International Journal of Refrigeration-revue Internationale Du Froid最新文献_第2页

Data-enhanced convolutional network based on air conditioning system start/stop time prediction 基于空调系统启动/停止时间预测的数据增强卷积网络

IF 3.5 2区工程技术

International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2024-11-12 DOI: 10.1016/j.ijrefrig.2024.11.006

Huaqiu Wang, Jiahao Tan

{"title":"Data-enhanced convolutional network based on air conditioning system start/stop time prediction","authors":"Huaqiu Wang, Jiahao Tan","doi":"10.1016/j.ijrefrig.2024.11.006","DOIUrl":"10.1016/j.ijrefrig.2024.11.006","url":null,"abstract":"<div><div>Most enterprise workshop operators frequently adjust the start/stop time of air conditioning systems based on indoor and outdoor temperatures and humidity to accommodate changing demand and weather conditions. However, relying on personal subjective experience for these adjustments often leads to operational delays or energy waste due to the lack of precision in determining optimal timing. Predicting air conditioning system start and stop times is crucial for energy consumption and savings in HVAC systems. Traditional data-driven methods have been insufficient in this regard, as they mainly focus on feature mapping and overlook the dynamic coupling relationships of process variables, resulting in subpar predictions. In response to this challenge, the paper introduces a novel approach known as the Periodicity and Long-Term Convolutional Neural Network (PLCNN). This method converts one-dimensional regression prediction data into two-dimensional data containing time series features to capture the dynamic coupling characteristics of the air conditioning system while maintaining the independent variation relationships of features. Experimental results using real factory floor data have demonstrated the superior performance of the PLCNN method. Specifically, this method achieved a 14.96% lower error rate compared to the traditional method and an 8.18% improvement compared to the deep learning method. Moreover, the implementation of the PLCNN method in the optimal control of air conditioning systems led to a significant 19.43% reduction in total monthly energy consumption. In conclusion, the proposed method offers a promising alternative to traditional approaches to forecasting and provides a solution to the common challenges encountered in traditional prediction tasks.</div></div>","PeriodicalId":14274,"journal":{"name":"International Journal of Refrigeration-revue Internationale Du Froid","volume":"169 ","pages":"Pages 372-382"},"PeriodicalIF":3.5,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142662870","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Start-up investigation and heat transfer enhancement analysis of a loop thermosyphon with biomimetic honeycomb-channel evaporator 带有仿生物蜂窝通道蒸发器的环形热流器的启动调查和传热增强分析

IF 3.5 2区工程技术

International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2024-11-12 DOI: 10.1016/j.ijrefrig.2024.11.016

Hainan Zhang , Jing Ding , Haichao Liu , Tao Ding , Yanhui Feng

{"title":"Start-up investigation and heat transfer enhancement analysis of a loop thermosyphon with biomimetic honeycomb-channel evaporator","authors":"Hainan Zhang , Jing Ding , Haichao Liu , Tao Ding , Yanhui Feng","doi":"10.1016/j.ijrefrig.2024.11.016","DOIUrl":"10.1016/j.ijrefrig.2024.11.016","url":null,"abstract":"<div><div>Loop thermosyphon has the ability of heat transfer without external energy input, which has good application potential in many areas. Biomimetic flow channel is an effective way for heat transfer enhancement and resistance optimization, therefore it is a promising method to improve the performance of loop thermosyphon. While currently few studies have been conducted in this field. In this paper, the start-up stages, flow patterns and heat transfer performance of a loop thermosyphon with biomimetic honeycomb-channel evaporator are experimentally investigated, and compared with a loop thermosyphon with parallel-flow evaporator. The results show that the start-up of can be divided into three stages: stage dominated by heat conduction, stage dominated by boiling and stage transited to stable operation; For the steady-state performance, the heating power of the optimal point with the lowest thermal resistance increases from 90 W to 150 W with the increase of the filling ratio from 50 % to 70 %; Compared to loop thermosyphon with parallel-flow evaporator, loop thermosyphon with biomimetic honeycomb evaporator has lower thermal resistance. The decline of thermal resistance is 4.1 %–21.6 %, and is more significant under small heating power. This paper provides a simple and affordable method for heat transfer improvement of loop thermosyphon.</div></div>","PeriodicalId":14274,"journal":{"name":"International Journal of Refrigeration-revue Internationale Du Froid","volume":"169 ","pages":"Pages 383-390"},"PeriodicalIF":3.5,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142662871","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Thermodynamic and technoeconomic limitations of Brayton refrigeration for air conditioning 用于空调的布雷顿制冷的热力学和技术经济局限性

