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Journal articles on the topic 'Freoner'

Author: Grafiati

Published: 4 June 2021

Last updated: 18 February 2022

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1

Sokolov, M. I., and Yu V. Kozhukhov. "Investigation of applicability of Peng–Robinson and GERG-2008 equations of state of real gas for calculating properties of Freons for refrigeration machines and compressors." Omsk Scientific Bulletin. Series Aviation-Rocket and Power Engineering 5, no. 1 (2021): 34–43. http://dx.doi.org/10.25206/2588-0373-2021-5-1-34-43.

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A study of real gas state equations Peng–Robinson and GERG-2008 with respect to calculation of Freons R404A, R408A and R410A has been carried out. Four Freon parameters are calculated during the study: saturated vapor pressure at the saturation line at some Freon temperature, Freon density at saturation pressure and some temperature, enthalpy and entropy at the same pressures and temperature. The data obtained from the calculation of Freon by the above equations are compared with the experimental data for each of the above Freons. As a result of this work, data have been obtained to evaluate the accuracy of the Peng–Robinson and GERG-2008 equations of state for each of the three CFCs, to evaluate the effectiveness of these equations, and to provide recommendations for the calculation and application of these equations in the design and mathematical modelling of refrigeration machines

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2

Kirsanov, Mykhailo, Inna Diakun, Vitalii Ruban, Viktor Skosyriev, and Oleksandr Zhevzhyk. "Estimation of usage efficiency of freon-steam turbines in mine energy complexes." E3S Web of Conferences 168 (2020): 00048. http://dx.doi.org/10.1051/e3sconf/202016800048.

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Increase of operating efficiency of mine energy complexes is an actual scientific and technical problem. Systems that utilize energy of low-potential sources and have freon-steam turbines are suggested to be included in mine energy complexes. Principles of selection of freons as working fluids in energy systems are suggested in the paper. Usage of some thermal equations of state for defining thermal and physical properties of freons is analyzed. Equation of isentropic process for the thermal Redlich–Kwong equation of state is obtained. Calculation of energy efficiency of a system with a freon-steam turbine for selected variants of usage of working fluids is performed. A calculation method of thermodynamic parameters that are necessary for energy conversion efficiency estimation of specific freons in a system of useful utilization of energy is developed. Analysis of results indicates that usage of ozone-safe and fire-safe freons in energy utilization systems of low-potential sources with a possibility of utilization of additional waste heat, which was not used in the past, allows increasing the operating efficiency of mine energy complexes.

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3

Букин, Владимир Григорьевич, Vladimir Grigorievich Bukin, Александр Букин, and Aleksandr Bukin. "Studying heat transfer in freon-oil mixture boiling in evaporator tubes in ship refrigerating units." Vestnik of Astrakhan State Technical University. Series: Marine engineering and technologies 2019, no. 4 (November 15, 2019): 82–88. http://dx.doi.org/10.24143/2073-1574-2019-4-82-88.

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The paper describes small-capacity irrigation evaporators that improve the performance of a refrigeration unit, as they exclude the release of liquid freon into the compressor suction pipe under sharp increasing of heat load or during ship rolling. The relevance of studying heat transfer at freons boiling in a moving film has been proved. The results and analysis of experimental data on average heat transfer coefficients are presented. The graph shows the dependence of the average heat transfer coefficients on the heat flux density at various irrigation densities. There are presented the results of special experiments determining the effect of irrigation density on heat transfer. It has been stated that the effect of pressure or saturation temperature in the modes of evaporation and developed boiling manifests itself in different ways. With developed boiling, the beam pitch does not have a significant effect on heat transfer. The experiments were carried out on two stands: small-row and multi-row. The pipes were heated with an internal electric heater. It has been inferred that heat transfer in the film is more intense than in volume, therefore, smooth steel pipes can be used in irrigation evaporators instead of finned copper tubes, which are used in flooded devices. The boiling process in a film can be described by equations valid for a large volume, taking into account quantitative differences. The values of a constant coefficient and the criteria exponents are given; the similarity equation for the regime of developed bubble boiling of freons is derived. The calculated dependencies can be applied in evaluating the operation of irrigation evaporators of ship refrigeration units.

