Статті в журналах: "Activated carbon; methanol; adsorption refrigeration"

1

Ji, A. Min, Tian Tian, and Bo Ning Tang. "Study on Solar Energy for Pre-Cooling Technology of Fruit and Vegetable." Applied Mechanics and Materials 700 (December 2014): 37–41. http://dx.doi.org/10.4028/www.scientific.net/amm.700.37.

Повний текст джерела

Анотація:

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.

Стилі APA, Harvard, Vancouver, ISO та ін.

2

Wang, R. Z., J. P. Jia, Y. H. Zhu, Y. Teng, J. Y. Wu, J. Cheng, and Q. B. Wang. "Study on a New Solid Absorption Refrigeration Pair: Active Carbon Fiber—Methanol." Journal of Solar Energy Engineering 119, no. 3 (August 1, 1997): 214–18. http://dx.doi.org/10.1115/1.2888021.

Повний текст джерела

Анотація:

Our experiments show that active carbon fiber (ACF) might be a good substitute for activated carbon (AC) as the refrigeration capacity Qf and adsorption time of ACF are three times more and 1/5 ∼ 1/10 of those of normal activated carbon (AC), respectively. The COP for ACF-methanol could be 10 percent ∼ 20 percent higher than that of AC-methanol. Thus ACF-methanol might be a good adsorption refrigeration pair for constructing adsorption refrigerators, especially those for household applications.

Стилі APA, Harvard, Vancouver, ISO та ін.

3

Khaleel, Wissam H., Abdul Hadi N. Khalifa, and Hilal Tareq Abdulazeez. "Performance Study of Solar Adsorption Refrigeration System Using Activated Carbon - Methanol." Al-Nahrain Journal for Engineering Sciences 21, no. 4 (December 21, 2018): 523–31. http://dx.doi.org/10.29194/njes.21040523.

Повний текст джерела

Анотація:

The depleting of the conventional sources of energy and the excess use of HCF components lead to the need for new techniques both for conservation of energy sources for the future and for decreasing the its harmful effects on the environment. This study investigated the adsorption capabilities of activated carbon. The adsorption of methanol on this substance was tested for their application in the adsorption refrigeration system based on solar energy. Adsorption refrigeration system has been designed and manufactured with the energy source being solar energy. Methanol/activated carbon pairs have been used in experiments. The present work focused on the performance of the adsorption refrigeration system considering the temperature attained in the evaporator and the cooled spaced cabinet. The amounts of activated carbon used was (8 kg), while the amount of methanol were (1, 1.25, and 1.5) kg. The experiments were done in different days of the year. The amount of adsorption of methanol (as a result of decreasing the evaporator and cooled spaced temperature) was found to depend on the generator pressure and its increase as the primary generator pressure decreases. The best mass of methanol used was (1 kg) which give the lowest temperature obtained at the evaporative surface was ( 3.4 oC ) at the day ( 4/4/2017 ). The results shown that even in cloudy days there is a benefit from using such a system because the temperature attained is enough to start the adsorption process. The lowest temperature obtained at the evaporative surface was (3.4 oC) at the day (4/4/2017) for methanol mass of (1 kg) at an opening time of the valve between the evaporator and the generator (9:30am). The increase of methanol amount used in the experiment led to a good decrease in temperature attained in cooled spaced, but this is related to the time of connecting the evaporator and generator.

Стилі APA, Harvard, Vancouver, ISO та ін.

4

Sur, Anirban, Randip Das, and Ramesh Sah. "Influence of initial bed temperature on bed performance of an adsorption refrigeration system." Thermal Science 22, no. 6 Part A (2018): 2583–95. http://dx.doi.org/10.2298/tsci160108254s.

Повний текст джерела

Анотація:

The study deals with the complete dynamic analysis (numerical and practical) of an existing adsorption refrigeration system. The adsorption refrigeration setup is available at Indian School of Mines (Dhanbad, India), Mechanical engineering department. The system operates with activated carbon (as an adsorbent) and methanol (as refrigerant).Numerical model is established base on energy equation of the heat transfer fluid (water) and transient heat and mass transfer equations of the adsorbent bed. The input temperature of heat source is 90?C, which is very low compared to other low-grade energy input refrigeration system. The thermo-physical properties of an adsorptive cooling system (using activated carbon?methanol pair) are considered in this model. In this analysis influence of initial bed temperature (T1) on the bed performances are analysed mathematically and experimentally. The simulation and practical results of this system show that the cycle time decreases with increase in initial bed temperature and the minimum cycle time is 10.74 hours (884 minutes for practical cycle) for initial bed temperature of 40?C. Maximum system COP and specific cooling capacity are 0.436 and 94.63 kJ/kg of adsorbent under a condenser and evaporator temperatures of 35?C and 5?C, respectively. This analysis will help to make a comparison between simulated and experimental results of a granular bed adsorption refrigeration system and also to meet positive cooling needs in off-grid electricity regions.

Стилі APA, Harvard, Vancouver, ISO та ін.

5

Shabir, Faizan, Muhammad Sultan, Yasir Niaz, Muhammad Usman, Sobhy M. Ibrahim, Yongqiang Feng, Bukke Kiran Naik, Abdul Nasir, and Imran Ali. "Steady-State Investigation of Carbon-Based Adsorbent–Adsorbate Pairs for Heat Transformation Application." Sustainability 12, no. 17 (August 28, 2020): 7040. http://dx.doi.org/10.3390/su12177040.