IF 3.5 2区工程技术

International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2024-11-10 DOI: 10.1016/j.ijrefrig.2024.11.013

Jordan D. Kocher

{"title":"Thermodynamic and technoeconomic limitations of Brayton refrigeration for air conditioning","authors":"Jordan D. Kocher","doi":"10.1016/j.ijrefrig.2024.11.013","DOIUrl":"10.1016/j.ijrefrig.2024.11.013","url":null,"abstract":"<div><div>With global cooling demand increasing, there is a need for refrigeration cycles that use low global warming potential (GWP) refrigerants. Researchers have flirted with the idea of using the Brayton cycle for refrigeration over the years, but it has yet to prove competitive in performance or cost when compared to the widely used vapor compression cycle. The recent development of an electrochemical Brayton refrigeration cycle has renewed interest in the thermodynamics of Brayton refrigeration. This work provides a parametric study of the COP of a Brayton cycle air conditioner (either mechanical or electrochemical in nature) as a function of the characteristics of the cycle components (thermal conductances and isentropic efficiencies). When the isentropic efficiencies of the adiabatic components (i.e., the compressor and turbine in the mechanical Brayton cycle) are 90 %, the cycle COP is limited to a value of ∼1. Furthermore, a thermodynamic comparison to the vapor compression cycle reveals that the Brayton refrigeration cycle generates ∼8 × more entropy, and that the thermodynamic favorability of the vapor compression cycle is due to the presence of phase change.</div></div>","PeriodicalId":14274,"journal":{"name":"International Journal of Refrigeration-revue Internationale Du Froid","volume":"169 ","pages":"Pages 418-428"},"PeriodicalIF":3.5,"publicationDate":"2024-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142706614","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Thermal performance analysis of a domestic-size absorption cooling system incorporating nanofluid with thermal insulation in hot climate of Algeria

IF 3.5 2区工程技术

International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2024-11-10 DOI: 10.1016/j.ijrefrig.2024.11.009

Afak Benazzouz , Mohammed Ali Hadj Ammar , Belkhir Settou , Yacine Marif , Kheira Djemoui

{"title":"Thermal performance analysis of a domestic-size absorption cooling system incorporating nanofluid with thermal insulation in hot climate of Algeria","authors":"Afak Benazzouz , Mohammed Ali Hadj Ammar , Belkhir Settou , Yacine Marif , Kheira Djemoui","doi":"10.1016/j.ijrefrig.2024.11.009","DOIUrl":"10.1016/j.ijrefrig.2024.11.009","url":null,"abstract":"<div><div>The increased demand for energy consumption for air conditioning, due to rising temperatures, has created challenges related to thermal comfort in residential environments .In the present study, a simulation of an air conditioning system for a small building was conducted, considering various absorption cooling scenarios to assess system performance through dynamic and economic analysis. The proposed system employs a parabolic trough collector in conjunction with a storage tank, designed to cool a 12 m² room in Adrar, Algeria. The study aims to identify the optimal scenario based on temperature, heat, and system coefficient of performance indicators. A computer program was developed using characteristic equations and finite difference methods to analyze the system's behavior with different nanofluid concentrations and thermal insulation. Simulation results show that scenario with nanofluid and insulation the best performance is achieved with a 4% nanofluid concentration, a 9 m² solar collector, a 0.3 m³ storage tank, and 0.05 m thick polystyrene insulation. The system can operate for 9 h, maintaining an indoor temperature of 27°C with a peak cooling load of 3 kW. The economic analysis estimates an investment cost of 4535.4$ and Net Present Value 3,370.40$ with a payback period of 12 years and 3 months.</div></div>","PeriodicalId":14274,"journal":{"name":"International Journal of Refrigeration-revue Internationale Du Froid","volume":"170 ","pages":"Pages 192-213"},"PeriodicalIF":3.5,"publicationDate":"2024-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142756748","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influence of geometric parameters on ejector acoustics and efficiency in ejector refrigeration system 几何参数对喷射器声学和喷射器制冷系统效率的影响

IF 3.5 2区工程技术

International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2024-11-09 DOI: 10.1016/j.ijrefrig.2024.11.011

Wenliang Li , Qingyang Han , Cheng Wang , Hailun Zhang , Lei Jia , Lei Wang , Wenxu Sun , Haoyuan Xue

