Pub Date : 1900-01-01DOI: 10.17586/1606-4313-2022-21-1-26-36
S. Camara, A. Sulin, V. I. Lysev
{"title":"Analyzing the performance of a combined type collector for solar heating and night radiation cooling","authors":"S. Camara, A. Sulin, V. I. Lysev","doi":"10.17586/1606-4313-2022-21-1-26-36","DOIUrl":"https://doi.org/10.17586/1606-4313-2022-21-1-26-36","url":null,"abstract":"","PeriodicalId":148431,"journal":{"name":"Journal International Academy of Refrigeration","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126229699","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.17586/1606-4313-2020-19-1-34-39
A. Malyshev, O. Malinina, D. E. Kalimjanov, P. Sukhov, K. F. Kuadio
Проведен анализ и сопоставление методик расчета теплообмена при кипении хладагентов в горизонтальных трубах, включая традиционные методы для расчета средней теплоотдачи В. Брайна, Г. Квейта, М. Бэйкура, С. Богданова, а также работ, посвященных исследованию локального теплообмена, таких как Локарта — Мартинелли, Д. Хавла, К. Шарма. Было установлено, что при массовой скорости 50 кг/ (с∙м2), рассмотренные методики расчета средней теплоотдачи удовлетворительно согласуются между собой, что объясняется общностью режимов двухфазных потоков при этой скорости. При скорости 150 кг/ (с∙м2) наблюдается существенное расхождение расчетных данных. При этом методика основанная на использовании истинных параметров фаз и прогнозирования режимов течения дает значения коэффициентов теплоотдачи на 30 % выше других уравнений. Это объясняется тем обстоятельством, что приведенные методы расчета средних коэффициентов теплоотдачи получены в основном для расслоенного и снарядного режимов, а при высоких скоростях имеет место кольцевой режим течения, который известными уравнениями, как правило, не учитывался. Подтверждением правомерности использования комплексного метода.основанного на истинных параметрах является хорошая сходимость с опытными данными Х. Юсиды и С. Ямогучи для труб диаметром 6 мм и миниканалов с величиной эквивалентного диаметра 0,5 мм. Ключевые слова: миниканалы, локальный теплообмен, истинные параметры фаз, массовая скорость, коэффициент теплоотдачи, теплообменное аппаратостроение.
{"title":"Comparative analysis of thermal exchange calculation for refrigerants boiling in channels","authors":"A. Malyshev, O. Malinina, D. E. Kalimjanov, P. Sukhov, K. F. Kuadio","doi":"10.17586/1606-4313-2020-19-1-34-39","DOIUrl":"https://doi.org/10.17586/1606-4313-2020-19-1-34-39","url":null,"abstract":"Проведен анализ и сопоставление методик расчета теплообмена при кипении хладагентов в горизонтальных трубах, включая традиционные методы для расчета средней теплоотдачи В. Брайна, Г. Квейта, М. Бэйкура, С. Богданова, а также работ, посвященных исследованию локального теплообмена, таких как Локарта — Мартинелли, Д. Хавла, К. Шарма. Было установлено, что при массовой скорости 50 кг/ (с∙м2), рассмотренные методики расчета средней теплоотдачи удовлетворительно согласуются между собой, что объясняется общностью режимов двухфазных потоков при этой скорости. При скорости 150 кг/ (с∙м2) наблюдается существенное расхождение расчетных данных. При этом методика основанная на использовании истинных параметров фаз и прогнозирования режимов течения дает значения коэффициентов теплоотдачи на 30 % выше других уравнений. Это объясняется тем обстоятельством, что приведенные методы расчета средних коэффициентов теплоотдачи получены в основном для расслоенного и снарядного режимов, а при высоких скоростях имеет место кольцевой режим течения, который известными уравнениями, как правило, не учитывался. Подтверждением правомерности использования комплексного метода.основанного на истинных параметрах является хорошая сходимость с опытными данными Х. Юсиды и С. Ямогучи для труб диаметром 6 мм и миниканалов с величиной эквивалентного диаметра 0,5 мм. Ключевые слова: миниканалы, локальный теплообмен, истинные параметры фаз, массовая скорость, коэффициент теплоотдачи, теплообменное аппаратостроение.","PeriodicalId":148431,"journal":{"name":"Journal International Academy of Refrigeration","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127121337","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.17586/1606-4313-2021-20-4-59-65
E. Tyurikova, M. Kustikova, E. Bykovskaia
The problem of identification of ozone-depleting substances was formulated because of challenges in the field of climatological research. Based on the data on controlled ozone-depleting substances and greenhouse gases, a description of refrigerants subjected to accounting during transportation and storage on the territory of the Russian Federation was given. A comparative analysis of methods, including chromatography-mass spectrometry, infrared absorption spectroscopy, and Raman spectroscopy for determining the composition of refrigerants by precision and time parameters is presented. The choice of the Raman spectroscopy method for the identification of complex-component compounds is substantiated. An example of R-12 refrigerant identification based on calculating spectra of vibrational processes of bonds in a molecule is considered and compared with recording spectral data. Based on the structure of the R-12 refrigerant molecule, the spectral lines were calculated depending on molecular vibrations. The lines identified were recorded in the Raman spectrum of the refrigerant detected by an experimental setup for the identification of ozone-depleting substances. It was concluded that the Raman method is promising for identification of multicomponent refrigerants.