Повний текст джерела

Анотація:

In this study, the ideal adsorption cycle behavior of eight activated carbon and refrigerant pairs is evaluated. The selected pairs are KOH6-PR/ethanol, WPT-AC/ethanol, Maxsorb-III/methanol, Maxsorb-III/CO2, Maxsorb-III/n-butane, Maxsorb-III/R-134a, SAC-2/R32 and Maxsorb-III/R507a. The following cooling performance parameters are evaluated for all pairs: specific cooling energy (SCE), concentration difference (ΔW) and coefficient of performance (COP) of ideal adsorption cooling and refrigeration cycles. The evaporator temperatures for the applications of adsorption cooling and refrigeration are selected as 7 and −5 °C, respectively. It is found that the Maxsorb-III/methanol pair has shown the highest specific cooling energy and coefficient of performance in a wide range of desorption temperatures; i.e., for the adsorption cooling cycle it has SCE and COP of 639.83 kJ/kg and 0.803, respectively, with desorption temperatures of 80 °C. The KOH6-PR/ethanol and the WPT-AC/ethanol pairs also give good performances comparable to that of the Maxsorb-III/methanol pair. However, the SAC-2/R32 pair possesses a higher concentration difference than the Maxsorb-III/methanol, KOH6-PR/ethanol and WPT-AC/ethanol pairs but shows a lower performance. This is due to the lower isosteric heat of adsorption of SAC-2/R32 compared to these pairs. It is found that Maxsorb-III/methanol, KOH6-PR/ethanol and WPT-AC/ethanol are the most promising pairs for application in designing adsorption cooling and refrigeration systems.

Стилі APA, Harvard, Vancouver, ISO та ін.

6

Saravanan, N., and 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, no. 2 (March 2022): 023702. http://dx.doi.org/10.1063/5.0076645.

Повний текст джерела

Анотація:

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.

Стилі APA, Harvard, Vancouver, ISO та ін.

7

Sur, Anirban, and Randip K. Das. "Numerical Modeling and Thermal Analysis of an Adsorption Refrigeration System." International Journal of Air-Conditioning and Refrigeration 23, no. 04 (December 2015): 1550033. http://dx.doi.org/10.1142/s2010132515500339.

Повний текст джерела

Анотація:

The aim of this paper is to develop a complete, precise and simple numerical model based on the thermophysical properties of an adsorptive cooling system (using activated carbon–methanol pair), analyze and discuss the heat and mass transfer processes and identify the parameters which influence the system performance. In the design of adsorption refrigeration system, the characteristics of both adsorbate–adsorbent pairs and system operating conditions are very important. So in this model, different thermophysical properties of working pair such as, specific heat, density, isosteric heat of adsorption and desorption, and different temperatures of the system are considered. A simulation code, written in FORTRAN, is carried out. The performance of the system is assessed in terms of refrigeration effect and coefficient of performance (COP).

Стилі APA, Harvard, Vancouver, ISO та ін.

8

Soni, Palash, Sruthi Lolalis, Bidyut Mazumdar, Shubhankar Bhowmick, and Vivek Kumar Gaba. "Performance Analysis of an Adsorption Refrigeration System Working on Activated Carbon/Methanol Pair Using Finned Tube Type Adsorber Bed." International Journal of Heat and Technology 39, no. 4 (August 31, 2021): 1335–42. http://dx.doi.org/10.18280/ijht.390433.

Повний текст джерела

Анотація:

Adsorption refrigeration, being a unique and eco-friendly technology, has gained popularity over conventional refrigeration systems. The present study is aimed at developing an annular finned tube adsorber model which serves as a thermal compressor in adsorption refrigeration systems. The mathematical model is addressed numerically using finite difference discretization method and explicit scheme was used for the solution. The generalized model has been simulated for activated carbon–methanol working pair. The system has an optimum cycle time of 1800s. It was found to have a highest refrigeration capacity of 260.66 kJ/kg at a regeneration temperature of 393 K and evaporator temperature of 283 K. The highest COP (Coefficient of Performance) achieved by the system is 0.3706 at a regeneration temperature of 353 K and evaporator temperature of 283 K. A highest SCP (Specific Cooling Power) of 144.8 W/kg was obtained at an evaporator temperature of 283 K and regeneration temperature of 393 K.

Стилі APA, Harvard, Vancouver, ISO та ін.

9

Hassan, H. Z. "Energy Analysis and Performance Evaluation of the Adsorption Refrigeration System." ISRN Mechanical Engineering 2013 (January 3, 2013): 1–14. http://dx.doi.org/10.1155/2013/704340.

Повний текст джерела

Анотація:

A complete steady state thermodynamic differential analysis is developed for the adsorption-based refrigeration systems. The introduced thermodynamic model accurately represents the behaviour of adsorption cooling systems, based on a precise, reasonable, and clear fundamental approach. Based on the energy conservation principle, all components and processes in the system are analyzed. The dynamics of adsorption is expressed by the Dubinin-Astakhov adsorption equilibrium model. All types of energy interactions are evaluated in order to determine the theoretical performance and the operating parameters of the system. Moreover, the actual thermodynamic properties of the refrigerant are considered in developing the model. The case studied is an ice maker which uses activated carbon-methanol as the working pair.

Стилі APA, Harvard, Vancouver, ISO та ін.

10

Grzebielec, Andrzej, Artur Rusowicz, and Rafał Laskowski. "Experimental Study On Thermal Wave Type Adsorption Refrigeration System Working On A Pair Of Activated Carbon And Methanol." Chemical and Process Engineering 36, no. 4 (December 1, 2015): 395–404. http://dx.doi.org/10.1515/cpe-2015-0028.

