now the application still cannot compete with the traditional vapor compression refrigeration systems. Fortunately, due to the increasing of awareness about ozone depletion and global warming, green technology including solar adsorption refrigeration systems still becomes priority research is developed by some country. Recent research in application of solar adsorption refrigeration systems not only focus in how to increase the coefficient of performance (COP) like the use of various collectors or working pairs but also how to implement the systems so that suitable with the location that it will be applied. Nowadays, application of solar adsorption refrigeration systems mostly varies into 3 categories: ice maker, cool chamber and humanitarian aid. And the application’s usage usually implement in remote area that far from grid electricity.

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18

Liu, Yan Ling, e Xue Zeng Shi. "Performance Study of a Solar Adsorption Refrigeration System". Advanced Materials Research 860-863 (dicembre 2013): 223–29. http://dx.doi.org/10.4028/www.scientific.net/amr.860-863.223.

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This paper presents the simulation of a solar-powered continuous adsorption air-conditioning system with the working pair of silica gel and water. In order to make the adsorption system more suitable to use solar energy to supply cooling continuously during daytime, a new adsorption system without refrigerant valves is being developed in SJTU recently. By using this system, the problem such as pressure drop along refrigerant circuit can be resolved. The frequent switches of refrigerant valves can also be omitted. The daytime long simulation results (ranging from 6:00 to 18:00) demonstrate that the solar-powered adsorption system can supply a fairly steady cooling output all the time. Based on the results, parametric study is also undertaken to optimize the design.

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Muhammad, NY, MN Mohtar, MM Ramli, S. Shafie, S. Shaban e Y. Yusof. "Enhancement of Dye Sensitized Solar Cell by Adsorption of Graphene Quantum Dots". International Journal of Materials, Mechanics and Manufacturing 8, n. 3 (giugno 2020): 126–30. http://dx.doi.org/10.18178/ijmmm.2020.8.3.494.

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Basrawi, F., K. Habib, H. Ibrahim e G. C. Lee. "A Study on the Effect of Solar Fraction on the Environmental Performance of Solar Air-Conditioning by an Adsorption Chiller". Global Journal of Energy Technology Research Updates 2, n. 1 (1 aprile 2015): 19–24. http://dx.doi.org/10.15377/2409-5818.2015.02.01.3.

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Solar air-conditioning (AC) is a sustainable air-conditioning system but a back-up heater is needed because a solar AC has intermittent output. This study presents the effect of ratio of heat delivered by solar to the total heat delivered to an adsorption chiller (solar fraction) on the environmental performance of a solar AC system. This AC system need covers cooling demand for an office building in Malaysia. Cooling demand of the building was simulated using well-known building energy analysis software, Equest. Flat-plate collectors and an adsorption chiller were the main component of the solar AC system. Flat-plate collecters were simulated using another software, Watsun, and the adsorption chiller was based on the author simulation model that is comparable with other studies. Environmental performance was analyzed by emission ratio of a boiler and power plants. Solar fraction of 0.33, 0.74 and 0.98 were studied. It was found that solar AC by an adsorption chiller can cover the cooling demand of the office building throughout the year. It was also found that a gas fired boiler is a better auxiliary heater than an electric heater because of the direct conversion of heat from fuel. Less emissions is emited at higher SF compared to conventional AC for all cases of back-up heater. A solar AC must has solar fraction higher than 74% to ensure it emits less emissions than a conventional AC system.

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21

Grenier, Ph, J. J. Guilleminot, F. Meunier e M. Pons. "Solar Powered Solid Adsorption Cold Store". Journal of Solar Energy Engineering 110, n. 3 (1 agosto 1988): 192–97. http://dx.doi.org/10.1115/1.3268256.

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Experimental results obtained on a 12 m3 solar-powered solid-adsorption cold store are presented. These results are compared to the predictions of a simplified model. On the basis of this model, performance of a similar installation under various conditions (location, orientation) and other technological possibilities are given.

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Mahesh, A., e S. C. Kaushik. "Solar adsorption cooling system: An overview". Journal of Renewable and Sustainable Energy 4, n. 2 (marzo 2012): 022701. http://dx.doi.org/10.1063/1.3691610.

