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Journal articles on the topic 'Evaporater'

Author: Grafiati

Published: 4 June 2021

Last updated: 12 February 2022

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1

Trinh, Ngoc Van, Younghyeon Kim, Hongjip Kim, and Sangseok Yu. "Evaporation of Methanol Solution for a Methanol Steam Reforming System." Energies 14, no. 16 (2021): 4862. http://dx.doi.org/10.3390/en14164862.

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In a methanol-reforming system, because the mixture of methanol and water must be evaporated before reaching the reforming reaction zone, having an appropriate evaporator design is a fundamental requirement for completing the reforming reaction. This study investigates the effect of the evaporator design for the stable reforming of methanol–water mixtures. Four types of evaporator are compared at the same heat duty of the methanol-reforming system. The four evaporators are planar heat exchangers containing a microchannel structure, cylindrical shell-and-tube evaporators, zirconia balls for int

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2

Стефанюк, Вадим Володимирович. "Support for operation of system - evaporater compressor of heat-pump energy supply." Technology audit and production reserves 6, no. 1(8) (2012): 33–34. http://dx.doi.org/10.15587/2312-8372.2012.5465.

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3

Uehara, Haruo, Akio Miyara, Yasuyuki Ikegami, and Tsutomu Nakaoka. "Performance Analysis of an OTEC Plant and a Desalination Plant Using an Integrated Hybrid Cycle." Journal of Solar Energy Engineering 118, no. 2 (1996): 115–22. http://dx.doi.org/10.1115/1.2847976.

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A performance analysis of an OTEC plant using an integrated hybrid cycle (I–H OTEC Cycle) has been conducted. The I–H OTEC cycle is a combination of a closed-cycle OTEC plant and a spray flash desalination plant. In an I–H OTEC cycle, warm sea water evaporates the liquid ammonia in the OTEC evaporator, then enters the flash chamber and evaporates itself. The evaporated steam enters the desalination condenser and is condensed by the cold sea water passed through the OTEC condenser. The optimization of the I–H OTEC cycle is analyzed by the method of steepest descent. The total heat transfer area

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4

CANTRELL, JAMES G. "Black liquor evaporator upgrades— life cycle cost analysis." March 2021 20, no. 3 (2021): 208–21. http://dx.doi.org/10.32964/tj20.3.208.

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Black liquor evaporation is generally the most energy intensive unit operation in a pulp and paper manufacturing facility. The black liquor evaporators can represent a third or more of the total mill steam usage, followed by the paper machine and digester. Evaporator steam economy is defined as the unit mass of steam required to evaporate a unit mass of water from black liquor (i.e., lb/lb or kg/kg.) The economy is determined by the number of effects in an evaporator train and the system configuration. Older systems use four to six effects, most of which are the long tube vertical rising film

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5

Riadi, Indra, Zulfan Adi Putra, and Heri Cahyono. "Thermal integration analysis and improved configuration for multiple effect evaporator system based on pinch analysis." Reaktor 21, no. 2 (2021): 74–93. http://dx.doi.org/10.14710/reaktor.21.2.74-93.

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Pinch analysis for a sugar plant production capacity 4000 TCD has been carried out to reduce its energy consumptions. The plant has ten evaporators that can be configured to several multiple effect evaporators. It has been running with five-effect evaporator (quintuple) scheme. To maximize energy utilization within the plant, three multiple effect evaporator schemes were evaluated. They are triple effect evaporator, quadruple effect evaporator, and quintuple effect evaporator as the benchmark. The result shows that the quintuple effect evaporator yields the highest energy efficiency by about 1

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6

Chantasiriwan, Somchart. "Increased Energy Efficiency of a Backward-Feed Multiple-Effect Evaporator Compared with a Forward-Feed Multiple-Effect Evaporator in the Cogeneration System of a Sugar Factory." Processes 8, no. 3 (2020): 342. http://dx.doi.org/10.3390/pr8030342.

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The cogeneration system of a sugar factory consists of boiler, steam turbine, and sugar juice evaporation process. The multiple-effect evaporator used for the conventional sugar juice evaporation process is the forward-feed multiple-effect evaporator, in which steam and sugar juice flow in the same direction. The main objective of this paper is to investigate the energy efficiency of the backward-feed multiple-effect evaporator, in which steam and sugar juice flow in opposite directions, compared with that of the forward-feed multiple-effect evaporator. Mathematical models are developed for bo

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7

O’Reilly, J. M., and P. F. Monaghan. "Wind Evaporator Heat Pumps—Part II: Thermal Performance Results." Journal of Energy Resources Technology 114, no. 4 (1992): 286–90. http://dx.doi.org/10.1115/1.2905955.

