Table 6.

Author keywords with the highest number of occurrences on "solar AND organic Rankine cycle".

Cluster Colour	Observable Keywords	Number of occurrences
Red	Solar orc, solar organic Rankine cycle, exergy analysis, solar desalination, solar thermal energy, parabolic through solar collect, cogeneration, reverse osmosis, exergoeconomic, desalination	121
Blue	Power generation, thermal energy storage, solar collector, exergy efficiency, absorption chiller, trigeneration, parabolic through solar collect, organic Rankine cycle (orc)	108
Green	Efficiency, parabolic through collector, orc, optimization, energy, biomass, solar, exergy, concentrating solar power	228
Yellow	Organic Rankine cycle, renewable energy, solar power, concentrated solar power, solar collectors	244
Purple	Solar energy	103