Considerations regarding the practical implementation of the heliothermic actuator in the form of flat spiral spring

In this paper is presented the authors concern regarding the development of solutions in the field of heliothermic actuators achieved based on the solid heat medium. One of the research directions has led to an actuator with bimetallic band in the form of flat spiral spring and heat conductive fins. In the end of the paper are presented main conclusions regarding the tests made on the actuator with the bimetallic band immersed in various mediums.