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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 Rogala (Wroclaw University of Technology, Institute of Heat Engineering and Fluid Mechanics)

Abstract:
One of the problems encountered while designing the ORC systems is the proper selection of the heat exchangers which depends on many factors. Among these factors are: characteristics of the heat source supplying the system, required parameters, type of working medium and auxiliary mediums of the system. Frequently the shell-tube and plate heat exchangers are mainly used in ORC systems. They can be characterized by low ratio of heat flow to heat transfer surface. It influences the size of the heat exchangers, and furthermore, the amount of the material used and the whole installation expense. Interesting alternative for the currently applied heat exchangers might be Rosenblad’s Spiral Heat Exchangers (SHE). What makes this construction so particular is the relatively high ratio of the heat flow to the heat transfer surface. The new modified calculation method dedicated to the Rosenblad’s SHE is presented in this article. The formulated method was applied to the calculations of the Rosenblad’s SHE, which serves as evaporator in the prototype ORC system. The results of these calculations are presented herein. The results of the analysis show that the Rosenblad’s SHE might be an interesting alternative for the other types of the heat exchangers applied presently to the ORC systems. Their application creates a possibility of the reduction of size of the installation, as well as, its expenses.