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4

Bhaskar, Hemlata, and Rekha Chaudhary. "Vitamin B12 Deficiency due to Chlorofluorocarbon: A Case Report." Case Reports in Medicine 2010 (2010): 1–3. http://dx.doi.org/10.1155/2010/691563.

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Background. Vitamin B12 is vital for optimal functioning of various organ systems but more importantly the central nervous system and the hematological system. Deficiency of vitamin B12 clinically manifests as excessive daytime fatigue, memory difficulties, encephalopathy, myelopathy, peripheral neuropathy, and optic neuropathy. In occupational medicine, vitamin B12 deficiency has been reported with exposure to nitrous oxide in health care workers. However, not much is known about exposure to Freons in other industries and vitamin B12 deficiency.Aim. We are reporting a case of vitamin B12 deficiency in the setting of exposure to chlorofluorocarbon (CFC) gases.Case Report. A 55-year-old male refrigerator mechanic experienced recurrent visual symptoms, which included diplopia and blurring. A complete workup was done and was significant of vitamin B12 deficiency. However, his B12 levels were refractory to supplementation. Appropriate precautions at workplace improved patient's symptoms and were associated with significant improvement in B12 levels.Conclusion. To the best of our knowledge, this is the first reported case of vitamin B12 deficiency (that remains refractory to supplementation) in the setting of exposure to Freon gases.

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5

N.N., Dekhkanova, and Marupova M.A. "Freons, Environmental Aspects And Classification In СN FEA." American Journal of Applied sciences 03, no. 04 (April 29, 2021): 91–97. http://dx.doi.org/10.37547/tajas/volume03issue04-12.

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The article provides data on the history, types, physicochemical properties of freons, applications, ozone-depleting substances, their importance in the economy, their place in the СN FEA as goods and classification problems in the commodity nomenclature.

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6

Porutchikov, Artem Frolovich, and Dmitriy Pavlovich Trubin. "Low temperature vacuum sublimation refrigerators on carbon dioxide as working fluid." MATEC Web of Conferences 324 (2020): 02004. http://dx.doi.org/10.1051/matecconf/202032402004.

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The paper presents the results of theoretical and experimental analysis of a vacuum-freeze-drying refrigeration machine based on carbon dioxide. Such refrigeration machines can be equipped with refrigerators for the needs of medicine, where low temperatures are widely in demand in the range from minus 80 degrees Celsius to minus 130 degrees Celsius. The problem of developing alternative refrigeration machines is dictated by modern environmental requirements for working substances, which are gradually being tightened and soon the use of familiar freons will become impossible. For the air conditioning and commercial refrigeration industry, new substances are being actively developed, such as hydrofluoroolefins (HFOs), hydrocarbons can also serve as substitutes for hydrofluorocarbons and their mixtures, but it must be considered that they are combustible and explosive. A carbon dioxide vacuum sublimation unit may be an alternative to modern freon vapor compression refrigeration units for the indicated temperature range, but subject to comparable energy costs during its operation. The article examined the three-stage and four-stage cycles of a vacuum-freeze-drying refrigeration machine, conducted their theoretical comparison in terms of COP with a cascade cycle on hydrocarbon working substances. It can be noted that the COP of the considered cycles are close, but the environmental friendliness, safety and non-combustibility of carbon dioxide gives the advantages of a vacuum freeze-drying refrigeration machine.

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7

Furnas, David W. "FREON 114." Plastic and Reconstructive Surgery 86, no. 2 (August 1990): 382. http://dx.doi.org/10.1097/00006534-199008000-00048.

