Hydraulic design of a hydrodynamic machine is designed to achieve a high value of energy transformation efficiency. Pumps and turbines have some different typical features in hydraulic design. With the aid of computational fluid dynamics, adjustments of the hydraulic parts of a standard centrifugal pump are assessed with the aim to increase hydraulic efficiency of the pump running as turbine. The impeller, volute casing and added draft tube are discussed.

This master‘s thesis deals with a centrifugal pump running in reverse (turbine) mode, often called “pump-as-turbine”. The introduction lists basic principles and information about the direct (pump) and reverse modes. Several methodologies for predicting reverse operating point and efficiency evolution are used and compared with simulation results. Using CFD simulations, results obtained with simplified (excluding impeller side wall gaps) and complete geometry (including impeller side wall gaps) are assessed. Furthermore, the results of impeller trimming are evaluated with an aim to find the maximum power and efficiency. Impeller side wall gaps effect is analyzed in terms of friction torque and power loss.

The aim of the diploma thesis is to design the technical solution of minimization of frictional losses, which occur when using a sine pump at position of the shaft locking and on the impeller wheel. The losses originating from the frictional forces have a negative influence on the lifetime of individual parts and economy of the pump. In the first part the author describes sine pumps from the constructional point of view and the main producers are mentioned. The second part contains suggestions on the parameters of the pump and various possibilities of solutions. The last part covers the experiment and conclusions.

The dissertation with the topic Ground as an Energy Source discusses the utilisation of horizontal heat exchangers as sources of heat at low temperature for heat pumps. Chapter Current Situation in the Field describes the environmental properties of heat pumps, the effects existing in the ground and the individual types of ground heat exchangers. Chapter Objectives and Hypotheses of the Dissertation lays down the individual hypotheses of the research and the objectives of the dissertation. The theoretical part of the Set of Methods chapter gives an understanding of the mathematical relationships describing the theory of heat sharing in the ground, the measurement methods, the method of processing experimental data, and the measuring instruments used. The Results and Discussion chapter includes the basic findings and opinions processed on the basis of values measured. The final chapter Conclusions and Recommendations for Practical Use comments on the results achieved and elaborates on utilising horizontal heat exchangers in practice.

The aim of this thesis is a preliminary draft of test equipment for testing fuel injectors Common Rail system with the drive shaft radial loading. The work presents a brief overview of the contemporary designs of the pump system, which then leads on equipment design.

This diploma thesis deals with the design of thermodynamic heat pump, used to utilize thermal energy of flue gases arised from the combustion of natural gas in a heat exchanger. The flow rates of the compader compressor, bypass compressor and turbine are calculated. Part of this thesis is simplified design of gearbox and economical evaluation of heat pump installation. The appendix of the thesis contains technical documentation.

The diploma thesis is concerned with selection of the optimal heat pump for model family house heating (and domestic hot water – DHW - preparation) where the preferred aspect is the fastest economic return. As a part of the diploma thesis there is an introduction into the heat pumps field and also heat pumps dividing according to their lowpotential heat withdrawing. Calculating part includes both heat loss and electric energy consumption calculation of the object. Moreover there is stated a presentation of leading heat pump producers in the Czech Republic, including their price bids which are compared with their economic return. In conclusion there is presented an economic comparison of electric energy consumption of the object which is provided with the heat pump in contrast to other regular heating systems.

Target of diploma thesis The Operating Point of the Centrifugal Pump was create program for analyze system of pumps, it would be an effective instrument at projection these systems. Program is divided into two parts: system characteristic and performance characteristic. Subject of this thesis is create pumps database, enter performance characteristics and succeeding working with them. Program enable regulation pump with change speed and cooperation two pumps, work in parallel or series. The result of program is project system of pumps on enter parameters with more economy work.

This master's thesis contains basic hydraulic calculations, design and optimalization of both the rotor and stator part of the axial pump. There is also included an analysis of the principle and function of hydrodynamic axial pumps. The last part of this work is focusing on the strength calculations and flow simulations using CFD.

The master thesis is focused on the examination of the influence of the impeller eye on the stability of Q-Y curves. It is the examination of the impact of a large inlet angle of the blade and the extension of the inlet part, which also supports good cavitation capabilities. Another consideration is the influence of the rotating fluid before the impeller, influence of the circumferential component of the absolute velocity at the inlet part. The proposed modification will be subject to simulation in ANSYS.