International Journal of Air-conditioning and Refrigeration最新文献_第8页

Experimentally Validated Model of a Domestic Refrigerator with an Immersed Condenser Coil for Water Heating 浸没式冷凝器盘管家用制冷机水加热实验验证模型

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International Journal of Air-conditioning and Refrigeration Pub Date : 2021-07-03 DOI: 10.1142/s201013252150022x

Sami Missaoui, Z. Driss, R. Slama, B. Chaouachi

{"title":"Experimentally Validated Model of a Domestic Refrigerator with an Immersed Condenser Coil for Water Heating","authors":"Sami Missaoui, Z. Driss, R. Slama, B. Chaouachi","doi":"10.1142/s201013252150022x","DOIUrl":"https://doi.org/10.1142/s201013252150022x","url":null,"abstract":"This study presents a coupled model to simulate the heat transfer process between the helical condenser coil and the water inside the tank. This coupled model was developed using ANSYS Fluent Computational Fluid Dynamics (CFD). The heat flux of the condenser coils is obtained from our experimental investigation and delivered as initial boundary conditions to the tank model. The results obtained are considered essential and are, in turn, capable of assessing the performance of the modified domestic refrigerator for the production of hot water. According to this model, the results confirmed that the coefficient of heat transfer and the performance of the system decreased with an increase in the heating time. The natural heat transfer coefficient Uc falls from 727.26[Formula: see text]W [Formula: see text] m[Formula: see text] [Formula: see text] K[Formula: see text] to 68.64[Formula: see text]W [Formula: see text] m[Formula: see text] [Formula: see text] K[Formula: see text] during the total heating cycle, and the water temperature rises from 20∘C to 50.73∘C. In addition, the impact of water temperature on the evaporating region was used in this analysis. Therefore, the temperature of the evaporator is unaffected by the development of hot water. As a result, these outcomes will be used for the development of the domestic refrigerator with immersed condenser coil.","PeriodicalId":13757,"journal":{"name":"International Journal of Air-conditioning and Refrigeration","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2021-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88304225","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

Experimental Study of Indoor Air Quality for Cooling Condition Using ARDUINO System and PMV Index Testing the Effect of Heat Sources 基于ARDUINO系统的制冷条件下室内空气质量实验研究及PMV指数对热源影响的测试

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International Journal of Air-conditioning and Refrigeration Pub Date : 2021-06-23 DOI: 10.1142/S2010132521500218

Sondes Ifa, Z. Driss

引用次数: 2

Charge Optimization in Window Air Conditioner with Commercial LPG (Hydrocarbon Blend) 商用液化石油气(混合烃)窗式空调充能优化

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International Journal of Air-conditioning and Refrigeration Pub Date : 2021-06-10 DOI: 10.1142/S2010132521500206

S. Gupta, S. Pendyala

引用次数: 1

Chilled Coil Control and Field Performance for Turbine Inlet Air Chilling 涡轮进气冷却的冷冻盘管控制和现场性能

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International Journal of Air-conditioning and Refrigeration Pub Date : 2021-06-04 DOI: 10.1142/S201013252150019X

G. Anand, E. Makar

引用次数: 0

A Comprehensive Energetic and Exergetic Analysis of an Ejector Expansion Refrigeration Cycle Using R22 and R410A R22和R410A喷射器膨胀制冷循环的能量和火用综合分析

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International Journal of Air-conditioning and Refrigeration Pub Date : 2021-05-04 DOI: 10.1142/S2010132521500139

K. Al‐Chlaihawi, K. Al‐Farhany

引用次数: 4

Environmental Issues Related to Refrigeration Technologies 与制冷技术相关的环境问题

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International Journal of Air-conditioning and Refrigeration Pub Date : 2021-05-04 DOI: 10.1142/S2010132521300020

D. Coulomb

引用次数: 0

A Computational Study on Inter-Phase Heat Transfer in a Conical Fluidized Bed Reactor Using Hot Air 锥形流化床热空气传热的计算研究

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International Journal of Air-conditioning and Refrigeration Pub Date : 2021-04-27 DOI: 10.1142/S2010132521500188

Mohamed Y. Hashim, H. Sim, I. Im

引用次数: 0

Investigations on Predictions and Characteristics of Flow Field in the Pipelines of Chillers for Measured Locations of Ultrasonic Flowmeters by CFD Approach 基于CFD方法的超声流量计测点冷水机组管路流场预测及特性研究

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International Journal of Air-conditioning and Refrigeration Pub Date : 2021-04-07 DOI: 10.1142/S2010132521500140

Min Chai, Yu-Hsuan Chang, Chih-Hung Lin, Jin-Cyuan Tsai, Jhen-You Chin, R. N. Inten