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8

Sinopalnikov, A. I., I. L. Klyachkina, and M. B. Mironov. "Beclason ECO Easy Breathe: new possibilities of known drug in treatment of asthma." PULMONOLOGIYA, no. 1 (February 28, 2005): 66–72. http://dx.doi.org/10.18093/0869-0189-2005-0-1-66-72.

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An open comparative trial was designed to compare clinical efficacy of beclomethasone dipropionate (BDP) via non-freon metered dose inhaler (MDI) Easy Breathe or freon-containing MDI. The trial involved 30 patients not younger than 18 yrs with stable moderate to severe bronchial asthma (BA). The length of the disease exceeded 12 months and duration of previous therapy with inhaled steroids (freon-containing BDP) 1 000 to 1 500 mcg daily was at least 4 months. The trial duration was 6 months. The patients were randomised into 2 groups, 15 patients in each. Clinical signs, peak expiratory flow rate, need in short-acting β2-agonists were monitored. The study group patients were given non-freon BDP (Easy Breathe) instead of freon-containing BDP in the ratio 1 : 1. The control group patients continued treatment with freon-containing BDP. Then BDP daily doses were gradually reduced in both the groups while BA was controlled adequately. The daily dose was reduced by 500 mcg in average in 11 of 15 (73.3 %) non-freon BDP patients and in 6 (40 %) freon-containing BPD patients. So, BDP via MDI ECO Easy Breathe allows moderate to severe BA to be controlled with lower doses of the drug. This reduces a cost of the therapy, rate of potential adverse effects and results in improvement of quality of life of the patients.

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9

Kemnitz, Erhard, Dieter Hass, and Andreas Kohne. "Gaschromatographische Bestimmung der Adsorptionsisothermen von C1-Freonen an Chromium (III) -oxid." Zeitschrift für Chemie 29, no. 9 (August 31, 2010): 348–50. http://dx.doi.org/10.1002/zfch.19890290927.

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10

Turner, Stephen E., and David R. Dowling. "Acoustic precondensation phenomena in freons." Journal of the Acoustical Society of America 97, no. 2 (February 1995): 1014–18. http://dx.doi.org/10.1121/1.412213.

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11

Ducass??, J. L., CI Cabot, D. Calmes, and M. Fabre. "BP42. Freon poisoning." European Journal of Emergency Medicine 5, no. 1 (March 1998): 187. http://dx.doi.org/10.1097/00063110-199803000-00213.

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12

Ducass??, J. L., CI Cabot, D. Calmes, and M. Fabre. "BP42. Freon poisoning." European Journal of Emergency Medicine 5, no. 1 (March 1998): 187. http://dx.doi.org/10.1097/00063110-199803000-00214.

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13

Morton, William E. "Freon and Hypertension." JAMA: The Journal of the American Medical Association 268, no. 12 (September 23, 1992): 1540. http://dx.doi.org/10.1001/jama.1992.03490120054022.

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14

Morton, W. E. "Freon and hypertension." JAMA: The Journal of the American Medical Association 268, no. 12 (September 23, 1992): 1540–41. http://dx.doi.org/10.1001/jama.268.12.1540.

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15

Heath, Taliver, Ana Paula Centeno, Pradeep George, Luiz Ramos, Yogesh Jaluria, and Ricardo Bianchini. "Mercury and freon." ACM SIGOPS Operating Systems Review 40, no. 5 (October 20, 2006): 106–16. http://dx.doi.org/10.1145/1168917.1168872.

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16

Heath, Taliver, Ana Paula Centeno, Pradeep George, Luiz Ramos, Yogesh Jaluria, and Ricardo Bianchini. "Mercury and freon." ACM SIGPLAN Notices 41, no. 11 (November 2006): 106–16. http://dx.doi.org/10.1145/1168918.1168872.

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17

Heath, Taliver, Ana Paula Centeno, Pradeep George, Luiz Ramos, Yogesh Jaluria, and Ricardo Bianchini. "Mercury and freon." ACM SIGARCH Computer Architecture News 34, no. 5 (October 20, 2006): 106–16. http://dx.doi.org/10.1145/1168919.1168872.

