Is it possible to achieve more than 15 % of thermal efficiency (not Carnot)for an ORC working with Waste heat (as source of heat)?
Dear Easwaran,
I guess you mean electric efficiency (electric power provided divided by thermal power as input)? That depends on the temperature of your heat. According to their webpage, the Orchid 1000 from enertime is providing 870 kWel (net) at 5600 kW thermal input (with a temperature of 200 °C), but with no further heat recovery. That gives 15.5% of net electric efficiency.
Best regards
Andreas
It depends on the temperature niveau of the waste heat, and in combination with that on the niveau of the ambient temperature.
With \eta = 1 - T_low/T_high and T_low = 300 K for example, you require a T_high of 356 K or about 84 °C as lowest Carnot limit. In practice, due to omnipresent losses, I'd guess that you will need some 150°C or more. But it will depend heavily on the quality of the realized cycle.
Cheers,
Petra
If you are able to increase your cycle temperature then you can increase the net efficiency of your ORC. Tempe above 250 C can improve efficiency up to 20%
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