{"title":"Raman spectroscopy for the analysis of refrigerants classified as ozone depleting substances","authors":"E. Tyurikova, M. Kustikova, E. Bykovskaia","doi":"10.17586/1606-4313-2021-20-4-59-65","DOIUrl":"https://doi.org/10.17586/1606-4313-2021-20-4-59-65","url":null,"abstract":"The problem of identification of ozone-depleting substances was formulated because of challenges in the field of climatological research. Based on the data on controlled ozone-depleting substances and greenhouse gases, a description of refrigerants subjected to accounting during transportation and storage on the territory of the Russian Federation was given. A comparative analysis of methods, including chromatography-mass spectrometry, infrared absorption spectroscopy, and Raman spectroscopy for determining the composition of refrigerants by precision and time parameters is presented. The choice of the Raman spectroscopy method for the identification of complex-component compounds is substantiated. An example of R-12 refrigerant identification based on calculating spectra of vibrational processes of bonds in a molecule is considered and compared with recording spectral data. Based on the structure of the R-12 refrigerant molecule, the spectral lines were calculated depending on molecular vibrations. The lines identified were recorded in the Raman spectrum of the refrigerant detected by an experimental setup for the identification of ozone-depleting substances. It was concluded that the Raman method is promising for identification of multicomponent refrigerants.","PeriodicalId":148431,"journal":{"name":"Journal International Academy of Refrigeration","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124003048","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.17586/1606-4313-2019-18-3-45-50
E. Zelenkova, Z. E. Yegorova
The process of enzymatic hydrolysis of carrot pulp was investigated for increase of carrot juice yield and carotene content in it. It was revealed that enzymatic preparations Pectinex BEXXL, Vegazim P and Vegazim P-CS demonstrated high efficacy in juice yield and Vegazim M and Vegazim P-CS — in carotene content. Vegazim P-CS was chosen from seven enzyme preparations according to the aggregate of estimated characteristics: carrot juice yield was equal to 71.6 % and carotene content — 4.83 mg/100 g. It is more 18,2 % and in 1.7 times respectively as compared with the control. The multivariate experiment to optimize the enzyme treatment of carrot pulp was designed and implemented. The resulting mathematical second-order model reflects a dependence of juice yield from the enzyme concentration, temperature and incubation time. Increase of juice yield was shown when enzyme concentration was raising up to ~ 0.3 ml/1000 g of carrot pulp. Further concentration growth had led to decrease of the response due to thinning pulp and deterioration of juice extraction, which is in agreement with experimental data. Increasing the temperature and incubation time of enzymatic hydrolysis greater than 65 °C and 120 min haven’t led to a further increase in juice yield too. The optimal parameters were established: temperature — ~ 52 °C, incubation time — ~ 85 min, concentration of Vegazim P-CS — ~ 0,3 ml/1000 g of carrot pulp. The obtained data demonstrate differences in the action of enzyme preparations, show feasibility of optimizing the enzymatic treatment parameters for a particular enzyme preparation according to the manufacturer’s goals.
