Parametric optimization and thermodynamic performance comparison of single-pressure and dual-pressure evaporation organic Rankine cycles

Li, Jian; Ge, Zhong; Duan, Yuan-Yuan; Yang, Zhen; Liu, Qiang

doi:10.1016/j.apenergy.2018.02.096

Cited by 139 publications

(48 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The selection ranges of optimized cycle parameters are presented in Table . The reasons for the selections of the upper and lower limits of p evap and T 5 can refer to Li et al…”

Section: Methodssupporting

confidence: 86%

“…Dual‐pressure evaporation cycle has a great potential to significantly improve the temperature match effect between heat source fluid and working fluid, and simultaneously reduce the heat source outlet temperature. These advantages have been proven in our previous work for ORC systems using pure fluids . Thus, the dual‐pressure evaporation cycle presents a great potential to further improve the thermodynamic performance of ORC systems using R600a/R601a mixtures driven by heat sources below approximately 160°C.…”

Section: Resultsmentioning

confidence: 99%

“…For the hot water, to maintain in the liquid state, the pressure is 0.5, 1.2, and 1.6 MPa for temperatures of 100°C to 150°C, 151°C to 180°C, and 181°C to 200°C, respectively. The outlet temperature of hot water has no specific limitation …”

Section: Methodsmentioning

confidence: 99%

“…Secondly, the working fluid is set as the saturated vapor (no superheat degree) at the evaporator outlet in most of existing studies on ORC systems using R600a/R601a mixtures. While, our previous work indicated that R600a with a superheated vapor at the evaporator outlet would obtain the optimal system thermodynamic performance, instead of a saturated vapor, for heat source temperatures above the critical temperature of R600a. Thus, for ORC systems using R600a/R601a mixtures, the optimal superheat degree also needs to be quantitatively studied for various heat source conditions, especially for heat source temperatures above the critical temperatures of R600a/R601a mixtures.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Performance analyses and improvement guidelines for organic Rankine cycles using R600a/R601a mixtures driven by heat sources of 100°C to 200°C

Duan

et al. 2018

Int J Energy Res

Self Cite

View full text Add to dashboard Cite

Summary R600a/R601a mixtures are promising to be widely used in organic Rankine cycle (ORC) systems and also can promote the popularization of ORC technology. While, most of existing studies on ORC systems using R600a/R601a mixtures are based on certain heat source temperatures (generally below 150°C) and saturated vapor at the evaporator outlet. Variations in the optimal mixture composition and superheat degree of R600a/R601a mixtures with increasing heat source temperature remain indeterminate thus far, especially for heat sources above 150°C. Suitable approaches to further improve the system thermodynamic performance are also unclear. This study carried out a systematized analysis for subcritical ORC systems using R600a/R601a mixtures driven by heat sources of 100°C to 200°C, based on the first and second law analysis methods. Guidelines for selections of optimal mixture composition and cycle parameters were provided. Characteristics of exergy loss distribution were revealed to point out the crucial process to further improve the system thermodynamic performance. Results show that the effects of critical parameters on the selections of optimal mixture composition and evaporation pressure become remarkable for heat sources above approximately 160°C. A minimum superheat degree is optimal for heat sources below 170°C, whereas the optimal superheat degree may increase with increasing heat source temperature and R600a mass fraction for heat sources above 170°C. Moreover, reducing the exergy losses in the heat absorption process, turbine, and condenser is vital to further increase the heat‐work conversion efficiency for heat sources of approximately 100°C to 160°C, 170°C to 190°C, and 200°C, respectively.

show abstract

“…The selection ranges of optimized cycle parameters are presented in Table . The reasons for the selections of the upper and lower limits of p evap and T 5 can refer to Li et al…”

Section: Methodssupporting

confidence: 86%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Performance analyses and improvement guidelines for organic Rankine cycles using R600a/R601a mixtures driven by heat sources of 100°C to 200°C

Duan

et al. 2018

Int J Energy Res

Self Cite

View full text Add to dashboard Cite

show abstract

“…Different system configurations might dominate various situations . By actively designing the suitable configurations to adapt to the heat source characteristics and improve the heat absorption process, the various performances of the system can be significantly improved . The temperature matching of ORC is important due to multiple waste heat sources in engine.…”