{"title":"Investigations on Predictions and Characteristics of Flow Field in the Pipelines of Chillers for Measured Locations of Ultrasonic Flowmeters by CFD Approach","authors":"Min Chai, Yu-Hsuan Chang, Chih-Hung Lin, Jin-Cyuan Tsai, Jhen-You Chin, R. N. Inten","doi":"10.1142/S2010132521500140","DOIUrl":"https://doi.org/10.1142/S2010132521500140","url":null,"abstract":"The flow velocity profiles in most of the central air-conditioning pipelines are, in general, not fully developed flow and difficult to obtain the accurate flow rates by flowmeters, which are used for measuring average velocity. Especially for being at the outlet of an elbow, the accuracy of flow rate by measurement is quite low. Therefore, there are some limitations for measurements of flow rate and velocity profile by the present flow measuring technologies. The objective of this study was to establish an approach on accurate predictions of velocity profiles at different measured locations of central air-conditioning pipelines for nonuniform flow measurements by simulations of computational Fluid Dynamics (CFD). All the velocity profiles will integrate as a database for predictions by neural network algorithm for smart measurement further. In the present work initially, international experiments were employed to validate the accuracy of CFD approach. The calculations were carried out by different turbulence models. The results compared with the experimental data by Realizable [Formula: see text]-[Formula: see text] turbulence model with less computing resources have great agreements. Realizable [Formula: see text]-[Formula: see text] turbulence model was, therefore, determined for the predictions of central air-conditioning pipeline. According to various pipings and pipe sizes, the results for three cases show that the velocity profiles in the pipelines would not be symmetrical and has strong secondary flow. Therefore, all of the flow profiles would be integrated and analyzed as a database and assist to get accurately the measured locations of ultrasonic flowmeters. Further, this database will be combined with algorithm of artificial neural network for smart predictions.","PeriodicalId":13757,"journal":{"name":"International Journal of Air-conditioning and Refrigeration","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2021-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82486208","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

Chilled Coil Performance Control and Application to Turbine Inlet Air Cooling 冷冻盘管性能控制及其在汽轮机进气冷却中的应用

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International Journal of Air-conditioning and Refrigeration Pub Date : 2021-03-31 DOI: 10.1142/S2010132521500164

G. Anand, E. Makar

{"title":"Chilled Coil Performance Control and Application to Turbine Inlet Air Cooling","authors":"G. Anand, E. Makar","doi":"10.1142/S2010132521500164","DOIUrl":"https://doi.org/10.1142/S2010132521500164","url":null,"abstract":"The Absorption Refrigeration Cycle Turbine Inlet Conditioning (ARCTIC) system can chill the inlet air of the turbine to maintain optimum turbine performance at all ambient temperatures. However, turbine characteristics and bell-mouth icing concerns impose a minimum temperature limitation on the chilled air. Performance guarantees may also require maintaining the inlet air temperature within a narrow range throughout the year. These considerations require accurate prediction of the chilling coil performance over a wide range of operating conditions and the development of a robust controls strategy. A modified wet-surface model is used to model the chilling coil performance. The application of the model to a 2110[Formula: see text]kW (600 RT) ARCTIC providing inlet air chilling for a MARS 100 turbine is considered. A control strategy is developed to maintain the inlet air temperature at the desired set point with varying ambient temperatures and chilling loads. The TIAC controls help maintain the inlet air temperature at 7.22∘C to maximize turbine capacity and efficiency during most of the hot/warm days and accommodates 100% turndown. Additional safety measures are incorporated to prevent bell-mouth icing.","PeriodicalId":13757,"journal":{"name":"International Journal of Air-conditioning and Refrigeration","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2021-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87643235","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

Exergy Analysis of Humidification–Dehumidification Water Desalination Unit Working under Baghdad Conditions 巴格达工况下加除湿海水淡化机组的火用分析

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International Journal of Air-conditioning and Refrigeration Pub Date : 2021-03-31 DOI: 10.1142/S2010132521500176

M. Hassan, A. N. Khalifa, A. Hamed

{"title":"Exergy Analysis of Humidification–Dehumidification Water Desalination Unit Working under Baghdad Conditions","authors":"M. Hassan, A. N. Khalifa, A. Hamed","doi":"10.1142/S2010132521500176","DOIUrl":"https://doi.org/10.1142/S2010132521500176","url":null,"abstract":"Water desalination unit powered by renewable energy sources is sometimes needed at places far from the energy grid lines. Consequently, even countries with rich energy resources, such as the Arabian Gulf countries, have shown strong interest in desalination processes that often use renewable energy sources. This work aims to conduct an exergy analysis of solar-powered humidification–dehumidification (HDH) unit. The exergy analysis input data are extracted from a previous work conducted in August 2020 under Baghdad conditions, 33.3∘N latitude and 44.14∘E longitude. The previous work’s HDH unit consisted of six parabolic trough solar collectors (PTSCs), with a total aperture area of 8.76[Formula: see text]m2. Meteonorm v7.3 software was used to obtain the weather data for Baghdad City, Iraq. The HDH unit results had revealed low exergy efficiency, where the maximum overall exergy efficiency was 0.305% at 12.00[Formula: see text]noon, August 17, 2020, when the salty water flow rate was 1 L/min. The unit’s overall exergy efficiencies were 0.09%, 0.16%, 0.31%, and 0.085% when the salty water flow rates were 0.8, 0.9, 1, and 1.2 L/min, respectively. Maximum exergy destructions for the HDH unit components were 0.513, 0.156, 0.332, and 0.304[Formula: see text]kW for solar radiation, dehumidifier, humidifier, and PTSC, for a salty water flow rate of 1[Formula: see text]L/min. In contrast, the overall exergy destruction of the HDH unit was 1.3[Formula: see text]kW.","PeriodicalId":13757,"journal":{"name":"International Journal of Air-conditioning and Refrigeration","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2021-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85754320","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