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Wind evaporators are alternative evaporators for air source heat pumps which rely on wind-driven or natural convection to move air across the heat transfer surfaces. A fully automatic, computer-controlled test facility which allows side-by-side testing of wind evaporator and conventional heat pumps and monitoring of weather conditions has been designed and built at University College Galway. The aim of this paper is to quantify the advantages of wind evaporators by comparing the performance of a wind evaporator heat pump with that of a conventional heat pump over an extended testing period and

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8

Prado, G. O., A. M. M. Arouca, R. C. C. Domingues, Luiz Gustavo Martins Vieira, and João Jorge Ribeiro Damasceno. "Utilization of Solar Energy as Heat Source." Materials Science Forum 727-728 (August 2012): 114–18. http://dx.doi.org/10.4028/www.scientific.net/msf.727-728.114.

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The search for energetic alternatives and the concern about water preservation are novel ideas that challenge the humanity. This project was inspired in these challenges, being based in the utilization of solar energy for desalination of brackish water. A parabolic solar concentrator captures the solar radiation heating thermal fluid, which is closed-circuit circulated into a evaporator, which has three trays. The first has the functions of storing, pre-heating and condensing. The second works as an evaporator and the third stores the evaporated water. The system was tested with and without pu

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9

Guinn, Gerald R. "Field Test Evaluation of Solar-Heated Evaporators." Journal of Solar Energy Engineering 114, no. 3 (1992): 165–70. http://dx.doi.org/10.1115/1.2930000.

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The cost of disposal of liquid industrial waste is of intense concern to all industrial waste generators, but especially so to smaller generators which are penalized by the economy of scale. As a last resort to on-site treatment or recycling, the smaller generator is forced to depend upon commercial waste disposal at costs approaching $6.00 per gallon. The use of solar energy to evaporate water from aqueous wastes is a potentially viable alternative if the contaminants are salts having low volatility. This paper describes a field test conducted with a small solar evaporator installed in a mach

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10

Monaghan, P. F., D. P. Finn, and J. M. O’Reilly. "Wind Evaporator Heat Pumps—Part I: Test Methods." Journal of Energy Resources Technology 114, no. 4 (1992): 281–85. http://dx.doi.org/10.1115/1.2905954.

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Wind evaporators are alternative evaporators for air source heat pumps which rely on wind-driven or natural convection to move air across the heat transfer surfaces. It is believed that, in certain climates, wind evaporators can operate satisfactorily with frost on their surfaces for extended periods of time and defrost passively during switch-off periods. If so, an active defrost cycle would be unnecessary in these climates. Wind evaporators present an opportunity for heat pumps to be less expensive, more reliable, and more energy-efficient. However, the heat transfer performance of wind evap

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11

Wang, Wen, Tianfei Qu, Zhonghua Li, and Ruzhu Wang. "Application of Suction Line Heat Exchanger on Adsorption Refrigeration System." Journal of Solar Energy Engineering 126, no. 1 (2004): 671–73. http://dx.doi.org/10.1115/1.1634989.

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Quantitative thermodynamic analysis demonstrates that an adsorption refrigeration cycle could get higher cycle performance by employing a suction line heat exchanger (SLHX). Low temperature evaporated gas not only helps to cool down the adsorbent, it further increases the cooling output by recovering heat and cooling the condensed liquid. Experimental data also verifies that a SLHX recovers heat from the evaporated gas and helps the evaporator to provide higher cooling capacity.

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12

Miyatake, O., T. Tomimura, and Y. Ide. "Enhancement of Spray Flash Evaporation by Means of the Injection of Bubble Nuclei." Journal of Solar Energy Engineering 107, no. 2 (1985): 176–82. http://dx.doi.org/10.1115/1.3267673.

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Spray flash evaporators are being used or considered for power systems utilizing solar energy, ocean thermal energy, and geothermal energy. As part of an attempt to develop a compact, efficient flash evaporator, an experimental study of the effect of injection of bubble nuclei has been conducted. The bubble nuclei were generated by electrolyzing warm water, which was ejected from a simple tubular nozzle into a low-pressure vapor zone. Effects of electrolytic current level, nozzle diameter, liquid flow rate, liquid temperature, and superheat were investigated. The evaporator rates attained were

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13

Lee, Cho Han, and Yao Yang Tsai. "Measurement of Thin-Film Evaporation Heat Transfer for Evaporators with Sintered Powder Wick Structure." Advanced Materials Research 579 (October 2012): 379–86. http://dx.doi.org/10.4028/www.scientific.net/amr.579.379.

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Two-phase heat transfer devices such as heat pipes and vapor chambers are composed of an evaporator, an adiabatic section and a condenser. For the dry-out prevention and capillary purpose, adiabatic sections and evaporators are covered by wick structures. Common wick structures are grooves, mesh, sintered powder and their combination. Combining with the wick structures, the major phase change effects on evaporators are thin-film evaporation. For the research between parameters of wick structure and evaporator performance, we developed a facility to measure the heat transfer on evaporators. To

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14

Mulyanto, A., M. Mirmanto, I. G. B. Susana, I. B. Alit, and I. M. Nuarsa. "Pengeringan biji jagung menggunakan pengkondisi udara." Dinamika Teknik Mesin 9, no. 1 (2019): 65. http://dx.doi.org/10.29303/dtm.v0i0.262.