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Tashtoush, Ghassan M., Mohannad Al-Ata e Atif Al-Khazali. "Solar adsorption refrigeration (SAR) system modeling". Energy Efficiency 4, n. 2 (15 agosto 2010): 247–56. http://dx.doi.org/10.1007/s12053-010-9091-5.

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Saravanan, N., e M. Edwin. "Optimization and experimental analysis of a solar powered adsorption refrigeration system using selective adsorbent/adsorbate pairs". Journal of Renewable and Sustainable Energy 14, n. 2 (marzo 2022): 023702. http://dx.doi.org/10.1063/5.0076645.

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Adsorption-based cooling system is a cost-effective method of heat conversion. It has the potential to dramatically enhance energy efficiency while also lowering pollutant levels. For this purpose, a solar-powered vapor adsorption refrigeration system (VAdRS) using activated carbon–methanol and zeolite–water as the working pair has been designed and experimentally evaluated. The aim of this experiment was to evaluate the coefficient of performance (COP) and specific cooling power (SCP) of a solar cooling unit by utilizing the optimum minimum and maximum mass concentration ratios. The novel solar-assisted adsorption refrigeration system optimization technique is used in this research to evaluate the optimal performance of the solar-powered VAdRS under various operating scenarios. The experiment was conducted at the optimum minimum and maximum mass concentration ratios of 0.1 and 0.2, respectively. The experimental results show that the activated carbon–methanol adsorption system produces a higher COP value than the zeolite–water adsorption system of 0.49–0.64 and 0.64–0.67 at constant evaporator and condenser temperature, respectively. It also showed that the higher SCP value was revealed in the zeolite–water-based adsorption cooling system as 207.5–217.4 kJ/kg. It was revealed that AC–methanol could be used to operate better in low-generating-temperature conditions. On the other hand, the zeolite–water adsorption system can be used at higher generating temperatures.

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Peng, Liping, Yulin Xie e Changquan Yang. "Insight into the photoelectrical properties of metal adsorption on a two-dimensional organic–inorganic hybrid perovskite surface: theoretical and experimental research". RSC Advances 12, n. 9 (2022): 5595–611. http://dx.doi.org/10.1039/d1ra04557a.

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Bi atom adsorption on a 2D perovskite surface structure has the minimum adsorption energy. When it uses on the solar cell electrode, the 2D perovskite solar cell of ITO/PEDOT:PSS/2D perovskite/PEI/Bi structure exhibits the highest photoelectric conversion efficiency (PCE) of 15.16%.

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Gomri, Rabah, e Billel Mebarki. "Study and Analysis by Numerical Simulation of a Solar Continuous Adsorption Chiller". Applied Mechanics and Materials 773-774 (luglio 2015): 605–9. http://dx.doi.org/10.4028/www.scientific.net/amm.773-774.605.

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Environment and energy problems over the world have motivated researchers to develop energy systems more sustainable, having as one of the possible alternative the use of solar energy as source for cooling systems. Adsorption refrigeration systems are regarded as environmentally friendly alternatives to conventional vapour compression refrigeration systems, since they can use refrigerants that do not contribute to ozone layer depletion and global warming. In this paper a performance comparison between a solar continuous adsorption cooling system without mass recovery process and solar continuous adsorption cooling system with mass recovery process is carried out. Silica-Gel as adsorbent and water as refrigerant are selected. The results show that the adsorption refrigeration machine driven by solar energy can operate effectively during four months and is able to produce cold continuously along the 24 hours of the day. The importance of the mass recovery is proved in this study by increasing the coefficient of performance and the cooling capacity produced. For the same cooling capacity produced, the required number of solar collectors with mass recovery system is lower than the required number of solar collectors in the case of the refrigeration unit without mass recovery. For the same cooling capacity the system with mass recovery process allowed lower generation temperature.

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Kafafy, Hany, Hongwei Wu, Ming Peng, Hsienwei Hu, Kai Yan, Reda M. El-Shishtawy e Dechun Zou. "Steric and Solvent Effect in Dye-Sensitized Solar Cells Utilizing Phenothiazine-Based Dyes". International Journal of Photoenergy 2014 (2014): 1–9. http://dx.doi.org/10.1155/2014/548914.

