Design of an ORC system operating with solar heat and producing sanitary hot water

Elias Bou Lawz Ksayer (1)

1 CEP/Paris

Organic Rankine Cycle (ORC) is useful to generate electricity from low temperature sources such solar heat (< 120°C). An ORC system, working with R-245a, is presented and analyzed. The system provides the required electric power and the required hot sanitary water of a typical dwelling during one day (24 hours). The system operates between a cold source of 25°C and a hot source: water at 120°C in solar hours, when solar flux is available, and between a cold source of 15°C and a hot source: water at 98°C coming from the accumulation tank in no-solar hours (morning, evening, and night). The maximum generated electric power is 2000 W, and the used daily hot water is 200 l at 60°C. The required surface of the solar heater is 100 m 2 assuming 8 solar hours per day and a mean solar flux of 400 W/m 2. The advantages of the ORC system are the electricity generation, the hot water production and the low cost compared to photovoltaic electric power generation.

Mots clés: Electric power; Electricity generation; Generate electricity; Hot water; Hot-water production; Low costs; Low temperatures; ORC system; Organic Rankine cycles; Solar flux; Solar heat; Solar heater

Domaines: Energétique

Elias Bou Lawz Ksayer. Design of an ORC system operating with solar heat and producing sanitary hot water. Energy Procedia, 2011, 6, pp.389-395. ⟨10.1016/j.egypro.2011.05.045⟩. ⟨hal-00768446⟩