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18

Wróbel-Jędrzejewska, Magdalena. "Kontrola freonów w całym łańcuchu produkcji żywności." PRZEMYSŁ SPOŻYWCZY 1, no. 1 (January 5, 2017): 11–16. http://dx.doi.org/10.15199/65.2017.1.2.

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19

Wang, Hong Li, Xiu Juan Hou, and Jing Rui Tian. "Analysis of Refrigerants Properties and Alternative." Advanced Materials Research 287-290 (July 2011): 2438–42. http://dx.doi.org/10.4028/www.scientific.net/amr.287-290.2438.

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With the question of Ozone Depression Potential and Global Warming Potential popping out day by day, the Freon refrigerant alternative has become one of the current research contents of refrigerant. Based on the given Freon refrigerant R22, R134a and natural refrigerant CO2, the differences of their properties were compared, and the relevant alternative refrigerants conducted an investigation. The results show that the natural refrigerant CO2instead of Freon refrigerant has good application prospects; it provides basic data to develop new products, which enhance the COP of air conditioner and heat pump.

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20

Bulanin, M. O., and I. M. Kislyakov. "Electric-dipole polarizabilities of molecules of CFxCl4−x (x=1–4) Freons. Coefficients of dispersion interaction between different freons and between freons and noble gases." Optics and Spectroscopy 93, no. 1 (July 2002): 27–32. http://dx.doi.org/10.1134/1.1496719.

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21

Kowalczyk, J., A. Jówko, and M. Symanowicz. "Kinetics of radical reactions in freons." Journal of Radioanalytical and Nuclear Chemistry 232, no. 1-2 (June 1998): 75–78. http://dx.doi.org/10.1007/bf02383716.

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22

Polyakov, N. S., M. L. Gubkina, and A. V. Larin. "Dynamics of the adsorption of freons." Russian Chemical Bulletin 45, no. 6 (June 1996): 1303–6. http://dx.doi.org/10.1007/bf01434201.

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23

Somlyo, Avril V., Meredith Bond, John C. Silcox, and A. P. Somlyo. "Direct Measurements of Intracellular Elemental Composition Utilizing a New Approach to Freezing In Vivo." Proceedings, annual meeting, Electron Microscopy Society of America 43 (August 1985): 10–13. http://dx.doi.org/10.1017/s0424820100117182.

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Many biological experiments can be successfully carried out on tissues isolated under well-defined experimental conditions, but for some physiological or pharmacological studies, knowledge of the in vivo elemental composition and/or structure is essential. We have developed a method for rapid freezing of organs in situ, with a new spring-loaded, hand held, clamping device that holds two apposing melting Freon popsicles (Fig. 5). The melting Freon surfaces that contact the tissue are at the melting point of Freon 22, and these mold to the unevenness of the tissue surface. Rapidly frozen samples of liver, pancreas or mesentery were obtained by placing an anesthetized rat in a cloth sling over an environmental chamber kept at 37°C, 100% humidity (Fig. 5). A small incision is made in the abdomen, and the abdominal wall is manipulated until a lobe of liver protrudes through the incision, while taking care not to touch the surface of the organ. Immediately, the Freon clamper is activated to snap freeze the tissue.

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24

Schwartz, Sorell L. "Freon and Hypertension-Reply." JAMA: The Journal of the American Medical Association 268, no. 12 (September 23, 1992): 1541. http://dx.doi.org/10.1001/jama.1992.03490120054023.

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25

Oenbrink, Raymond J. "Unexpected adverse effects of Freon 11 and Freon 12 as medication propellants." Journal of the American Osteopathic Association 93, no. 6 (June 1, 1993): 714. http://dx.doi.org/10.7556/jaoa.1993.93.6.714.

