Self-circulating Evaporative Cooling Research Articles

Design Optimization and Performance Evaluation of a Low-Pressure Drop Air-Cooled Condenser for Self-Circulating Evaporative Cooling Systems

Design Optimization and Performance Evaluation of a Low-Pressure Drop Air-Cooled Condenser for Self-Circulating Evaporative Cooling Systems

Self-Circulating Evaporative Cooling System of a Rotor and Its Experimental Verification

With the development of hydropower, the heat problem of a rotor cannot be ignored. This paper presents a topology of an evaporative cooling system for rotors. The system seals the pole coil in a tank and immerses the coil in the insulating coolant with a suitable boiling point. The latent heat of vaporization during the boiling of coolant is used to control the temperature rise of the pole coil. After explaining the circulation principle of the system, the effectiveness of the cooling system is verified by experiments. A small-scale experimental platform has been set up to test the effectiveness of the new topology. The comparison experiment with air-cooling shows that the phase change cooling system can not only provide hundreds of times the heat transfer capacity of air-cooling, but also the temperature rise of the coil is half that of air cooling. Based on the experimental results, the calculated formula of the heat transfer coefficient of the evaporative cooling system in the rotating state was fitted, and the deviation of the calculated result could be kept at less than 25%. Thanks to the evaporative cooling system, the rotor carries a high current density.

Research on Resistance Characteristics of the Self-circulating Evaporative Cooling System for Traction Transformer

Compared with the tradition cooling technology, the evaporative cooling technology has the advantage of energy-saving, safety and reliability. So a self-circulating evaporative cooling structure was proposed. The narrow flow channels were designed between disk-type windings. The evaporative coolant flows in the narrow flow channels and takes away the heat loss through phase transition. In this paper the resistance characteristics of the system were studied through experiment based on the 900kVA transformer prototype.

Research on the Feasibility of the Self-circulating Evaporative Cooling System with Composites Structure for High Power Rectifier Equipment

Self-circulating evaporative cooling system is safe, effective and energy-saving. It has advantages compared with the traditional cooling technology. So it provides a new cooling method for high power rectifier equipment. Then take an example of the three-phase bridge full-controlled rectifier, a new cooling system with composite structure and non-single heat loads was proposed. Through analysis on the circulation mechanism and operation characteristics, the feasibility of the self-circulating evaporative cooling system which is composed of horizontal and vertical hollow conductor was studied in this paper.

The Experimental Research of the Application of Liquid-Box Self-Circulation Evaporative Cooling System in Electronic Components

Because of high cooling efficiency, simple structure and good reliability, the liquid-box self-circulation evaporative cooling system has broad applications in the field of electronic equipments. By designing and developing a set of Liquid-box self-circulating evaporative cooling system experimental platform for electronic components. We can study the influence of pipe diameter, height of liquid level and thermal conductive pad on the cooling efficiency of the system.

Research on Varying Duty Operation of Self-Circulation Evaporative Cooling System of Single Stator Collector Ring in Hydro-Generator

With the advantage of high-security, energy-saving and high efficiency, the self-circulation evaporative cooling technology provides an ideal solution for the cooling problem of stator collector ring in hydro-generator. In this paper, the operation characteristics of self-circulation evaporative cooling system of single stator collector ring under different work conditions were analyzed by experiments. The experimental results show that the cooling performance of this new cooling system is satisfactory. The temperature distribution of stator collector ring and system pressure distribution were discussed on the basis of experimental data and those variation tendencies were concluded. The research results in this paper provide the basis for further researches and practical application of this new cooling system.

Study of the Thermodynamic Processes and Performance Evaluation of Self-Circulation Evaporative Cooling System in Hydro-Generator

The self-circulation evaporative cooling system (SECS) of stator collector ring is a kind of new cooling technology, utilizing the evaporating of work fluid to cool the stator collector ring of hydro-generator. In this article, the thermodynamic processes of SECS of stator collector ring were analyzed by the second law of thermodynamics. The entropy production and power loss of isolated SECS were analyzed. Based on the distinctive characteristics of SECS, a performance evaluation function was proposed. The influence of heat load on was discussed by simulating. The conclusions provide the theory basis for the application of this new cooling technology.

Structure Optimization of Air Cooling Condenser in Close-Loop Self-Circulation Evaporative Cooling System of Wind Generator

Being a widely used clean and renewable energy, the wind power has attracted the attention of all nations in the world. The application of air cooled close-loop self-circulation evaporative cooling technology in the cooling of large wind power generator is a new attempt in the discovery of wind power energy. The structure of the air cooling condenser has great effect on the smooth running of the natural temperature close-loop self-circulation (CLSC) evaporative cooling system of large wind power generator. An optimum structure of the air cooling condenser for the evaporative cooling system is introduced in this paper which can do great help to insure the successful running of wind generator. All these will do great help to the development of the evaporative cooling large wind power generator.

Application of Air-Cooled Close-Loop Self-Circulation Evaporative Cooling System on Wind Power Generator

The application of evaporative cooling technology in the cooling of large wind power generator is a new attempt in the discovery of wind power energy. In some particular circumstances, the air-cooling condenser must be adopted as the secondary cooler in the evaporative cooling system of large wind generator. For the cooling medium in the air-cooling condenser is the air and the distribution of temperature is uneven along the cooling tube, so it’s necessary to do deep research on it. Experiments are carried out to study the heat transfer characteristics of the air-cooling condenser used in the Close-loop Self-circulating (CLSC) evaporative cooling system. The temperature distribution and the heat transfer can be acquired from the experiment. Thorough study is carried out on restart up of the close-loop evaporative cooling system of the wind power generator. Experiments are done in the laboratory and real wind power generator, and it’s found that there is a critical point in the restart up of the generator. Only if the flow head overcome the critical point can the wind power generator restart automatically. The result shows that heat transfer can be enhanced by some special method and the air-cooling condenser can satisfy the demand of the cooling system.