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A solar linear concentrator with a fixed reflector and a moving focus is under development. The main objective of the research is to develop a low – cost, roof integrated, solar collector suited for mid – range thermal applications, such as absorption cooling and industrial heat (90 – 200 oC). This range of temperatures could be achieved with low concentration factors (9 15 suns). This range of radiation concentration is also well suited for the development of Combined Solar Heat and Power (CHP) systems integrating PV and thermal converters in the same unit [1]. Recently, this kind of application has gained much attention from the solar energy industry with several interesting development projects from both the industry and the academy [2]. The proposed solution is based on a static reflector with a moving linear focus (Figure 1). The basic geometric concepts were developed in the ‘70s [3] but the product development never passed beyond the experimental prototype stage. Nevertheless, a detailed ray-tracing modelling of the reflector behaviour shows clearly that it is possible to achieve a high optical efficiency into the target concentration range. Although the reflector is static, the sun path should be tracked by the receiver to be kept on the reflector focus. Therefore a precise and inexpensive tracking control system is of fundamental importance for a successful development of the collector.

Low-cost orientation system for a concentrating solar collector with static reflector and tracking receiver