Повний текст джерела

Анотація:

Abstract The aim of the study was to examine the efficiency of the thermal wave type adsorption refrigerating equipment working on a pair of activated carbon and methanol. Adsorption units can work in trigeneration systems and in applications driven by waste heat. They can be built also as a part of hybrid sorption-compressor systems, and they are very popular in solar refrigeration systems and energy storage units. The device examined in this study operates in a special mode called thermal wave. This mode allows to achieve higher efficiency rates than the normal mode of operation, as a significant contributor to transport heat from one to the other adsorber. To carry out the experiment a test bench was built, consisting of two cylindrical adsorbers filled with activated carbon, condenser, evaporator, oil heater and two oil coolers. Thermal oil circulation was responsible for providing and receiving heat from adsorbers. In order to perform the correct action a special control algorithm device was developed and implemented to keep the temperature in the evaporator at a preset level. The experimental results show the operating parameters changes in both adsorbers. Obtained COP (coefficient of performance) for the cycle was 0.13.

Стилі APA, Harvard, Vancouver, ISO та ін.

11

Wang, R. Z., M. Li, Y. X. Xu, J. Y. Wu, and H. B. Shou. "A Combined Cycle of Heating and Adsorption Refrigeration: Theory and Experiment." Journal of Solar Energy Engineering 124, no. 1 (July 1, 2001): 70–76. http://dx.doi.org/10.1115/1.1445442.

Повний текст джерела

Анотація:

A combined cycle capable of heating and adsorption refrigeration is proposed, and the experimental prototype has been installed. The system consists of a heater, a water bath, an activated carbon-methanol adsorption bed and an ice box. This system has been tested with electric heating, and has been found that with 61 MJ heating, the 120 kg water in the bath can be heated from 22°C to 92°C, of while 9 kg ice at −1.5°C is made. The calculated COPsystem is 0.0591 and COPcycle is 0.41. After reconstruction to a real hybrid household water heater-refrigerator, when 55 MJ heating is added to 120 kg of 21°C water, and the condensing temperature is controlled at about 30°C, the result is the 4 kg water contained inside the methanol refrigerant evaporator was iced to −2°C, the cooling capacity of the ice and the refrigerant in the evaporator will maintain the 100 liter cold box for about three days below 5°C. The experiments show the potential of the application of the solar powered hybrid water heater and refrigerator. Theoretical simulation has been done, which is in good agreement with experimental results. This research shows that the hybrid solar water heating and ice-making is reasonable, and the combined cycle of heating and cooling is meaningful for real applications of adsorption systems.

Стилі APA, Harvard, Vancouver, ISO та ін.

12

Ji, Amin, Chang Jiang Wang, Yan Yu, Chun Ying Zhang, and Tian Tian. "Experimental Study on Solar Energy and Adsorption Radiation Air Conditioning System." Applied Mechanics and Materials 448-453 (October 2013): 1555–58. http://dx.doi.org/10.4028/www.scientific.net/amm.448-453.1555.

Повний текст джерела

Анотація:

This paper discusses the principles of solar adsorption refrigeration and the characteristics of air conditioning radiation, designs solar adsorbent bed with activated carbon - methanol as working pair and its accompanying condenser, evaporator, radiant cooling tubes and other equipment. Through experiments, it changes water supply by change flow rate of chilled water, in order to get chilled water supply and return water temperature and room temperature curve. To analysis COP value of system under different flow rate of chilled water, and get the optimal flow rate of chilled water supply.

Стилі APA, Harvard, Vancouver, ISO та ін.

13

Li, M., and R. Z. Wang. "Study of the Advanced Application Characteristics of a Solar Solid Adsorption Refrigerator." Adsorption Science & Technology 23, no. 4 (May 2005): 347–56. http://dx.doi.org/10.1260/0263617054769978.

Повний текст джерела

Анотація:

On the basis of previous research work on solar solid adsorption refrigeration, some advanced application methods for a solar ice maker have been studied. These include the efficient design of a new adsorbent bed; experimental studies of working pairs for a solar ice maker using activated carbon—methanol and activated carbon—ethanol; the effects of sky cloud cover on a solar ice maker; and the efficient utilization of a solar ice maker with provision for heating and cooling. The provision of tables to assist in the choice of a mass-produced solar ice maker was also examined. Simulation of the characteristics of a solar ice maker has been undertaken in some areas in Tibet where the natural climatic conditions appear to be ideal for the operation of such a device.

Стилі APA, Harvard, Vancouver, ISO та ін.

14

Emetere, M. E., P. O. Oso-Ola, and S. A. Afolalu. "Role of chemical equilibrium on the performance of an activated carbon–methanol adsorption refrigeration tube." IOP Conference Series: Materials Science and Engineering 1036, no. 1 (March 1, 2021): 012080. http://dx.doi.org/10.1088/1757-899x/1036/1/012080.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

15

Alamoudi, H. A., and A. M. Abdel-Dayem. "Design Optimization and Simulation of an Ice Plant Working by Solar Adsorption Technology." European Journal of Energy Research 1, no. 4 (October 27, 2021): 13–22. http://dx.doi.org/10.24018/ejenergy.2021.1.4.22.

Повний текст джерела

Анотація:

This research presents a design optimization of a solar adsorption ice plant using activated carbon and methanol as working pairs in the climate of Makkah to produce a ton of ice per day. The plant consists of six adsorption refrigeration units. Each unit has 72 separate cylindrical adsorbent beds connected with its own condenser, valve, and evaporator. The unit is heated by seven evacuated-tube collectors connected in parallel. Then the total number of collectors are 42 collectors. The beds are filled by estimated amount of 540 kg of activated carbon with 178 kg of methanol. Selection and dimensioning of each component were carried out based on previous recommended values. A mathematical model and simulation were developed to validate the system performance along the year. The results showed that plant could produce up to ton of ice daily along the year. The coefficient of performance can reach 0.9 with condenser and evaporator temperatures of 35°C and -5°C respectively. The performance of the system is greatly affected by ambient temperature than solar radiation. Therefore, the best performance and largest amount of ice was found in the winter season.

