International Journal of Air-conditioning and Refrigeration最新文献_第7页

CFD Modeling and Performance Analysis of a Thermoacoustically Driven Thermoacoustic Refrigerator 热声驱动热声制冷机的CFD建模与性能分析

IF 1

International Journal of Air-conditioning and Refrigeration Pub Date : 2021-09-23 DOI: 10.1142/s2010132521500292

Zahra Bouramdane, A. Bah, Mohammed Alaoui, N. Martaj

{"title":"CFD Modeling and Performance Analysis of a Thermoacoustically Driven Thermoacoustic Refrigerator","authors":"Zahra Bouramdane, A. Bah, Mohammed Alaoui, N. Martaj","doi":"10.1142/s2010132521500292","DOIUrl":"https://doi.org/10.1142/s2010132521500292","url":null,"abstract":"Although thermoacoustic devices comprise simple components, the design of these machines is very challenging. In order to predict the behavior and optimize the performance of a thermoacoustic refrigerator driven by a standing-wave thermoacoustic engine, considering the changes in geometrical parameters, two analogies have been presented in this paper. The first analogy is based on CFD analysis where a 2D model is implemented to investigate the influence of stack parameters on the refrigerator performance, to analyze the time variation of the temperature gradient across the stack, and to examine the refrigerator performance in terms of refrigeration temperature. The second analogy is based on the use of an optimization algorithm based on the simplified linear thermoacoustic theory applied for designing thermoacoustic refrigerators with different stack parameters and operating conditions. Simulation results show that the engine produced a high-powered acoustic wave with a pressure amplitude of 23[Formula: see text]kPa and a frequency of 584[Formula: see text]Hz and this wave applies a temperature difference across the refrigeration stack with a cooling temperature of 292.8[Formula: see text]K when the stacks are positioned next to the pressure antinode. The results from the algorithm give the ability to design any thermoacoustic refrigerator with high performance by picking the appropriate parameters.","PeriodicalId":13757,"journal":{"name":"International Journal of Air-conditioning and Refrigeration","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2021-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75802768","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

An Experimental Investigation on Vapor Compression Refrigeration System Cascaded with Ejector Refrigeration System 喷射器级联蒸汽压缩制冷系统的实验研究

IF 1

International Journal of Air-conditioning and Refrigeration Pub Date : 2021-09-01 DOI: 10.1142/s2010132521500280

Vikas Kumar, G. Sachdeva, Sandeep Tiwari, P. Anuradha, V. Jain

引用次数: 1

Effect of Gas Blockage on the Theoretical Performance of Thermoacoustic Refrigerators 气体堵塞对热声制冷机理论性能的影响

IF 1

International Journal of Air-conditioning and Refrigeration Pub Date : 2021-09-01 DOI: 10.1142/s2010132521500267

B. Prashantha, G. Narasimham, S. Seetharamu, K. Manjunatha

{"title":"Effect of Gas Blockage on the Theoretical Performance of Thermoacoustic Refrigerators","authors":"B. Prashantha, G. Narasimham, S. Seetharamu, K. Manjunatha","doi":"10.1142/s2010132521500267","DOIUrl":"https://doi.org/10.1142/s2010132521500267","url":null,"abstract":"Thermoacoustic refrigeration is an emerging green, novel and promising alternate technology compared to vapor compression refrigerator systems for domestic cooling. It uses environmentally benign gases like air or helium or the mixture of inert gases as working substances and has no moving parts, no lubrication and no vibration. The cooler is designed and optimized with helium and air as refrigerants operating at 10[Formula: see text]bar with 3% drive ratio for the temperature difference of 28[Formula: see text]K and stack diameter of 200[Formula: see text]mm using linear thermoacoustic theory. In this paper, the effect of gas blockage (porosity) of the spiral-stack heat exchanger system ranging from 45% to 85% on the theoretical performance of the cooler is discussed. The one-third and one-fourth wavelength convergent–divergent resonator designs are optimized with air and helium as working substances, respectively, to improve performance and power density. The optimized coolers show best performance with 85% porosity. The theoretical results are validated with DeltaEC software simulation results. The simulation results show the coefficient of performance and cooling capacity of 0.93 and 219[Formula: see text]W for helium and of 0.50 and 139[Formula: see text]W for air, respectively, at the cold heat exchanger temperature of 0∘C.","PeriodicalId":13757,"journal":{"name":"International Journal of Air-conditioning and Refrigeration","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77492275","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: 3

