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基于绿色磨削的冷气冷却实验研究 被引量:11
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作者 赵恒华 蔡光起 高航 《制造技术与机床》 CSCD 北大核心 2004年第4期54-55,共2页
进行了CO2 冷气磨削冷却的探索实验 ,根据实验数据绘制了外冷却、内冷却磨削温度曲线 ,并对内外冷却效果进行了分析和对比。实验表明 ,在冷气压力不大于 1MPa实验条件下 ,外冷却的效果优于内冷却。但随着冷气压力的增加 ,内冷却的优势... 进行了CO2 冷气磨削冷却的探索实验 ,根据实验数据绘制了外冷却、内冷却磨削温度曲线 ,并对内外冷却效果进行了分析和对比。实验表明 ,在冷气压力不大于 1MPa实验条件下 ,外冷却的效果优于内冷却。但随着冷气压力的增加 ,内冷却的优势逐渐明显。当冷气压力达到 1MPa时 ,内冷却效果略优于外冷却。 展开更多
关键词 绿色制造 冷气冷却 磨削温度 绿色磨削 实验研究
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塑料注塑模具中的冷却控制系统设置 被引量:4
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作者 王旭 文建洲 +1 位作者 朱传林 罗昆鹏 《河南科技》 2021年第8期59-61,共3页
本文阐述了塑料注塑模具冷却系统的重要性和必要性,介绍了冷却水路的应用形式及其特点,并说明了需要重点冷却的模具区域,对模具工件的冷却水路设计具有重要的指导意义。
关键词 冷却 冷却水用回路板 冷气冷却 3D打印随形冷却水路
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陶瓷基复合材料涡轮外环研制初探 被引量:1
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作者 彭秀云 叶飞 刘志远 《航空制造技术》 2015年第14期98-99,108,共3页
目前涡轮外环通常采用镍基和钴基高温合金材料并通冷气冷却,难以满足发动机安全可靠工作所必需的高温蠕变强度和高温抗氧化腐蚀能力,以及降低发动机结构重量提高功重比的需求,因此,开展陶瓷基涡轮外环的材料、工艺及应用研究是十分必要的。
关键词 陶瓷基复合材料 外环 涡轮 高温合金材料 发动机结构 高温抗氧化 冷气冷却 腐蚀能力
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强冷磨削的试验研究 被引量:1
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作者 盖全文 王继先 《化工机械》 CAS 2002年第6期320-322,共3页
进行了强冷磨削和干磨削试验。试验结果表明 ,磨削温度随工件速度和磨削深度的增大而增大 ,强冷磨削可显著降低磨削温度 ,在冷却压力小于 1MPa时 。
关键词 强冷磨削 试验 研究 CBN砂轮 磨削温度 冷气冷却
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Research and application of methods for effectiveness evaluation of mine cooling system 被引量:7
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作者 Guo Pingye Wang Yanwei +2 位作者 Duan Mengmeng Pang Dongyang Li Nan 《International Journal of Mining Science and Technology》 SCIE EI CSCD 2015年第4期649-654,共6页
Regarding the complexity and inconsistency of results in existing evaluation methods of mine cooling system, this paper clarifies the advantages, disadvantages and application of various mine cooling sys- tems through... Regarding the complexity and inconsistency of results in existing evaluation methods of mine cooling system, this paper clarifies the advantages, disadvantages and application of various mine cooling sys- tems through principle analysis, and divides all the cooling systems into air-cooling, ice-cooling and water-cooling according to the transportation of cold energy. On this basis, the paper proposes a simple and efficient evaluation method for mine cooling system. The first index of this method is the air temper- ature at point C which is 15 m away from the return wind corner at working face. A cooling system will be judged ineligible if the air temperature at point C is above 30 ℃ during operation, because in this case, the combustible gases in coal will sharply overflow, inducing gas incidents. Based on the preliminary judg- ment of the first index, another two evaluation indexes are proposed based on the cooling ability and dehumidification of an airflow volume of 1000 m3/min at point C to evaluate the investment and opera- tion cost of mine cooling system. This evaluation method has already been successfully applied in the cooling system design of Zhangshuanglou coal mine. 展开更多
关键词 Cooling system EFFECTIVENESS EVALUATION Index system
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Feasibility Analysis of Back-Pressure Steam Feeding Water Pump for Direct Air-Cooled Unit 被引量:1
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作者 Zhao Xiaodong Wang Meng +2 位作者 Du Xiaoze Yang Lijun Yang Yongping 《Electricity》 2013年第1期31-35,共5页
As the performance of an air-cooled condenser is apt to be affected by the fluctuating ambient condition, some difficulties are brought to the use of a steam feeding water pump in an air-cooled unit. This paper introd... As the performance of an air-cooled condenser is apt to be affected by the fluctuating ambient condition, some difficulties are brought to the use of a steam feeding water pump in an air-cooled unit. This paper introduces a new design of for steam feeding the water pump of an air-cooled unit using the back-pressure steam turbine as the prime motor. Using variable condition analysis on a 600 MW direct air-cooled unit, and with consideration of the effect on the ambient conditions, the feasibility, economy, and adaptability of the design are verified. 展开更多
关键词 air-cooled back-pressure steam turbine steam feed water pump variable condition
