Journal International Academy of Refrigeration最新文献_第10页

Analytical presentation of sea ice’s temperature profile in spring-summer period on the northern sea route 北方海路春夏期海冰温度剖面分析

Journal International Academy of Refrigeration Pub Date : 1900-01-01 DOI: 10.17586/1606-4313-2022-21-4-68-75

I. Veprinyak, S. Koshkin

引用次数: 0

Approach to computation of deformation friction force during chilled fish cutting 冷冻鱼切削变形摩擦力的计算方法

Journal International Academy of Refrigeration Pub Date : 1900-01-01 DOI: 10.17586/1606-4313-2019-18-4-49-56

O. V. Ageev, V. Naumov, J. A. Fatykhov, N. V. Samojlova

{"title":"Approach to computation of deformation friction force during chilled fish cutting","authors":"O. V. Ageev, V. Naumov, J. A. Fatykhov, N. V. Samojlova","doi":"10.17586/1606-4313-2019-18-4-49-56","DOIUrl":"https://doi.org/10.17586/1606-4313-2019-18-4-49-56","url":null,"abstract":"The approach to research of deformation friction forces during chilled fish cutting is proposed. The viscoelastic properties of chilled fish raw material are described by a three-element rheological model. The mathematical description of the knife rough surface profile in the form of a dimensionless periodic function with three harmonics has been used. The dimensionless contact pressures over the microprotrusions of the cutting body rough surface from the material has been analyzed. A mathematical model for computation the dimensional and dimensionless friction forces has been developed. It is shown that with an increase in the processing speed, the deformation component of the friction force tends to zero. Up to a certain sliding speed there is a full contact of the material with the irregularities of the edge. With an increase in elasticity and lengthening of the edge of the knife the considerated force increases monotonously. The dependence of the dimensionless width of the micro protrusions contact area with the material on elasticity is monotonic, and the dependence of the indicated dimensionless width on the dimensionless speed is nonmonotonic. With values of elasticity measure 5, dimensionless speed of 0.001; 0.03; and 0.12, maximum amplitude of contact pressure is 1.250; 1.973; and 3.635, respectively. With values of the elasticity measure 3; 5; 8; and 12, the minimum values of the dimensionless width of the contact pad are 0.615; 0.593; 0.575; and 0.563, respectively, the limit value is 0.679. With values of the elasticity measure 5; dimensionless length of the edge 10; 20; 30; and 50, values of the maximum deformation friction force are 9.345; 18.693; 28.040; and 46.724, respectively. With values of the dimensionless length of the edge 20; elasticity measures 2; 5; 8; and 12, values of maximum strength are 7.471; 18.693; 29.914; and 44.876, respectively.","PeriodicalId":148431,"journal":{"name":"Journal International Academy of Refrigeration","volume":"3 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":"128902035","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}

引用次数: 1

Comparative calculations of the heat transfer coefficient during refrigerant boiling in tubes 制冷剂管内沸腾传热系数的比较计算

Journal International Academy of Refrigeration Pub Date : 1900-01-01 DOI: 10.17586/1606-4313-2020-19-2-65-72

S. Koshelev, Yu.N. Slastikhin, A. I. Eideyus

{"title":"Comparative calculations of the heat transfer coefficient during refrigerant boiling in tubes","authors":"S. Koshelev, Yu.N. Slastikhin, A. I. Eideyus","doi":"10.17586/1606-4313-2020-19-2-65-72","DOIUrl":"https://doi.org/10.17586/1606-4313-2020-19-2-65-72","url":null,"abstract":"Статья подготовлена с целью выявления наиболее подходящих для инженерной практики методик расчета коэффициента теплоотдачи (КТО) при кипении хладагентов в горизонтальных трубах с внутренним диаметром dT > 3 мм. Сделан обзор методик расчета КТО. Обсуждаются условия, при которых методики расчета КТО в макро-каналах можно распространить на мини-каналы. Проведен анализ ряда опубликованных работ, посвященных оценке точности методик предсказания КТО при кипении жидкостей в трубах, выбрано по пять лучших методик. В разных сочетаниях к числу лучших отнесена 21 методика. Пять из них использовано в расчетах с помощью компьютерной программы. Определены средние КТО αci и по 15 другим методикам для 11 вариантов условий кипения хладагентов R134a, R22, R290, R32, R404A, R407C, R410A, R507. Охвачен диапазон изменения температуры кипения t0 = –15...+5 oC, диаметра dT = 6...13,84 мм, массовой скорости wρ = 100...500 кг/ (м2·с), плотности теплового потока q = 3750...15000 Вт/м2, массового паросодержания в начале зоны кипения хн = 0,01...0,1 и на выходе хв = 0,9...0,95. Сравнение результатов расчета проводилось по трем показателям, а к наиболее подходящим отнесены методики: которые при одинаковых исходных данных дают наиболее близкие значения среднего КТО; по которым отношения наибольшего КТО к наименьшему во всех вариантах не превышает 1,4 для всех хладагентов; а также локальные КТО по которым имеют наибольшие значения при паросодержаниях х, соответствующих кольцевому режиму потока. Указанным условиям удовлетворяют компьютерная программа со свидетельством No 2015610039, а также методики авторов Wattelet и др. (1994), Kattan и др. (1998), Fang и др. (2017), хотя последняя не учитывает изменения локальных КТО. Ключевые слова: хладагенты, кипение, горизонтальные трубы, коэффициент теплоотдачи, методики расчета, выбор.","PeriodicalId":148431,"journal":{"name":"Journal International Academy of Refrigeration","volume":"13 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":"128967641","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}

引用次数: 0

Nonparametric equation of state on the basis of the phenomenological theory of a critical point with the use of similarity theory 在临界点现象学理论的基础上，利用相似理论求解非参数状态方程

Journal International Academy of Refrigeration Pub Date : 1900-01-01 DOI: 10.17586/1606-4313-2020-19-2-79-85

S. Rykov, I. Kudryavtseva, V. Rykov, A. Sverdlov

引用次数: 1

Justification of energy efficient air handling processes in conditioning systems 空调系统中节能空气处理过程的论证

Journal International Academy of Refrigeration Pub Date : 1900-01-01 DOI: 10.17586/1606-4313-2021-20-3-23-31

A. S. Salman, A. Sulin, V. I. Lysev, T. Ryabova

引用次数: 0

Spring accumulators for mechatronic drives with energy recuperation in food industry equipment 用于食品工业设备中具有能量回收的机电驱动的弹簧蓄能器

Journal International Academy of Refrigeration Pub Date : 1900-01-01 DOI: 10.17586/1606-4313-2022-21-1-68-75

M. V. Zhavner, Yang Chuanchao, Li Sen

引用次数: 0

Energy complex on liquid methane integrated with air separation unit and low-temperature power plant 液态甲烷能源综合体与空分装置和低温发电厂相结合

Journal International Academy of Refrigeration Pub Date : 1900-01-01 DOI: 10.17586/1606-4313-2022-21-3-3-12

D. Uglanov, O. Tremkina, O. A. Manakova, A.B. Shimanova

引用次数: 0

Mathematical modeling of a thermoelectric system for local hypothermia of the periodontal region 牙周区域局部低温的热电系统的数学建模

Journal International Academy of Refrigeration Pub Date : 1900-01-01 DOI: 10.17586/1606-4313-2022-21-4-60-67

O. V. Yevdulov, S. G. Magomedova, R. Magomadov

引用次数: 0

Energy requirements for nitrogen cooling systems of WBC units WBC机组氮冷却系统的能量需求

Journal International Academy of Refrigeration Pub Date : 1900-01-01 DOI: 10.17586/1606-4313-2019-18-1-92-97

A. Baranov, O. Filatova, A. Vasilenok, A. V. Safonov, E. Sokolova

{"title":"Energy requirements for nitrogen cooling systems of WBC units","authors":"A. Baranov, O. Filatova, A. Vasilenok, A. V. Safonov, E. Sokolova","doi":"10.17586/1606-4313-2019-18-1-92-97","DOIUrl":"https://doi.org/10.17586/1606-4313-2019-18-1-92-97","url":null,"abstract":"D. Sc. A. Yu. BARANOV1, O. A. FILATOVA, A. V. VASILENOK, A. V. SAFONOV, E. V. SOKOLOVA 1abaranov@corp.ifmo.ru ITMO University Whole-body cryotherapy (WBC) technique is based on supercooling patient’s body to stimulate skin cold receptors at the depth of 0.15 мм form skin surface forming signal of maximum intensity at the temperature of –2 оС. Heat removal by gas with the temperature of not more than –130 оС allows localizing body supercooling zone at the depth of receptors. The research is made to estimate maximum intensity of heat removal and necessary power consumption. It allows determining requirements for power supply of WBC units that is crucial for efficiency and safety of WBC. The research is carried out by the mathematical models of WBC object (human body surface) and a unit of volume for WBC zone (patient’s cabin). Implementation of WBC technique is shown to require removing 3.8 kW of heat from patient’s body surface. Taking into account total refrigerating capacity the cryostatting system for single-seated WBC cabin has to remove as less as 6.4 kW of heat form the temperature level of –130 оС. Therefore, a refrigerator of 47 kW power or nitrogen cooling system with refrigerating medium consumption of 0.025 kg/s or 4.45 kg per procedure is necessary. The use of nitrogen cooling for WBC zone results is compact and mobile single-seated WBC units. Owing to high competitive advantages single-seated units for WBC are widely used in the world, they being used in Russian clinical practice for more than 20 years.","PeriodicalId":148431,"journal":{"name":"Journal International Academy of Refrigeration","volume":"36 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":"126933674","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}

引用次数: 2

Characteristics of the nitrogen gas cycle for small scale LNG production 小型LNG生产中氮气循环的特点

Journal International Academy of Refrigeration Pub Date : 1900-01-01 DOI: 10.17586/1606-4313-2023-22-2-34-39

S. Vizgalov, I. Khisameev

引用次数: 0