Exergy Analysis of an Ejector Cooling System by Modified Gouy–Stodola Equation 用修正的Gouy-Stodola方程分析喷射器冷却系统的火用

IF 1

International Journal of Air-conditioning and Refrigeration Pub Date : 2021-09-01 DOI: 10.1142/s2010132521500279

G. Sachdeva, B. Sharma

{"title":"Exergy Analysis of an Ejector Cooling System by Modified Gouy–Stodola Equation","authors":"G. Sachdeva, B. Sharma","doi":"10.1142/s2010132521500279","DOIUrl":"https://doi.org/10.1142/s2010132521500279","url":null,"abstract":"In this paper, exergy destruction analysis of a heat-assisted ejector cooling system has been carried out using a modified Gouy–Stodola equation. The modified Gouy–Stodola equation provides a more accurate and realistic irreversibility analysis of the system than the conventional Gouy–Stodola formulation. The coefficient of structural bond (CSB) analysis has also been executed to find the component whose operating variables affect the system’s total irreversibility at the most. Exergy analysis revealed that the maximum exergy loss happens in the ejector followed by the generator and condenser. The model predicted 40.84% of total irreversibility in the ejector at the designed conditions. However, total exergy destruction is found to be the most sensitive to the evaporator temperature. The CSB value of 12.97 is obtained in the evaporator using the modified exergy method. The generator appears to be the second sensitive component with the CSB value of 2.42, followed by the condenser with the CSB value of 1.628. The coefficient of performance of the system is found to be 0.18 at the designed conditions. The refrigerant R1234yf is considered in the system.","PeriodicalId":13757,"journal":{"name":"International Journal of Air-conditioning and Refrigeration","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75273013","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

Properties and Performance of Eco-Friendly Hydro-Fluoro-Olefin (HFO) Refrigerant-R1234yf: Part I 环保型氢氟烯烃(HFO)制冷剂r1234yf的性质与性能:第一部分

IF 1

International Journal of Air-conditioning and Refrigeration Pub Date : 2021-08-28 DOI: 10.1142/s2010132521300056

B. S. Bibin, Edison Gundabattini

{"title":"Properties and Performance of Eco-Friendly Hydro-Fluoro-Olefin (HFO) Refrigerant-R1234yf: Part I","authors":"B. S. Bibin, Edison Gundabattini","doi":"10.1142/s2010132521300056","DOIUrl":"https://doi.org/10.1142/s2010132521300056","url":null,"abstract":"The creation of new age refrigerants might be the answer to the issue of an Earth-wide rise in temperature. Hence, while choosing new refrigerants a careful process is required. The general effect of any refrigerant substance on global warming, energy efficiency, ozone depletion, cost-effectiveness, chemical stability, and safety ought to be assessed. This paper sums up the experimental and numerical investigations directed with the globally accepted R1234yf refrigerant. The paper’s principal points are to assess the capability of the hydro-fluoro-olefin (HFO) refrigerant mainly R1234yf utilized in the refrigeration system (vapor compression systems, domestic refrigeration system) and to explore its utilization as an eco-friendly refrigerant. In the vapor compression refrigeration system, the cooling capacity and coefficient of performance of R1234yf are found to be less, 9% and 11%, respectively compared to that of R134a. But the power consumption of the system with R1234yf increased between 1.6% and 6.7% when compared to R134a. This paper likewise assists with recognizing the gap in the past research works and explores the possibilities for additional works.","PeriodicalId":13757,"journal":{"name":"International Journal of Air-conditioning and Refrigeration","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2021-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90719085","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: 3

A Review on Flow Characteristics of the Straight and Coiled Capillary Tubes 直管和盘管毛细管流动特性研究进展

IF 1

International Journal of Air-conditioning and Refrigeration Pub Date : 2021-08-26 DOI: 10.1142/s2010132521300044