Section: Introductionmentioning

confidence: 99%

How to select regenerative configurations of CO ₂ transcritical Rankine cycle based on the temperature matching analysis

Tian

Liu

et al. 2020

Int J Energy Res

View full text Add to dashboard Cite

Summary CO2 transcritical Rankine cycle is regarded as a potential technology for internal combustion engines waste heat recovery, and its regenerative configurations present great prospect to increase the power output capacity. This paper proposed different regenerator layout configurations based on the temperature matching analysis, including low temperature regenerative transcritical Rankine cycle (LR‐TRC), high temperature regenerative transcritical Rankine cycle (HR‐TRC), dual regenerative transcritical Rankine cycle (DR‐TRC) and split dual regenerative transcritical Rankine cycle (SR‐TRC). Afterward, the thermodynamics, electricity production cost (EPC) and miniaturization performance are implemented. The results show that regenerative configurations have an effect on improving net power output and SR‐TRC obtained optimal value of net power output. For the perspective of economic performance, the greatest value is obtained for HR‐TRC among four regenerative configurations. As for the miniaturization performance, the total heat transfer area increment of LR‐TRC is the lowest. The comparative analysis results offer guidance for selecting optimal regenerative configurations.

show abstract

Heat recovery from hydrothermal carbonization slurry product by coupling processes of flash and organic Rankine cycle: Thermodynamic analysis

et al. 2021

View full text Add to dashboard Cite

Hydrothermal carbonization (HTC) is a promising and effective technology for upgrading the fuel quality of high‐moisture organic wastes. However, a large amount of energy is required to heat the feedstock to high temperature for HTC. Therefore, the maximum waste heat should be recovered to increase the energy efficiency of the HTC process. In this work, a flash‐organic Rankine cycle (FSPG‐ORC) system was coupled after HTC to recover the heat contained in the HTC slurry product. Various operating factors including the flashing temperature, the HTC temperature, the solid‐water ratio (S/W) of the feedstock, and the organic working fluids in the ORC section were studied to obtain their influences on thermodynamic performance of the coupled system. Results indicated that the net power (Wnet) of the FSPG‐ORC system increased from 185.64 to 774.30 kW through the increase of the HTC temperature from 160 to 280°C. In addition, the Wnet and exergy efficiency of the FSPG‐ORC system also increased with increasing the flashing temperature of HTC slurry product. The coupled FSPG‐ORC system converted waste heat to electric energy and increased the energy efficiency of the HTC process.

show abstract

Parametric optimization and thermodynamic performance comparison of single-pressure and dual-pressure evaporation organic Rankine cycles

Cited by 139 publications

References 50 publications

Performance analyses and improvement guidelines for organic Rankine cycles using R600a/R601a mixtures driven by heat sources of 100°C to 200°C

Performance analyses and improvement guidelines for organic Rankine cycles using R600a/R601a mixtures driven by heat sources of 100°C to 200°C

How to select regenerative configurations of CO ₂ transcritical Rankine cycle based on the temperature matching analysis

Heat recovery from hydrothermal carbonization slurry product by coupling processes of flash and organic Rankine cycle: Thermodynamic analysis

Contact Info

Product

Resources

About

Parametric optimization and thermodynamic performance comparison of single-pressure and dual-pressure evaporation organic Rankine cycles

Cited by 139 publications

References 50 publications

Performance analyses and improvement guidelines for organic Rankine cycles using R600a/R601a mixtures driven by heat sources of 100°C to 200°C

Performance analyses and improvement guidelines for organic Rankine cycles using R600a/R601a mixtures driven by heat sources of 100°C to 200°C

How to select regenerative configurations of CO 2 transcritical Rankine cycle based on the temperature matching analysis

Heat recovery from hydrothermal carbonization slurry product by coupling processes of flash and organic Rankine cycle: Thermodynamic analysis

Contact Info

Product

Resources

About

How to select regenerative configurations of CO ₂ transcritical Rankine cycle based on the temperature matching analysis