Relevant bibliographies by topics / R507a

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'R507a'

Author: Grafiati
Published: 4 June 2021
Last updated: 20 June 2025

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Journal articles on the topic "R507a"

1

Selan, Rima Nindia, and Matheus Magnus Dwinanto. "Studi Kinerja dan Konsumsi Energi Air Blast Freezer Menggunakan Refrigeran Hidrofluorokarbon dan Hidrokarbon." Jurnal Dinamika Vokasional Teknik Mesin 6, no. 1 (2021): 26–34. http://dx.doi.org/10.21831/dinamika.v6i1.36728.

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Penggunaan refrigeran hidrokarbon yang lebih ramah lingkungan dibandingkan dengan hidrofluorokarbon telah menjadi tuntutan dan isu sentral pada masa yang akan datang baik itu di refrigerator rumah tangga maupun di refrigerator industri seperti air blast freezer. Hal ini disebabkan refrigeran hidrokarbon tidak memiliki potensi penipisan ozon ODP dan potensi pemanasan global GWP minimal. Makalah ini menyajikan studi kinerja teoritis penggunaan R290 dan R600a sebagai pengganti R404A dan R507A. Perangkat lunak CoolPack digunakan untuk mensimulasikan kinerja dan konsumsi energi sistem pada beberapa
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Servianus, Yohanes Viva. "PERBANDINGAN KINERJA TEORITIS AIR BLAST FREEZER MENGGUNAKAN REFRIGERAN HIDROFLUOROKARBON DAN HIDROKARBON." Machine : Jurnal Teknik Mesin 7, no. 2 (2022): 1–7. http://dx.doi.org/10.33019/jm.v7i2.1833.

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Air blast freezer telah digunakan sebagai cara pembekuan cepat di unit pengolahan ikan sebelum dibekukan untuk waktu yang lama di dalam cold storage. Untuk itu penggunaan refrigeran hidrokarbon yang lebih ramah lingkungan telah menjadi tuntutan dan isu sentral pada masa yang akan datang. Makalah ini menyajikan studi kinerja teoritis penggunaan R290 dan R600a sebagai pengganti R404A dan R507A. Kinerja teoritis sistem didasarkan pada variasi temperatur evaporasi menggunakan perangkat lunak CoolPack dengan temperatur kondensasi dipertahankan konstan. Besaran-besaran penting yang dianalisis adalah
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Shikov, Sergei, Wenman Wu, and Peter N. Walsh. "Structural Determinants for Heparin Binding in Human Coagulation Factor XI." Blood 110, no. 11 (2007): 2705. http://dx.doi.org/10.1182/blood.v110.11.2705.2705.

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Abstract Previous studies from our laboratory and others have demonstrated that zymogen factor XI (FXI) binds to heparin with moderate (KD ∼110 nM) affinity via residues (K252, K253 and K255) located in the Apple 3 (A3) domain. In contrast, the enzyme, FXIa, was shown to bind to heparin (Biochemistry40: 7569–7580, 2001) with significantly higher affinity (KD ∼9 nM by SPR and ∼1.5 nM by ELISA) via residues (K529, R530 and R532) within the catalytic domain (CD). This interaction potentiates by ∼10-fold the inhibition of FXIa by protease nexin-2. Also, polyanions heparin and dextran sulfate inhib
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Kuczyński, Waldemar, Marcin Kruzel, and Katarzyna Chliszcz. "Regression Model of Dynamic Pulse Instabilities during Condensation of Zeotropic and Azeotropic Refrigerant Mixtures R404A, R448A and R507A in Minichannels." Energies 15, no. 5 (2022): 1789. http://dx.doi.org/10.3390/en15051789.

