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Projects / Programmes source: ARIS

Determination of morphological parameters for optimization of heat exchanger surfaces

Research activity

Code Science Field Subfield
2.13.02  Engineering sciences and technologies  Process engineering  Transmissibility in solids and fluids 

Code Science Field
T140  Technological sciences  Energy research 
Keywords
heat transfer, fluid mechanics, heat exchangers, morphology optimization, porous media
Evaluation (rules)
source: COBISS
Researchers (2)
no. Code Name and surname Research area Role Period No. of publicationsNo. of publications
1.  15816  PhD Andrej Horvat  Energy engineering  Researcher  2003 - 2004  52 
2.  02852  PhD Borut Mavko  Energy engineering  Head  2003 - 2004  930 
Organisations (1)
no. Code Research organisation City Registration number No. of publicationsNo. of publications
1.  0106  Jožef Stefan Institute  Ljubljana  5051606000  90,664 
Abstract
Despite the crucial role of heat exchangers in industrial and especially in nuclear installations, their design still largely relies on empirical knowledge. The objective of the proposed project is to develop an optimization procedure for the heat exchanger morphology, using hierarchic modeling of the coolant thermal hydraulics as well as thermal behavior of the structure. The idea is to consider the heat transfering structure as a porous media using the Volume Averaging Technique (VAT). This generalization will allow us to unify the heat transfer calculation techniques for different kind of heat exchangers and their structures, because the case-specific geometrical arrangements, material properties and fluid flow conditions enter the unified calculation algorithm only as a series of precalculated coefficients. In the project, the CFD code CFX 4.3 will be used for detailed three-dimensional study of local thermo-hydraulic behavior in heat exchangers. Based on the calculated local velocity and temperature fields, the case-dependent coefficients (local drag and heat transfer coefficients) will be determined and included into the integral thermo-hydraulic code. Due to implementation of the local drag and heat transfer coefficients as input parameters, the integral thermo-hydraulic code will be fast running and able to provide enough results for a parametric study. To determine optimal morphological parameters for a maximum thermal effectiveness, an algorithem based on the Optimal Statistical Estimator (OSE) will be used. Further, examination of heat transfer parametric function will identify the most successful heat exchanger geometry and retroactively relate peaks in heat transfer to complex thermo-hydraulic phenomena.
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