{"title":"Optimization of the enzymatic process parameters for increase of carrot juice yield","authors":"E. Zelenkova, Z. E. Yegorova","doi":"10.17586/1606-4313-2019-18-3-45-50","DOIUrl":"https://doi.org/10.17586/1606-4313-2019-18-3-45-50","url":null,"abstract":"The process of enzymatic hydrolysis of carrot pulp was investigated for increase of carrot juice yield and carotene content in it. It was revealed that enzymatic preparations Pectinex BEXXL, Vegazim P and Vegazim P-CS demonstrated high efficacy in juice yield and Vegazim M and Vegazim P-CS — in carotene content. Vegazim P-CS was chosen from seven enzyme preparations according to the aggregate of estimated characteristics: carrot juice yield was equal to 71.6 % and carotene content — 4.83 mg/100 g. It is more 18,2 % and in 1.7 times respectively as compared with the control. The multivariate experiment to optimize the enzyme treatment of carrot pulp was designed and implemented. The resulting mathematical second-order model reflects a dependence of juice yield from the enzyme concentration, temperature and incubation time. Increase of juice yield was shown when enzyme concentration was raising up to ~ 0.3 ml/1000 g of carrot pulp. Further concentration growth had led to decrease of the response due to thinning pulp and deterioration of juice extraction, which is in agreement with experimental data. Increasing the temperature and incubation time of enzymatic hydrolysis greater than 65 °C and 120 min haven’t led to a further increase in juice yield too. The optimal parameters were established: temperature — ~ 52 °C, incubation time — ~ 85 min, concentration of Vegazim P-CS — ~ 0,3 ml/1000 g of carrot pulp. The obtained data demonstrate differences in the action of enzyme preparations, show feasibility of optimizing the enzymatic treatment parameters for a particular enzyme preparation according to the manufacturer’s goals.","PeriodicalId":148431,"journal":{"name":"Journal International Academy of Refrigeration","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128941593","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.17586/1606-4313-2021-20-3-5-14
D. Artemyev, A. V. Zaitsev, R. Sanavbarov
Проведено исследование по изучению процесса теплопередачи, происходящего в кожухотрубных теплообменных аппаратах между азотом в межтрубном пространстве в качестве рабочей среды и природным газом в трубном пространстве. В ходе исследования моделируются процессы теплопередачи с применением программного обеспечения HTRI. Пакет HTRI предназначен для создания и исследования виртуальной копии теплообменника, а также прогнозирования параметров термодинамических процессов. Результатом моделирования является расчет изменения теплофизических свойств рабочих веществ (энтальпии, теплоемкости, плотности и теплопроводности) в зависимости от изменения температуры, рассматриваются и исследуются такие физические и термодинамические процессы, как изменение скоростей в трубном и межтрубном пространстве, распределение температур в трубном и межтрубном пространстве по длине, коэффициенты теплоотдачи. Помимо этого, на основе изменения чисел Рейнольдса определяются режимы течения рабочих сред в трубах и кожухе и с учетом изменения коэффициентов теплоотдачи азота и природного газа, рассматривается изменение коэффициента теплопередачи по длине теплообменного аппарата, анализируется увеличение тепловой нагрузки. Ключевые слова: теплопередача, теплообменный аппарат, природный газ, моделирование термодинамических процессов.
