Matematični model za simulacijo in optimizacijo procesov v parno-kompresijskih hladilnih sistemih : doktorsko delo

slovenian

doktorska dela

2021

capillary tubes   dissertations   mathematical optimization   numerical modeling   refrigerant flow   refrigeration   vapor-compression systems

Univerza v Ljubljani, Fakulteta za strojništvo
(Obvezni izvod spletne publikacije)

Existing capillary tube models rely on general friction factor correlations, which were not designed for the flow of refrigerant through these tubes. Additionally, it is unknown whether the two-phase flow in them is homo- or heterogeneous. This work presents the development of an improved friction factor correlation, which was implemented in a numerical capillary tube model. The accuracy of the latter increased by (plus-minus)1,3 % as a result of this. A visualization of the flow was also performed. It showed that the flow is a predominantly heterogeneous plug flow. In addition to the performed experiments, an algorithm for the optimization of capillary tube-suction line heat exchangers was also developed. Comparison of different optimization algorithms showed that evolutionary algorithms performed most favourably.

15.05.2023