{"title":"Influence of geometric parameters on ejector acoustics and efficiency in ejector refrigeration system","authors":"Wenliang Li , Qingyang Han , Cheng Wang , Hailun Zhang , Lei Jia , Lei Wang , Wenxu Sun , Haoyuan Xue","doi":"10.1016/j.ijrefrig.2024.11.011","DOIUrl":"10.1016/j.ijrefrig.2024.11.011","url":null,"abstract":"<div><div>Ejectors are extensively utilized in Ejector Refrigeration System (ERS), serving as essential elements for process propulsion and vapor recirculation. However, their operation produces substantial aerodynamic noise, which adversely affects the surrounding environment and human health. Consequently, an investigation was conducted into the correlation between aerodynamic noise and the ejector's performance, based on the geometric configuration of the ejector. Additionally, the flow field of the ejector was analyzed. Nine types of ejectors with different area ratios (AR) and nozzle exit positions (NXP) were established, and the simulation results showed that the aerodynamic noise was positively correlated with the turbulence intensity. The higher the turbulence intensity, the higher the sound power level of the noise. As the AR increased from 5.8 to 11.4, turbulence intensity gradually decreased. An increase in AR by 1.4 resulted in a reduction of aerodynamic noise by 2–3 dB, while the entrainment ratio (ER) initially increased and then decreased. With an increase in the primary flow pressure, the optimal AR moves backward. The change in NXP has a negligible effect on turbulence intensity and ejector noise but significantly impacts ER. Overall, 9 different AR and NXP ejectors were 3D-printed and tested. The far-field noise data of the experimental ejector exhibited the same trend as the simulated noise data, which verified the simulation results. The ejector's optimal structure was discussed based on its ability to maintain relatively higher ER and lower noise levels amid pressure fluctuations.</div></div>","PeriodicalId":14274,"journal":{"name":"International Journal of Refrigeration-revue Internationale Du Froid","volume":"169 ","pages":"Pages 429-443"},"PeriodicalIF":3.5,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142706615","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Comparative thermodynamic study of CO2 transcritical supermarket booster refrigeration system combined with vapor injection and parallel compression 结合喷气和并联压缩的二氧化碳跨临界超市增压制冷系统的热力学比较研究

IF 3.5 2区工程技术

International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2024-11-09 DOI: 10.1016/j.ijrefrig.2024.11.007

Jiawei Jiang, Qichao Yang, Tailan Yin, Zeye Zheng, Yuanyang Zhao, Guangbin Liu, Liansheng Li

{"title":"Comparative thermodynamic study of CO2 transcritical supermarket booster refrigeration system combined with vapor injection and parallel compression","authors":"Jiawei Jiang, Qichao Yang, Tailan Yin, Zeye Zheng, Yuanyang Zhao, Guangbin Liu, Liansheng Li","doi":"10.1016/j.ijrefrig.2024.11.007","DOIUrl":"10.1016/j.ijrefrig.2024.11.007","url":null,"abstract":"<div><div>The use of CO<sub>2</sub> refrigerants in supermarket refrigeration has recently demonstrated great potential owing to their excellent thermophysical properties and environmental protection. To further improve the efficiency of transcritical CO<sub>2</sub> refrigeration systems, a parallel compression cycle with vapor injection system (SRC) is proposed. Thermodynamic model is established to investigate the influence of working condition parameters and compared with basic booster refrigeration system (BRC) and parallel compression refrigeration system (PRC). In addition, the effect of vapor injection parameters on the characteristics of the proposed system is investigated. The results show that the medium pressure has little effect on BRC, while the optimum value exists for both PRC and SRC. The performance of the three systems can be significantly enhanced by optimizing the discharge pressure and medium pressure. The optimal value of the relative vapor injection pressure is constant at about 1.15. The maximum coefficient of performance (COP<sub>max</sub>) of the SRC is significantly improved by 23.99%∼32.14% and 14.44%∼20.07% at disccussed working conditions compared with BRC and PRC, respectively. In summary, this paper confirms the performance enhancement potential of the proposed cycle and provides theoretical support for its practical implementation.</div></div>","PeriodicalId":14274,"journal":{"name":"International Journal of Refrigeration-revue Internationale Du Froid","volume":"170 ","pages":"Pages 70-84"},"PeriodicalIF":3.5,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142723425","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study on off-grid performance and economic viability of photovoltaic energy storage refrigeration systems 光伏储能制冷系统的离网性能和经济可行性研究

IF 3.5 2区工程技术

International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2024-11-09 DOI: 10.1016/j.ijrefrig.2024.11.012

Yali Guo 郭亚丽 , Tao Zhang 张涛 , Huadong Zhou , Shengqiang Shen 沈胜强 , Minle Bao 鲍民乐 , Hongyu Bao 鲍宏宇 , Liang Wang 王亮 , Shaoguan Sun 孙绍官 , Fei Li 李飞 , Hongbao Wang 王洪宝