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Three phenothiazine-based dyes have been prepared and utilized as dye-sensitized solar cells (DSSCs). The effects of dye-adsorption solvent on the performances of dye-sensitized solar cells based on phenothiazine dyes were investigated in this study. The highest conversion efficiency of 3.78% was obtained using ethanol (EtOH) and 2.53% for tetrahydrofuran (THF), respectively, as dye-adsorption solvents. Cell performance using EtOH as a dye-adsorption solvent showed relatively higher performance than that using THF. Electrochemical and photochemical tests of phenothiazine dyes in solution and adsorbed on the TiO2surface showed less dye loading and coverage on the TiO2surface during adsorption in the case of THF, which decreased the solar cell performance of the DSSC using THF as adsorption solvent compared with using EtOH as adsorption solvent. Meanwhile, the steric effect of phenothiazine-based (PT1–3) dyes was also investigated. Dye with longer and branched aliphatic chain in the order ofPT1,PT2, andPT3showed an increased resistance of the recombination reaction and electron lifetime, thereby increasingVocand enhancing the overall cell performance because of the sterically hindered conformation of the phenothiazines.

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Januševičius, Karolis, Giedrė Streckienė e Violeta Misevičiūtė. "Simulation and Analysis of Small-Scale Solar Adsorption Cooling System for Cold Climate". International Journal of Environmental Science and Development 6, n. 1 (2015): 54–60. http://dx.doi.org/10.7763/ijesd.2015.v6.561.

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Saravanan, N., R. Rathnasamy e V. Ananchasivan. "Design and Analysis of Cooling Cabinet for Vaccine Storage". Advanced Materials Research 984-985 (luglio 2014): 1180–83. http://dx.doi.org/10.4028/www.scientific.net/amr.984-985.1180.

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Solar powered adsorption refrigeration system is renewable source in the future energy demands and more useful for off-grid area. In this paper a mathematical model was developed to investigate the performance of a cooling cabinet of a activated carbon-ammonia adsorption refrigeration system, and a new effective method about the refrigeration studies. A brief thermodynamic study of the cooling cabinet is carried out and the effect of operating parameters such as temperature, pressure, cooling effect of the system is numerically analyzed. The impact of solar intensity on performance of the system is significant. The cooling cabinet model is completely analysied for varies capacity and it is able to calculate the cooling cabinet coil length .The designed mathematical model is analyzed by the use of coolpack software and the results are compared with ansys software. It is observed that the system operate more efficient while maximum solar intensity and the cooling effect. Key words: Solar, Adsorption Refrigeration, Mathematical model, Analysis, Solar intensity.

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Alahmer, Ali, Xiaolin Wang e K. C. Amanul Alam. "Dynamic and Economic Investigation of a Solar Thermal-Driven Two-Bed Adsorption Chiller under Perth Climatic Conditions". Energies 13, n. 4 (24 febbraio 2020): 1005. http://dx.doi.org/10.3390/en13041005.

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Performance assessment of a two-bed silica gel-water adsorption refrigeration system driven by solar thermal energy is carried out under a climatic condition typical of Perth, Australia. A Fourier series is used to simulate solar radiation based on the actual data obtained from Meteonorm software, version 7.0 for Perth, Australia. Two economic methodologies, Payback Period and Life-Cycle Saving are used to evaluate the system economics and optimize the need for solar collector areas. The analysis showed that the order of Fourier series did not have a significant impact on the simulation radiation data and a three-order Fourier series was good enough to approximate the actual solar radiation. For a typical summer day, the average cooling capacity of the chiller at peak hour (13:00) is around 11 kW while the cyclic chiller system coefficient of performance (COP) and solar system COP are around 0.5 and 0.3, respectively. The economic analysis showed that the payback period for the solar adsorption system studied was about 11 years and the optimal solar collector area was around 38 m2 if a compound parabolic collector (CPC) panel was used. The study indicated that the utilization of the solar-driven adsorption cooling is economically and technically viable for weather conditions like those in Perth, Australia.