Стилі APA, Harvard, Vancouver, ISO та ін.

16

Adenane, Ghrici, Benramdane Mohammed, and Ghernaout Mea. "Effect of Operating Temperatures and Working Pairs on Performance of Solar Adsorption Cooling System." International Journal of Heat and Technology 39, no. 4 (August 31, 2021): 1280–86. http://dx.doi.org/10.18280/ijht.390426.

Повний текст джерела

Анотація:

Renewable energies including solar energy requirements for refrigeration and air conditioning are increasingly gaining interest due to the refrigerants friendly to the environment. However, it was found that these technologies have some limitations like the low performance and their high cost. This paper proposes a comparative study of a solar adsorption refrigeration machine. The study consists in determining the influence of thermodynamic parameters of operation on the performance of the system. This is based on a thermodynamic model using different types of adsorbent / adsorbate pairs. The main parameters considered in this study are: temperature of generation, evaporation, maximum heating temperature, condensation pressure as well as the type of the pair used: activated carbon / methanol and zeolite / water. Simulations for different thermodynamic parameters show that the COP is very sensitive to the generation and evaporation temperatures as well as the maximum heating temperature, on the other hand it was slightly influenced by the condensation pressure. The results obtained have shown that the AC / methanol pair is more profitable than the zeolite / water pair.

Стилі APA, Harvard, Vancouver, ISO та ін.

17

Dieng, Biram, Mamadou Lamine Solly, and Mouhamadou Lamine Cisse. "INFLUENCE OF OPERATING TEMPERATURES ON THE SOLAR ADSORPTION REFRIGERATION MACHINE USING THE ACTIVATED CARBON-METHANOL PAIR." International Journal of Advanced Research 8, no. 7 (July 31, 2020): 250–59. http://dx.doi.org/10.21474/ijar01/11287.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

18

Baiju, V., and C. Muraleedharan. "Artificial neural network modelling of adsorbent bed in a solar adsorption refrigeration system." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 227, no. 2 (May 24, 2012): 346–58. http://dx.doi.org/10.1177/0954406212448606.

Повний текст джерела

Анотація:

This article analyses the adsorbent bed in an adsorption refrigeration system. After establishing the similarity to the compression process in a vapour compression system, thermodynamic analysis of the adsorbent bed in vapour adsorption system is carried out for evaluating the performance index, exergy destruction, uptake efficiency and exergetic efficiency of the adsorbent bed in a typical solar adsorption refrigeration system. This article also presents isothermal and isobaric modelling of methanol on highly porous activated carbon. The experimental data have been fitted with Dubinin–Astakhov and Dubinin–Radushkevitch equations. The isosteric heat of adsorption is also extracted from the present experimental data. The use of artificial neural network model is proposed to predict the performance of the adsorbent bed used. The back propagation algorithm with three different variants namely scaled conjugate gradient, Pola–Ribiere conjugate gradient and Levenberg–Marquardt and logistic sigmoid transfer function are used, so that the best approach could be found. After training, it is found that Levenberg–Marquardt algorithm with 14 neurons is the most suitable for modelling, the adsorbent bed in a solar adsorption refrigeration system. The artificial neural network predictions of performance parameters agrees well with experimental values with correlation coefficient ( R2) values close to 1 and maximum percentage of error less than 5%. The root mean square and covariance values are also found to be within the acceptable limits.

Стилі APA, Harvard, Vancouver, ISO та ін.

19

Abdel-Dayem, Adel Mohamed, and Mohammed Abdulrahman Baharith. "Numerical Simulation and Optimization of a Solar Adsorption Icemaker." International Journal of Heat and Technology 40, no. 4 (August 31, 2022): 1033–43. http://dx.doi.org/10.18280/ijht.400421.

Повний текст джерела

Анотація:

A solar adsorption ice maker was numerically studied. The system is an adsorption cycle that is connected to a separate solar heating system. An oil solar collector is connected to the generator of the adsorption cycle through a heat-exchanger in a closed loop. A refrigeration pair of Methanol-Activated Carbon (AC) was considered in the adsorption cycle. A mathematical model was developed for each component of the system. A transient numerical simulation was established, and the annual system performance was demonstrated under weather conditions of Makkah city, 21.5 ⸰N. The system unique design was achieved, and the ideal mass was predicted for the adsorbent and adsorbate together maintaining a constant percentage between them. It is found that the system which apply the Activated carbon/Methanol YKAC (14-20 MESH) might possibly deliver high solar system performance (SCOP) of about 0.26 during the cold days and 0.367 of cycle. As expected, lower temperature of the condenser and higher temperature of the evaporator can improve the system COP. In addition, three different kinds of collectors were considered and the maximum efficiency of about 0.80 was achieved for flat plate at optimum area of 3.15 m2 which is higher than both evacuated-tube (ETC) and parabolic trough collector (PTC) all over the year. The ETC efficiency is about 0.71 at ideal collector area of 3.5 square meters while the optimum area of the parabolic trough is 8.4 m2 at 0.79 of efficiency. In conclusion, the system results recommended that 22kg of ice could be produced every day for each square meter of solar collector.

Стилі APA, Harvard, Vancouver, ISO та ін.

