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Background Euplotes, a ciliated protozoan, is a useful unicellular model organism. Studies on Euplotes have provided excellent insights into various basic biological principles. We have recently sequenced the macronuclear genome of the common freshwater species Euplotes octocarinatus to provide novel insights into Euplotes genetics and molecular biology. Results In this study, we present the E. octocarinatus...
Spray cooling is a new type of high heat flux heat transfer cooling technology. In the process, cooling medium is dispersed certain microscale droplets through the nozzles and injected to the stator core and winding. The spray characteristics will affect directly the heat transfer coefficient. So in the paper a test rig using a nozzle was constructed to explore the atomization characteristics of spray...
The Power density of ECRIS magnet coil is larger than 3000kW/m3, and evaporative cooling technology is an ideal method to achieve the cooling requirement. The two phase flow of evaporative cooling system affects the cooling efficiency of coil. This paper introduces the self-driven evaporative cooling system of magnet, and analyses the pie structure of magnet coil and two phase flow channel in the...
Overload performance of permanent magnet motor is very important for some special occasions, which has been generally limited by temperature rise of stator. This paper introduces a new method based on heat storage of phase change paraffin to enhance the overload performance of motor. The heat variation of motor was analyzed under overload process, and the key affecting factors were given to control...
With the increase of the electrical machines capacity and voltage level, the main insulation of the stator coil becomes thicker. Heat dissipation and voltage endurance becomes a contradiction. The traditional cooling, such as air-cooling and water-cooling, will not well meet design needs. New cooling methods with both advantages of good cooling effect and good insulation are in keen demand in industry...
With the increase of motor capacity and voltage grade, the thickness of the stator insulation certainly will be more and more thick. So these factors will make the design of the insulation and cooling critical. In this work, in order to apply spray evaporative cooling to the large motor, new insulate system is researched experimentally by IEECAS. And it adequately research on testing of partial discharge...
Spray cooling is a kind of phase change cooling technology. The heat transfer is more effective than traditional and immersing evaporative cooling, due to the combined effect of forced convection and nucleate boiling. In the process, cooling medium is sprayed into certain micro-scale droplets through the nozzles and injected to the stator core and winding. The spray characteristics will affect directly...
Based on engineering application, the researchers put forward to further optimization design to the spray evaporative-cooling electrical machine. In this paper, the optimization design is introduced in detail. The cooling structure and system parameters will also be provided. All these optimization designs will provide more design basis for evaporative cooling design.
With the improvement of people's living standards, more attention is given to health status. This is a higher demand for our modern medical facilities. How to let the sign detection equipment out of intensive care unit (ICU), out of hospital, become accessible and can be used for real-time monitoring of the life necessities is a major topic currently. Based on this, the CSN808 module is used to design...
In 2010, the spray evaporative cooling technology was applied successfully to large electrical machines by IEECAS. But the heat transfer mechanism of two-phase spray cooling has not been studied in detail. Based on the engineering application, in this paper, the heat transfer characteristics of the spray evaporative cooling system will be discussed. The conclusion will provide reference for the design...
The 400MW evaporative cooling hydrogenerator in Lijiaxia hydropower station has been serving for more than 15 years. This paper gives a comprehensive evaluation of this unit from cooling mode selection, electrical magnetic scheme design, operating practice and temperature distribution. The application of the evaporative cooling technology to 400MW-grade hydrogenerator shows great advantages comparing...
This paper introduces a forced circulation evaporative cooling ECR ion source solenoids, through experimental research and theoretical analysis, we proved that there exists instability characteristic and this instability cannot be avoided for such a high power density application. Furthermore, we put forward an alternative cooling structure, immersion natural circulation cooling system, which performance...
Radial ventilation channel is a key component of large turbo generator stator, which affects the cooling of stator core and bars. The design of radial ventilation channel need simultaneously consider the flow resistance and cooling capacity. In this paper, the width of radial ventilation channel, the structure and material of support parts will be discussed to improve the cooling capacity of large...
Inner evaporative cooling way of stator bars is generally affected by circulating system and coolant. In this paper, we focus those factors to improve the capability of cooling system. Based on the flowing resistance distribution of system, the structure of components is redesigned to improve the stability and reliability of circulating flow. In the same time, different kinds of coolant are used into...
The coolant temperature of the condenser outlet is a parameter reflecting the condenser's performance in the evaporative cooling system of the hydro-generators, which was usually assumed to be a reasonable value in the previous simulation. However, with the change of the work state of the generator, the coolant temperature of the condenser outlet will be corresponding change, it is necessary to correctly...
The coolant dryness of the hollow conductor outlet is an important parameter relevant to the working state of the evaporative cooling system. It was calculated by the balance equation of the flowing pressure and the flowing resistance in the past. The conventional method was complex, therefore a new calculation method on the basis of the condenser's heat balance equation and over-all heat transfer...
when we design immersing evaporative cooling turbo generator, How to control the temperature rise of stator bars in an appropriate situation is one of the most important parts in the unit designing. In this paper, the heat flowing paths of stator components are analyzed in the immerging stator structure. Based on the heat transfer theories, Numerical simulation model is built for the stator temperature...
Self-circulation evaporative cooling system of stator collector ring of hydro-generator is a new cooling system, with advantage of high-security, energy-saving and high efficiency. In this paper, the loop resistance in single stator collector of hydro-generator was analyzed deeply and detailedly, by experiment and simulation. The simulation method of system resistance was introduced. The comparing...
Degradation of green plant waste is often difficult, and excess maturity times are typically required. In this study, we used lignin, cellulose and hemicellulose assays; scanning electron microscopy; infrared spectrum analysis and X-ray diffraction analysis to investigate the effects of chemical decomposition agents on the lignocellulose content of green plant waste, its structure and major functional...
In evaporative inner cooling generator, the total pressure drop in hollow conductor is composed of liquid phase and two-phase flow pressure drops. In recent researches, the two-phase flow pressure drop in hollow conductor was researched deeply and detailedly, but the liquid phase flow pressure drop was seldom researched. In fact, the liquid phase flow pressure drop is an important component of total...
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