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a b s t r a c tThis article deals with the acquiring of low-potential energy with vertical ground heat exchangers and gravity U-tube. These two systems are a part of the device (simulator) for low-potential heat transport through the phase changes in the vaporization and the condensation part of the tube at temperatures below 0°C. So, the device thus allows a development of research activities during the verification of the technological production of a heat pipe that is suitable for the utilization of terrestrial heat at low temperature in a laboratory environment. The individual components of the device allow a research of thermo-kinetic heat transport parameters and realistic modeling of a heat flow from the rock into the heat transfer fluid.

Visualization of heat transport in heat pipes using thermocamera Heat pipes, as passive elements show a high level of reliability when taking heat away and they can take away heat flows having a significantly higher density than systems with forced convection. A heat pipe is a hermetically closed duct, filled with working fluid. Transport of heat in heat pipes is procured by the change of state of the working fluid from liquid state to steam and vice versa and depends on the hydrodynamic and heat processes in the pipe. This study have been focused on observing the impact these processes have on the heat process, the transport of heat within the heat pipe with the help of thermovision. The experiment is oriented at scanning the changes in the surface temperatures of the basic structural types of capillary heat pipes in vertical position.

This article describes a measuring methods and evaluating measured data on a single-stage axial turbine with reaction (~ 50 %). One turbine operating mode was selected, in which the traversing behind the nozzle and bucket with two 5-hole pneumatic probes took place. The results are distributions of flow angles, reactions, or losses distribution/efficiencies along the blades.

Abstract.Hydrates of the natural gas in the lithosphere are a very important potential source of energy that will be probably used in the coming decades. It seems as promising accumulation of the standard gas to form hydrates synthetically, stored, and disengage him when is peak demand. Storage of natural gas or biomethane in hydrates is advantageous not only in terms of storage capacity, but also from the aspect of safety storage hydrates. The gas stored in such form may occurs at relatively high temperatures and low pressures in comparison to other Technologies of gas-storage. In one cubic meter of hydrate can be stored up to 150 m 3 of natural gas, depending on the conditions of thermobaric hydrate generation. This article discusses the design of the facility for the continuous generation of hydrates of natural gas measurement methodology and optimal conditions for their generation.