Experimental investigation of the domestic CHP ORC system in transient operating conditions

Żywica, Grzegorz; Kaczmarczyk, Tomasz Z.; Ihnatowicz, Eugeniusz; Turzyński, Tomasz

doi:10.1016/j.egypro.2017.09.123

Cited by 27 publications

(10 citation statements)

References 17 publications

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“…In Ref. [10], the performance of a biomass-fuelled micro-CHP-ORC prototype is assessed under different operating conditions, but although the prototype confirms the benefits of the system, no optimization technique is tested. Similarly, Ref.…”

Section: Chp Field Trialsmentioning

confidence: 99%

Stochastic real-time operation control of a combined heat and power (CHP) system under uncertainty

Olympios

Brun

Acha

et al. 2020

Energy Conversion and Management

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Section: Chp Field Trialsmentioning

confidence: 99%

Stochastic real-time operation control of a combined heat and power (CHP) system under uncertainty

Olympios

Brun

Acha

et al. 2020

Energy Conversion and Management

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“…The bearing system and dynamic properties of the rotor are optimised to minimise vibrations at the nominal rotational speed of the turbine, but lower speeds (i.e. speeds at which the rotor rotates during its run-up) should also be taken into account [6]. Some bearing systems require the bearings to be cooled in order to protect them against damage due to high temperatures [7].…”

Section: Introductionmentioning

confidence: 99%

Selection of the oil-free bearing system for a 30 kW ORC microturbine

Breńkacz¹,

Żywica²,

Bogulicz³

2019

J. vibroeng.

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The article discusses results of the analyses of various bearing systems for the rotor of an ORC (Organic Rankine Cycle) microturbine with an electric power of 30 kW. It is impossible to choose the appropriate bearing system taking into account only basic parameters of the bearings. When designing a new power turbine, it is important to conduct the dynamic and strength analysis of the entire rotor-bearings-supporting structure system. The nominal rotational speed of the newly designed single-stage axial-flow turbine is 40,000 rpm. The turbine will be powered using the vapour of a low-boiling working medium. The chosen working medium cannot be used in combination with all materials that are commonly used for turbine constructions. An additional requirement was that the turbogenerator must be oil-free. The temperature of the working medium directed to the rotor blades could exceed a value of 200 °C. Three bearing systems were considered: bearings lubricated with a low-boiling fluid (in the liquid form), gas bearings lubricated with the vapour of a low-boiling medium and rolling bearings. Since the rotors used in those three systems have different geometries, their dynamic properties vary as well. The rotor dynamics analyses were carried out using computer programs belonging to the MESWIR environment, which had been developed at the Institute of Fluid-Flow Machinery of the Polish Academy of Sciences (IMP PAN) in Gdańsk. The computational model, based on the finite element method, was used to prepare graphs on which are presented vibration amplitudes as functions of the rotational speed. The computational model, based on the finite element method, served to perform calculations on the basis of which graphs presenting vibration amplitudes as functions of the rotational speed were prepared. Moreover, vibration trajectories of individual nodes of the computational model were shown. Besides analyses of the bearings themselves, calculations were also carried out to assess the dynamic properties of the rotors supported by those bearings in a wide range of rotational speeds. As a result of the conducted analyses, the concept of an innovative turbogenerator was created. Its rotor can operate at a very high rotational speed, and the bearings do not require oil lubrication.

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“…The prototypes of axial-flow and radial-flow micro turbines were designed, developed and successfully tested. The results of these surveys were presented in a number of books [3][4][5][6][7][8] and papers [9][10][11][12][13][14][15][16][17][18]. However, despite the successful experimental investigations, currently there are no commercially viable ORC-dedicated micro turbines yet available.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Applied Working Fluid and the Arrangement of the Steering Edges on Multi-Vane Expander Performance in Micro ORC System

2018

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Micro-power domestic organic Rankine cycle (ORC) systems are nowadays of great interest. These systems are considered for combined heat and power (CHP) generation in domestic and distributed applications. The main issues of ORC systems design is selection of the expander and the working fluid. Thanks to their positive features, multi-vane expanders are especially promising for application in micro-power ORC systems. These expanders are very simple in design, small in dimensions, inexpensive and feature low gas flow capacity and expansion ratio. The application of multi-vane expanders in ORC systems is innovative and currently limited to prototype applications. However, a literature review indicates the growing interest in these machines and the potential for practical implementation. For this reason, it is necessary to conduct detailed studies on the multi-vane expanders operation in ORC systems. In this paper the results of experimental and numerical investigations on the influence of the applied working fluid and the arrangement of the steering edges on multi-vane expander performance in micro ORC system are reported. The experiments were performed using the specially designed lab test-stand, i.e. the domestic ORC system. Numerical simulations were proceeded in ANSYS CFX software (ANSYS, Inc., Canonsburg, PA, USA) and were focused on determining the expander performance under various flow conditions of different working fluids. Detailed numerical analysis of the arrangement of the machine steering edges showed existence of optimal mutual position of the inlet and outlet port for which the multi-vane expander achieves maximum internal work and internal efficiency.

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Experimental investigation of the domestic CHP ORC system in transient operating conditions

Cited by 27 publications

References 17 publications

Stochastic real-time operation control of a combined heat and power (CHP) system under uncertainty

Stochastic real-time operation control of a combined heat and power (CHP) system under uncertainty

Selection of the oil-free bearing system for a 30 kW ORC microturbine

Influence of the Applied Working Fluid and the Arrangement of the Steering Edges on Multi-Vane Expander Performance in Micro ORC System

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