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Tamainot-Telto, Zacharie, Stephen John Metcalf e Neilson Ng Yande. "Adsorption Solar Air Conditioning System for Singapore Climate". Energies 15, n. 18 (7 settembre 2022): 6537. http://dx.doi.org/10.3390/en15186537.

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Abstract (sommario):

The design of an adsorption solar air conditioning system is investigated by using a model with an activated carbon–methanol working pair. This system is analysed with the solar insolation levels and ambient temperatures of Singapore. The proposed design mainly consists of two tubular reactor heat exchangers (TRHEXs) operating out of phase and driven by heat from an evacuated tube solar collector (ETSC). The pair of TRHEXs act as a thermal compressor and contain about 2.275 kg of activated carbon per reactor. The evacuated tube solar collector (ETSC) has better performance and is more cost effective than the flat plate solar collector (FPSC), even though it has a higher cost per unit. On the hottest day of the year, the proposed adsorption system has a maximum cooling power of 2.6 kW and a COP of 0.43 at a maximum driving temperature of 139 °C with a 9.8 m2 ETSC area. The system has a total estimated cost of EUR 10,550 corresponding to about SGD 14,800 with a 7-year payback time. At similar cooling capacities, the adsorption air conditioning system is expected to be more cost effective than the conventional system beyond an expected period of 7 years, with an expected lifetime of 15 to 20 years.

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32

Liu, Jia Xing, Xu Ji, Ming Li, Xiang Bo Song e Qi Chao Zhang. "Simple Analysis Solar Solid Adsorption Refrigeration in the Application of Central Air Conditioning". Advanced Materials Research 1092-1093 (marzo 2015): 87–90. http://dx.doi.org/10.4028/www.scientific.net/amr.1092-1093.87.

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Advantage of solid adsorption refrigeration is environmental protection, energy saving, simple structure, no noise and the advantages of stable and reliable operation, the use of solar energy driven refrigeration is an energy-saving environmental protection technology, it can effectively reduce the huge energy consumption and environmental pollution due to the burning of fossil energy resources. This article introduces the general situation of development of solar adsorption refrigeration, puts forward the research progress and application prospect of the solar energy air conditioning system.

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33

Li, Yang, e Song Lv. "Research of Solar Refrigeration Technology". Advanced Materials Research 1008-1009 (agosto 2014): 11–15. http://dx.doi.org/10.4028/www.scientific.net/amr.1008-1009.11.

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Abstract (sommario):

This paper introduces the characteristics of solar energy and expounds the fundamental principle of the solar absorption refrigeration, adsorption refrigeration and ejector refrigeration.It also analyzes their respective advantages and disadvantages of three solar refrigeration techniques, and the future research direction of solar refrigeration technique is prospected.

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34

Lattieff, Farkad A., Mohammed A. Atiya, Jasim M. Mahdi, Hasan Sh Majdi, Pouyan Talebizadehsardari e Wahiba Yaïci. "Performance Analysis of a Solar Cooling System with Equal and Unequal Adsorption/Desorption Operating Time". Energies 14, n. 20 (16 ottobre 2021): 6749. http://dx.doi.org/10.3390/en14206749.

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Abstract (sommario):

In solar-thermal adsorption/desorption processes, it is not always possible to preserve equal operating times for the adsorption/desorption modes due to the fluctuating supply nature of the source which largely affects the system’s operating conditions. This paper seeks to examine the impact of adopting unequal adsorption/desorption times on the entire cooling performance of solar adsorption systems. A cooling system with silica gel–water as adsorbent-adsorbate pair has been built and tested under the climatic condition of Iraq. A mathematical model has been established to predict the system performance, and the results are successfully validated via the experimental findings. The results show that, the system can be operational at the unequal adsorption/desorption times. The performance of the system with equal time is almost twice that of the unequal one. The roles of adsorption velocity, adsorption capacity, overall heat transfer coefficient, and the performance of the cooling system are also evaluated.

