Please use this identifier to cite or link to this item:

Title: Optimization of Heat Transfer Systems and Use of the Environmental Exergy Potential - Application to Compact Heat Exchangers and Heat Pumps
Authors: Canhoto, Paulo
Advisors: Heitor Reis, António
Keywords: Heat and Mass Transfer
Heat sinks
Constructal Theory
Issue Date: 17-May-2012
Publisher: IIFA - Instituto de Investigação e Formação Avançada, Universidade de Évora
Citation: Paulo Canhoto, Optimization of Heat Transfer Systems and Use of the Environmental Exergy Potential - Application to Compact Heat Exchangers and Heat Pumps, PhD Thesis, University of Evora, 2012.
Abstract: In this thesis, the optimization of forced convection heat sinks and groundwater-source heat pumps is addressed with the purpose of improving energy efficiency. Parallel ducts heat sinks are considered under constrained (fixed) pressure drop, pumping power and heat transfer rate. The intersection-of-asymptotes method is employed together with numerical simulations and relationships for determining optimum hydraulic diameter are put forward. An optimal design emerges under fixed heat transfer rate, which matches that found through the joint minimization of pressure drop and pumping power. With regard to heat pumps optimization, the relation between coefficient-of-performance and air-to-ground exergy potential is established, showing that energy saving as compared to air-to-air systems depends on the square root of that potential. The exergy potential in the Evora region is estimated, and exergy analysis of groundwater-source systems helps identifying distinct conditions of operation: maximum/null net exergy output and best trade-off between environmental exergy utilization and power input.
Type: doctoralThesis
Appears in Collections:CGE - Formação Avançada - Teses de Doutoramento

Files in This Item:

File Description SizeFormat
FacebookTwitterDeliciousLinkedInDiggGoogle BookmarksMySpaceOrkut
Formato BibTex mendeley Endnote Logotipo do DeGóis 

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.


Dspace Dspace
DSpace Software, version 1.6.2 Copyright © 2002-2008 MIT and Hewlett-Packard - Feedback
UEvora B-On Curriculum DeGois