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This study aims to determine the effect of air velocity on the rate of drying corn. Corn seeds were placed after the evaporator of an air conditioner, so that the air came out of the evaporator entered the drying chamber. The water in the corn was evaporated and sucked by dry cold air and then it was condensed in the evaporator. The results show that the mass of corn seeds decreases with the time; the drying rate also decreases with the time and mass-based drying rates at low air speeds are faster than at high air speed. The air conditioner can be used for drying seeds.

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15

Белогуров, С. А. "КРИЗИС ТЕПЛООТДАЧИ В ЖИДКОМЕТАЛЛИЧЕСКИХ ИСПАРИТЕЛЯХ С СОСТАВНОЙ КАПИЛЛЯРНО-ПОРИСТОЙ СТРУКТУРОЙ В ВЫХОДНОМ СЕЧЕНИИ". Journal of Rocket-Space Technology 26, № 4 (2018): 15–19. http://dx.doi.org/10.15421/451803.

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Results of experimental research represent conditions of heat transfer deterioration for boiling potassium in a straight-through evaporator with a composite capillary-porous structure in the output section. A region of mass velocities is identified, where boundary vapor content, with heat transfer deterioration in the composite capillary-porous structure, is higher than in smooth-tube evaporators and evaporators with a simple capillary structure.

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16

Yu, Dongjin, Ngoc Trinh Van, Jinwon Yun, and Sangseok Yu. "A Thermal Design of a 1 kW-Class Shell and Tube Methanol Steam Reforming System with Internal Evaporator." Processes 8, no. 11 (2020): 1509. http://dx.doi.org/10.3390/pr8111509.

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Due to its low operating temperature, the performance of a methanol steam reformer depends on efficient thermal integration. In particular, the integration of the evaporator is crucial to enhance thermal efficiency. This paper presents two different configurations to utilize thermal energy for evaporation of methanol/water mixture. The reformer system is composed of a methanol steam reformer, a burner, and two different evaporators such as internal evaporator and external evaporator. Moreover, since the performance of the reforming system strongly depends on thermal utilization, a heat recover

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17

A. Shirkin, L., O. G. Selivanov, T. A. Trifonova, S. I. Roshchina, and M. E. Ilina. "Mathematical Model of Vacuum Evaporation Using Apparatus with Mechanical Water Vapor Recompression." International Journal of Engineering & Technology 7, no. 4.38 (2018): 1222. http://dx.doi.org/10.14419/ijet.v7i4.38.27768.

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This article presents mathematical model of evaporation of aqueous solutions of mineral salts on apparatus with mechanical recompression of water vapor and process intensification upon vacuuming. The developed mathematical model is an engineering prediction where all calculations are associated with technological flowchart of evaporator. Predictions according to the mathematical model for evaporator are exemplified for the case of 2% aqueous solution of sodium chloride evaporated to 15 wt % at distillation capacity of 30 kg/h. Engineering predictions were performed consecutively in 5 stages in

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18

Mrihardjono, Juli, Didik Ariwibowo, Sutrisno Sutrisno, and Dista Yoel Tadeus. "EFEK PENAMBAHAN EVAPORATOR PADA ATMOSPHERE WATER HARVESTER (AWH) TERHADAP PERFORMA SISTEM." Gema Teknologi 21, no. 2 (2021): 74–80. http://dx.doi.org/10.14710/gt.v21i2.33448.

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Atmosphere Water Harvester (AWH) was investigated to get water collected from air in elevated performance. Improvement was performed by introducing a series-arrangement of two evaporators. Air flew through the evaporators in cross-flow. This arrangement would influence performance of the AWH system in title of COP, MHI, and specific energy consumption. The AWH was designed using vapor compression refrigeration system. Parameter measured to the system were refrigerant temperature in suction and discharge line, inlet and outlet pipe wall temperatures at evaporator and condenser, air velocity ent

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19

Pektezel and Acar. "Energy and Exergy Analysis of Combined Organic Rankine Cycle-Single and Dual Evaporator Vapor Compression Refrigeration Cycle." Applied Sciences 9, no. 23 (2019): 5028. http://dx.doi.org/10.3390/app9235028.

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This paper presents energy and exergy analysis of two vapor compression refrigeration cycles powered by organic Rankine cycle. Refrigeration cycle of combined system was designed with single and dual evaporators. R134a, R1234ze(E), R227ea, and R600a fluids were used as working fluids in combined systems. Influences of different parameters such as evaporator, condenser, boiler temperatures, and turbine and compressor isentropic efficiencies on COPsys and ƞex,sys were analyzed. Second law efficiency, degree of thermodynamic perfection, exergy destruction rate, and exergy destruction ratio were d

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20

Amirfakhraei, Amirhossein, Jamshid Khorshidi, and Taleb Zarei. "A thermodynamic modeling of 2-bed adsorption desalination to promote main equipment performance." Journal of Water Reuse and Desalination 11, no. 1 (2021): 136–46. http://dx.doi.org/10.2166/wrd.2021.059.