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Economical Evaluation of a Low-Enthalpy Geothermal Resource Located in an Arid-Zone Area 被引量:1
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作者 Salah Masheitil Brian Agnew +1 位作者 Sara Walker Mosbah Talbi 《Journal of Energy and Power Engineering》 2012年第7期1013-1021,共9页
In this work an economical evaluation that established the viability of a low enthalpy geothermal resource as an energy source in north Africa is presented. The factors considered included the payback period, average ... In this work an economical evaluation that established the viability of a low enthalpy geothermal resource as an energy source in north Africa is presented. The factors considered included the payback period, average rate of return, net present value, and net benefit-cost ratio. The model was based on utilising the energy source to energise four models that comprised thermal equipment consisting of water/air cooled single/half effect lithium bromide water mixture absorption chillers and an R-245fa organic Rankine cycle. These modelled cycles were based on the energy demand for Waddan city a community in southern Libya which has a demand for combined cooling/electricity only or cooling/electricity with district hot water supply. The results revealed that all of the proposed simulated stand-alone models, except the water-cooled half effect chiller, are not economically viable unless they are heavily subsidized or combined with the district hot water supply at least in the winter season. 展开更多
关键词 Libya low-temperature geothermal resources economical analysis IPSEpro organic Rankine cycle absorption chillers.
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Influence of Cooling Systems on the Behaviour of Dairy Cows Housed in Cubicle Barn
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作者 Matteo Barbari Lorenzo Leso Giuseppe Rossi Alberto Scaramelli Stefano Simonini 《Journal of Agricultural Science and Technology(A)》 2012年第1期40-49,共10页
The aim of this paper is to collect information about dairy cow's behaviour connected to different environmental conditions. During summer 2009 and winter 2010 experimental trials were arranged to verify the behaviou... The aim of this paper is to collect information about dairy cow's behaviour connected to different environmental conditions. During summer 2009 and winter 2010 experimental trials were arranged to verify the behaviour of dairy cows in a farm located in Po Plain (Italy). The barn was provided with an air-water cooling system, based on the use of fans and sprinklers placed only in the feeding alley. Two different trials were carried out. The first experiment was targeted on verifying the use of the cubicles by the cows in relation to the availability of the cooling system only in feeding area. The second trial aimed at testing the effectiveness of zone cooling systems placed in the front of cubicles. For this purpose three cubicles in the barn were provided with cooling systems, based on the input of high velocity conditioned air streams. The results clearly remark that the behaviour of the animals is greatly influenced by the environmental conditions. With high temperatures the use of the cubicles is deeply reduced and the animals prefer to stay in feeding area, thus benefiting from the cooling effect of water sprinkled by the showers and of the air streams created by the fans. With air temperatures increasing from 21℃ to 33 ℃ the cows reduce the staying in the cubicles, which gets down from 540 to 32% (r2 = 0.2608). As regards the efficacy of zone cooling system in the cubicles, the results are not particularly encouraging. The cows continue to use the cubicles without changing the behaviour in relation to the presence of conditioned air flow. 展开更多
关键词 Dairy cows BEHAVIOUR microclimatic conditions cooling systems cubicles
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Theoretical Analysis of Cold Storage Devices in a CO2 Transcritical/Subcritical Supermarket Refrigeration Plant
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作者 Claudio Ferrandi Maurizio Orlandi 《Journal of Energy and Power Engineering》 2013年第1期17-25,共9页