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26

Kamiyama, S., and T. Yamasaki. "Critical Condition of Cavitation Occurrence in Various Liquids." Journal of Fluids Engineering 108, no. 4 (December 1, 1986): 428–32. http://dx.doi.org/10.1115/1.3242599.

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An experimental study of cavitation occurrence in benzene, kerosene, gasoline, and Freon 12 was conducted using a square-edged orifice. The experimental results of the desinent cavitation number are compared with the calculated values predicted from two-phase flow analogy. The predicted values show reasonable agreement with experimental data for benzene and gasoline but require some modifications for kerosene and Freon 12.

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27

Wang, Xiao Lu, and Da Yu Huang. "Thermal Analysis and Design Applications of the Spiral Groove Tubes in Condensers." Advanced Materials Research 1070-1072 (December 2014): 1705–8. http://dx.doi.org/10.4028/www.scientific.net/amr.1070-1072.1705.

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In this paper, condensation mechanism of the Freon refrigerants outside spiral grooved tube is discussed. The heat transfer coefficient of Freon refrigerants condensation outside spiral grooved tube is obtained. A calculation example of heat transfer coefficient on the tube bundle of condenser with baffle bars is presented. It shows the excellent thermal performance of the spiral groove tubes compared to smooth tubes.

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28

Alary, Jean-François, Genaro Hernandez, and Eric D. Salin. "Zeolite Slurry Analysis Using Freon-Assisted Graphite Furnace Vaporization for Inductively Coupled Plasma Atomic Emission Spectrometry." Applied Spectroscopy 49, no. 12 (December 1995): 1796–803. http://dx.doi.org/10.1366/0003702953965948.

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Halogen-assisted electrothermal vaporization (ETV) was used as a sample introduction mechanism for inductively coupled plasma atomic emission spectrometry. Freon-12™ was used as a gas-phase halogenation reagent in the ETV graphite furnace to enhance vaporization of carbide-forming elements by converting them into metal halides. With Freon ETV, detection levels for Zn, Pb, Cd, Mn, V, Cu, Ti, and Ca were lower than those obtained with conventional nebulization of liquid standards. A zeolite sample was analyzed for the refractory elements chromium and vanadium. Without Freon, the signals for these elements were very low; however, with Freon, the signals were dramatically improved. Detection limits of 1.4 μg/g and 0.3 μg/g, respectively, were obtained for these elements. A sheathing and cooling gas flow was introduced to reduce analyte vapor condensation on tubing walls and to promote aggregate formation. This additional flow enhanced the quality of signal with the zeolite but proved to be detrimental for the determination of refractory elements in liquid standards with or without halogenation. The precision of determination for the zeolite sample varied from 3% for cadmium, to 6% for lead.

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29

Kuryanov, Anton, Ivo Mõik, and Oksana Grigoryeva. "Combined Cycle Gas Turbine (CCGT) with Freon Steam Turbine." Applied Mechanics and Materials 792 (September 2015): 351–58. http://dx.doi.org/10.4028/www.scientific.net/amm.792.351.

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The article considers the prospect of a combined-cycle plant with freon as the working fluid of the steam turbine. Methodical approach to the study of such plants is expounded. For the option, CCGT with gas turbine M701G2 and use of freon R134a results of calculations of technical and economic efficiency, gas-dynamic characteristics, design-layout parameters are shown. The effectiveness of investments has been assessed.

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30

Linhart, Petr. "Extraction of promethium complex with 4-benzoyl-5-methyl-2-phenyl-2,4-dihydro-3H-pyrazol-3-one into Freon 113 and its mixtures with benzene." Collection of Czechoslovak Chemical Communications 56, no. 10 (1991): 2096–99. http://dx.doi.org/10.1135/cccc19912096.

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A study of the dependence of distribution of Pm(III) between aqueous phase ( perchlorate medium) and Freon 113 (or a Freon 113-benzene mixture 2 : 1) on pH and pA has shown that the complex PmA3 is extracted into the organic phase with the extraction constant log Kex = -4.35. The stability constant βn of the complex PmA3 has been calculated by the Leden method.