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Abstract Adsorption desalination utilizes the discrete adsorption of the water vapor from the evaporator, and is capable of being discharged to the condenser. This study illuminated an advanced cycle of mass and heat recovery among beds, condensers, and evaporators. Morover, the thermodynamic modeling of adsorption desalination systems (ADS) under different operating conditions was investigated. Furthermore, its effect on the evaporator vapor production and the water vapor adsorption and desorption in the adsorption beds were accounted for. Parenthetically, the mathematical model of ADS thermo

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21

Zhang, Li Xi, Li Xi Zhang, and He Fei Zhang. "Analysis of a Triple-Effect Low Temperature Distillation Desalination Process." Advanced Materials Research 204-210 (February 2011): 2001–6. http://dx.doi.org/10.4028/www.scientific.net/amr.204-210.2001.

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A new process of low temperature triple-effect distillation desalination is designed. Firstly, the appropriate effect number is determined. The total heat transfer coefficients and the heat loads of each evaporator are calculated. When the pressure differences between near effects are equal to △P, the freshwater outputs and the heat transfer coefficients of every effect would be increased as △P improved; if △P is too low, the seawater un-evaporated in the last evaporator would be difficult to flow into the next one. By analysis, the appropriate value of △P is 0.005 MPa. If the seawater flowing

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22

Hung, Kuo-Shu, Jenn-Chyi Chung, Chung-Che Liu, Jun-Jie Lin, and Chi-Chuan Wang. "A Comparative Study of the Oil-Free Centrifugal Water Chillers with the Flooded or Falling Film Evaporator—A Case Study." Energies 12, no. 13 (2019): 2548. http://dx.doi.org/10.3390/en12132548.

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A comparative study regarding the performance of real-scale oil-free centrifugal chillers having the flooded evaporator or falling film evaporator was conducted in this study. The nominal capacity for the test chillers was around 200~230 USRT (US refrigeration ton) (703~809 kW). The compressors of the two chillers were identical and R-134a was used as the working fluid. Both evaporators employed the same enhanced tubes (GEWA-B) to fulfill phase change. Tests were conducted in full, 75%, 50%, and 25% loading. Test results indicate that both chillers contained a comparable system performance wit

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Krapivin, Mkrtchyan, and Rochon. "Hydrological Model for Sustainable Development in the Aral Sea Region." Hydrology 6, no. 4 (2019): 91. http://dx.doi.org/10.3390/hydrology6040091.

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Possible scenarios of the Aral Sea crisis solution are discussed, and a new scenario is proposed. Previous scenarios have provided for the transfer of water from Siberian Rivers to Central Asia and the restriction of unsustainable expansion of irrigation in this region. The scenario proposed in this paper is partly based on the use of Caspian water evaporators located on the eastern coast of the Caspian Sea. Engineering realization of this scenario needs only the construction of the drainage system for the runoff of Caspian waters to the natural evaporators, between which Kara-Bogaz-Gol is the

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24

Santos, Paulo, Thiago Alves, Amir Oliveira, and Edson Bazzo. "Analysis of a flat capillary evaporator with a bi-layered porous wick." Thermal Science 24, no. 3 Part B (2020): 1951–62. http://dx.doi.org/10.2298/tsci180419240s.

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A numerical evaluation of the heat and mass transfer concerning a flat capillary evaporator provided by a bi-layered porous wick is presented. The wick has a shape of a flat disc and is assembled between the liquid feeding channel and the vapor chamber. An external heat input is applied into the upper surface of the bi-layered wick, where the working fluid evaporates. The mass and heat transfer are modeled using the mass and energy conservation equations. The model allows to verify the effect of design variables, such as working fluids, dimensions, permeability, average pore radius and thermal

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25

Rogié, Brice, Jonas Kjær Jensen, Svenn Ole Kjøller Hansen, and Wiebke Brix Markussen. "Analysis of Cold Air Recirculation in the Evaporators of Large-Scale Air-Source Heat Pumps Using CFD Simulations." Fluids 5, no. 4 (2020): 186. http://dx.doi.org/10.3390/fluids5040186.

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The present study investigates cold air recirculation in the evaporators of large-scale air-source heat pumps. A case study considered a 5 MW air-source heat pump producing heat for district heating. The heat pump comprises 20 horizontal evaporators, where each evaporator is equipped with eight fans. The evaporators were implemented in a CFD model, where the influence of the outdoor wind direction on the recirculation was investigated. Firstly, the air recirculation was analysed with no surrounding obstacles. Secondly, the surrounding building and the real ground topology was included in the C

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26

Hermes, Christian J. L., Joel Boeng, Diogo L. da Silva, Fernando T. Knabben, and Andrew D. Sommers. "Evaporator Frosting in Refrigerating Appliances: Fundamentals and Applications." Energies 14, no. 18 (2021): 5991. http://dx.doi.org/10.3390/en14185991.