{"title":"Simulation of heat transfer process in shell-and-tube heat exchanger","authors":"D. Artemyev, A. V. Zaitsev, R. Sanavbarov","doi":"10.17586/1606-4313-2021-20-3-5-14","DOIUrl":"https://doi.org/10.17586/1606-4313-2021-20-3-5-14","url":null,"abstract":"Проведено исследование по изучению процесса теплопередачи, происходящего в кожухотрубных теплообменных аппаратах между азотом в межтрубном пространстве в качестве рабочей среды и природным газом в трубном пространстве. В ходе исследования моделируются процессы теплопередачи с применением программного обеспечения HTRI. Пакет HTRI предназначен для создания и исследования виртуальной копии теплообменника, а также прогнозирования параметров термодинамических процессов. Результатом моделирования является расчет изменения теплофизических свойств рабочих веществ (энтальпии, теплоемкости, плотности и теплопроводности) в зависимости от изменения температуры, рассматриваются и исследуются такие физические и термодинамические процессы, как изменение скоростей в трубном и межтрубном пространстве, распределение температур в трубном и межтрубном пространстве по длине, коэффициенты теплоотдачи. Помимо этого, на основе изменения чисел Рейнольдса определяются режимы течения рабочих сред в трубах и кожухе и с учетом изменения коэффициентов теплоотдачи азота и природного газа, рассматривается изменение коэффициента теплопередачи по длине теплообменного аппарата, анализируется увеличение тепловой нагрузки. Ключевые слова: теплопередача, теплообменный аппарат, природный газ, моделирование термодинамических процессов.","PeriodicalId":148431,"journal":{"name":"Journal International Academy of Refrigeration","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128558227","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.17586/1606-4313-2023-22-2-75-81
T. Meledina, M.N. Kuntsova, S.G. Davydenko, D. V. Manshin
{"title":"Mannoproteins and their isolation from yeast cells","authors":"T. Meledina, M.N. Kuntsova, S.G. Davydenko, D. V. Manshin","doi":"10.17586/1606-4313-2023-22-2-75-81","DOIUrl":"https://doi.org/10.17586/1606-4313-2023-22-2-75-81","url":null,"abstract":"","PeriodicalId":148431,"journal":{"name":"Journal International Academy of Refrigeration","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115480201","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.17586/1606-4313-2022-21-2-13-20
V. Pronin, V. Tsvetkov, A. Kovanov, E. N. Mikhailova
Currently, robust and energy efficient screw compressors are in high demand. One of the promising trends in this filed is the development of the screw compressors with built-in capacity control. The article describes the design and operation principles of a built-in capacity control in the form of rotary adjustment ring for screw single-rotor compressor with a circular cut-off tooth. The calculation techniques for the volumetric capacity of screw single-rotor compressor during its regulation by mathematical modelling are described in detail. The results obtained contribute to the development and algorithmization of the theoretical base for the control of screw single-rotor compressor capacity.
{"title":"Mathematical model for capacity regulation of screw single-rotor compressor by capacity control in the form of rotary adjustment ring","authors":"V. Pronin, V. Tsvetkov, A. Kovanov, E. N. Mikhailova","doi":"10.17586/1606-4313-2022-21-2-13-20","DOIUrl":"https://doi.org/10.17586/1606-4313-2022-21-2-13-20","url":null,"abstract":"Currently, robust and energy efficient screw compressors are in high demand. One of the promising trends in this filed is the development of the screw compressors with built-in capacity control. The article describes the design and operation principles of a built-in capacity control in the form of rotary adjustment ring for screw single-rotor compressor with a circular cut-off tooth. The calculation techniques for the volumetric capacity of screw single-rotor compressor during its regulation by mathematical modelling are described in detail. The results obtained contribute to the development and algorithmization of the theoretical base for the control of screw single-rotor compressor capacity.","PeriodicalId":148431,"journal":{"name":"Journal International Academy of Refrigeration","volume":"109 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115319151","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.17586/1606-4313-2022-21-4-37-44
I. Volkov
{"title":"Perspectives of controlling whipped yeast-free dough making","authors":"I. Volkov","doi":"10.17586/1606-4313-2022-21-4-37-44","DOIUrl":"https://doi.org/10.17586/1606-4313-2022-21-4-37-44","url":null,"abstract":"","PeriodicalId":148431,"journal":{"name":"Journal International Academy of Refrigeration","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126965091","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.17586/1606-4313-2021-20-2-73-78
A. G. Belozerov, E. V. Semenov, S. B. Babakin
Based on the modified solution of Stefan task for phase transition in a soil prototype in the form of half-space, an algorithm of calculating temperature distribution over time and soil depth, proposed by the authors, is substantiated. The data on the temperature at a particular location of the Taymyr Peninsula taken in summer 2011 are used for the purpose. Staring from 0 a. m. (local time) on July, 1st, every ten days of the period under consideration the temperature values for the soil surface and the soli at the depth of 0.6 and 0.9 m were taken for the analysis. Numerical modelling as well as quantity and quality analysis for temperature stratification over time and soli depth have been made on the basis of the algorithm developed. The proposed calculation technique, based on modern information technologies, is of great practical perspective.
