Experimental study of a 1 kw organic Rankine cycle with a zeotropic mixture of R245fa/R134a

Abadi, Gholamreza Bamorovat; Yun, Eunkoo; Kim, Kyung Chun

doi:10.1016/j.energy.2015.10.092

Cited by 72 publications

(10 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The collected experimental data used in the scroll expander simulation model can be found in Table 4 Collected experimental data using the selected scroll expander and R245fa in ORC [17,19,37 n. a n. a n. a n. a n. a 6.1 77.5 6 [19] 89. 7 38.4 n. a 0.052 9.95 4.58 84.9 7 [37] 75 n. a 3600 0.…”

Section: Description Of the Scroll Expander Modelmentioning

confidence: 99%

Parametric study for small scale engine coolant and exhaust heat recovery system using different Organic Rankine cycle layouts

Roskilly

et al. 2017

Applied Thermal Engineering

View full text Add to dashboard Cite

show abstract

Section: Description Of the Scroll Expander Modelmentioning

confidence: 99%

Parametric study for small scale engine coolant and exhaust heat recovery system using different Organic Rankine cycle layouts

Roskilly

et al. 2017

Applied Thermal Engineering

View full text Add to dashboard Cite

show abstract

“…In order to achieve a better heat transfer between the heat source and the working fluid, zeotropic mixture was proposed to be used due to its temperature slide during the phase change process. Pang et al (2017) and Abadi, Yun, and Kim (2015) investigated the ORC with zeotropic mixture. Their results indicate that the performance with zeotropic mixture is not always better than that with pure working fluid.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of an Organic Rankine cycle system using an oil-free scroll expander for low grade heat recovery

Liang

2021

International Journal of Green Energy

View full text Add to dashboard Cite

Organic Rankine cycle (ORC) has become a promising energy harvesting technique to recover thermal energy from low-grade heat sources. In this study, a lab-scale ORC system has been designed, constructed, and tested to investigate the potential of utilizing the heat from hot water, which is used to simulate the jacket water of internal combustion engines. The ORC system employs an oil-free scroll expander with R245fa as working fluid. A wide range of operating conditions has been studied by adjusting the pump frequency, the load and the mass flow rate of cooling water. Effect of the superheat degree at the expander inlet was investigated and the results showed that the ORC system presented better performance with superheat of 0. It is concluded that the system should be controlled to maintain the least possible superheat degree to obtain higher power output and better efficiency. The maximum electric power output and the maximum thermal efficiency are 0.61 kW and 4.09%, respectively, when the heat source is 96.8°C. The power consumed by the pump ranges from 0.07 to 0.18 kW, which accounts for 22 to 39% of the power output of ORC.

show abstract

“…Most studies in literature refer to scroll compressors converted to expander, while in some cases original manufacturer machines or prototypes were adopted; for example, Abadi et. al [5], investigated a 1 kW scroll expander developed by the company Air Squared, adopting a zeotropic mixture of R245fa and R134a as working fluid; they achieved a power output close to 1.2 kW with an expansion ratio of 3.3, with a maximum net cycle efficiency close to 6 %. Ziviani et al [6] tested a 5 kW open-drive scroll expander with R245fa with a hot source temperature equal to 85 °C and 110 °C, varying the ORC mass flow rate; they achieved the maximum power of 3.75 kW at 2500 rpm, with an isentropic efficiency equal to 55 %.…”

Section: Context and State-of-the-artmentioning

confidence: 99%

Experimental analysis of a micro-ORC driven by piston expander for low-grade heat recovery

Bianchi

Branchini

Casari

et al. 2019

Applied Thermal Engineering

View full text Add to dashboard Cite

In this paper, a full experimental characterization of a micro-scale ORC system is presented. The facility under investigation is driven by a piston expander prototype, made of three cylinders arranged radially around the drive shaft. The system is rated for a thermal input around 30 kW, being suitable for residential, tertiary sector or small industry applications. It is conceived for exploiting low temperature heat sources, such as solar collectors, biomass boilers, geothermal energy or waste heat streams. The facility was provided with an electric boiler as heat source, which warms water up to 90 °C, and cold water at ambient temperature as heat sink. A test campaign was performed varying the hot source temperature and the organic fluid feed pump velocity, in order to characterize the system behavior at different off-design working conditions. The electric consumption of the ORC feed pump was measured, in order to quantify the actual impact of the auxiliaries on the overall efficiency. Moreover, the number of electric loads connected to the generator was varied, changing the equivalent phase impedance value, for evaluating the effect on the expander rotating speed and power output.The experimental analysis demonstrated that small reciprocating expander is suitable for exploiting low enthalpy heat sources, with quite good performances compared to other architectures like scroll and screw expanders, more applied within low temperature sources. The results show that the gross electric power output varied between 250 W and 1150 W, depending on the expander speed and on the number of electric loads activated. The expander total efficiency showed a barely constant trend around 40 %. The pump total efficiency varied between 10 % and 20 %, increasing with the pump rotational speed. The maximum ORC gross and net efficiency were 4.5 % and 2.2 % respectively, confirming that the auxiliaries impact cannot be considered negligible in such type of systems.

show abstract

Experimental study of a 1 kw organic Rankine cycle with a zeotropic mixture of R245fa/R134a

Cited by 72 publications

References 24 publications

Parametric study for small scale engine coolant and exhaust heat recovery system using different Organic Rankine cycle layouts

Parametric study for small scale engine coolant and exhaust heat recovery system using different Organic Rankine cycle layouts

Experimental investigation of an Organic Rankine cycle system using an oil-free scroll expander for low grade heat recovery

Experimental analysis of a micro-ORC driven by piston expander for low-grade heat recovery

Contact Info

Product

Resources

About