STS-Med is exploring many technological options for each of the subsystem needed to implement a solar polygenerative approach. Solar energy can be collected by simple flat receivers, evacuated pipes, or by more sophisticated tracking systems mutuated from the utility-sized projects. As the quality of the collected thermal energy is a crucial point for the effective operation of the whole system, high performance concentrating solar collector, both parabolic trough and linear fresnel, have been chosen for the demo plants. In particular, an original linear fresnel collector design suitable for rooftop installation has been brought to industrial maturity and further sophysticated by the hybridization of mirrors with PV panels.
Plant design has been built around the storage module, which is at the real hearth of solar polygeneration. Molten salts technology has been downsized for the first time to be appliable in small-medium plants, offering a very compact, unexpensive and flexible thermal energy storage.
Both Li-Br and water-ammonia cycles have been taken into consideration for the generation of cold, as the main service required in the regions of interest. While in general the choice is depending upon the size and the operating temperature, a double effect Li-Br chiller seems the best options for its high performance if coupled with a concentrating collector working at more than 200°C.
Different options have been considered for the generation of electricy. In the different demo plants it is possible to experience hybridization with PV, micro steam turbines and organic rankine cycle turbines. Because of that, the pilot system are a valid showcase of a combination of technologies that can be applied in mid sized plants (100 – 300 kWe) able to cover the full demand of villages and urban districts.

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