Solar Thermal Power Plants - Renewable Energy: Technology, Economics and Environment - page 185

Fig. 5.8 Open volumetric air receiver according to the Phoebus principle (see /5-8/)
Closed (pressurised) air receivers. Receivers of solar tower power plants may
also be designed as closed pressurised receivers. The aperture of such receivers is
closed by a fused quartz window, so that the working medium air may be heated
under overpressure and may, for instance, be directly transferred to the combustor
of a gas turbine. To date, for example, a group of closed air receivers of a heat
capacity of up to 1,000 kW has been tested at 15 bar. The obtained air outlet tem-
peratures are slightly above 1,000 °C /5-9/. The individual receivers have been
designed and interconnected according to their different thermal strain. For com-
mercial applications several module groups may be added (Fig. 5.9).
Fig. 5.9 Closed volumetric air receiver cluster equipped with secondary concentrators (see
/5-9/)