{"title":"Study on off-grid performance and economic viability of photovoltaic energy storage refrigeration systems","authors":"Yali Guo 郭亚丽 , Tao Zhang 张涛 , Huadong Zhou , Shengqiang Shen 沈胜强 , Minle Bao 鲍民乐 , Hongyu Bao 鲍宏宇 , Liang Wang 王亮 , Shaoguan Sun 孙绍官 , Fei Li 李飞 , Hongbao Wang 王洪宝","doi":"10.1016/j.ijrefrig.2024.11.012","DOIUrl":"10.1016/j.ijrefrig.2024.11.012","url":null,"abstract":"<div><div>With the rapid advancement of photovoltaic and energy storage technologies, photovoltaic energy storage refrigerator systems have gained significant attention as an innovative energy solution. This paper designs and constructs an off-grid photovoltaic power generation energy storage refrigerator system, and evaluates its economic viability in practical environments. By measuring indoor temperature, refrigerator internal temperature, irradiance, and daily power generation, the paper analyzes system operating parameters such as refrigerator cooling rate and power supply mode, and studies the system's refrigeration performance, off-grid operation capability, and factors affecting daily power generation. Utilizing economic indicators such as benefit-cost ratio, levelized cost of electricity, investment dynamic payback process, net present value, and internal rate of return, the economic viability of the system is assessed. Results indicate that the system meets refrigeration performance requirements, maintaining a uniform temperature distribution and extended off-grid operation capability. Daily power generation is influenced by weather conditions, seasons, and all electrical loads in the system. In the Dalian region of China, the system demonstrates good economic viability, enabling investment recovery and profitability in a relatively short period. This system has broad market prospects in areas with abundant solar resources or high demand for refrigerator usage.</div></div>","PeriodicalId":14274,"journal":{"name":"International Journal of Refrigeration-revue Internationale Du Froid","volume":"169 ","pages":"Pages 391-404"},"PeriodicalIF":3.5,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142662872","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Thermodynamic and economic analysis of a novel solar-assisted vapor injection ejector-enhanced cycle for building heating 用于建筑供暖的新型太阳能辅助蒸汽喷射器强化循环的热力学和经济分析

IF 3.5 2区工程技术

International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2024-11-08 DOI: 10.1016/j.ijrefrig.2024.11.005

Youcai Liang, Zhengyong Li, Yan Zhu, Meirong Dong, Jidong Lu

{"title":"Thermodynamic and economic analysis of a novel solar-assisted vapor injection ejector-enhanced cycle for building heating","authors":"Youcai Liang, Zhengyong Li, Yan Zhu, Meirong Dong, Jidong Lu","doi":"10.1016/j.ijrefrig.2024.11.005","DOIUrl":"10.1016/j.ijrefrig.2024.11.005","url":null,"abstract":"<div><div>This research proposes a novel solar-assisted vapor injection ejector-enhanced cycle (SVI-EEC). The energy, exergy, and exergo-economic modelings of SVI-EEC are conducted in this study and compared with the modified solar-assisted vapor injection ejector-enhanced cycle (SE-MVIC) and the flash tank vapor injection cycle (FVIC). In addition, the performance of several low-GWP refrigerant mixtures (R13I1/R152a,R13I1/R161 and R13I1/R32), is investigated to advance the replacement of HFC refrigerants.The simulation results show that for the same compressor inlet mass flow, the <span><math><mrow><mi>C</mi><mi>O</mi><msub><mi>P</mi><mi>h</mi></msub></mrow></math></span> of SVI-EEC is improved by 6.9% and 29.7% compared to SE-MVIC and FVIC, respectively. The <span><math><mrow><mi>C</mi><mi>O</mi><msub><mi>P</mi><mi>h</mi></msub></mrow></math></span> and <span><math><msub><mi>Q</mi><mrow><mi>c</mi><mi>o</mi><mi>n</mi></mrow></msub></math></span> of R13I1/R152a at optimum injection pressure increased by 1.94% and 5.49%, respectively, compared to R134a. In summary, the proposed SVI-EEC system has excellence in performance and application potential, while R13I1/R152a has the potential to replace R134a.</div></div>","PeriodicalId":14274,"journal":{"name":"International Journal of Refrigeration-revue Internationale Du Froid","volume":"169 ","pages":"Pages 346-361"},"PeriodicalIF":3.5,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142662868","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental study on the performance of a novel data center air conditioner combining air cooling and evaporative cooling

IF 3.5 2区工程技术

International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2024-11-07 DOI: 10.1016/j.ijrefrig.2024.11.010