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Modern refrigerators are equipped with fan-supplied evaporators often tailor-made to mitigate the impacts of frost accretion, not only in terms of frost blocking, which depletes the cooling capacity and therefore the refrigerator coefficient of performance (COP), but also to allow optimal defrosting, thereby avoiding the undesired consequences of condensate retention and additional thermal loads. Evaporator design for frosting conditions can be done either empirically through trial-and-error approaches or using simulation models suitable to predict the distribution of the frost mass along the

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27

Zavargo, Zoltan, Aleksandar Jokic, Bojana Prodanic, Jasna Grbic, and Rada Jeftic-Mucibabic. "Performance of falling film plate evaporators in reconstructed multiple-effect evaporation station in sugar factory." Thermal Science 10, no. 4 (2006): 55–61. http://dx.doi.org/10.2298/tsci0604055z.

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General trend of free trade in regional level as well as in the direction of European Union has motivated sugar factories located in Serbia to invest into technologies that are more efficient in order to make their products more competitive at the markets in Europe. The aim of this work was to evaluate effects of falling film plate evaporators on the energy consumption of evaporation plant, as well as to validate performance of this type of evaporators. It was found that this type of evaporator decreased energy requirements and in the same time evaporation process was more effective due to hig

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28

Singh, Hansi K. A., Cecilia M. Bitz, Aaron Donohoe, Jesse Nusbaumer, and David C. Noone. "A Mathematical Framework for Analysis of Water Tracers. Part II: Understanding Large-Scale Perturbations in the Hydrological Cycle due to CO2 Doubling." Journal of Climate 29, no. 18 (2016): 6765–82. http://dx.doi.org/10.1175/jcli-d-16-0293.1.

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Abstract The aerial hydrological cycle response to CO2 doubling from a Lagrangian, rather than Eulerian, perspective is evaluated using information from numerical water tracers implemented in a global climate model. While increased surface evaporation (both local and remote) increases precipitation globally, changes in transport are necessary to create a spatial pattern where precipitation decreases in the subtropics and increases substantially at the equator. Overall, changes in the convergence of remotely evaporated moisture are more important to the overall precipitation change than changes

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29

Orlova, Evgenija, and Dmitriy Feoktistov. "Measurement of Liquid Droplet Evaporation Rate under the Conditions of Intense Heating." Applied Mechanics and Materials 698 (December 2014): 603–8. http://dx.doi.org/10.4028/www.scientific.net/amm.698.603.

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This paper presents an experimental study of the evaporation of a sessile water-sodium chlorides solution drop to open atmosphere on the solid substrate (anodized aluminum) under the varying heat flux. The main parameters defining drop profile, i. e., contact diameter, contact angle, and height of the drop have been obtained. Specific evaporation rate has been calculated. According to the data analysis it was found, that the sessile water-sodium chlorides solution drop with the highest concentration (16.7%) evaporates in the "reverse depinning" mode. So, there is movement of the contact line i

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30

Wadell, Robert, Yogendra K. Joshi, and Andrei G. Fedorov. "Experimental Investigation of Compact Evaporators for Ultralow Temperature Refrigeration of Microprocessors." Journal of Electronic Packaging 129, no. 3 (2007): 291–99. http://dx.doi.org/10.1115/1.2753919.

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Microprocessor performance can be significantly improved by lowering the junction temperature, especially down to the deep subambient levels. This provides the strong motivation for the current study, which focuses on the design and thermohydraulic performance evaluation of high heat flux evaporators suitable for interfacing the microprocessor chip with a cascaded R134a∕R508b vapor compression refrigeration system at −80°C. Four compact evaporator designs are examined—a base line slit-flow structure with no microfeatures, straight microchannels, an inline pin fin array, and an alternating pin

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Yamin, Iqbal, Bambang Sugiarto, Setia Abikusna, and Dedi Suntoro. "The use of low grade bio ethanol as fuel mixer in gasoline engine with optimization compact distillator." E3S Web of Conferences 67 (2018): 02004. http://dx.doi.org/10.1051/e3sconf/20186702004.

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Limited fossil energy resources need to encourage renewable energy development and energy conservation it is called green energy development. One of the alternative energy sources used are bioethanol, from low grade is converted into high grade through distillation process with distillator compact that will be used as a mixture of gasoline. Tests compact distillator consisting of evaporator Indonesia Kampus, separator, and condenser by utilizing exhaust gas to heat distillator already filled with low grade bioethanol, so the heat transfer occurs on the surface of the exhaust into the evaporato

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32

Tahir, Furqan, Abdelnasser Mabrouk, Sami G. Al-Ghamdi, et al. "Sustainability Assessment and Techno-Economic Analysis of Thermally Enhanced Polymer Tube for Multi-Effect Distillation (MED) Technology." Polymers 13, no. 5 (2021): 681. http://dx.doi.org/10.3390/polym13050681.