P. Jadhav, N. Agrawal

{"title":"A Review on Flow Characteristics of the Straight and Coiled Capillary Tubes","authors":"P. Jadhav, N. Agrawal","doi":"10.1142/s2010132521300044","DOIUrl":"https://doi.org/10.1142/s2010132521300044","url":null,"abstract":"A detailed literature review on the flow characterization of the capillary tubes is presented in this paper. The flow behavior is reviewed for straight, helically, and spirally coiled capillary tubes at different operating and geometric conditions by considering various aspects in the tube. This paper summarizes experimental and numerical study on the adiabatic and nonadiabatic straight and coiled capillary tubes at different geometries conditions. The vital information of the range of the tube geometry and operating conditions are discussed, which can be utilized for further studies on the capillary tube. Various methodologies with generalized correlations are indicated. It has been observed that there are even more studies need to do with environmentally friendly refrigerants with various practical aspects in the capillary tube. It would be interesting to find the coiling effect on the design and simulation of the capillary tube. In addition to that more experimental and numerical studies need to explore the nonadiabatic coiled capillary tube. It would be fascinating to study the metastable condition in the capillary tube and set suitable relations to present its effect on the mass flow rate.","PeriodicalId":13757,"journal":{"name":"International Journal of Air-conditioning and Refrigeration","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2021-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82732164","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

Energetic, Exergetic, Environmental, and Economic Assessment of a Cascade Refrigeration System Operating with Four Different Ecological Refrigerant Pairs 具有四种不同生态制冷剂对的梯级制冷系统运行的能量、活力、环境和经济评估

IF 1

International Journal of Air-conditioning and Refrigeration Pub Date : 2021-08-23 DOI: 10.1142/s2010132521500255

Cleison Henrique de Paula, W. M. Duarte, Thiago Torres Martins Rocha, Raphael Nunes de Oliveira, A. Maia

{"title":"Energetic, Exergetic, Environmental, and Economic Assessment of a Cascade Refrigeration System Operating with Four Different Ecological Refrigerant Pairs","authors":"Cleison Henrique de Paula, W. M. Duarte, Thiago Torres Martins Rocha, Raphael Nunes de Oliveira, A. Maia","doi":"10.1142/s2010132521500255","DOIUrl":"https://doi.org/10.1142/s2010132521500255","url":null,"abstract":"In this work, a cascade refrigeration system operating with four different ecological refrigerant pairs was modeled. This system uses R744 (Carbon dioxide) in the low-temperature cycle and operates with R290 (propane), R1234yf (2,3,3,3-tetrafluoropropene), R152a (1,1-difluorethane), and R717 (ammonia) in the high-temperature cycle. Energetic, exergetic, environmental, and economic performance of the cascade system was investigated to determine the most appropriate ecological refrigerant couple. The parameters used in each mentioned performance were COP (Coefficient of Performance), [Formula: see text] (Exergy Efficiency), TEWI (Total Equivalent Warming Impact), ECOP (Ecological coefficient of performance), and [Formula: see text] (Total plant cost rate), respectively. The results showed that the cascade refrigeration system operating with R744/R717 provided the best performance for the thermodynamic conditions analyzed, presenting a COP of 2.10, [Formula: see text] of 56.9%, [Formula: see text] of 24 334 USD/year, ECOP of 4.86, and TEWI of 25.67 tons of CO2. Finally, evaluating the total plant cost rate of this cascade system, it was noted that the capital and maintenance cost rate [Formula: see text] corresponds to 89.1% of the [Formula: see text] value, the operational cost rate [Formula: see text] corresponds to 10.27% of the [Formula: see text] value and the environmental cost rate [Formula: see text] corresponds to 0.63% of [Formula: see text].","PeriodicalId":13757,"journal":{"name":"International Journal of Air-conditioning and Refrigeration","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2021-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85960093","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

Sustainable Energy Techniques Adapted in Buildings to Regulate Moisture Transport and Enhance Thermal Comfort: A Review 可持续能源技术在建筑中的应用:调节水分输送和提高热舒适

IF 1

International Journal of Air-conditioning and Refrigeration Pub Date : 2021-08-19 DOI: 10.1142/s2010132521300032

S. Salins, Shiva Kumar, S. Reddy, Avin Vivek Kuniyil, S. Kumar

引用次数: 2

Thermodynamic Analysis of an Auto-Cascade Freezer Cycle at Different Loads of Evaporators 不同蒸发器负荷下自动复叠冷冻循环的热力学分析

IF 1

International Journal of Air-conditioning and Refrigeration Pub Date : 2021-08-18 DOI: 10.1142/s2010132521500243

Ayça Atamtürk, Serhan Küçüka

引用次数: 0

Performance Evaluation of Modified Low-Temperature Cascade (MLTC) Type Refrigeration System 改进型低温串级制冷系统的性能评价

IF 1

International Journal of Air-conditioning and Refrigeration Pub Date : 2021-07-15 DOI: 10.1142/S2010132521500231

Mohd Waseem Siddiqui, NishithKr. Das, R. Sahoo

引用次数: 0