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Advanced Cooling Technologies and Applications最新文献

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Nucleate Pool Boiling Heat Transfer of Refrigerants Using Coated Surfaces 包覆表面下制冷剂的核池沸腾传热
Advanced Cooling Technologies and Applications Pub Date : 2019-01-30 DOI: 10.5772/INTECHOPEN.81864
A. Dewangan, Anil Kumar, Ravi Kumar
{"title":"Nucleate Pool Boiling Heat Transfer of Refrigerants Using Coated Surfaces","authors":"A. Dewangan, Anil Kumar, Ravi Kumar","doi":"10.5772/INTECHOPEN.81864","DOIUrl":"https://doi.org/10.5772/INTECHOPEN.81864","url":null,"abstract":"This work presents the experimental study of nucleated pool boiling heat transfer of R-134a and R-410A on a horizontal coated heating surface. The heating surface dimen-sions are 25.4 mm outer diameter and 116 mm effective length. The coated surfaces were fabricated by flame spraying technique. The copper powder was used as a coating mate rial applied to the outer surface of copper tube. The experiments were performed for heat flux range of 5–50 kWm − 2 at saturation temperature of 10°C. The heat transfer coefficients of both refrigerants demonstrated the same trends with applied heat flux increase and their magnitudes increases with increasing the value of applied heat flux. The present study also includes the effects of heat flux and coating parameter on boiling character - istics. The boiling heat transfer coefficient is enhanced by 1.9 times that of plain surface. An empirical correlation was also developed to predict the heat transfer coefficient with a mean error of 13%.","PeriodicalId":386786,"journal":{"name":"Advanced Cooling Technologies and Applications","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114645852","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
Introductory Chapter: A Brief Note on Advanced Cooling Technologies 导论章:先进冷却技术简介
Advanced Cooling Technologies and Applications Pub Date : 2018-11-13 DOI: 10.5772/INTECHOPEN.82340
S. Murshed
{"title":"Introductory Chapter: A Brief Note on Advanced Cooling Technologies","authors":"S. Murshed","doi":"10.5772/INTECHOPEN.82340","DOIUrl":"https://doi.org/10.5772/INTECHOPEN.82340","url":null,"abstract":"The smaller and faster based modern trend of manufacturing devices and equipment leads to dramatic increase in heat generation resulting in their higher failure rate and shorter longevity. For instance, the reduction of size of high-tech electronic devices and huge increase in the number of integrated components and subsequent increase in power density yielded enormous challenges for their fast and adequate cooling [1]. Since conventional cooling techniques are falling short in dealing with such high cooling demand, advanced and innovative cooling technologies are needed to meet the raising cooling demand of those modern devices, systems, and processes. In recent years, research and development in advanced cooling technologies as well as search for superior coolants have attracted tremendous interest worldwide and good progress has been made as numbers of new cooling systems as well as few new coolants have emerged [2, 3]. Recently, a feature on cooling technologies was published in technology report of BBC News where cooling technologies were also identified to be a red-hot sector [4]. While there is an urgent need to reduce (cool down) the global warming, the increasing cooling needs from modern devices, systems, and appliances as well as human comfort (like district heating and cooling) to be met with the advanced cooling technologies and coolants.","PeriodicalId":386786,"journal":{"name":"Advanced Cooling Technologies and Applications","volume":"253 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134336976","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
Energy Efficient Indirect Evaporative Air Cooling 节能间接蒸发空气冷却
Advanced Cooling Technologies and Applications Pub Date : 2018-11-05 DOI: 10.5772/INTECHOPEN.79223
X. Cui, Xiaohu Yang, Yanjun Sun, X. Meng, Liwen Jin