This paper proposes a theoretical study of a cold storage system in a CO2 (carbon dioxide) MT (medium temperature) plant for supermarkets application. The aim of this plant strategy is that in the daily hours the ... This paper proposes a theoretical study of a cold storage system in a CO2 (carbon dioxide) MT (medium temperature) plant for supermarkets application. The aim of this plant strategy is that in the daily hours the storage can export heat form the refrigerant outcoming the gas cooler/condenser whereas during the nightly hours it can be maintained cooled by this latter before its incoming into the evaporator. Besides, the storage can be used for reducing the energy peak consumption, permitting to size the plant on a lower energy target, and it can influence the choice of the optimisation logic of the plant controller, in this work a model for a MT CO2 transcritical/subcritical cycle, able to manage the transient due to the changes of loads and external conditions, is proposed to take into account the evolution with time in a fixed time step. A parametrical analysis has been conduced for understanding the optimal design of the plant. A seasonal analysis is considered too, for understanding the cold storage benefits in different periods of year. 展开更多
关键词 Cold storage C02 refrigeration plant energy saving daily and seasonal analysis cold storage parametric analysis.
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Application of Aspen to Lithium Bromide Refrigerator
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作者 Xinli Wei Wenrui Mao 《International Journal of Technology Management》 2013年第1期115-117,共3页
By transforming the original interstage compression cooling system of nitrogen fertilizer plant and adding lithium bromide refrigerator, the paper designs a new compressor interstage cooling system which leads interst... By transforming the original interstage compression cooling system of nitrogen fertilizer plant and adding lithium bromide refrigerator, the paper designs a new compressor interstage cooling system which leads interstage heat in lithium bromide refrigerator and uses the obtained cooling capacity to reduce the temperature of compressed gas. And aspen is used to simulate the new process. Lastly, the paper makes economical and feasible conclusion. 展开更多
关键词 ASPEN lithium bromide refrigerator synthesis ammonia
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Heat Transfer Optimization for Air-Mist Cooling between a Stack of Parallel Plates 被引量:3
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作者 Roy J.Issa 《Journal of Thermal Science》 SCIE EI CAS CSCD 2010年第3期253-260,共8页
A theoretical model is developed to predict the upper limit heat transfer between a stack of parallel plates subject to multiphase cooling by air-mist flow.The model predicts the optimal separation distance between th... A theoretical model is developed to predict the upper limit heat transfer between a stack of parallel plates subject to multiphase cooling by air-mist flow.The model predicts the optimal separation distance between the plates based on the development of the boundary layers for small and large separation distances,and for dilute mist conditions.Simulation results show the optimal separation distance to be strongly dependent on the liquid-to-air mass flow rate loading ratio,and reach a limit for a critical loading.For these dilute spray conditions,complete evaporation of the droplets takes place.Simulation results also show the optimal separation distance decreases with the increase in the mist flow rate.The proposed theoretical model shall lead to a better understanding of the design of fins spacing in heat exchangers where multiphase spray cooling is used. 展开更多
关键词 Air-mist MULTIPHASE Heat transfer Liquid-to-air loading
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Distribution optimization of circulating water in air-cooled heat exchangers for a typical indirect dry cooling system on the basis of entransy dissipation 被引量:4
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作者 SUN Jian YUAN Kai +3 位作者 YANG Li Jun CHEN Lin DU Xiao Ze YANG Yong Ping 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2015年第4期617-629,共13页