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31

Parmon, V. N., and V. S. Zakharenko. "Destructive Photoadsorption of Freons on Atmospheric Aerosols." Zeitschrift für Physikalische Chemie 1, no. 1 (January 1998): 229–36. http://dx.doi.org/10.1524/zpch.1998.1.1.229.

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32

Parmon, V. N., and V. S. Zakharenko. "Destructive Photoadsorption of Freons on Atmospheric Aerosols." Zeitschrift für Physikalische Chemie 213, Part_1 (January 1999): 9–16. http://dx.doi.org/10.1524/zpch.1999.213.part_1.009.

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33

Hung, I. Fu, and Alain Bernier. "Freons and hydrocarbons in aerosol spray cans." Bulletin of Environmental Contamination and Toxicology 45, no. 1 (July 1990): 133–38. http://dx.doi.org/10.1007/bf01701840.

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34

Wise, Jonathan, John A. Kadyk, Dennis W. Hess, and Michael C. Williams. "Effects of Freons on wire chamber aging." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 297, no. 1-2 (November 1990): 169–78. http://dx.doi.org/10.1016/0168-9002(90)91363-g.

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35

Catton, I., and J. O. Jakobsson. "The Effect of Pressure on Dryout of a Saturated Bed of Heat-Generating Particles." Journal of Heat Transfer 109, no. 1 (February 1, 1987): 185–95. http://dx.doi.org/10.1115/1.3248042.

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The results of an experimental investigation of pressure effects on dryout heat flux in a volume-heated porous bed are reported. Several porous beds of near-uniform-sized particles were studied at pressures up to 5 atm. The beds were saturated with water, Freon-113, acetone, and methanol. Simple scaling of the Freon-113 results is used to yield results valid for water pressures from 1 atm to 37.3 atm.

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36

Busche, S. "Quantification of binary mixtures of the freones R22 and R134a by surface plasmon resonance." Sensors and Actuators B: Chemical 89, no. 1-2 (March 1, 2003): 192–98. http://dx.doi.org/10.1016/s0925-4005(02)00463-x.

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37

Sorokin, I. D., V. I. Pergushov, L. I. Savostina, and M. Ya Melnikov. "Phototransformations of azetidine radical cations stabilized in freonic matrices." High Energy Chemistry 48, no. 3 (May 2014): 180–84. http://dx.doi.org/10.1134/s001814391403014x.

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38

Faozan, Imam. "ANALISIS PERBANDINGAN EVAPORATOR KULKAS (LEMARI ES) DENGAN MENGUNAKAN REFRIGERANT R-22 DAN R-134A." Jurnal Teknik Mesin 4, no. 3 (March 21, 2017): 33. http://dx.doi.org/10.22441/jtm.v4i3.1272.

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Tulisan ini bertujuan untuk mengetahui komponen mesin refrigerasi khususnya pembahasan evaporator. Dalam penelitian ini digunakan lemari pendingin (kulkas ) sederhana untuk pengawetan dan pendinginan bahan makanan dalam rumah tangga. Untuk refrigerant yang digunakan adalah Refrigerant Freon R – 22 dan Freon R - 134a sebagai perbandingan dan untuk mengetahui performance evaporator ( COP ) pada mesin refrigerasi untuk rumah tangga. Lemari pendingin yang dianalisa berukuran tinggi = 1 m, panjang = 0,55 m dan lebar 0,5 m. Temperatur evaporasi = -5°C dan temperature kondensasi = 40°C.

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39

Gao, Hong, Ping Ning, Di Zhang, Tian Cheng Liu, and Shi Bo Wang. "CFD Numerical Simulation on Swirl-Flow Combustion in Freon Decomposition Burner." Applied Mechanics and Materials 195-196 (August 2012): 791–94. http://dx.doi.org/10.4028/www.scientific.net/amm.195-196.791.