20

Passos, E., F. Meunier, and J. C. Gianola. "Thermodynamic performance improvement of an intermittent solar-powered refrigeration cycle using adsorption of methanol on activated carbon." Journal of Heat Recovery Systems 6, no. 3 (January 1986): 259–64. http://dx.doi.org/10.1016/0198-7593(86)90010-x.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

21

Pons, M., and J. J. Guilleminot. "Design of an Experimental Solar-Powered, Solid-Adsorption Ice Maker." Journal of Solar Energy Engineering 108, no. 4 (November 1, 1986): 332–37. http://dx.doi.org/10.1115/1.3268115.

Повний текст джерела

Анотація:

Purely thermal heat pumps can be devised with adsorbate/solid adsorbent pairs, for example for refrigeration purposes. As each cycle consists of two periods, i.e., heating/desorption/condensation and cooling/adsorption/evaporation, this mode of operation is well-suited to solar energy. After experiments with the Zeolite/Water pair, a solar-powered ice maker was designed with the Activated Carbon/Methanol pair, and a prototype was built in Orsay. The solar collectors (6 m2) contain, on the whole, 130 kg of A.C., the condensers are air-cooled, and the evaporator has a net production of 30–35 kg of ice per sunny day. The ice is easily removed, and in principle the machine could be automatically operated. The net solar C.O.P. is 0.12, which makes this machine one of the most efficient solar ice makers.

Стилі APA, Harvard, Vancouver, ISO та ін.

22

Ugale, Vinayak D., and Amol D. Pitale. "A Review on Working Pair Used in Adsorption Cooling System." International Journal of Air-Conditioning and Refrigeration 23, no. 02 (May 27, 2015): 1530001. http://dx.doi.org/10.1142/s2010132515300013.

Повний текст джерела

Анотація:

Adsorption cooling system find its application in refrigeration, air conditioning, chiller, Ice making, etc. It uses thermal energy as driving force. Adsorption systems are environmental friendly (zero global warming potential and ozone depleting potential) and also eliminates use of compressor and minimize vibration problem. So it can be used as substitute for conventional vapor compression refrigeration system or vapor absorption system. The adsorption generally classified in two types as physical adsorption (due to weak van der waal forces) and chemical adsorption (chemical reaction between adsorbent and adsorbate form new molecules). The working pair of adsorber and adsorbate play vital role in the performance of adsorption system. Activated carbon, zeolite, silica gel are commonly used adsorber and water, ammonia, methanol and ethanol can be used as adsorbate. The poor heat and mass transfer performance of adsorption is major challenge for researchers. The heat transfer performance of adsorption system can be increased by increasing heat transfer area of adsorber bed i.e., design of new adsorber bed, while mass transfer performance is improved by use of new adsorbent with higher sorption rate. Composite adsorber solve the problem of heat and mass transfer performance of chemical adsorbents and adsorption quantity of physical adsorbents by combination of chemical and physical adsorbent but it can add some limitation with it. In this paper, various adsorption pair, their selection, design of adsorber bed, methods to improve thermal performance of adsorber bed is reviewed with their properties, advantages and limitations.

Стилі APA, Harvard, Vancouver, ISO та ін.

23

Baiju, V., and C. Muraleedharan. "Exergy Assessment of Single Stage Solar Adsorption Refrigeration System Using ANN." ISRN Mechanical Engineering 2012 (September 25, 2012): 1–10. http://dx.doi.org/10.5402/2012/915154.

Повний текст джерела

Анотація:

A new approach based on artificial intelligence is proposed here for the exergy assessment of solar adsorption refrigeration system working with activated carbon-methanol pair. Artificial neural network model is used for the prediction of exergy destruction and exergy efficiency of each component of the system. Pressure, temperature and solar insolation are used as input variables for developing the artificial neural network model. The back propagation algorithm with three different variants such as CGP, SCG and LM are used in the network A and network B. The most suitable algorithm and the number of neurons in hidden layer are found as LM with 9 for network A and SCG with 17 for the Network B. The artificial neural network predicted results are compared with the calculated values of exergy destruction and exergy efficiency. The values of the exergy destruction and exergy efficiency of components (condenser, expansion device, evaporator, adsorbent bed, solar concentrator and overall system) are found to be close to 1. The RMS and COV values are found to be very low in all cases. The comparison of the results suggests that the artificial neural network provided results are within the acceptable range.

Стилі APA, Harvard, Vancouver, ISO та ін.

24

Zhao, Yongling, Eric Hu, and Antoni Blazewicz. "Dynamic modelling of an activated carbon–methanol adsorption refrigeration tube with considerations of interfacial convection and transient pressure process." Applied Energy 95 (July 2012): 276–84. http://dx.doi.org/10.1016/j.apenergy.2012.02.050.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

25

Wang, R. Z., J. Y. Wu, and Y. X. Xu. "A Continuous Heat Regenerative Adsorption Refrigerator Using Spiral Plate Heat Exchanger as Adsorbers: Improvements." Journal of Solar Energy Engineering 121, no. 1 (February 1, 1999): 14–19. http://dx.doi.org/10.1115/1.2888135.

Повний текст джерела

Анотація:

Spiral plate heat exchangers as adsorbers have been proposed, and a prototype heat regenerative adsorption refrigerator using activated carbon-methanol pair has been developed and tested. Various improvements have been made, at last we get a specific cooling power for 2.6 kg-ice/day-kg adsorbent at the condition of generation temperature lower than 100°C. Discussions on the arrangements of thermal cycles and influences of design are shown.

Стилі APA, Harvard, Vancouver, ISO та ін.

