An innovative small-scale two-stage axial turbine for low-temperature organic Rankine cycle

2017 ◽  
Vol 144 ◽  
pp. 18-33 ◽  
Author(s):  
Ayad M. Al Jubori ◽  
Raya Al-Dadah ◽  
Saad Mahmoud
Keyword(s):  
Low Temperature ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Small Scale ◽  
Two Stage ◽  
Axial Turbine

Experimental testing of a small-scale two stage Organic Rankine Cycle engine operating at low temperature

Energy ◽  
2017 ◽  
Vol 141 ◽  
pp. 869-879 ◽  
Author(s):  
Erika Ntavou ◽  
George Kosmadakis ◽  
Dimitris Manolakos ◽  
George Papadakis ◽  
Dimitris Papantonis
Keyword(s):  
Low Temperature ◽  
Experimental Testing ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Small Scale ◽  
Two Stage

Three dimensional optimization of small-scale axial turbine for low temperature heat source driven organic Rankine cycle

2017 ◽  
Vol 133 ◽  
pp. 411-426 ◽  
Author(s):  
Ayad Al Jubori ◽  
Raya K. Al-Dadah ◽  
Saad Mahmoud ◽  
A.S. Bahr Ennil ◽  
Kiyarash Rahbar
Keyword(s):  
Low Temperature ◽  
Heat Source ◽  
Three Dimensional ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Small Scale ◽  
Axial Turbine ◽  
Temperature Heat ◽  
Dimensional Optimization

scholarly journals Investigation on a small-scale pumpless Organic Rankine Cycle (ORC) system driven by the low temperature heat source

2017 ◽  
Vol 195 ◽  
pp. 478-486 ◽  
Author(s):  
L. Jiang ◽  
H.T. Lu ◽  
L.W. Wang ◽  
P. Gao ◽  
F.Q. Zhu ◽  
...  
Keyword(s):  
Low Temperature ◽  
Heat Source ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Small Scale ◽  
Temperature Heat

Investigation of the Combination of Bypass System and OPC Logic for ORC System Stability Under Load Reduction Disturbance

2014 ◽  
Author(s):  
Pan Zhao ◽  
Mingkun Wang ◽  
Jiangfeng Wang ◽  
Yiping Dai
Keyword(s):  
Control System ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
System Stability ◽  
Small Scale ◽  
Low Grade ◽  
Load Reduction ◽  
Drum Boiler ◽  
Axial Turbine ◽  
Unit Model

Organic Rankine cycle (ORC) is recognized as a promising technology for converting the energy from low grade heat sources into electricity. From a general perspective, the ORC system mainly operates in island mode and also has a small scale power capacity. When this type of system sustains the disturbance of load reduction, the overpressure protection in drum boiler and overspeed protection in axial turbine are the two big challenges for ORC system’s stability. In the present study, the configuration type by combining the bypass system and overspeed protection control (OPC) logic is proposed in ORC system for solving these problems. Firstly, the ORC unit model consisting of the drum boiler, boiler control system, axial turbine, bypass system, turbine control system and OPC logic is established. Then, the drawback and improvements of current OPC logic in China are carried out. Finally, the simulation of this configuration type of ORC system is investigated under load reduction disturbance. The results show that the proposed configuration of ORC system has excellent performance in purpose of power system stability. The axial turbine in the simulation model operates in constant pressure mode.

scholarly journals Two-Stage Radial Turbine for a Small Waste Heat Recovery Organic Rankine Cycle (ORC) Plant

Energies ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1054
Author(s):  
Ambra Giovannelli ◽  
Erika Maria Archilei ◽  
Coriolano Salvini
Keyword(s):  
Waste Heat ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Plant Performance ◽  
Sensitivity Analyses ◽  
Small Scale ◽  
Thermodynamic Efficiency ◽  
Two Stage ◽  
Economic Point ◽  
Heat Potential

Looking at the waste heat potential made available by industry, it can be noted that there are many sectors where small scale (< 100 kWe) organic Rankine cycle (ORC) plants could be applied to improve the energy efficiency. Such plants are quite challenging from the techno-economic point of view: the temperature of the primary heat source poses a low cutoff to the system thermodynamic efficiency. Therefore, high-performance components are needed, but, at the same time, they have to be at low cost as possible to assure a reasonable payback time. In this paper, the design of a two-stage radial in-flow turbine for small ORC industrial plants is presented. Compared to commonly applied mono-stage expanders (both volumetric and dynamic), this novel turbine enables plants to exploit higher pressure ratios than conventional plants. Thus, the theoretical limit to the cycle efficiency is enhanced with undoubted benefits on the overall ORC plant performance. The design process involved 1D/2D models as well as 3D Computational Fluid Dynamic ones. After the design of the preliminary configuration, sensitivity analyses were carried out varying the most relevant geometric parameters for design performance improvement. Thereafter, the stages were both analyzed in off-design conditions giving their performance maps. Moreover, a stage stacking procedure was applied to obtain the overall turbine behavior.

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