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35

Yi, Jie, Yanfang Duan, Chunxia Liu, Shaohong Gao, Xueting Han e Limin An. "PbS Quantum Dots Sensitized TiO2 Solar Cells Prepared by Successive Ionic Layer Absorption and Reaction with Different Adsorption Layers". Journal of Nanoscience and Nanotechnology 16, n. 4 (1 aprile 2016): 3904–8. http://dx.doi.org/10.1166/jnn.2016.11849.

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Lead sulfide (PbS) quantum dots (QDs) have been synthesized via successive ionic layer adsorption and reaction (SILAR) on a titanium dioxide (TiO2 nanoporous film for the fabrication of quantum dot-sensitized solar cells (QDSCs). The reaction is environmental friendly and energy saving. The green synthesized PbS QDs match the maximum remittance region of the solar spectrum and are suitable as sensitizers for TiO2 electrodes for cell devices application. PbS QDs were adsorbed in different adsorption layers in order to improve the solar cell performance. The optical properties of PbS sensitized TiO2 films were studied by scanning electron microscopy and UV-Vis absorbance spectroscopy. The photovoltaic characteristics of the PbS QDSCs were analyzed by I–V characteristics and electrochemical impedance spectroscopy. As a result, the light harvesting was enhanced with increasing SILAR adsorption layers. The maximum photovoltaic conversion efficiency of the PbS QDSCs (3.14%) was obtained at the 12 adsorption layers with the highest short circuit current density and lowest charge transfer resistance.

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36

Pilát, Peter, Marek Patsch e Milan Malcho. "Solar heat utilization for adsorption cooling device". EPJ Web of Conferences 25 (2012): 01074. http://dx.doi.org/10.1051/epjconf/20122501074.

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37

Robbins, Thomas, e Srinivas Garimella. "An autonomous solar driven adsorption cooling system". Solar Energy 211 (novembre 2020): 1318–24. http://dx.doi.org/10.1016/j.solener.2020.10.068.

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38

Sumathy, K., e Li Zhongfu. "Experiments with solar-powered adsorption ice-maker". Renewable Energy 16, n. 1-4 (gennaio 1999): 704–7. http://dx.doi.org/10.1016/s0960-1481(98)00256-0.

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39

Khattab, N. M., H. Sharawy e M. Helmy. "Development of Novel Solar Adsorption Cooling Tube". Energy Procedia 18 (2012): 709–14. http://dx.doi.org/10.1016/j.egypro.2012.05.086.

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40

Hassan, H. Z., A. A. Mohamad e R. Bennacer. "Simulation of an adsorption solar cooling system". Energy 36, n. 1 (gennaio 2011): 530–37. http://dx.doi.org/10.1016/j.energy.2010.10.011.

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41

Chekirou, Wassila, Nahman Boukheit e Ahcene Karaali. "Performance improvement of adsorption solar cooling system". International Journal of Hydrogen Energy 41, n. 17 (maggio 2016): 7169–74. http://dx.doi.org/10.1016/j.ijhydene.2016.02.140.

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42

Yuasa, Takuya, Ryo Kawakami, Yuuki Sato, Yasushige Mori, Motonari Adachi e Shinzo Yoshikado. "Dye adsorption for dye-sensitized solar cell". Solar Energy Materials and Solar Cells 102 (luglio 2012): 2–7. http://dx.doi.org/10.1016/j.solmat.2011.11.051.

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43

Ghilen, Najeh, Mohammed El Ganaoui, Slimane Gabsi e Riad Benelmir. "Performance of a Solar-Biomass Adsorption Chiller". Fluid Dynamics & Materials Processing 19, n. 4 (2023): 1015–26. http://dx.doi.org/10.32604/fdmp.2022.022285.

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44

Keevallik, S., e Ü. Rannik. "Solar surface adsorption from different satellite observations". Advances in Space Research 16, n. 10 (gennaio 1995): 5–14. http://dx.doi.org/10.1016/0273-1177(95)00372-l.

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45

Anyanwu, E. E. "Review of solid adsorption solar refrigeration II:". Energy Conversion and Management 45, n. 7-8 (maggio 2004): 1279–95. http://dx.doi.org/10.1016/j.enconman.2003.08.003.