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Metal-alloys tubes are used in the falling-film evaporator of the multi-effect distillation (MED) that is the dominant and efficient thermal seawater desalination process. However, the harsh seawater environment (high salinity and high temperature) causes scale precipitation and corrosion of MED evaporators’ metal tubes, presenting a serious technical challenge to the process. Therefore, the metal/metal alloys used as the material of the MED evaporators’ tubes are expensive and require high energy and costly tube fabrication process. On the other hand, polymers are low-cost, easy to fabricate

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Li, Chao-Jen, Jiung-Horng Lin, and Chin-Chia Su. "Heat Transfer in the Evaporators of a Double-Evaporator Refrigerating System." Heat Transfer Engineering 27, no. 8 (2006): 16–24. http://dx.doi.org/10.1080/01457630600793947.

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Oliveira, R. N., R. V. M. Reis, R. N. N. Koury, and L. Machado. "TRANSIENT MODEL OF A STATIC EVAPORATOR FOR AN AIR-WATER HEAT PUMP." Revista de Engenharia Térmica 10, no. 1-2 (2011): 07. http://dx.doi.org/10.5380/reterm.v10i1-2.61944.

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The increasing demand of electric energy in Brazil, allied to the great consumption in rush hour, has stimulated the study of water heating systems that substitute the electric shower. One of these equipments, the solar collector, is the most viable, with the best cost-benefits relation, because Brazil is a tropical country. A heat pump can be used as a support to solar collectors in places where the climatic conditions and/or the lack of available area of solar collection limit the use of the system. One way to improve this heat pump would be the substitution of its conventional evaporator fo

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Zabet, Ion, and Gratiela Maria Tarlea. "Mathematical Simulation of the Thermodynamic Processes Associated with the Vapour-Injected Scroll Compressor." E3S Web of Conferences 111 (2019): 06057. http://dx.doi.org/10.1051/e3sconf/201911106057.

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Both the major energetic crisis and the global warming, which influence the worldwide economy and the future of the society, determine the development of energetic and ecological performances of both the refrigeration equipment and air conditioning systems. Thus, there is a worldwide supported effort made in order to decrease the carbon dioxide emissions resulted from the burning of fossil fuels and the other greenhouse effect gas emissions. This article presents a refrigeration system design model using a vapour injection scroll compressor and tube in tube evaporators working with refrigerant

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Sahlan, Muhamad, Andhika Akhmariadi, Diah Kartika Pratami, Heri Hermansyah, and Anondho Wijanarko. "Scale Up Production Indonesian Liquid Propolis From Raw Propolis and Wild Beehive Using Bubbling Vacuum Evaporator." MATEC Web of Conferences 248 (2018): 04001. http://dx.doi.org/10.1051/matecconf/201824804001.

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The process of production propolis on a laboratory scale using a rotary evaporator with capacity one liter of ethanol extract propolis include propylene glycol as solvent medium. Ethanol is evaporated at a temperature of 65°C and reduced water content at 80°C. For the quantity of products can be increased by increasing the capacity of the ethanol extract of propolis and the medium while solvent evaporation to 12 liters and modify the rotary system with a bubbling system (bubbling vacuum evaporator). Then the solvent medium used was replaced with glycerol. The result of 8.02 kg of raw propolis

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Jebson, R. Selwyn, and Mani Iyer. "Performances of falling film evaporators." Journal of Dairy Research 58, no. 1 (1991): 29–38. http://dx.doi.org/10.1017/s0022029900033483.

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SummaryThe performances of falling film evaporators used in the New Zealand dairy industry for concentrating skim milk, whole milk and buttermilk were evaluated by determining (1) the kg steam used per kg water evaporated, and (2) the heat transfer coefficient of each pass in the evaporators. A computer program was used to calculate the results. The heat transfer coefficients varied from 0·3 to 3·2 kW/m2 per °C and the steam consumption from 0·4 to 0·09 kg steam/kg evaporation. The viscosity of the feed and the momentum of the vapours passing down the tubes were found to be the main factors co

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Ozturk, Recep, and Ahmet Dursun Alkan. "Determination of Optimum Heat Transfer Area for Vacuum Evaporators in Ships." Marine Technology and SNAME News 41, no. 01 (2004): 17–21. http://dx.doi.org/10.5957/mt1.2004.41.1.17.

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In ships, utility water can be produced from seawater through a vacuum evaporator instead of supplying from ports, and this solution will certainly allow extra load capacity for ships. In this application, the size of vacuum evaporators and their heat transfer areas are significant factors in terms of investment costs and the volume or weight capacity, which for ships are particularly important parameters. In the present research, the change of heat transfer areas of vacuum evaporators that are used to produce utility water was analyzed with respect to design parameters and the results from th

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Enayatollahi, Hamid, Paul Sapin, Chinedu K. Unamba, Peter Fussey, Christos N. Markides, and Bao Kha Nguyen. "A Control-Oriented ANFIS Model of Evaporator in a 1-kWe Organic Rankine Cycle Prototype." Electronics 10, no. 13 (2021): 1535. http://dx.doi.org/10.3390/electronics10131535.