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The Computational Fluid Dynamics (CFD) model of the freon decomposition burner with bicyclo-inlet is established by using Eddy-Dissipation Model (EDM) chemical reaction model. The jet-flow turbulent diffusion burning and swirl-flow combustion are simulated to prove that the swirl-flow combustion can get shorter blaze. The strong vortex flow enlarges the high temperature region in the burner and the temperature is more uniform, which is conducive to the freon decomposition at a great heat.

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40

Yamsashita, M. "Freon affects infrared gas monitors." Anaesthesia 47, no. 9 (September 1992): 816. http://dx.doi.org/10.1111/j.1365-2044.1992.tb03280.x.

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41

Parslow, M. "Freon affects infrared gas monitors." Anaesthesia 47, no. 9 (September 1992): 816–17. http://dx.doi.org/10.1111/j.1365-2044.1992.tb03281.x.

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42

Zhdanov, B. V., A. Stooke, G. Boyadjian, A. Voci, and R. J. Knize. "Optically pumped caesium-Freon laser." Electronics Letters 44, no. 12 (2008): 735. http://dx.doi.org/10.1049/el:20081024.

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43

Shul’ga, Yu M., V. M. Martynenko, S. A. Baskakov, G. V. Shilov, E. E. Khorkin, T. N. Fursova, A. V. Bazhenov, A. F. Shestakov, and Yu G. Morozov. "Fullerite with intercalated freon Ch2F2." Russian Journal of Physical Chemistry A 82, no. 7 (July 2008): 1159–63. http://dx.doi.org/10.1134/s0036024408070182.

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44

Minami, Wataru, Hiroki Fujii, and Hee-Joon Kim. "Combustion Decomposition Treatment of Freon." KAGAKU KOGAKU RONBUNSHU 32, no. 2 (2006): 190–95. http://dx.doi.org/10.1252/kakoronbunshu.32.190.

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45

Gorchakovskii, V. K., V. E. Zadov, and V. N. Podvezennyi. "Physical properties of Freon 216." Journal of Engineering Physics 59, no. 1 (July 1990): 920–23. http://dx.doi.org/10.1007/bf00871333.

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46

Darmawan, I. Gede Agus, Lie Jasa, and Pratolo Rahardjo. "LANCAR Rancang Bangun Alat Sebagai Layanan Notifikasi Air conditioner Yang Rusak Pada Bagian Kompresor." Majalah Ilmiah Teknologi Elektro 19, no. 2 (December 31, 2020): 211. http://dx.doi.org/10.24843/mite.2020.v19i02.p13.

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Indonesia merupakan negara tropis, dimana indonesia memiliki dua musim yaitu musim hujan dan musim kemarau. Pada saat musim kemarau cuaca menjadi panas sehingga diperlukannya teknologi yang bisa mengubah udara panas menjadi sejuk. AC (Air Conditioner) merupakan teknologi yang digunakan untuk menyejukkan udara melalui sirkulasi udara. AC terbagi menjadi dua bagian yaitu indoor dan outdoor. Indoor dan outdoor terhubung melalui pipa tembaga yang merupakan jalur gas freon. Gas freon akan dipompa melalui outdoor menggunakan mesin kompresor untuk menekan aliran gas freon agar mengalir ke bagian evaporator indoor dan kompresor akan menghisap gas freon lagi hingga ke bagian kondensor pada outdoor, karena kompresor merupakan bagian terpenting pada AC maka kompresor harus dirawat secara rutin dengan mengetahui ampere kinerja pada kompresor. Jadi tujuan dari penelitian ini adalah untuk monitoring kinerja pada kompresor. Monitoring ini dilakukan dengan cara merancang alat yang bernama LANCAR (layanan notifikasi air conditioner yang rusak). Alat LANCAR memiliki tiga bagian yaitu hardware sebagai alat untuk mendeteksi ampere kinerja kompresor, software sebagai media notifikasi serta untuk monitoring ampere kompresor dan database sebagai penyimpan data pada kompresor. Hardware yang digunakan yaitu NodeMCU esp 8266, Sct- 013,Sw-420 dan modul relay 1 channel. Bagian-bagian ini akan terhubung dengan sistem IoT (internet of things) dimana alat ini mampu memberikan notifikasi ketika kompresor dalam keadaan rusak dan data kompresor akan disimpan di dalam database agar nantinya dapat dilihat oleh pemilik AC.

