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Tesis sobre el tema "Heat exchangers"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 9 de junio de 2025

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1

Kennedy, Ian James. "Investigation of heat exchanger inclination in forced-draught air-cooled heat exchangers." Thesis, Queen's University Belfast, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.601789.

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In some industrial air-cooled heat exchangers, such as those in the generating set industry, the flow must turn through 90° after exiting the heat exchanger. In such arrangements, the plenum depths are typically very shallow. Furthermore., the axial fan often operates in the mixed-flow region of the fan characteristic, due to the restrictive nature of the system. These two factors lead to a reduction in the thermal performance of the system. The purpose of this study was to investigate the effect on thermal performance of inclining the heat exchanger relative to the axial fan. It was also impo

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2

Watkins, Rhodri Evan. "Variable Volume Heat Exchangers." Thesis, University of Bristol, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.521071.

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3

Bartuli, Erik. "Optimization of Heat Transfer Surfaces of Heat Exchangers." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-401602.

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Disertační práce je zaměřena na kovové a polymerní výměníky tepla. Hlavním předmětem zkoumání je optimalizace teplosměnných ploch za účelem zvýšení účinnosti výměníku tepla. Tyto cíle byly dosaženy experimentálně a numericky pomocí modelování v ANSYS. Na základě dosažených výsledků byla rozpracována technologie křížového navíjení polymerních výměníků z dutých vláken. Experimentální zařízení původně určené pro navíjení tlakových nádrží bylo modifikované pro automatizovanou výrobu polymerních výměníků z dutých vláken, ježto může být použita při jejich masové výrobě. Tato práce se také zabývala v

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4

Hensley, Joshua L. "Direct contact heat exchanger development." Diss., Columbia, Mo. : University of Missouri-Columbia, 2007. http://hdl.handle.net/10355/6002.

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Thesis (Ph. D.)--University of Missouri-Columbia, 2007.<br>The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on March 13, 2008) Vita. Includes bibliographical references.

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5

Keen, D. J. "Combined convection in heat exchangers." Thesis, University of Leeds, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.235252.

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6

Henry, M. P. "Design methodology : Regenerative heat exchangers." Thesis, University of York, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.379493.

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7

Li, Ming. "An experimental and theoretical study of fluidelastic instability in cross flow multi-span heat exchanger tube arrays /." *McMaster only, 1997.

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8

Van, Aken G. J. "Transient modelling of finned tube heat exchangers /." Title page, contents, abstract and summary only, 1993. http://web4.library.adelaide.edu.au/theses/09ENS/09ensv217.pdf.

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9

Boulares, Jihed. "Numerical and experimental study of the performance of a drop-shaped pin fin heat exchanger." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03Jun%5FBoulares.pdf.

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Thesis (Mechanical Engineer and M.S. in Mechanical Engineering)--Naval Postgraduate School, June 2003.<br>Thesis advisor(s): Ashok Gopinath. Includes bibliographical references (p. 73-74). Also available online.

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10

Adams, Juan Carlos. "Advanced heat transfer surfaces for gas turbine heat exchangers." Thesis, University of Oxford, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.534221.

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11

Nguyen, Clayton Ma. "Heat transfer coefficients of particulate in tubular heat exchangers." Thesis, Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/53960.

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This experimental study explores the heat transfer from heated bare and finned tubular surfaces to particulates in packed bed cross flow. The results from this experiment will be used to help select the type of particulates that will be used. Additionally, these results will assist in estimating heat transfer in prototype and commercial particle to fluid heat exchangers (PFHX). This research is part of larger effort in the use of particulates in concentrating solar power technology. These solid particles are heated by concentrated sunlight to very high temperatures at which they are a suitable

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12

Soler, Fossas Joan. "Modelling of Multistream LNG Heat Exchangers." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for energi- og prosessteknikk, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-14328.

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The main goal of this thesis is to find out if a liquefied natural gas multistream heat exchanger numerical model is achievable. This should include several features usually neglected in nowadays available heat exchanger models, such as flow maldistribution, changes in fluid properties and heat exchanger dynamic behaviour. In order to accomplish that objective a simpler case is modelled. Efforts are put in achieving numerical stability.A counter flow natural gas and mixed refrigerant heat exchanger is modelled. Some important characteristics of the obtained model are: (1) it allows a dynamic s

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13

Marhoon, Fatema Salman. "Heat Exchangers Used in Refrigeration Circuits." Thesis, University of Manchester, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.502999.