26

Anyanwu, E. E., U. U. Oteh, and N. V. Ogueke. "Simulation of a solid adsorption solar refrigerator using activated carbon/methanol adsorbent/refrigerant pair." Energy Conversion and Management 42, no. 7 (May 2001): 899–915. http://dx.doi.org/10.1016/s0196-8904(00)00091-1.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

27

Allouache, Nadia, Rachid Bennacer, Salahs Chikh, and A. Al Mers. "Numerical Analysis of Heat and Mass Transfer in an Annular Porous Adsorber for Solar Cooling System." Defect and Diffusion Forum 297-301 (April 2010): 802–7. http://dx.doi.org/10.4028/www.scientific.net/ddf.297-301.802.

Повний текст джерела

Анотація:

The present study deals with a solid adsorption refrigerator analysis using activated carbon/methanol pair. It is a contribution to technology development of solar cooling systems. The main objective consists to analyse the heat and mass transfer in an annular porous adsorber that is the most important component of the system. The porous medium is contained in the annular space and the adsorber is heated by solar energy. A general model equation is used for modelling the transient heat and mass transfer. Effects of the key parameters on the adsorbed quantity, the coefficient of performance, and thus on the system performance are analysed and discussed.

Стилі APA, Harvard, Vancouver, ISO та ін.

28

Sitorus, Tulus Burhanuddin. "KINERJA KOLEKTOR TIPE PLAT DATAR PADA MESIN PENDINGIN ADSORPSI TENAGA SURYA DI KOTA MEDAN." Jurnal Teknosains 7, no. 2 (September 8, 2018): 94. http://dx.doi.org/10.22146/teknosains.35327.

Повний текст джерела

Анотація:

The performance of a flat plate collector on adsorption refrigerator driven by the solar collector was investigated in the present work. Based on a study conducted no researcher studies the performance of solar collectors used in adsorption cooling system. The adsorbent used in the collector was 20 kg ordinary powder activated carbon of coconut shell produced in the Sumatera Utara province of Indonesia, 5 liters of methanol as adsorbate and 6 liters of water as the medium that was cooled. The experiments were carried out under varying weather conditions with total solar radiation about 12619-17807 kJ/m2/cycle in Medan city. The experimental results show that the values of collector efficiency obtained were about 52.11-53.92%. The values of coefficient of performance (COP) obtained were in the range of 0.0318-0.0449. The results of the statistical study suggest that the effect of the weather conditions on collector efficiency thereabout 96%.

Стилі APA, Harvard, Vancouver, ISO та ін.

29

Anyanwu, E. E., and C. I. Ezekwe. "Design, construction and test run of a solid adsorption solar refrigerator using activated carbon/methanol, as adsorbent/adsorbate pair." Energy Conversion and Management 44, no. 18 (November 2003): 2879–92. http://dx.doi.org/10.1016/s0196-8904(03)00072-4.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

30

Laidi, Maamar, and Salah Hanini. "Optimal solar COP prediction of a solar-assisted adsorption refrigeration system working with activated carbon/methanol as working pairs using direct and inverse artificial neural network." International Journal of Refrigeration 36, no. 1 (January 2013): 247–57. http://dx.doi.org/10.1016/j.ijrefrig.2012.09.016.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

31

Cacciola, G., G. Restuccia, and L. Mercadante. "Composites of activated carbon for refrigeration adsorption machines." Carbon 33, no. 9 (1995): 1205–10. http://dx.doi.org/10.1016/0008-6223(95)00051-e.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

32

Zeng, Tao, Hongyu Huang, Noriyuki Kobayashi, and Jun Li. "Performance of an Activated Carbon-Ammonia Adsorption Refrigeration System." Natural Resources 08, no. 10 (2017): 611–31. http://dx.doi.org/10.4236/nr.2017.810039.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

33

Critoph, R. E. "Activated carbon adsorption cycles for refrigeration and heat pumping." Carbon 27, no. 1 (1989): 63–70. http://dx.doi.org/10.1016/0008-6223(89)90157-7.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

34

Abdulkadir,, M. S., D. M. Kulla, and G. Y. Pam. "Performance evaluation of date-seed activated carbon as adsorbent in adsorption refrigeration system." Nigerian Journal of Basic and Applied Sciences 30, no. 1 (August 24, 2022): 24–27. http://dx.doi.org/10.4314/njbas.v30i1.3.

Повний текст джерела

Анотація:

Vapour compression refrigeration systems are characterised by relative high energy requirement in addition to environmental pollution tendencies. Adsorption refrigeration system could be a better option in terms of huge energy savings and carbon emission reduction. This study is aimed at evaluating the performance and characteristics of date-seed activated carbon (DSAC) for use as adsorbent in adsorption refrigeration. Using isoster-based adsorbent/adsorbate equilibrium test rig, pressure, temperature and concentration (P-T-X) data were obtained. The isosteric heat of adsorption for conventional activated (CAC) and DSAC are estimated to a first approximation to be 16.058 and 16.650 kJ/Kg respectively. The results showed that date-seed activated carbon has relatively good adsorptive characteristics.

Стилі APA, Harvard, Vancouver, ISO та ін.

35

Alok, Praveen, and Debjyoti Sahu. "Experimental Study on Vapor Adsorption Refrigeration System with Carbon-Methanol Pair." IOP Conference Series: Materials Science and Engineering 376 (June 2018): 012086. http://dx.doi.org/10.1088/1757-899x/376/1/012086.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

36

Wang, L. W., S. J. Metcalf, R. E. Critoph, R. Thorpe, and Z. Tamainot-Telto. "Development of thermal conductive consolidated activated carbon for adsorption refrigeration." Carbon 50, no. 3 (March 2012): 977–86. http://dx.doi.org/10.1016/j.carbon.2011.09.061.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

37

Hamamoto, Y., K. C. A. Alam, B. B. Saha, S. Koyama, A. Akisawa, and T. Kashiwagi. "Study on adsorption refrigeration cycle utilizing activated carbon fibers. Part 1. Adsorption characteristics." International Journal of Refrigeration 29, no. 2 (March 2006): 305–14. http://dx.doi.org/10.1016/j.ijrefrig.2005.04.008.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

38

Anas, N. S., Shijo Thomas, C. B. Sobhan, and G. P. Peterson. "An Experimental Investigation of the Refrigerant Adsorption Performance of Carbon Nanotube-Activated Carbon Mixtures." International Journal of Air-Conditioning and Refrigeration 25, no. 02 (April 19, 2017): 1750017. http://dx.doi.org/10.1142/s2010132517500171.