{"title":"Experimental modelling of soil thawing","authors":"A. G. Belozerov, E. V. Semenov, S. B. Babakin","doi":"10.17586/1606-4313-2021-20-2-73-78","DOIUrl":"https://doi.org/10.17586/1606-4313-2021-20-2-73-78","url":null,"abstract":"Based on the modified solution of Stefan task for phase transition in a soil prototype in the form of half-space, an algorithm of calculating temperature distribution over time and soil depth, proposed by the authors, is substantiated. The data on the temperature at a particular location of the Taymyr Peninsula taken in summer 2011 are used for the purpose. Staring from 0 a. m. (local time) on July, 1st, every ten days of the period under consideration the temperature values for the soil surface and the soli at the depth of 0.6 and 0.9 m were taken for the analysis. Numerical modelling as well as quantity and quality analysis for temperature stratification over time and soli depth have been made on the basis of the algorithm developed. The proposed calculation technique, based on modern information technologies, is of great practical perspective.","PeriodicalId":148431,"journal":{"name":"Journal International Academy of Refrigeration","volume":"216 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125839530","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.17586/1606-4313-2021-20-3-65-74
S. Rykov, I. Kudryavtseva, P. V. Popov, M. Nurysheva
A critical analysis of the available information on the density r ± and pressure p s of the R-245fa refrigerant on the line of phase equilibrium (LPE) has been carried out and a mathematical model of LPE has been proposed that transmits this information within the limits of its uncertainty. The LPE model was developed within the framework of the Clapeyron-Clausius and Mendeleev-Clapeyron equations, the model [2β, 1 – α] of the average diameter f d : f , where α and β are the critical indices; τ = T/T c – 1, and the equation of the «apparent» heat of vaporization, developed within the framework of the large-scale theory. It is shown that in the temperature range from T t = 171.05 K to the critical temperature T c = 427.01 K, the proposed LPE model transmits data on r ± and p s of R-245fa within the limits of their experimental uncertainty; the RSM (Root-mean square deviation) values are given, which for the most reliable data were compiled by: Feng et al. (2010), RSM (p s ) = 0,063 %; Wang et al. (2004), RSM (p s ) = 0,021 %; Semenyuk Yu. V. et al. (2006), RSM (p + ) = 0,087 %. It is shown that the combined use of the parameter, the Mendeleev–Clapeyron equation and the Clapeyron equation can significantly increase the reliability of the calculated information about the density ρ – in the vicinity of the triple point.
{"title":"R-245fa phase equilibrium line modeling method","authors":"S. Rykov, I. Kudryavtseva, P. V. Popov, M. Nurysheva","doi":"10.17586/1606-4313-2021-20-3-65-74","DOIUrl":"https://doi.org/10.17586/1606-4313-2021-20-3-65-74","url":null,"abstract":"A critical analysis of the available information on the density r ± and pressure p s of the R-245fa refrigerant on the line of phase equilibrium (LPE) has been carried out and a mathematical model of LPE has been proposed that transmits this information within the limits of its uncertainty. The LPE model was developed within the framework of the Clapeyron-Clausius and Mendeleev-Clapeyron equations, the model [2β, 1 – α] of the average diameter f d : f , where α and β are the critical indices; τ = T/T c – 1, and the equation of the «apparent» heat of vaporization, developed within the framework of the large-scale theory. It is shown that in the temperature range from T t = 171.05 K to the critical temperature T c = 427.01 K, the proposed LPE model transmits data on r ± and p s of R-245fa within the limits of their experimental uncertainty; the RSM (Root-mean square deviation) values are given, which for the most reliable data were compiled by: Feng et al. (2010), RSM (p s ) = 0,063 %; Wang et al. (2004), RSM (p s ) = 0,021 %; Semenyuk Yu. V. et al. (2006), RSM (p + ) = 0,087 %. It is shown that the combined use of the parameter, the Mendeleev–Clapeyron equation and the Clapeyron equation can significantly increase the reliability of the calculated information about the density ρ – in the vicinity of the triple point.","PeriodicalId":148431,"journal":{"name":"Journal International Academy of Refrigeration","volume":"428 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126080275","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：