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This paper presents experimental research and mathematical modeling data concerning the impact of unit dynamic instabilities on the phase-transition condensation processes of the zeotropic mixtures R404A and R448A and azeotropic R507A refrigerants in pipe minichannels. The R507 refrigerant is currently used as a temporary substitute for R404A, whereas R448A is a sustainable prospective substitute for R404A. The study presents experimental testing data for the condensation processes of these refrigerants in pipe minichannels and a proposal for the use of dimensional analysis, including the Π-Bu
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Mancuhan, Ebru. "Comparative evaluation of a two-stage refrigeration system with flash intercooling using different refrigerants." Thermal Science 24, no. 2 Part A (2020): 815–30. http://dx.doi.org/10.2298/tsci180921011m.

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The aim of this study is to investigate the effect of low global warming potential refrigerants on the optimum intermediate pressure (POPT,int) and performance (COP) values of a refrigeration system with flash intercooling. For realize, the optimum operating parameters of system were determined in low temperature applications through a theoretical analysis according to the different refrigerants (R290, R404A, R407C, R507A, and R22). The theoretical modelling of system is done by optimizing the intermediate pressure at given evaporation (TE) and condensation (TC) temperatures for selected refri
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HABIB, O. Khairul, Bidvut B. SAHA, Ibrahim I. ELSHARKAWY, Anutosh CHAKRABORTY, and Shigeru KOYAMA. "B104 HENRY'S LAW COEFFICIENTS FOR ADSORPTION OF R507A ON ACTIVATED CARBON." Proceedings of the National Symposium on Power and Energy Systems 2008.13 (2008): 63–66. http://dx.doi.org/10.1299/jsmepes.2008.13.63.

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Habib, Khairul. "Performance Study of Waste Heat Driven Pressurized Adsorption Chiller." Applied Mechanics and Materials 315 (April 2013): 380–84. http://dx.doi.org/10.4028/www.scientific.net/amm.315.380.

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This article presents a transient modeling and performance of a waste heat driven pressurized adsorption chiller. This innovative adsorption chiller employs pitch based activated carbon of type Maxsorb III as adsorbent and R507A as refrigerant as adsorbent-refrigerant pair. This chiller utilizes low-grade heat source to power the cycle. A parametric study has been presented where the effects of adsorption/desorption cycle time, switching time and regeneration temperature on the performance are reported in terms of cooling capacity and coefficient of performance (COP). Results indicate that the
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Arora, Akhilesh, and S. C. Kaushik. "Theoretical analysis of a vapour compression refrigeration system with R502, R404A and R507A." International Journal of Refrigeration 31, no. 6 (2008): 998–1005. http://dx.doi.org/10.1016/j.ijrefrig.2007.12.015.

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Habib, Khairul, Bidyut B. Saha, Kazi A. Rahman, Anutosh Chakraborty, Shigeru Koyama, and Kim Choon Ng. "Experimental study on adsorption kinetics of activated carbon/R134a and activated carbon/R507A pairs." International Journal of Refrigeration 33, no. 4 (2010): 706–13. http://dx.doi.org/10.1016/j.ijrefrig.2010.01.006.

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Stojanović, Milan, and Uroš Milovančević. "Sintetičke alternative za rashladno sredstvo R404A." KGH – Klimatizacija, grejanje, hlađenje 46, no. 1 (2017): 87. http://dx.doi.org/10.24094/kghc.017.46.1.87.

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Od uvođenja rashladnih sredstava HCFC baziranih na R22 traže se rešenja koja će biti trajnijeg karaktera. Prva zamena za HCFC – R22 bazirana na HFC R404A u Evropi je prevaziđena uvođenjem propisa EN 517/2014 (sa važnošću od 1.1.2015) kao naslednika prethodne direktive EN 862/2006. Servisna zabrana rada sa R404A i R507A od 2020. godine u Evropi će otežati serviserima potragu za budućim zamenama i obeležavanjima za šta se treba spremati već danas. Alternative koje su danas predložene za R404A (GWP 3922) jesu: R407A (2107), R407C (1774), R407F(1825), R410A (2088), R442A (1888), R449A (1397), HFO
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Dissertations / Theses on the topic "R507a"

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Llopis, Doménech Rodrigo. "Evaluación experimental de una planta frigorífica de doble etapa de compresión trabajando con un compresor compound. Análisis de los efectos de desrecalentamiento y subenfriamiento utilizando como fluido de trabajo el HFC-404A." Doctoral thesis, Universitat Politècnica de València, 2008. http://hdl.handle.net/10251/3023.