The flow and heat transfer of air-cooled heat exchangers play important roles in the performance of indirect dry cooling systems in power plants,so it is of benefit to the design and operation of a typical indirect dr... The flow and heat transfer of air-cooled heat exchangers play important roles in the performance of indirect dry cooling systems in power plants,so it is of benefit to the design and operation of a typical indirect dry cooling system to optimize the thermo-flow characteristics of air-cooled heat exchangers.The entransy dissipation method is applied to the performance optimization of air-cooled heat exchangers in this paper.Two irreversible heat transfer processes in air-cooled heat exchangers,the heat transfer between circulating water and cooling air and the mixing of circulating water,are taken into account and analyzed by means of the entransy dissipation method.The total entransy dissipation rate,which connects the geometrical parameters of air-cooled heat exchanger sectors and the heat capacity rates of the fluids to the heat flow rate in every sector,is obtained.Based on the mathematical relation and the conditional extremum method,an optimization equation group is derived,by which the air-cooled heat exchanger with known air-side parameters is optimized,showing that the entransy dissipation based optimization approach can contribute to the distribution optimization of circulating water in air-cooled heat exchangers of a typical indirect dry cooling system. 展开更多
关键词 indirect dry cooling system air-cooled heat exchanger entransy dissipation OPTIMIZATION
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Improving Film Cooling Performance by Using One-Inlet and Double-Outlet Hole 被引量:3
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作者 Guang-chao Li and Wei Zhang Aeroengine and Energy Engineering College,Shenyang Areospace University Shenyang China 110136 《Journal of Thermal Science》 SCIE EI CAS CSCD 2010年第5期430-437,共8页
The film cooling performance of a trunk-branch hole is investigated by numerical simulation in this paper. The geometry of the hole is a novel cooling concept, which controls the vortices-pair existing at the mink hol... The film cooling performance of a trunk-branch hole is investigated by numerical simulation in this paper. The geometry of the hole is a novel cooling concept, which controls the vortices-pair existing at the mink hole outlet using the injection of the branch hole. The trunk-branch holes require easily machinable round hole as compared to the shaped holes. The flow cases were considered at the blowing ratios of 0.5, 0.75, 1.0, 1.5 and 2.0. At the low blowing ratio of 0.5, the vortices-pair at the outlet of the trunk hole is reduced and the laterally coverage of the film is improved. At the high blowing ratio of 2.0, the vortices-pair is killed by the vortex which is produced by the injection of the branch hole. The flow rate of the two outlets becomes more significantly different when the blowing ratio increases from 0.75 to 2.0. The discharge coefficients increase 0.15 and the laterally averaged film effectiveness improve 0.2 as compared to the cylindrical holes. The optimal blowing ratios occur at M=1.0 or M= 1.5 according to the various locations downstream of the holes. 展开更多
关键词 aerospace propulsion system gas turbine film cooling heat transfer
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Film Cooling Performance of a Row of Dual-fanned Holes at Various Injection Angles 被引量:4
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作者 LI Guangchao WANG Haofeng +2 位作者 ZHANG Wei KOU Zhihai XU Rangshu 《Journal of Thermal Science》 SCIE EI CAS CSCD 2017年第5期453-458,共6页
Film cooling performance about a row of dual-fanned holes with injection angles of 30°, 60 ° and 90° were experimentally investigated at blowing ratios of 1.0 and 2.0. Dual-fanned hole is a novel shaped... Film cooling performance about a row of dual-fanned holes with injection angles of 30°, 60 ° and 90° were experimentally investigated at blowing ratios of 1.0 and 2.0. Dual-fanned hole is a novel shaped hole which has both inlet expansion and outlet expansion. A transient thermochromic liquid crystal technique was used to reveal the local values of film cooling effectiveness and heat transfer coefficient. The results show that injection angles have strong influence on the two dimensional distributions of film cooling effectiveness and heat transfer coefficient. For the small injection angle of 30 degree and small blowing ratio of 1.0, there is only a narrow spanwise region covered with film. The increase of injection angle and blowing ratio both leads to the enhanced spanwise film diffusion, but reduced local cooling ability far away from the hole. Injection angles have comprehensive influence on the averaged film cooling effectiveness for various x/d locations. As injection angles are 30 and 60 degree, two bands of high heat transfer coefficients are found in mixing region of the gas and coolant. As injection angle increases to 90 degree, the mixing leads to the enhanced heat transfer region near the film hole. The averaged heat transfer coefficient increases with the increase of injection angle. 展开更多