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14

Douch, Nicholas. "Air side fouling of heat exchangers." Thesis, University of Brighton, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.397850.

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15

Lawton, Steven. "Flow maldistribution in compact heat exchangers." Thesis, University of Leeds, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.443517.

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16

COSTA, CARLOS EDUARDO SANTOS MOREIRA DA. "COSTS AND IRREVERSIBILITY IN HEAT EXCHANGERS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1986. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=20517@1.

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COMISSÃO NACIONAL DE ENERGIA NUCLEAR<br>Da segunda lei da termodinâmica, os conceitos de disponibilidade e irreversibilidade são aplicados à trocadores de calor. Equações relacionando a irreversibilidade com a efetividade de trocador de calor são desenvolvidas e aplicadas à vários casos. Relações entre o decréscimo de irreversibilidade e custos operacionais são também estabelecidos. Embora seja comumente dito que o trocador de calor em contra-correntes é menos irreversível que o trocador de calor em correntes paralelas, o presente trabalho mostra que isto não é sempre verdadeiro. Um critério m

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17

Huzayyin, Omar A. "Computational Modeling of Convective Heat Transfer in Compact and Enhanced Heat Exchangers." University of Cincinnati / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1313754781.

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18

Forinash, David Michael. "Novel air-coupled heat exchangers for waste heat-driven absorption heat pumps." Thesis, Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/53897.

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A detailed investigation of novel air-coupled absorbers for use in a diesel engine exhaust-driven ammonia-water absorption system operating in extreme ambient conditions was conducted. Electrically driven vapor-compression systems are under scrutiny due to the environmental impact of synthetic refrigerants and the exacerbation of electric utility loads during peak demand periods. One alternative to vapor-compression systems is the absorption heat pump that uses environmentally benign working fluids and can be driven by a variety of heat sources, including waste heat and solar thermal processes

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19

Arsenyeva, O. P. "The hydraulic resistance in the small-scale pillow-plate heat exchangers." Thesis, Національний університет "Львівська політехніка", 2019. http://repository.kpi.kharkov.ua/handle/KhPI-Press/48523.

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The Pillow-Plate Heat Exchangers (PPHEs) are rated as innovative type of heat transfer equipment. The present paper gives the information about the research made in Paderborn University aimed to investigate the heat transfer and pressure drop in the channels of the small-scale PPHE.

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20

Al-Hindi, Mahmoud. "Operating strategies for heat exchangers and networks of heat exchangers subject to fouling and variable inlet conditions." Thesis, Imperial College London, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.321935.

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21

Wu, Siu-kin. "Corrosion and fouling in heat exchangers cooled by sea water from Hong Kong harbour /." Hong Kong : University of Hong Kong, 1987. http://sunzi.lib.hku.hk/hkuto/record.jsp?B12335472.

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22

Da, Riva Enrico. "Two-phase Heat Transfer in Minichannel Heat Exchangers: Heat Pump Applications, Design, Modelling." Doctoral thesis, Università degli studi di Padova, 2009. http://hdl.handle.net/11577/3426130.

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Refrigerant charge minimization is one of the most important targets for heating and air conditioning applications when using natural refrigerants like hydrocarbons or ammonia to cope with the new environmental challenges. Some applications of minichannels for charge minimization in heat pumps are presented and discussed in this thesis. The design of an innovative condenser, an evaporator and an internal heat exchanger is presented. These devices are shell-and-tube heat exchangers using 2 mm i.d. minichannels and realized for the use with propane. Computational procedures based on empirical

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23

Acuña, José. "Improvements of U-pipe Borehole Heat Exchangers." Licentiate thesis, KTH, Applied Thermodynamics and Refrigeration, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-12749.

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<p>The sales of Ground Source Heat Pumps in Sweden and many other countries are having a rapid growth in the last decade. Today, there are approximately 360 000 systems installed in Sweden, with a growing rate of about 30 000 installations per year. The most common way to exchange heat with the bedrock in ground source heat pump applications is circulating a secondary fluid through a Borehole Heat Exchanger (BHE), a closed loop in a vertical borehole. The fluid transports the heat from the ground to a certain heating and/or cooling application. A fluid with one degree higher or lower temperatu

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24

Maltson, John D. "The performance of rippled fin heat exchangers." Thesis, Coventry University, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.276096.