Повний текст джерела

Анотація:

The research reported here presents the results of an experimental investigation of the adsorption performance of different combinations of activated carbon and multi-walled carbon nanotubes mixtures (7.5–25%), as an adsorbent material for refrigerant R-134a, with the application potential in vapor adsorption refrigeration systems. The specific adsorbance was found to increase with the addition of carbon nanotubes to activated carbon. The experimental data were used to calculate the isosteric heat of adsorption using the Clausius–Clapeyron equation, and study its variation with the specific adsorbance for the mixture with the highest percentage of carbon nanotubes, and compare the results with that for activated carbon. The increase in the specific adsorption capacity upon addition of carbon nanotubes was interpreted as due to an increase in the pore volume, which in turn increases the specific surface area of the adsorbent material.

Стилі APA, Harvard, Vancouver, ISO та ін.

39

Liu, Zhongbao, Jiayang Gao, Xin Qi, Zhi Zhao, and Han Sun. "Experimental Study on Activated Carbon-MIL-101(Cr) Composites for Ethanol Vapor Adsorption." Materials 14, no. 14 (July 8, 2021): 3811. http://dx.doi.org/10.3390/ma14143811.

Повний текст джерела

Анотація:

In this study, the hydrothermal method was used to synthesize MIL-101(Cr), and activated carbon (AC) with different content was incorporated in to MIL-101(Cr), thereby obtaining AC-MIL-101(Cr) composite material with a huge specific surface area. The physical properties of MIL-101(Cr) and AC-MIL-101(Cr) were characterized by powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), nitrogen adsorption and desorption and specific surface area testing, and ethanol vapor adsorption performance testing. The results show that with the increase of activated carbon content, the thermal stability of AC-MIL-101(Cr) is improved. Compared with the pure sample, the BET specific surface area and pore volume of AC-MIL-101(Cr) have increased; In the relative pressure range of 0–0.4, the saturated adsorption capacity of AC-MIL-101(Cr) to ethanol vapor decreases slightly. It is lower than MIL-101(Cr), but its adsorption rate is improved. Therefore, AC-MIL-101(Cr)/ethanol vapor has a good application prospect in adsorption refrigeration systems. The exploration of AC-MIL-101(Cr) composite materials in this paper provides a reference for the future application of carbon-based/MOFS composite adsorbent/ethanol vapor working fluid in adsorption refrigeration.

Стилі APA, Harvard, Vancouver, ISO та ін.

40

Qu, T. F., W. Wang, and R. Z. Wang. "Study of the Effects of Mass and Heat Recovery on the Performances of Activated Carbon/Ammonia Adsorption Refrigeration Cycles." Journal of Solar Energy Engineering 124, no. 3 (August 1, 2002): 283–90. http://dx.doi.org/10.1115/1.1487883.

Повний текст джерела

Анотація:

Mass recovery can play an important role to better the performance of adsorption refrigeration cycles. Cooling capacity can be significantly increased with mass recovery process. The coefficient of performance (COP) of the activated carbon/ammonia adsorption refrigeration cycle might be increased or decreased with mass recovery process due to different working conditions. The advantage is that its COP is not sensitive to the variation of heat capacity of adsorber metal and condensing and evaporating temperature. The cycle with mass and heat recovery has a relatively high COP.

Стилі APA, Harvard, Vancouver, ISO та ін.

41

Halder, G., and S. C. Sarkar. "The cooling effect by an adsorption-desorption refrigeration cycle." Journal of Energy in Southern Africa 18, no. 2 (May 1, 2007): 26–30. http://dx.doi.org/10.17159/2413-3051/2007/v18i2a3370.

Повний текст джерела

Анотація:

An experiment has been carried out utilizing the activated carbon granules as an adsorbent indige-nously developed from coconut shell and carbon dioxide gas as an adsorbate in a small experimental chamber, specially designed for this purpose. Adsorption followed by removal of heat of adsorp-tion and subsequent desorption produces refrigera-tion. After a few cycles in the chamber, tempera-tures drop from 304 K to 282.5 K. Therefore, con-tinuous production of refrigeration could be achieved by a suitable mechanism. The paper describes the details of the design and fabrication of the experimental chamber, the experimental proce-dure and discusses the results obtained to assess its feasibility towards development of an alternative eco friendly refrigeration cycle for replacement of chlorofluorocarbons.

Стилі APA, Harvard, Vancouver, ISO та ін.

42

Elsheniti, M. B., H. Al-Ansary, J. Orfi, A. El-Leathy, M. S. Eissa, and O. Elsamni. "Enhancing Adsorption Ice Maker Productivity using Beds of Aluminium Foam Packed with Activated Carbon." IOP Conference Series: Earth and Environmental Science 1026, no. 1 (May 1, 2022): 012005. http://dx.doi.org/10.1088/1755-1315/1026/1/012005.