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El elevado impacto sobre el Medio Ambiente del sector de la producción de frío ha impulsado el uso y desarrollo de métodos de refrigeración cada vez más eficientes desde el punto de vista energético. Dentro de estos métodos se encuentran los sistemas de producción de frío por compresión en doble etapa, que se desarrollaron en el siglo XIX, y que por ahora, son utilizados principalmente en aplicaciones de media y baja temperatura de evaporación, especialmente dentro del sector de la refrigeración comercial. Dichos sistemas corresponden a una solución eficiente desde el punto de vista energético
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Bedřich, Miroslav. "Plynová tepelná čerpadla se spalovacím motorem." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-231284.

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The aim of this Diploma thesis is a description of gas heat pump (GHP) technology and the possibility of their usage in real life. Also units from the major manufactures of GHP units in the Czech Republic and abroad are evaluated from technical and economical point of view. The thesis as well includes a part where is decided if it is better to further develop GHP units with higher or lower performance. In the last part of thesis are cooling circuits designed for both lower and higher performance, than performance of existing GHP unit Polo 100. As a result, the units with higher performance are
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Books on the topic "R507a"

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Cec Policies for Delivery of Services to Exceptional Children (Stock #r5075)). Council for Exceptional Children, 1994.

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Book chapters on the topic "R507a"

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Satapathy, Prem Prasad, Prasanta K. Satapathy, and Sudhansu S. Sahoo. "Comparative Performance Study of Autocascade and Cascade Refrigeration Systems Using Working Fluid Pair R23/R507A." In Lecture Notes in Mechanical Engineering. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-1080-5_33.

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Conference papers on the topic "R507a"

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Greco, Adriana, Rita Mastrullo, Alfonso W. Mauro, and Giuseppe P. Vanoli. "Two Phase Pressure Drops for Refrigerants: A Statistical Comparison Among Experimental Data and Correlations." In ASME 8th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2006. http://dx.doi.org/10.1115/esda2006-95817.

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A 962 points database for refrigerants two-phase flows by Greco A. and Vanoli G.P. was statistically compared to four widely used prediction methods by Lockhart and Martinelli, Chawla, Theissing and Mu¨ller-Steinhagen and Heck in order to determine the best one. The experimental points are in a wide range of operating conditions for six pure or mixed refrigerants (R134a, R22, R407C, R507A, R410A and R404A) during evaporation in a smooth horizontal tube of 6 m length and 6 mm ID.
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Alkan, Beyza, Ali Celen, Alican Çebi, Ahmet Selim Dalkilic, and Somchai Wongwises. "Refrigerated Railroad Car Design for Shipping Frozen Meat Using Alternative Refrigerants." In ASME 2014 4th Joint US-European Fluids Engineering Division Summer Meeting collocated with the ASME 2014 12th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/fedsm2014-21068.

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Refrigerated railroad cars, known as reefers, are railroad rolling stock designed to carry perishable freight at specific temperatures. They are insulated boxcars that keep the cargo at a regulated temperature. As soon as railroad cars had the capability to keep a load cold, the potential growth of the meat, dairy, fruit and brewery industries became nearly unlimited. In this paper, a cold-room system in a railroad car was investigated as a case study to illustrate the use of the sample model. The change of substitute refrigerants and insulation thickness of the cold rooms’ refrigeration syste
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Balcilar, Muhammet, Ahmet Selim Dalkiliç, Şevket Özgür Atayılmaz, Hakan Demir, and Somchai Wongwises. "Prediction of Pressure Drop of Various Refrigerants During Condensation in Horizontal Smooth and Micro-Fin Tubes by Means of Artificial Neural Networks." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-85039.

