The paper is concerned with computational simulation of stator winding heating of the synchronous machine. Software ANSYS 8.0 was used for computational simulation. Computational model considers heat pipe in the middle of winding slot. The results of computer simulation show the effect of direct winding cooling with water. The results of both methods of cooling were compared. Experimental device was created for verification of computational simulations. and Obsahuje seznam literatury
There are many areas in the steel and metallurgy industry where pure water cannot be used as a coolant. Lubrication and corrosion are the two main factors why spray cooling has to use different cooling liquids. A typical example is cold rolling of steel where emulsions are used or rolling of some non-ferrous metals where pure oils are used. Other metallurgical processes use water polluted by oil or containing mineral salts. The spray cooling efficiency of these coolants is different from the cooln slats. The spray cooling efficiency of these coolants is different from the cooling efficiency of pure water. This paper describes a research comparing the spray cooling by pure water to the cooling using water-base oil emulsions of different concentrations, cooling using oil, and cooling using polluted water. This comparison was done by the measurements of the cooling efficiency characterised by the heat transfer coefficient for identical pressure. and Obsahuje seznam literatury
This paper is concerned with unconventional water cooling that is primarily intended for medium-power synchronous generators. A configuration of the proposed cooling was briefly described here. A way how to estimate the main thermal resistance related to the new water cooling system was presented here. A small induction motor was selected for practical verification of the proposed cooling concept. Measurements extended on this motor showed correctness of water cooling parameters design and superiority of this cooling method comparing to another traditional methods of cooling. and Obsahuje seznam literatury