A turbine based domestic micro ORC system

Klonowicz, Piotr; Witanowski, Łukasz; Jędrzejewski, Łukasz; Suchocki, Tomasz; Lampart, Piotr

doi:10.1016/j.egypro.2017.09.112

Cited by 21 publications

(11 citation statements)

References 17 publications

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“…ORC systems can also be fed with waste heat coming from industrial processes or combustion engines [5]. For electricity generation in such systems, various types of volumetric and dynamic expanders [6] can be used, such as screw expanders, scroll expanders [7], piston expanders [8], vane expanders [9] or turbine expanders [10]. In micro-power ORC systems, microturbines of different types are increasingly used as expanders [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Investigation of dynamic properties of the microturbine with a maximum rotational speed of 120 krpm – predictions and experimental tests

Żywica¹,

Kaczmarczyk²,

Breńkacz³

et al. 2020

J. vibroeng.

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Advances in the development of analysis and design methods for fluid-flow machines have enabled both their multi-criteria optimisation and miniaturisation. To decrease the size of such a machine whilst, at the same time, maintaining its output power level, the rotor's rotational speed needs to be increased. It is the reason for serious difficulties with respect to the rotor dynamics and the selection of a bearing system. This article discusses the simulation analysis and experimental research carried out on a prototypical microturbine, designed for use in a domestic ORC (organic Rankine cycle) cogeneration system. During the design process, the basic assumption was to develop a turbomachine, whose dimensions would have been as small as possible and whose output electric power would have been about 1 kilowatt. A supersonic impulse turbine, with a nominal rotational speed of 100,000 rpm, was used in order to obtain high flow efficiency. The maximum speed of the rotor was determined at a level of 120,000 rpm. The article presents the results of analyses made at the design stage and preliminary results of the experimental research. The numerical simulations covered the bearing system optimisation and the rotor dynamics analysis. Next, based on the outcomes of these analyses, a decision was made to use non-conventional gas bearings which are fed by the low-boiling medium's vapour that comes from the ORC system. Within the framework of the experimental research, the dynamic behaviour of the turbogenerator was examined in terms of the rotational speed and produced energy. The performed measurements are proof of very good dynamic properties of the tested machine and after the research was over it was concluded that there were absolutely no signs of wear of the turbogenerator's subassemblies.

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Section: Introductionmentioning

confidence: 99%

Investigation of dynamic properties of the microturbine with a maximum rotational speed of 120 krpm – predictions and experimental tests

Żywica¹,

Kaczmarczyk²,

Breńkacz³

et al. 2020

J. vibroeng.

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“…The fact that the working medium can evaporate in a low temperature enables the use of ORC systems in the domestic environment. They can operate in combination with solar collectors or biomass-fired boilers and can be used for waste heat recovery [13][14][15][16]. Moreover, during the building of new installations, their designers try to minimise CO 2 emissions, which is a positive trend worth mentioning [17,18].…”

Section: Introductionmentioning

confidence: 99%

Stress analysis of the discs of axial-flow microturbines

Bagiński¹,

Zych²,

Żywica³

2020

J. vibroeng.

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The article discusses the mesh creation techniques for models of discs of axial-flow microturbines. A universal method of optimization of such devices, in terms of their strength improvement, has been proposed. The research focused on microturbines that can operate in combination with ORC systems, especially the ones whose discs have many structural components such as pins or chamfers. Calculations were done using the commercial software ANSYS Workbench. Both tetrahedral and hexahedral grids were used in the analysed models. The calculation time needed for the grid preparation was regarded as an important parameter. Therefore, the reference model was created using the disc slice method. The results obtained for the models that included the full complex geometry of the disc were compared with the results obtained for the reference model. The mesh size coefficient was defined. It enabled to simplify the strength optimisation method for discs of axial-flow microturbine and also made it more universal. After carrying out all analyses and computations, it was possible to develop a scheme of conduct during the optimization of the aforementioned expansion devices.

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“…Also it is proposed to improve the environmental situation in agrocomplexes. In this situation, the Rankine organic cycle is used to increase efficiency [1][2][3][4]. Technologies that increase boiler and thermal power plants efficiency are known.…”

Section: Introductionmentioning

confidence: 99%

Environmentally Friendly Organic Rankine Cycle Technology Based on Improved Absorption Refrigerating Machine

Осинцев¹,

Дудкин²,

Prikhodko³

et al. 2019

Proceedings of the VIII Science and Technology Conference “Contemporary Issues of Geology, Geophysics and Geo-Ecology of the No

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The purpose of the work is the development of environmentally friendly technology of heat recovery from condensation of water vapor at a constant partial pressure of the outgoing flue gases in contact heat exchangers with a passive nozzle at thermal power plants running on natural gas, and the use of solar heaters in the block structure of an absorption refrigerating machine. Using contact heat exchangers can reduce greenhouse gas emissions. Greenhouse gas is harmful to the environment. Using solar heaters can improve the efficiency of the Li-Br absorption refrigerating machine. Ways to improve the efficiency of industrial enterprises are different. One of the main ways is to use renewable energy for heat recovery. In addition, the use of renewable energy sources reduces emissions of harmful greenhouse gases into the atmosphere.

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A turbine based domestic micro ORC system

Cited by 21 publications

References 17 publications

Investigation of dynamic properties of the microturbine with a maximum rotational speed of 120 krpm – predictions and experimental tests

Investigation of dynamic properties of the microturbine with a maximum rotational speed of 120 krpm – predictions and experimental tests

Stress analysis of the discs of axial-flow microturbines

Environmentally Friendly Organic Rankine Cycle Technology Based on Improved Absorption Refrigerating Machine

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