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This paper presents a control-oriented neuro-fuzzy model of brazed-plate evaporators for use in organic Rankine cycle (ORC) engines for waste heat recovery from exhaust-gas streams of diesel engines, amongst other applications. Careful modelling of the evaporator is both crucial to assess the dynamic performance of the ORC system and challenging due to the high nonlinearity of its governing equations. The proposed adaptive neuro-fuzzy inference system (ANFIS) model consists of two separate neuro-fuzzy sub-models for predicting the evaporator output temperature and evaporating pressure. Experim

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Wang, Zheng Yong, Yu Qing Zhao, Zhi Yong Li, et al. "Experiment Research on Industrial Saline Wastewater Treatment Base on Evaporative Concentration Method." Applied Mechanics and Materials 522-524 (February 2014): 686–89. http://dx.doi.org/10.4028/www.scientific.net/amm.522-524.686.

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For rational utilization of industrial wastewater containing salt, this paper puts forward a method to evaporate and concentrate salty water by applicating no padding evaporative cooling tower. This paper has established a testing bench of evaporation and concentration of salt-containing wastewater and fresh water recovery system. The actual operating characteristic of the testing bench is also tested. Tests showed that evaporated quantity of water of the system ranged from 1.8 to 2.2t/h under the conditions of salt water inlet temperature between 30°C and 40°C.It proves that the proposed salt

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Maya Maharani, Dewi, Rini Yulianingsih, Shinta Rosalia Dewi, Yusron Sugiarto, and Dina Wahyu Indriani. "PENGARUH PENAMBAHAN NATRIUM METABISULFIT DAN SUHU PEMASAKAN DENGAN MENGGUNAKAN TEKNOLOGI VAKUM TERHADAP KUALITAS GULA MERAH TEBU." Jurnal Agritech 34, no. 04 (2015): 365. http://dx.doi.org/10.22146/agritech.9430.

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Brown sugar as sucrose is derived from evaporated sugar cane molasses. Evaporation is the foodstuffs’ process which is commonly used during the manufacture of sugar cane. This process evaporates the sugar cane molasses to produce concentrate. This research was aimed to assess the influence of sodium metabisulphite against physical and chemical properties of sugar cane using vacuum evaporator. In other hand, this reserach examined the influence of temperature on vacuum evaporator for chemical and physical properties of sugar cane. Sugar cooking was done at -700 mmHg below atmospheric pressure,

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Astuti, Fina Andika Frida, and Arif Rochman Fachrudin. "PENGARUH PANJANG KONDENSOR TERHADAP KINERJA TERMAL THERMOSYPHON." INFO-TEKNIK 20, no. 2 (2020): 181. http://dx.doi.org/10.20527/infotek.v20i2.7714.

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Cooling is an important activity in maintaining a large temperature of a component, both mechanical components and electronic components. Component temperature which is maintained from overheating will avoid damage. The cooling process is carried out by moving the heat produced by a component through a heat exchanger. One effective heat exchanger is Thermosyphon. This tool is able to move a number of heat through a very small surface area. Thermosyphon is a pipe that contains a working fluid, consisting of three parts, namely the evaporator section, the adiabatic section and the condenser sect

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Wainaina, Patrick, Musa Njue, and Wilson Ogola. "Numerical model to optimize the refrigerant charge for maximum refrigeration capacity." Thermal Science 17, no. 4 (2013): 989–95. http://dx.doi.org/10.2298/tsci110428081w.

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Refrigeration systems require optimal amount of refrigerant for maximum system performance. Undercharged or overcharged systems experience reduced efficiency and accessories deterioration. Optimal amount of refrigerant to be charged in a refrigeration system depends on the physical and thermal dynamic properties of the evaporator and the refrigerant. This paper presents formulation of a numerical model that can be used in determination of optimal amount of refrigerant charged in a system for maximum cooling rate as hence maximum system performance. Rayleigh?s method of dimensional analysis was

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Hassan, Mohamed, Morris Dahlinger, Jürgen R. Köhler, Renate Zapf-Gottwick, and Jürgen H. Werner. "Unified Model for Laser Doping of Silicon from Precursors." Materials 14, no. 9 (2021): 2322. http://dx.doi.org/10.3390/ma14092322.

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Laser doping of silicon with the help of precursors is well established in photovoltaics. Upon illumination with the constant or pulsed laser beam, the silicon melts and doping atoms from the doping precursor diffuse into the melted silicon. With the proper laser parameters, after resolidification, the silicon is doped without any lattice defects. Depending on laser energy and on the kind of precursor, the precursor either melts or evaporates during the laser process. For high enough laser energies, even parts of the silicon’s surface evaporate. Here, we present a unified model and simulation

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Lubis, Misri Yanty, Rikson Siburian, Lamek Marpaung, Partomuan Simanjuntak, and Muhammad Pandapotan Nasution. "METHYL GALLATE FROM JIRINGA (ARCHIDENDRON JIRINGA) AND ANTIOXIDANT ACTIVITY." Asian Journal of Pharmaceutical and Clinical Research 11, no. 1 (2018): 346. http://dx.doi.org/10.22159/ajpcr.2017.v11i1.21637.

