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Session: Poster session & Sponsor Exhibition
Session starts: Monday 07 October, 14:00

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Piotr Kolasiński (Wroclaw University of Technology, Institute of Heat Engineering and Fluid Mechanics)
Zbigniew Gnutek (Wroclaw University of Technology, Institute of Heat Engineering and Fluid Mechanics)

Abstract:
The ORC systems used for waste heat recovery are mainly powered from industrial waste heat sources. The industrial waste heat sources are characterized by a set of specific characteristics resulting mainly from their nature. Sources with the large thermal power and steady output characteristics can be used directly for ORC system powering. But, in the industry, an large group of dynamic waste heat sources exists. Such sources often have large thermal potential but their appearance is periodic. They appearing in all industrial energy conversion processes, but practically are not used. The commonness and large potential of such sources are interesting to consider their for the ORC system powering. In case of standard ORC systems dynamic working conditions are inadvisable. The design of special ORC system that can be adaptive to the heat source characteristic fluctuations would be very difficult and expensive as the special heat exchangers, expander and proper control system have to be worked out. Therefore interesting, in authors opinion, is to carry out the theoretical analysis and to find out the possible methods of dynamic heat source characteristic modulation. Application of modulation method will result in steady heat source characteristic which will be acceptable for the standard ORC system powering. This paper presents a theoretical study on a different methods of the dynamic heat source characteristic modulation. The main objectives of this work were therefore proposals of modulation methods and their comparative analysis. Moreover the proposals of configuration of the ORC power systems powered by dynamic heat sources are presented here together with a set of parameters useful for the system work quality assessment. The analysis presented in this paper indicates that dynamic characteristic modulation can be an option for application of the standard ORC system to the dynamic heat source.