Повний текст джерела

Анотація:

Abstract The adsorption refrigeration system driven by solar energy is a promising sustainable solution to tackle the growing demand for cooling and meet environmental regulations as well. In addition, the increase in refrigeration needs is in phase with the increase in the abundant solar energy in the Middle East. This study aims at numerically investigating the utilize of a high adsorption performance material namely Maxsorb III, a type of activated carbon, packed in an advanced aluminium foam bed to produce ice from two-bed adsorption system. A detailed 2-D axisymmetric transient model considering mass, momentum, and energy balance equations coupled with isotherms and kinetic models in the adsorbent domain to describe the adsorption phenomena was developed and used for the simulations. Results of a typical packed bed using finned tube configuration were used as a base model to compare the performance enhancement. The aluminium foam-based system performance outperformed the base model in producing the ice by 16.8% at a high cycle time of 1200 s, regeneration temperature of 90°C, and foam thickness of 5 mm. Furthermore, the coefficient of performance and specific cooling power increased by 26.7% and 27.9%, respectively, driven by the considerable enhancement in the bed mass and heat transfer due to the use of metal foam.

Стилі APA, Harvard, Vancouver, ISO та ін.

43

Horikawa, Toshihide, Masanori Takenouchi, Duong D. Do, Ken-Ichiro Sotowa, J. Rafael Alcántara-Avila, and David Nicholson. "Adsorption of Water and Methanol on Highly Graphitized Thermal Carbon Black and Activated Carbon Fibre." Australian Journal of Chemistry 68, no. 9 (2015): 1336. http://dx.doi.org/10.1071/ch15134.

Повний текст джерела

Анотація:

Adsorption of water and methanol on different carbonaceous solids was carried out to investigate the roles of porous structure and functional groups on the adsorption of associating fluids. A highly graphitized thermal carbon black, non-porous Carbopack F, was chosen to study the effects of functional groups and their concentration, and two samples of porous activated carbon fibre (ACF), microporous A-5 and micro-mesoporous A-15, were used to investigate the interplay between the functional groups and confinement. On Carbopack F, adsorption of water at 298 K is not experimentally detectable until the relative pressure reaches about 0.9, and the adsorption isotherm exhibits a large hysteresis loop spanning a very wide range of pressure; by contrast methanol adsorption at the same temperature shows an onset of adsorption at a lower relative pressure of 0.2 and the isotherm has a very small hysteresis loop. This early onset, compared with water, is due to the dispersion interaction between the methyl group and the graphene surface; an interaction which is absent in water. For the porous ACF samples, the onset of water uptake shifts from a relative pressure of 0.9; as observed for Carbopack F, to the much lower values, depending on pore size, of 0.3 for microporous A-5 and 0.5 for micro-mesoporous A-15.

Стилі APA, Harvard, Vancouver, ISO та ін.

44

Ambarita, Himsar, and Hideki Kawai. "Experimental study on solar-powered adsorption refrigeration cycle with activated alumina and activated carbon as adsorbent." Case Studies in Thermal Engineering 7 (March 2016): 36–46. http://dx.doi.org/10.1016/j.csite.2016.01.006.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

45

Wang, L. W., J. Y. Wu, R. Z. Wang, Y. X. Xu, and S. G. Wang. "Experimental study of a solidified activated carbon-methanol adsorption ice maker." Applied Thermal Engineering 23, no. 12 (August 2003): 1453–62. http://dx.doi.org/10.1016/s1359-4311(03)00103-0.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

46

Kumita, Mikio, Naohiro Yamawaki, Kie Shinohara, Hidenori Higashi, Akio Kodama, Noriyuki Kobayashi, Takafumi Seto, and Yoshio Otani. "Methanol adsorption behaviors of compression-molded activated carbon fiber with PTFE." International Journal of Refrigeration 94 (October 2018): 127–35. http://dx.doi.org/10.1016/j.ijrefrig.2018.07.036.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

47

Oliveira, R. G., R. Z. Wang, and T. Xian Li. "Adsorption Characteristic of Methanol in Activated Carbon Impregnated with Lithium Chloride." Chemical Engineering & Technology 33, no. 10 (September 28, 2010): 1679–86. http://dx.doi.org/10.1002/ceat.201000075.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

48

Pinto, Samson Paul, Raghavendra Basavapatna Govindasetty, Praveen Karanam, Upendra Behera, and Srinivasan Kasthurirengan. "Study on a twin-bed adsorption refrigeration system using R134a-activated carbon pair." Heat Transfer-Asian Research 48, no. 4 (February 11, 2019): 1264–79. http://dx.doi.org/10.1002/htj.21430.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

49

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

Повний текст джерела

Анотація:

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.

Стилі APA, Harvard, Vancouver, ISO та ін.

50

Zhang, Dan. "Electrooxidation of Methanol on Carbon Supported Gold Nanoparticles." Applied Mechanics and Materials 313-314 (March 2013): 232–36. http://dx.doi.org/10.4028/www.scientific.net/amm.313-314.232.

Повний текст джерела

Анотація:

Activated carbon supported gold nanoparticles (Au/C) were prepared by a chemical reduction process using NaBH4as a reducing agent. The characterization of transmission electron microscope indicated that the Au nanoparticles (AuNPs) in the Au/C catalyst were highly well dispersed on the carbon support. The catalytic activity of the Au/C catalyst for the methanol electrooxidation (MEO) was investigated by the cyclic voltammetry (CV). The results displayed that the Au/C catalyst exhibited a favorable catalytic activity towards the MEO in alkaline solution. Moreover, the competitive adsorption between OH-and CH3OH on the surface of the AuNPs in the Au/C catalyst existed in the course of the MEO. Based on this competitive adsorption, the mechanism of the MEO on the Au/C catalyst was further investigated.

Стилі APA, Harvard, Vancouver, ISO та ін.

Статті в журналах з теми "Activated carbon; methanol; adsorption refrigeration"

Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями