Refrigeration Technology最新文献

PROCEDURE FOR CALCULATION AND ANALYSIS OF TRANSCRITICAL CYCLE CO2 WITH PARALLEL COMPRESSION AND EJECTOR 采用并联压缩和喷射器的跨临界循环 CO2 的计算和分析程序

Refrigeration Technology Pub Date : 2024-03-02 DOI: 10.17816/rf322752

M. Talyzin

{"title":"PROCEDURE FOR CALCULATION AND ANALYSIS OF TRANSCRITICAL CYCLE CO2 WITH PARALLEL COMPRESSION AND EJECTOR","authors":"M. Talyzin","doi":"10.17816/rf322752","DOIUrl":"https://doi.org/10.17816/rf322752","url":null,"abstract":"Attempts to reduce the negative impact on the environment have led, among other things, to the use of so-called natural refrigerants. One of which is SO2. \u0000At food processing enterprises, this refrigerant is used in two main cycles - cascade and transcritical. \u0000Along with the negative impact on the environment, it is also necessary to take into account the increase in the efficiency of refrigeration plants, which is especially important for transcritical cycles. \u0000The purpose of the study was to develop a method for calculating and analyzing the transcritical cycle of SO2 with parallel compression and an ejector. \u0000The calculation of the transcritical cycle is based on the fundamental laws of thermodynamics, the analysis method is based on the entropy-statistical method of thermodynamic analysis. Cycle calculation includes analysis of compression loss by system components. \u0000Description of operation of transcritical cycle of SO2 with parallel compression and ejector with two temperature levels is given, procedure of calculation and analysis of losses in elements of refrigerating unit operating according to transcritical cycle of SO2 with parallel compression and ejector is given. \u0000The use of this method allows you to identify the elements and processes with the greatest losses and take further measures to improve the efficiency of the refrigeration system.","PeriodicalId":474590,"journal":{"name":"Refrigeration Technology","volume":"32 43","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140081515","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

later 之后

Refrigeration Technology Pub Date : 2024-03-02 DOI: 10.17816/rf551801

A. A. Zharov, Anastasiya A. Kazakova, Mikael A. Grigoryan, Nikita A. Kovalchuk

引用次数: 0

A modified efficiency-NTU method (m-ε-NTU) for calculating air coolers in dehumidifying or frost conditions. Part IV 用于计算除湿或结霜条件下空气冷却器的修正效率-NTU 法（m-ε-NTU）。第四部分

Refrigeration Technology Pub Date : 2024-03-02 DOI: 10.17816/rf108668

V. A. Portyanikhin

引用次数: 0

METHOD FOR EVALUATING EFFICIENCY OF REFRIGERATION UNITS BASED ON COMPRESSION CYCLE WITH ECONOMIZER 基于带省煤器压缩循环的制冷装置效率评估方法

Refrigeration Technology Pub Date : 2024-03-02 DOI: 10.17816/rf322753

M. Talyzin

{"title":"METHOD FOR EVALUATING EFFICIENCY OF REFRIGERATION UNITS BASED ON COMPRESSION CYCLE WITH ECONOMIZER","authors":"M. Talyzin","doi":"10.17816/rf322753","DOIUrl":"https://doi.org/10.17816/rf322753","url":null,"abstract":"The transition to the so-called \"digital economy\" requires the development of automation tools, and, therefore, algorithms based on which it will be possible to create intelligent control systems. \u0000At the same time, do not forget that the control and monitoring tools themselves are not an end in themselves. Automation must solve certain problems, relying on a data collection system (monitoring system). One of these tasks is energy saving. Since the share of electricity costs for refrigeration equipment is a significant part of the country's energy balance, energy conservation issues are paid a lot of attention at the state level (Federal Law No. 261-FZ \"On Energy Saving and Energy Efficiency and on Amending Certain Legislative Acts of the Russian Federation\"). \u0000Existing systems for monitoring the operating parameters of a refrigeration plant are often used only to detect emergencies and alarm them, however, an intelligent analysis system can be built on the basis of recorded data to optimize the operation of the refrigeration plant in real time. \u0000This article describes the methodology for assessing the energy efficiency of refrigeration plants operating on a cycle with an economizer and allowing to evaluate both at the design stage and during the operation of the refrigeration plant, and allows to obtain a distribution of losses by elements and processes of the refrigeration plant.","PeriodicalId":474590,"journal":{"name":"Refrigeration Technology","volume":"13 14","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140082269","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

Experimental studies of the properties of ozone-safe refrigerant R1234yf and their modeling using various equations of state 臭氧安全制冷剂 R1234yf 性能的实验研究及其使用各种状态方程的建模研究

Refrigeration Technology Pub Date : 2024-03-02 DOI: 10.17816/rf626383

A. Valiakina, Vladimir V. Dolya

引用次数: 0

On the issue of increasing humidity in ice arenas and ways to solve it 关于冰场湿度增加的问题及解决方法

Refrigeration Technology Pub Date : 2024-03-02 DOI: 10.17816/rf108646

E. Neverov, I. Korotkiy, A. Kozaev, P. Korotkih, D. I. Goleshov

{"title":"On the issue of increasing humidity in ice arenas and ways to solve it","authors":"E. Neverov, I. Korotkiy, A. Kozaev, P. Korotkih, D. I. Goleshov","doi":"10.17816/rf108646","DOIUrl":"https://doi.org/10.17816/rf108646","url":null,"abstract":"В данной статье поднимается проблема повышенной остроты ледовой арены в городе Сочи, которая решается, используя типовые решения для систем вентиляции и кондиционирования. В работе была исследована структура системы вентиляции, которая также была выделена причинами повышенной интенсивности воздуха влага, находящаяся в виде водяного пара и холодной поверхности льда, в свою очередь охлаждающая окружающее пространство и предметы. Последствиями такого состояния воздуха являются: образование тумана над поверхностью льда; образование конденсата, который в свою очередь ухудшает качество своего ледового покрытия; стальных и железных конструкций; появление плесени. Помимо этого, микроклимат в салоне становится некомфортным для наблюдения за людьми. В ходе исследования были выделены несколько факторов, позволяющих использовать параметры воздуха внутри помещений. Одним из таких случаев стало сорбционное осушение. Эта система склонна к пониженной температуре, а также способна справляться даже с повышенной сыростью, но требует существенных затрат. Вторым способом, более ранней и эффективной является ассимиляция. Этот способ основан на способности тепловоздушной массы удерживать большее количество водяных паров. Данный вариант параметров воздуха более эффективен, когда требуется доработать уже существующую систему вентиляции. В нашем случае на ледовой арене в городе Сочи более эффективно было реализовано применение ассимиляции. В имеющуюся вентиляционную установку было произведено применение респираторного оборудования воздухоохладителей с каплеуловителем. Расчет применяемых теплообменных аппаратов реализован с помощью программы ППВО.","PeriodicalId":474590,"journal":{"name":"Refrigeration Technology","volume":"10 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140082047","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

later 之后

Refrigeration Technology Pub Date : 2024-03-02 DOI: 10.17816/rf551956

I. Tishchenko, S. A. Abalakin, V. I. Merkulov, A. A. Zharov, A. V. Borisenko

引用次数: 0

Theoretical basis and practical implementation of “bi-refrigerant” and “two-compressor” refrigeration machine schemes 双制冷剂 "和 "双压缩机 "制冷机方案的理论基础和实际应用

Refrigeration Technology Pub Date : 2023-12-02 DOI: 10.17816/rf588066

Ivan Syazin, A. Gukasyan

{"title":"Theoretical basis and practical implementation of “bi-refrigerant” and “two-compressor” refrigeration machine schemes","authors":"Ivan Syazin, A. Gukasyan","doi":"10.17816/rf588066","DOIUrl":"https://doi.org/10.17816/rf588066","url":null,"abstract":"The operating conditions of the refrigeration machine determine its energy efficiency. Some industries, in particular in the food industry, are characterized by seasonal (short-term) consumption of cold in the low temperature range (-40 ℃ and below), when rapid freezing of the product is required to achieve its high quality due to finely dispersed crystallization of moisture and a shock temperature for psychrophilic microorganisms. Based on this problem, it becomes advisable to periodically use a low-temperature refrigerant, which, from a rational technical point of view, is not always combined with the constant required temperature of refrigerated storage due to possible operation in vacuum conditions and other difficulties. Often the difference between the temperature regime of the required short-term (seasonal or periodic) processing and the constant (main) temperature regime (for example, refrigerated storage of products) reaches 20 ℃ or more, which imposes certain restrictions on the design or operation of the refrigeration machine. In this regard, small and medium-sized refrigeration machines with the ability to operate on two refrigerants (for example, low-temperature and medium-temperature, with periodic automatic mutual replacement) are more promising. Such a refrigeration machine is conventionally called bi-refrigerant in the article. The above difficulties are also solved by the presented scheme of a two-compressor refrigeration machine, in which the possibility of its operation is realized during periodic change of modes from one-stage to two-stage and vice versa, according to the need for the corresponding differences in boiling and condensation pressures","PeriodicalId":474590,"journal":{"name":"Refrigeration Technology","volume":"116 36","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138607584","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

Adjustable partial body cryotherapy 可调节的部分身体冷冻疗法

Refrigeration Technology Pub Date : 2023-12-01 DOI: 10.17816/rf609501

Alexey V. Shakurov

{"title":"Adjustable partial body cryotherapy","authors":"Alexey V. Shakurov","doi":"10.17816/rf609501","DOIUrl":"https://doi.org/10.17816/rf609501","url":null,"abstract":"Based on an analysis of the technical level of equipment that implements cryotherapy, the problem of increasing the accuracy of dosing and, accordingly, accurate and uniform cooling of a biological object was identified, which required research into the issues of its controlled cooling. A software for predicting the result of cryotherapy has been developed and a range of rational parameters for supplying gas to the cabin of the installation has been determined when performing controlled cryotherapy (from 40 to 70 g/sec, from -140 to -160 C). An experimental model of a new type of installation has been developed and created, which allows cryotherapy to be carried out with changes in the main parameters of the equipment operation in a wide range of cooling gas flow temperature from -50 to -160 C, free-flow velocity from 0.1 to 2 m/s, cryotherapy time up to 420 sec. Together with a predicting software, it forms a complex for research and controlled implementation of cryotherapy in a wide range of operating parameters. Algorithms for implementing regulated modes for various biological objects and various purposes of exposure have been developed and recommendations have been developed, which allows for the practical application of the proposed concept.","PeriodicalId":474590,"journal":{"name":"Refrigeration Technology","volume":" 23","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138620874","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

Substantiation of the possibility of gas liquefaction in oil-free low-speed refrigeration compressors 证明无油低速制冷压缩机中气体液化的可能性

Refrigeration Technology Pub Date : 2023-12-01 DOI: 10.17816/rf513731

Sergey Busarov, Aleksey Nedovenchanyi, Aleksandra Kapeluhovskay

{"title":"Substantiation of the possibility of gas liquefaction in oil-free low-speed refrigeration compressors","authors":"Sergey Busarov, Aleksey Nedovenchanyi, Aleksandra Kapeluhovskay","doi":"10.17816/rf513731","DOIUrl":"https://doi.org/10.17816/rf513731","url":null,"abstract":"Existing refrigeration machines, as you know, contain the main four units that carry out the Existing refrigeration machines, as is known, contain four main components that carry out the refrigeration cycle: compressor, condenser, expander and evaporator. Currently, the liquefaction of the refrigerant occurs in the condenser. Creating conditions under which condensation of the working fluid would occur in the compressor unit would make it possible to create a compact refrigeration machine by eliminating the condenser from it. \u0000The purpose of this work is to prove the possibility of creating a compact refrigeration machine with the implementation of the process of condensation of the working fluid in the compression chamber of the compressor. \u0000The object of the study is a low-speed compressor, in which the pressure ratio significantly exceeds known analogues and at the same time the temperature is significantly lower than high-speed machines due to the creation of conditions under which compression occurs with polytropic indicators below 1.08. The research method is based on determining the gas temperature at critical pressure and comparing the obtained result with the critical temperature. The system of equations and assumptions used relates to the model with lumped parameters of the working fluid. \u0000The results obtained on the compression of such refrigerants as ammonia, carbon dioxide, R12, R22, Freon-134a showed the possibility of obtaining the required pressures in a low-speed machine at temperatures significantly below the critical one. \u0000The work examines and proposes for further study those working fluids of refrigeration machines that, due to their characteristics and operating parameters in the refrigeration machine, can go into the liquid phase in a low-speed compressor unit, which, with further experimental confirmation, will allow partial or complete elimination of the condenser unit in the refrigeration machine.","PeriodicalId":474590,"journal":{"name":"Refrigeration Technology","volume":" 23","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138619126","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