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25

Erol, Selcuk. "Near Field Investigation of Borehole Heat Exchangers." Doctoral thesis, Universite Libre de Bruxelles, 2015. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/221739.

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As an alternative and renewable energy source, the shallow geothermal energy evolving as one of the most popular energy source due to its easy accessibility and availability worldwide, and the ground source heat pump (GSHP) systems are the most frequent applications for extracting the energy from the shallow subsurface. As the heat extraction capacity of the GSHP system applications arises, the design of the borehole heat exchangers (BHE), which is the connected part of the system in the ground, become more important. The backfilling materials of BHEs, particularly, the grout material must pro

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26

Tsopanos, Sozon. "Micro Heat Exchangers by Selective Laser Melting." Thesis, University of Liverpool, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.507633.

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Selective Laser Melting (SLM), a layer-based Solid Freeform Fabrication (SFF) process, was used to fabricate micro cross-flow heat exchangers from 316L stainless steel, bronze (Cu 90%, Sn 10%) and Inconel 718 powder. Their mechanical and thermal properties were determined using solid blocks of SLM material prior to the fabrication of the micro cross flow heat exchangers. Initially the process parameters for the fabrication of high density (>97%) parts for the different materials were defined. The mechanical and thermal properties of SLM parts were then measured. The tensile test results exhibi

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27

Rae, George J. "Flow induced acoustic resonances in heat exchangers." Thesis, Robert Gordon University, 1986. http://hdl.handle.net/10059/608.

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This thesis describes an investigation into the acoustic phenomenon in in-line tubular heat exchangers subjected to cross flow. The flow through such a heat exchanger can result in the production of very high noise levels, which occur as a result of the excitation of an acoustic standing wave in the cavity between the tube rows. This acoustic vibration can occur in large and small heat exchangers alike, resulting in drastically impared performance and working life. The phenomenon associated with such vibration is poorly understood and considerable anomalies still exist in published literature.

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28

Evans, David John. "Non-linear modelling of regenerative heat exchangers." Thesis, University of York, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.338556.

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29

Murray, James Mason. "Fine tube technology for advanced heat exchangers." Thesis, University of Bristol, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.299326.

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30

Gotham, Simon Martyn. "Mechanisms of protein fouling of heat exchangers." Thesis, University of Cambridge, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.357741.

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31

Makhema, Thabo. "Performance evaluation of air-cooled heat exchangers." Thesis, Stellenbosch : Stellenbosch University, 2000. http://hdl.handle.net/10019.1/51872.

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Thesis (MEng)--Stellenbosch University, 2000.<br>ENGLISH ABSTRACT: The main objective of this study to determine the air-side heat transfer and pressure drop performance characteristics of commercially available round and elliptical fined tubes. A . computer code to compare the performance of industrial forced and induced draught aircooled heat exchangers (henceforth referred to as f\CHE's) commonly found in the petrochemical industry is also developed. The comparison is extended to include both round and elliptical finned tubes. From the tests conducted, it is found that there is general

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32

Jones, Gregory Mark. "Quantifying petroleum fouling of refining heat exchangers." Thesis, University of Birmingham, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.690904.

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33

Taherian, Hessam. "Natural convection heat transfer in heat exchangers with vertical helical coils." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0027/NQ31535.pdf.

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34

Delattre, Baptiste. "Monitoring of a heat pump system using deep borehole heat exchangers." Thesis, KTH, Energiteknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-245880.

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Sweden has been one of the first countries in the world to use ground-source heat pumps (GSHP) to supply heating and cooling to its buildings. Today, it is the leading country in Europe and new installations tend to have larger capacities. The use of deeper borehole heat exchangers (BHE) is an opportunity to extract larger amounts of heat over small land areas. However, there are only few case studies on BHE deeper than 300 m, hence such systems may be optimized. This study focuses on a deep GSHP system recently installed in central Stockholm, composed of four 510 m deep BHE. The objectives we

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35

Meyer, Meyer. "Development of a range of air-to-air heat pipe heat recovery heat exchangers." Thesis, Stellenbosch : University of Stellenbosch, 2004. http://hdl.handle.net/10019.1/16389.