{"title":"Energy Efficient Indirect Evaporative Air Cooling","authors":"X. Cui, Xiaohu Yang, Yanjun Sun, X. Meng, Liwen Jin","doi":"10.5772/INTECHOPEN.79223","DOIUrl":"https://doi.org/10.5772/INTECHOPEN.79223","url":null,"abstract":"An energy-saving and environmentally friendly air-conditioning method has been pro- posed. The key component is a novel indirect evaporative heat exchanger (IEHX) based on the M-cycle. In this design, the compact IEHX is able to produce sub-wet-bulb cooling and reduce the air temperature approaching dew-point temperature. This chapter aims to achieve a fundamental understanding of the novel IEHX. A numerical model has been developed and validated by comparing the simulated outlet air conditions against experimental data. The model showed a good agreement with the experimental findings. Employing the validated numerical model, we have theoretically investigated the heat and mass transfer behavior occurred in the IEHX. The detailed cooling process has been analyzed on the psychrometric chart. In addition, the effects of varying inlet conditions and airflow passage dimensions on the cooling efficiency have been studied. By analyzing the thermal performance of the IEHX, we have provided possible suggestions to improve the performance of the dew-point cooler and enable it to attain higher cooling effectiveness.","PeriodicalId":386786,"journal":{"name":"Advanced Cooling Technologies and Applications","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125011455","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
The Fundamental and Application of Transient Flashing Spray Cooling in Laser Dermatology 瞬态闪光喷雾冷却技术的基础及在激光皮肤病中的应用
Advanced Cooling Technologies and Applications Pub Date : 2018-11-05 DOI: 10.5772/INTECHOPEN.79462
Zhi-fu Zhou, Bin Chen
{"title":"The Fundamental and Application of Transient Flashing Spray Cooling in Laser Dermatology","authors":"Zhi-fu Zhou, Bin Chen","doi":"10.5772/INTECHOPEN.79462","DOIUrl":"https://doi.org/10.5772/INTECHOPEN.79462","url":null,"abstract":"Cryogen spray cooling (CSC) has been successfully implemented in laser dermatol- ogy such as the treatment of port wine stain. It can protect epidermis from irreversible thermal injuries and increase laser energy, leading to the improvement in therapeutic outcomes. Different from traditional steady spray cooling, CSC is highly transient with short spurt duration (several tens of milliseconds). Besides, CSC can achieve flashing atomization and fine droplets with simple structure nozzles by rapid release of super heat. In this chapter, the mechanism of CSC flashing spray, spray and thermal character - istics of droplets, the measurement method of transient temperature and algorithms for heat flux estimation, and the dynamic surface heat transfer and its relation with spray characteristics are fully discussed. Finally, the heat transfer enhancement of CSC is intro-duced including alternative cryogens, new nozzles, and hypobaric pressure method to increase the cooling ability, which is essential to improve therapeutic outcome, especially for darkly pigmented human skin.","PeriodicalId":386786,"journal":{"name":"Advanced Cooling Technologies and Applications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131135782","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
Water as a Refrigerant in Centrifugal Compressor Cooling Systems for Industrial Applications 水作为工业用离心式压缩机冷却系统中的制冷剂
Advanced Cooling Technologies and Applications Pub Date : 2018-11-05 DOI: 10.5772/INTECHOPEN.79614
Florian Hanslik, J. Suess
{"title":"Water as a Refrigerant in Centrifugal Compressor Cooling Systems for Industrial Applications","authors":"Florian Hanslik, J. Suess","doi":"10.5772/INTECHOPEN.79614","DOIUrl":"https://doi.org/10.5772/INTECHOPEN.79614","url":null,"abstract":"As a consequence of the F-gas regulation R404A is no longer a viable option for commercial refrigeration applications. Therefore, this paper focuses on natural refrigerants. There are a few alternatives like carbon dioxide, which has an efficiency loss with increasing environment temperatures. A promising option is the combination of a carbon dioxide process with a chiller using water as refrigerant. Two types of interconnection seem to make energy sense. On the one hand, the interconnection as a cascade, whereby the complete heat of condensation is given off to the water chiller, on the other hand the subcooling of transcritical CO2 after the gas cooler. Both types of interconnection result in optimized operating parameters for the CO2 process. These are examined more closely, and finally, the annual COP values are compared with the standard systems.","PeriodicalId":386786,"journal":{"name":"Advanced Cooling Technologies and Applications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129962869","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
Heat Pump-Based Novel Energy System for High-Power LED Lamp Cooling and Waste Heat Recovery 基于热泵的大功率LED灯冷却及余热回收新能源系统
Advanced Cooling Technologies and Applications Pub Date : 2018-11-05 DOI: 10.5772/INTECHOPEN.78322
Jiwen Cen, Zhibin Li, Yiwei Wang, F. Jiang, Shaoxiong Liao, Fuwen Liang
