Original construction solutions for two types of fine bubble generators whose nozzles are manufactured by electroerosion are presented. The differential equation of the transfer speed of the oxygen towards water is numerically integrated and theoretical results are presented. A setup for experimental tests regarding the functioning of fine bubble generators was designed and built in the frame of the laboratory. Measurements regarding the increase of the concentration of oxygen dissolved in water were performed. Theoretical and experimental results were compared.

The paper aims to present a procedure of measuring concentration of oxygen dissolved in water; this procedure is based on the electrochemical method. The differential equation of the transfer speed of the oxygen towards water is numerically integrated and theoretical results are presented. A setup used for experimental researches regarding water oxygenation was subsequently developed; measurements regarding the increase of the concentration of oxygen dissolved in water were performed. Theoretical and experimental results were compared.

The paper establishes an original computation formula for the flow rate of the fluid transported by a new type of rotating machine with profiled rotors; the theoretical characteristic diagram of the machine - flow rate versus machine speed - is built. The scheme of the test stand used for performing measurements needed in order to build the experimental diagram is presented. The variation of the volumetric efficiency of the working machine in function of the machine speed is finally described.

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The paper presents the constructive solution and the functioning principle of a new type of rotating motor that integrates an energy cogeneration plant. Mechanical power developed by the motor and the steam flow rate needed for the driving of the rotating motor are computed. Finally, there are determined the constructive and functional parameters of this type of motor, that represents the purpose of a scientific research contract in 2011.