Experimental and numerical analysis of a reciprocating piston expander with variable valve timing for small-scale organic Rankine cycle power systems

Wronski, Jorrit; Imran, Muhammad; Skovrup, Morten Juel; Haglind, Fredrik

doi:10.1016/j.apenergy.2019.04.028

Cited by 21 publications

(7 citation statements)

References 40 publications

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“…The valve's orifice size in the exhaust pipe was insufficient to allow the appropriate amount of air to escape from the SPE's cylinder. This condition is not good as the over-compression process creates negative work, increases the flow losses, and reduces the total work produced by most expansion devices, as the negative work will subtract the amount of the total work [25]. Therefore, at any time, the over-compression work should be minimized to improve the expander's total work, performance, and efficiency.…”

Section: Resultsmentioning

confidence: 99%

Feasibility study on the conversion of a small engine into a single-piston expander operating under different pressure and valve timing conditions

Mohamad

Salim

Muhammad

2022

J. Phys.: Conf. Ser.

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There are limited studies on improving the piston expander performance for a wider operating range by adopting the variable valve timing method. This study uses a simple conversion technique to develop a single-piston expander (SPE) from a small two-stroke engine. The SPE is being tested at different operating conditions to study the feasibility of the SPE operating under different intake pressure and valve timing conditions. By fixing the exhaust valve timing, the SPE was tested at four intake pressure; 3, 4, 5, and 6 bar, while the intake valve closing varied from 30° to 110°. From the study, the highest power produced by the SPE was only 64 Watt when tested at 6 bar, with the intake valve opening at TDC and closed at 70°. The results show that the converted SPE is feasible in terms of functionality, but it is not performance-wise because much power has been lost through the recompression process. The study also observed that the intake valve timing could significantly affect the SPE power output, besides the intake pressure alone.

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Section: Resultsmentioning

confidence: 99%

Feasibility study on the conversion of a small engine into a single-piston expander operating under different pressure and valve timing conditions

Mohamad

Salim

Muhammad

2022

J. Phys.: Conf. Ser.

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“…Therefore, they fit better to small scale ORCs. Piston [55][56][57][58][59][60][61], screw [62][63][64][65][66], scroll [67][68][69][70][71][72][73], lobe [74,75] and multi-vane [25] expanders can be applied in domestic ORCs. These expanders are at different stage of development.…”

Section: Design Considerations and Comparison Of Different Domestic Cmentioning

confidence: 99%

Domestic Organic Rankine Cycle-Based Cogeneration Systems as a Way to Reduce Dust Emissions in Municipal Heating

Kolasiński

2020

Energies

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Environmental issues are nowadays of great importance. In particular air and water quality should be kept at as high levels as possible. Energy conversion systems and devices which are applied for converting the chemical energy contained in different fuels into heat, electricity and cold in the industry and housing are sources of different gases and solid particle emissions. Medical data show PM2.5 dust in particular is highly dangerous for human health. Therefore, limiting the number of low-quality fuel combustion processes is a key issue of modern energy policy. Statistical data show that domestic heating systems account for a large share of the total emissions of PM2.5 and PM10 dust. For example in Poland in 2017, the share of households in the total annual emissions of PM2.5 dust was equal to ca. 35.8%, while the share of PM2.5 emission in industry (i.e., power generating plants, industrial power plants and technologies) was equal to only 23.6%. A possible way of solving this problem is by the successful replacement of old domestic furnaces by combined heat and power (CHP) or multigeneration boilers which can be used for heating the rooms and sanitary water and generating electricity and cold. Such systems can possibly contribute in the future to significant reductions of dust emissions and air pollution in urban and rural areas by limiting the number of low-quality fuel combustion processes. This article presents design considerations and experimental results related to a domestic micro-CHP unit which is based on organic Rankine cycle (ORC) technology. The main aim of the design works and experiments was therefore the analysis of the possibility of integrating the ORC system with a standard domestic central heating gas-fired boiler. The specially designed micro-ORC system was implemented in the laboratory and experiments were performed using this test stand. The main design aims of the test-stand were: low operating pressure, small working fluid flow, low price and compact dimensions. To meet these aims, volumetric machines were chosen as the expander and working fluid pump. The experimental results were positive and show that it is possible to integrate an ORC system with a standard domestic central heating gas boiler. For different heat source temperatures, the obtained expander power ranged from 109 W to 241 W and the thermodynamic cycle efficiency ranged from 4.3% to 8.8%. These positive research results were achieved partly thanks to the positive features of the different system subassemblies.

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“…In systems with a capacity less than 50 kW e , the turbines cannot be used due to high rotational speed and high cost (Imran et al, 2016). Reciprocating piston expanders (Wronski et al, 2019) and screw expanders (Bao and Zhao, 2013) can be used for small capacity plants. Scroll expanders and rotary vane expanders can be used in small or micro-scale ORC power systems (Bao and Zhao, 2013).…”

Section: Power Generationmentioning

confidence: 99%

Advances in Carbon Management Technologies

Sikdar¹,

Princiotta

2020

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Experimental and numerical analysis of a reciprocating piston expander with variable valve timing for small-scale organic Rankine cycle power systems

Cited by 21 publications

References 40 publications

Feasibility study on the conversion of a small engine into a single-piston expander operating under different pressure and valve timing conditions

Feasibility study on the conversion of a small engine into a single-piston expander operating under different pressure and valve timing conditions

Domestic Organic Rankine Cycle-Based Cogeneration Systems as a Way to Reduce Dust Emissions in Municipal Heating

Advances in Carbon Management Technologies

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