{"title":"Heat Pump-Based Novel Energy System for High-Power LED Lamp Cooling and Waste Heat Recovery","authors":"Jiwen Cen, Zhibin Li, Yiwei Wang, F. Jiang, Shaoxiong Liao, Fuwen Liang","doi":"10.5772/INTECHOPEN.78322","DOIUrl":"https://doi.org/10.5772/INTECHOPEN.78322","url":null,"abstract":"Unlike incandescent light bulb, which radiates heat into the surroundings by infrared rays, light emitting diode (LED) traps heat inside the lamp. This fact increases the diffi-culty of cooling LED lamps, while it facilitates the recovery of the generated heat. We propose a novel energy system that merges high-power LED lamp cooling with the heat pump use; the heat pump can cool the LED lamp and at the same time recover the waste heat. In this way, a high percentage of the energy consumed by the LED lamp can be utilized. In this work, we developed a prototype of this energy system and conducted a series of experimental studies to determine the effect of several parameters, such as cooling water flow rate and LED power, on the LED leadframe temperature, compressor power consumption, and system performance. The experimental results clearly indicate that the energy system can lead to substantial energy savings.","PeriodicalId":386786,"journal":{"name":"Advanced Cooling Technologies and Applications","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125344123","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
Development of Modular Cooling for Water-Cooled Photovoltaic Plant in Real Scale 实际规模水冷式光伏电站模块化冷却系统的开发
Advanced Cooling Technologies and Applications Pub Date : 2018-11-05 DOI: 10.5772/INTECHOPEN.79101
V. O. D. Silva, M. Udaeta, A. Gimenes, A. C. A. Junior, Angélica LuanaLinhares, Pascoal Rigolin
{"title":"Development of Modular Cooling for Water-Cooled Photovoltaic Plant in Real Scale","authors":"V. O. D. Silva, M. Udaeta, A. Gimenes, A. C. A. Junior, Angélica LuanaLinhares, Pascoal Rigolin","doi":"10.5772/INTECHOPEN.79101","DOIUrl":"https://doi.org/10.5772/INTECHOPEN.79101","url":null,"abstract":"This chapter evaluates module architectures and units of photovoltaic cooling systems, aiming to determine, select and design a modular system that can be applied in a real-scale photovoltaic power plant (PVPP) in order to enhance the yields of electricity pro- duction (entitled cooled photovoltaic plant). An analysis of the local climatic, geographic and solar conditions as well as construction, operational and maintenance aspects was carried out. Worldwide, there are three main types of cooled photovoltaic systems: PVT liquid and air collectors, PV ventilated with heat recovery and non-PVT systems. Based on the local weather conditions (tropical warm and dry) with both temperature and solar irradiation index being high, it results the PVT-liquid system to be more suitable in a scenario with available cooling fluid. We conclude that the best design and arrangement of the cooling system are of the type coil and multiple channel because they permit better rates of heat exchange between the cooling fluid and the PV module.","PeriodicalId":386786,"journal":{"name":"Advanced Cooling Technologies and Applications","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133213538","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
Spray Impingement Cooling: The State of the Art 喷雾冲击冷却:最新技术
Advanced Cooling Technologies and Applications Pub Date : 2018-11-05 DOI: 10.5772/INTECHOPEN.80256
Xuan Gao, Ri Li
{"title":"Spray Impingement Cooling: The State of the Art","authors":"Xuan Gao, Ri Li","doi":"10.5772/INTECHOPEN.80256","DOIUrl":"https://doi.org/10.5772/INTECHOPEN.80256","url":null,"abstract":"The cooling of a surface can be achieved by the impingement of spray, which is a free surface flow of droplets ejected from a spray nozzle. Spray cooling can provide uniform cooling and handle high heat fluxes in both single phase and two phases. In this chapter, spray cooling is reviewed from two aspects: the entire spray (spray level) and droplets (droplet level). The discussion on the spray level is focused on the spray cooling performance as a function of fluid properties, flow conditions, surface conditions, and nozzle positioning. The advantages and barriers of using spray cooling for engineering applications are summarized. The discussion on the droplet level is focused on the impact of droplet flow on film flow, which is the key flow mechanism in spray cooling. Droplet flow involves single droplet, droplet train (continuously droplets broke up from jet flow), and droplet burst (droplet groups affecting at a constant frequency), and local cooling enhancement due to droplet flow is discussed in details. Future work and unresolved issues in spray cooling are proposed.","PeriodicalId":386786,"journal":{"name":"Advanced Cooling Technologies and Applications","volume":"2015 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128046805","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: 19
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