Yaxi Zhang , Haixiao Han , Yanqiu Zhang , Jun Li , Yao zheng , Changxiong Liu , Yubo Liu , Diance Gao

{"title":"Experimental study on the performance of a novel data center air conditioner combining air cooling and evaporative cooling","authors":"Yaxi Zhang , Haixiao Han , Yanqiu Zhang , Jun Li , Yao zheng , Changxiong Liu , Yubo Liu , Diance Gao","doi":"10.1016/j.ijrefrig.2024.11.010","DOIUrl":"10.1016/j.ijrefrig.2024.11.010","url":null,"abstract":"<div><div>Addressing challenges of high-temperature shutdowns, low energy efficiency, and limited natural cooling utilization in data center air conditioning, a novel hybrid air cooling and evaporative cooling air-conditioning(ACEC-AC) system has been developed. The system is well-suited for application in data centers located in regions with high outdoor temperatures and large dry-bulb to wet-bulb temperature differences during summer. Experimental evaluations in an enthalpy difference laboratory revealed that the hybrid system's performance in wet mode (combining air cooling and evaporative cooling) significantly outperforms its dry mode (solely air cooling) and traditional cooling units. At an outdoor temperature of 35.60 °C dry-bulb and 29.95 °C wet-bulb, the system achieved a COP of 3.85, a 21.45 % improvement over dry mode and 16.16 % higher than conventional Packaged computer room air conditioning (CRAC). Notably, the system maximizes its benefits in regions like Guangzhou, where the temperature difference between the dry bulb and wet bulb is significant, resulting in an annual operational cost savings of over 34.16 %. In conclusion, the hybrid air cooling and evaporative cooling system represents an effective energy-saving technology with great potential to enhance data center performance and reduce energy consumption.</div></div>","PeriodicalId":14274,"journal":{"name":"International Journal of Refrigeration-revue Internationale Du Froid","volume":"170 ","pages":"Pages 98-112"},"PeriodicalIF":3.5,"publicationDate":"2024-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745531","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Comparative investigation on water fouling characteristics in 5 mm and 7 mm tubes with smooth type and screwed type 平滑式和螺纹式 5 毫米和 7 毫米管中水垢特性的比较研究

IF 3.5 2区工程技术

International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2024-11-06 DOI: 10.1016/j.ijrefrig.2024.11.003

Feilong Zhan , Wenyi Zhou , Ziteng Yan , Guoliang Ding , Bao Yue , Feng Li , Ning Li , Yanpo Shao , Chao Ma , Huan Zhang

{"title":"Comparative investigation on water fouling characteristics in 5 mm and 7 mm tubes with smooth type and screwed type","authors":"Feilong Zhan , Wenyi Zhou , Ziteng Yan , Guoliang Ding , Bao Yue , Feng Li , Ning Li , Yanpo Shao , Chao Ma , Huan Zhang","doi":"10.1016/j.ijrefrig.2024.11.003","DOIUrl":"10.1016/j.ijrefrig.2024.11.003","url":null,"abstract":"<div><div>Application of copper tubes with the diameter of 5 mm instead of 7 mm in chillers of central air conditioning systems is the development tendency due to the requirement of copper material saving. However, the heat transfer deterioration by water fouling precipitated in 5 mm tubes may be more serious than that in 7 mm tubes. The purpose of this paper is to comparatively investigate the water fouling characteristics on both 5 mm and 7 mm tubes. An accelerated experimental method of water fouling process was designed to quickly evaluate the fouling degree. Four tube types are tested, i.e. a 7 mm smooth tube, a 7 mm screwed tube, a 5 mm smooth tube and a 5 mm screwed tube, and these tubes are fabricated as flexible coiled tubes with total length of 200 cm. The results show that the water fouling process experiences the initiation, growth and stabilization stages in sequence, and the crystal form of fouling is in the vaterite, aragonite and schistosity patterns respectively. The fouling masses in 5 mm smooth tube and 5 mm screwed tube are respectively 42.1% and 16.9% larger than those in 7 mm smooth tube and 7 mm screwed tube, meaning that 5 mm tubes are more prone to form water fouling compared with 7 mm tubes; while the averaged fouling mass in screwed tubes is 2.8% lower than that in smooth tubes since screwed tubes are benefit to destroy the integrality of fouling layer and enhance the removal of deposited particulates.</div></div>","PeriodicalId":14274,"journal":{"name":"International Journal of Refrigeration-revue Internationale Du Froid","volume":"169 ","pages":"Pages 334-345"},"PeriodicalIF":3.5,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142662867","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0