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Objective: This research was study about phytochemical active phenolic compound from pods of jiringa (Archidendron jiringa (Jack) I. C. Nielsen) and it’s antioxidant.Methods: Pods of jiringa were air dried and macerated with methanol. Extract was evaporated using rotary evaporator, and then, crude extract dissolved with water and partitioned with ethyl acetate. Extracts were evaporated and partitioned again with methanol and n-hexane. Column and preparative chromatography used to separate pure compound. Pure compound as methyl gallate was identificated with data from nuclear magnetic resonance

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Lubis, Misri Yanty, Rikson Siburian, Lamek Marpaung, Partomuan Simanjuntak, and Muhammad Pandapotan Nasution. "METHYL GALLATE FROM JIRINGA (ARCHIDENDRON JIRINGA) AND ANTIOXIDANT ACTIVITY." Asian Journal of Pharmaceutical and Clinical Research 11, no. 1 (2018): 346. http://dx.doi.org/10.22159/ajpcr.2018.v11i1.21637.

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Objective: This research was study about phytochemical active phenolic compound from pods of jiringa (Archidendron jiringa (Jack) I. C. Nielsen) and it’s antioxidant.Methods: Pods of jiringa were air dried and macerated with methanol. Extract was evaporated using rotary evaporator, and then, crude extract dissolved with water and partitioned with ethyl acetate. Extracts were evaporated and partitioned again with methanol and n-hexane. Column and preparative chromatography used to separate pure compound. Pure compound as methyl gallate was identificated with data from nuclear magnetic resonance

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47

Zhuang, Pengyu, Hanyu Fu, Ning Xu, Bo Li, Jun Xu, and Lin Zhou. "Free-standing reduced graphene oxide (rGO) membrane for salt-rejecting solar desalination via size effect." Nanophotonics 9, no. 15 (2020): 4601–8. http://dx.doi.org/10.1515/nanoph-2020-0396.

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AbstractInterfacial solar vapor generation has revived the solar-thermal-based desalination due to its high conversion efficiency of solar energy. However, most solar evaporators reported so far suffer from severe salt-clogging problems during solar desalination, leading to performance degradation and structural instability. Here, we demonstrate a free-standing salt-rejecting reduced graphene oxide (rGO) membrane serving as an efficient, stable, and antisalt-fouling solar evaporator. The evaporation rate of the membrane reaches up to 1.27 kg m−2 h−1 (solar–thermal conversion efficiency ∼79%) u

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Ust, Y., A. Sinan Karakurt, and U. Gunes. "Performance Analysis of Multipurpose Refrigeration System (MRS) on Fishing Vessel." Polish Maritime Research 23, no. 2 (2016): 48–56. http://dx.doi.org/10.1515/pomr-2016-0020.

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Abstract The use of efficient refrigerator/freezers helps considerably to reduce the amount of the emitted greenhouse gas. A two-circuit refrigerator-freezer cycle (RF) reveals a higher energy saving potential than a conventional cycle with a single loop of serial evaporators, owing to pressure drop in each evaporator during refrigeration operation and low compression ratio. Therefore, several industrial applications and fish storage systems have been utilized by using multipurpose refrigeration cycle. That is why a theoretical performance analysis based on the exergetic performance coefficien

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Voronovych, Daniil, Anatoliy Taran, Natalya Shitsevalova, Ganna Levchenko, and Volodymyr Filipov. "Thermal Instability of Holmium and Thulium Dodecaborides in Vacuum." Solid State Phenomena 257 (October 2016): 152–55. http://dx.doi.org/10.4028/www.scientific.net/ssp.257.152.

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There are studied the HoB12 → HoB4 and TmB12 → TmB4 phase transformations on annealing of the corresponding dodecaborides single crystals up to 1814 K in vacuum . It is shown that at p < 10-4 Pa the HoB12 → HoB4 phase transformation takes place on the HoB12 surface because of preferential boron evaporation from dislocations outcrops. TmB12 evaporates congruently and at p < 10-4 Pa its phase composition remains unchanged. At pressure p ≥ 10-2 Pa intensification of surface bombardment by ions of the residual gases and evaporated boron ions takes place. The ion bombardment is a contributing

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Yu, Tian Lan, Tian Xiang Yu, De Qi Peng, et al. "Research on Energy-Saving Technology for Salt Solution Heat Pump Evaporators." Applied Mechanics and Materials 331 (July 2013): 216–21. http://dx.doi.org/10.4028/www.scientific.net/amm.331.216.

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Aiming at increasing the energy-saving efficiency of salt solution evaporation, the effect of several factors on heat pump energy-saving efficiency is studied through theoretical analyses and calculation. The factors include boiling point elevation caused by solution static pressure, superheat loss of surface evaporation, temperature difference loss caused by fouling. The conclusions are that falling-film evaporator helps improve heat pump evaporation energy-saving the most and forms the fluctuating flow of the falling film which can be used to remove fouling automatically. The Φ38mm×2mm singl

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