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The predictions of condensation pressure drops of R12, R22, R32, R125, R410A, R134a, R22, R502 and R507a flowing inside various horizontal smooth and micro-fin tubes are made using the numerical techniques of Artificial Neural Networks (ANNs) and non-linear least squares (NLS). The National Institute of Standards and Technology’s (NIST) experimental data and, Eckels’ and Pate’s experimental data, as presented in Choi et al.’s study provided by NIST, are used in our analyses. In their experimental setups, the horizontal test sections have 1.587 m, 3.78 m, 3.81 m and 3.97 m long countercurrent f
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Avsec, Jurij, Milan Marcic, Alfred Leipertz, and Andreas Froeba. "The velocity of sound for binary mixture R507 and ternary mixture R404A." In 35th AIAA Thermophysics Conference. American Institute of Aeronautics and Astronautics, 2001. http://dx.doi.org/10.2514/6.2001-2754.

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Sami, S. M., and J. Comeau. "Study of Liquid Injection on Pressure Drop of Refrigerant Mixtures Inside Enhanced Surface Tubing." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-82462.

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Two phase flow pressure drop characteristics observed under liquid injection during boiling of refrigerant mixtures R-404A, R407C and R507 as well as R-410A are presented in this paper. Experiments showed that liquid injection tends to decrease the pressure drop during boiling which will have positive impact in increasing the boiling heat transfer rate, heat flux and system efficiency. However, condensation data demonstrated that liquid injection increases the pressure drop. In addition, the data also reveals that the refrigerant under investigation exhibit the same behaviour at higher Reynold
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Sun, Licheng, and Kaichiro Mishima. "Evaluation Analysis of Prediction Methods for Two-Phase Flow Pressure Drop in Mini-Channels." In 16th International Conference on Nuclear Engineering. ASMEDC, 2008. http://dx.doi.org/10.1115/icone16-48210.

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2092 data of two-phase flow pressure drop were collected from 18 published papers of which the working fluids include R123, R134a, R22, R236ea, R245fa, R404a, R407C, R410a, R507, CO2, water and air. The hydraulic diameter ranges from 0.506 to 12mm; Relo from 10 to 37000, and Rego from 3 to 4×105. 11 correlations and models for calculating the two-phase frictional pressure drop were evaluated based upon these data. The results show that the accuracy of the Lockhart-Martinelli method, Mishima and Hibiki correlation, Zhang and Mishima correlation and Lee and Mudawar correalion in the laminar regi
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Aprea, C., A. Greco, and G. P. Vanoli. "Local Heat Transfer Coefficients and Pressure Drop During Evaporation in a Smooth Horizontal Tube." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-39313.

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R22 is the most widely employed HCFC working fluid in vapour compression plant. HCFCs must be replaced within 2020. Major problems arise with the substitution of the working fluids, related to the decrease in performance of the plant. Therefore, extremely accurate design procedures are needed. The relative sizing of each of the components of the plant is crucial for cycle performance. For this reason, the knowledge of the new fluids heat transfer characteristics in condensers and evaporators is required. The local heat transfer coefficients and pressure drop of pure R22 and of the azeotropic m
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Chakravarthy, Vijayaraghavan, Joe Weber, Abdul-Aziz Rashad, Arun Acharya, and Dante Bonaquist. "Oxygen Liquefier Using a Mixed Gas Refrigeration Cycle." In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-42124.

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This paper presents the design, selection of equipment, testing, and analysis of a 2 TPD (76 kg/hr) prototype oxygen liquefier that employs a mixed gas refrigeration cycle. Small scale oxygen plants (30–60 TPD) based on VPSA systems (Vapor Pressure Swing Adsorption) periodically require liquid back-up to provide uninterrupted supply of O2 gas to customers during planned plant maintenance. Supply of liquid for back-up, especially to customers in remote locations, is expensive and difficult. Economically designed MGR liquefiers will fulfill this market need. The 2 TPD prototype O2 liquefier is b
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