关键词 gas turbine film cooling dual-fanned hole thermochromic liquid crystal technique
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Application of Taguchi Method for the Optimization of System Parameters of Centrifugal Evaporative Air Cooler 被引量:5
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作者 K.Senthilkumar PSS.Srinivasan 《Journal of Thermal Science》 SCIE EI CAS CSCD 2010年第5期473-479,共7页
A new evaporative cooling system based on the action of centrifugal forces is proposed.Such systems are suitable for cooling large air volumes in tropical climates.Effects of geometrical and operational parameters on ... A new evaporative cooling system based on the action of centrifugal forces is proposed.Such systems are suitable for cooling large air volumes in tropical climates.Effects of geometrical and operational parameters on system performance are optimized using Taguchi method.It is observed that disc speed,air flow rate and water flow rate are found to have major influence on system performance and other parameter,viz.,disc diameter,pin geometry,evaporation chamber length and orientation of pin have less influence. 展开更多
关键词 HUMIDIFIER Evaporative air cooler Centrifugal force Taguchi method
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Research on Cooling Effectiveness in Stepped Slot Film Cooling Vane
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作者 LI Yulong WU Hong +1 位作者 ZHOU Feng RONG Chengjun 《Journal of Thermal Science》 SCIE EI CAS CSCD 2016年第3期273-279,共7页
As one of the most important developments in air cooling technology for hot parts of the aero-engine, film cool- ing technology has been widely used. Film cooling hole structure exists mainly in areas that have high t... As one of the most important developments in air cooling technology for hot parts of the aero-engine, film cool- ing technology has been widely used. Film cooling hole structure exists mainly in areas that have high temperature, uneven cooling effectiveness issues when in actual use. The first stage turbine vanes of the aero-engine consume the largest portion of cooling air, thereby the research on reducing the amount of cooling air has the greatest potential. A new stopped slot film cooling vane with a high cooling effectiveness and a high cooling uniformity was researched initially. Through numerical methods, the affecting factors of the cooling effectiveness of a vane with the stepped slot film cooling structure were researched. This paper focuses on the cooling effectiveness and the pressure loss in different blowing ratio conditions, then the most reasonable and scientific structure parameter can be obtained by analyzing the results. The results show that 1.0 mm is the optimum slot width and 10.0 is the most reasonable blowing ratio. Under this condition, the vane achieved the best cooling result and the highest cooling effectiveness, and also retained a low pressure loss. 展开更多
关键词 Film cooling Cooling effectiveness Blowing ratio Pressure loss
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Simulation of 3D Flow in Turbine Blade Rows including the Effects of Coolant Ejection
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作者 Jian-Jun LIU Bai-Tao AN Yun-Tao ZENG 《Journal of Thermal Science》 SCIE EI CAS CSCD 2008年第2期111-115,共5页
This paper describes the numerical simulation of three-dimensional viscous flows in fir-cooled turbine blade rows with the effects of coolant ejection. A TVD Navier-Stokes flow solver incorporated with Baldwin-Lomax t... This paper describes the numerical simulation of three-dimensional viscous flows in fir-cooled turbine blade rows with the effects of coolant ejection. A TVD Navier-Stokes flow solver incorporated with Baldwin-Lomax turbulence model and multi-grid convergence acceleration algorithm are used for the simulation. The influences of coolant ejection on the main flow are accounted by volumetric coolant source terms. Numerical results for a four-stage turbine are presented and discussed. 展开更多
关键词 Numerical Simulation Air-Cooled Turbine Blade Row Coolant Ejection
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