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46

Khattab, N. M. "A novel solar-powered adsorption refrigeration module". Applied Thermal Engineering 24, n. 17-18 (dicembre 2004): 2747–60. http://dx.doi.org/10.1016/j.applthermaleng.2004.04.001.

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47

Mohamed-Ali Djebiret, Brahim Abbad, Adel Benchabane, Maamar Ouali, Ferhat Yahi, Mohand Berdja e Amar Rouag. "Experimental study of solar adsorption refrigeration device". Journal of Applied Engineering Science & Technology 4, n. 2 (22 giugno 2018): 8. http://dx.doi.org/10.69717/jaest.v4.i2.77.

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Abstract (sommario):

This work presents an experimental study of a solar adsorption refrigeration device using activated carbon AC-35 /methanol as working pair. The studied device is designed, realized and tested in the Development of Solar Equipment Unit, UDES, Tipaza (Algeria). The adsorption and desorption tests, carried out on the experimental device, were conducted inside the laboratory using a halogen lamp as an energy source instead the sun. The lamp is installed perpendicularly to the surface of the tubular adsorber to test four radiation levels: 800, 820, 1000 and 1020 W/m². A calculation code is developed, using the Dubinin-Astakhov mathematical model, to evaluate the thermodynamic coefficient of performance, COP th , of the experimental device. Thus, a parametric study is presented to examine the influence of the construction material and the weight of the adsorber on the COP th , the amount of cold produced in the evaporator, Qf, and the total heat supplied to the system, Qc.

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48

Singh, Pardeep, Pankaj Raizada, Deepak Pathania, Amit Kumar e Pankaj Thakur. "Preparation of BSA-ZnWO4Nanocomposites with Enhanced Adsorptional Photocatalytic Activity for Methylene Blue Degradation". International Journal of Photoenergy 2013 (2013): 1–7. http://dx.doi.org/10.1155/2013/726250.

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Abstract (sommario):

This study explains the effect of adsorption on dye degradation using bovine serum alum and ZnWO4based nanocomposite (BSA-ZnWO4). The synthesis of BSA-ZnWO4was performed by a hydrothermal method involving the encapsulation of ZnWO4with BSA. BSA-ZnWO4was characterized by SEM, TEM, XRD, FTIR, and UV-Vis spectral techniques. The photocatalytic experiments were performed under solar light. The dye removal was investigated under different reaction conditions. The photocatalytic efficiency of solar/BSA-ZnWO4process was higher compared to solar/ZnWO4, dark/BSA-ZnWO4, solar/BSA, dark/ZnWO4, and solar light systems. The simultaneous adsorption and photodegradation process (A + P) was the most efficient process due to rapid destruction of adsorbed dye molecules. BSA-ZnWO4showed superior degradation efficiency and reusability over ZnWO4for MB degradation.

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49

Zhao, Hui Zhong, Xiao Cui Sun, Hai Bin Liang e Kun Yan. "Adsorption Performance of Compound Adsorbent Using the Thermal Vacuum Method". Advanced Materials Research 219-220 (marzo 2011): 865–69. http://dx.doi.org/10.4028/www.scientific.net/amr.219-220.865.

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Abstract (sommario):

The thermal vacuum method was used to test the adsorption performance of compound adsorbent. This thermal vacuum method, without vacuum pump, can expel the air of system up to its partial pressure, lower than 2 Pa. the adsorption performance of 13X zeolite and some compound adsorbent were tested by this way. Conclusions can be drawn as following: the adsorption capacity of 13X measured by this way has the less difference (<10%) with the reference. In this experimental system, the compound adsorbent, which has better adsorption performance and mould performance, was used in a solar cooling tube system as adsorbent and the experimental coefficient of performance (COP) of the solar cooling tube can reach about 0.26.

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50

Tilak V. Chavda, Naveen Kumar e A. Sreekumar. "Development of Solar Powered Intermittent Adsorption Refrigeration System". Journal of Agricultural Engineering (India) 49, n. 4 (17 febbraio 2024): 48–53. http://dx.doi.org/10.52151/jae2012494.1495.

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