Fluid selection of Organic Rankine Cycle for low-temperature waste heat recovery based on thermal optimization

Performance characteristics of a 200-kW organic Rankine cycle system in a steel processing plant

“…Generally, the working fluid selection and optimization of the boiler saturation temperature for some thermodynamic quantities, like cycle efficiency and heat source recovery factor are main problems for designing ORC [9]. This is because those selections can lead to opposite design choices in the achievement of maximum power output [10].…”

Comparative study of waste heat steam SRC, ORC and S-ORC power generation systems in medium-low temperature

“…This is because the exergy efficiency of the ORC is very high at low temperature while SRC's exergy efficiency is low. With the increase of24 temperature, the advantages of SRC in the high temperature section can be reflected.Fig.16. 150-350 C heat S-ORC maximum exergy efficiency chart.…”

“…Therefore, dry working fluids and adiabatic working fluid are often used as working fluids of organic Rankine cycles[23].The properties of the organic working fluid have a significant effect on the system performance. Domestic and foreign scholars have carried out extensive researches[24][25][26][27] on the selection of ORC working fluid and summarized the principles of ORC working fluids selection[28][29][30][31][32].The critical temperature should be slightly higher than the maximum temperature in the cycle to avoid many potential problems caused by a trans-critical cycle. The condensation pressure should not be too low and it is better to keep a positive pressure to prevent the outside air from penetrating and affecting the performance of the cycle.  The best selection is dry working fluid, in the T-S diagram of saturated vapor line, dS/dT > 0.…”

Thermal analysis of a Phase Change Material for a Solar Organic Rankine Cycle

“…1. Since the ORC requires a relatively low-temperature heat source [14], a medium-temperature solar collector can be employed for this purpose. Having a constant temperature solar heat source is pretty challenging, thus an integrated system is required.…”