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47

Pettigrew, M. J., C. E. Taylor, V. P. Janzen, and T. Whan. "Vibration Behavior of Rotated Triangular Tube Bundles in Two-Phase Cross Flows." Journal of Pressure Vessel Technology 124, no. 2 (May 1, 2002): 144–53. http://dx.doi.org/10.1115/1.1462045.

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The results of a series of tests describing the vibration behavior of several rotated triangular tube bundles subjected to two-phase cross flows are presented. Tube bundles with a pitch-to-diameter ratio of approximately 1.5 were tested over a broad range of void fractions and mass fluxes. Fluidelastic instability, random turbulence excitation, hydrodynamic mass, two-phase damping and local void-fraction were investigated. Well-defined fluidelastic instabilities were observed in continuous two-phase flow regimes. However, intermittent two-phase flow regimes had a dramatic effect on fluidelastic instability leading to lower than expected threshold flow velocities for instability. This effect was more pronounced in Freon two-phase flow than in air-water, and appeared well correlated to the transition between continuous and intermittent flow regimes. Generally, random turbulence excitation forces were much lower in Freon than in air-water. Although very dependent on void fraction, as expected, damping was quite similar in air-water and Freon.

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48

Madygulov, M. Sh, A. G. Zavodovsky, and V. P. Shchipanov. "KINETICS OF GAS HYDRATES FORMATION AND GROWTH BASED ON MODIFIED ICE." Oil and Gas Studies, no. 6 (December 1, 2017): 117–22. http://dx.doi.org/10.31660/0445-0108-2017-6-117-122.

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The results of the studies of influence of polyvinylpyrrolidone on the kinetics of formation and the growth of Freon-12 gas hydrate are presented. Based on the P-V-T measurements the degree of conversion of ice into gas hydrate at various concentrations of polyvinylpyrrolidone was calculated. The fact of preservation of inhi-biting properties of polyvinylpyrrolidone in formation of a gas hydrate based on frozen aqueous solutions has been established. The studied polymer shows promoting properties, which leads to an increase in rate of the growth of Freon-12 hydrate based on modified ice.

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49

Хрипунов, Г. С., А. В. Мериуц, Т. Н. Шелест, and М. Г. Хрипунов. "Влияние отжига во фреоне на кристаллическую структуру слоев теллурида кадмия и эффективность пленочных фотоэлектрических преобразователей на их основе." Физика и техника полупроводников 53, no. 1 (2019): 93. http://dx.doi.org/10.21883/ftp.2019.01.46994.8871.

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AbstractSolar cells (SCs) based on cadmium-telluride base layers, obtained by thermal evaporation and closed-space sublimation (CSS), are investigated. The base layers are activated via annealing in Freon. Structural and morphological studies are carried out to compare the recrystallization processes occurring during annealing in CdTе layers fabricated by different methods. The output parameters and light diode characteristics of the SCs are investigated, and the possibility of applying Freon annealing in the commercial production technology of thin-film CdS/CdTе SCs with base layers formed by thermal vacuum evaporation is analyzed.

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Kolomiitsova, T. D., V. A. Kondaurov, S. M. Melikova, and D. N. Shchepkin. "Vibrational spectra of Freons dissolved in liquid argon." Journal of Applied Spectroscopy 43, no. 3 (September 1985): 999–1005. http://dx.doi.org/10.1007/bf00660436.

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