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Thesis (MScIng)--University of Stellenbosch, 2004.<br>ENGLISH ABSTRACT: As the demand for less expensive energy is increasing world-wide, energy conservation is becoming a more-and-more important economic consideration. In light of this, means to recover energy from waste fluid streams is also becoming more-and-more important. An efficient and cost effective means of conserving energy is to recover heat from a low temperature waste fluid stream and use this heat to preheat another process stream. Heat pipe heat exchangers (HPHEs) are devices capable of cost effectively salvaging wasted e

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36

Goodman, Christopher L. "Modeling, validation and design of integrated carbon dioxide heat pumps and water heaters." Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/22560.

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37

Harding, Matthew T. "An experimental investigation of the performance of staggered PIN-FIN Array laminar flow heat exchangers." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2005. http://library.nps.navy.mil/uhtbin/hyperion/05Mar%5FHarding.pdf.

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38

Yau, Yat Huang. "Energy savings in tropical HVAC systems using heat pipe heat exchangers (HPHXs)." Thesis, University of Canterbury. Mechanical Engineering, 2004. http://hdl.handle.net/10092/6057.

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In hospitals, where the air must be changed at least 15 times per hour, humidity control is as important as controlling the space temperature. The high air change rate applied in hospitals instantly implies that there would be energy-saving potential in using a heat recovery system between the air being exhausted from the conditioned space and the fresh air being supplied in to replace it. In addition, the fact that in very humid climates the moisture removal requirements often necessitates overcooling air and then reheating it implies that there may be a further opportunity for heat exchange

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39

Lyman, Andrew C. "Spatially Resolved Heat Transfer Studies in Louvered Fins for Compact Heat Exchangers." Thesis, Virginia Tech, 1999. http://hdl.handle.net/10919/9752.

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Understanding the mechanisms that serve to increase heat transfer provides valuable knowledge to minimize the size and maximize the performance of compact heat exchangers. This document presents a detailed experimental heat transfer study of six scaled up louvered fin geometries that are typical of those found in modern louvered fin compact heat exchangers. Heat transfer measurements were performed over a range of Reynolds numbers and with two different boundary conditions. A fully heated boundary condition allowed the effects of the thermal field to be observed while an adiabatic boundary con

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40

Lintern, Andrew Charles. "Applications of two-phase flow and heat transfer in compact heat exchangers." Thesis, Imperial College London, 2008. http://hdl.handle.net/10044/1/10549.

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Three applications of two-phase flow and heat transfer in plate-fin heat exchangers have been studied. A dephlegmator is a heat exchanger in which reflux condensation of a vapour mixture occurs, and plate-fln versions have importance in cryogenic gas separation processes. Numerical calculations for different binary mixtures show that the number of transfer units can be expressed as a simple function of the inlet vapour state and flow rate, heat load, and channel geometry. The calculations also show that the vapour and liquid exit compositions tend to limiting values as the number of transfer u

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41

Rastan, Hamidreza. "Investigation of the heat transfer of enhanced additively manufactured minichannel heat exchangers." Thesis, KTH, Skolan för industriell teknik och management (ITM), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-264278.

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Mini-/microchannel components have received attention over the past few decades owing to their compactness and superior thermal performance. Microchannel heat sinks are typically manufactured through traditional manufacturing practices (milling and sawing, electrodischarge machining, and water jet cutting) by changing their components to work in microscale environments or microfabrication techniques (etching and lost wax molding), which have emerged from the semiconductor industry. An extrusion process is used to produce multiport minichannel-based heat exchangers (HXs). However, geometric man

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42

Liuzzo, Scorpo Alberto. "Heat transfer in borehole heat exchangers and the contribution of groundwater flow." Doctoral thesis, Università degli studi di Trieste, 2014. http://hdl.handle.net/10077/10123.

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2012/2013<br>The exploitation of geothermal heat by ground source heat pumps is presently growing throughout Europe and the world. In Italy, at the end of 2010, borehole heat exchangers covered most of the 30% of the total energy used for space conditioning, showing an increase of 50%compared to 2005. The forecasts for 2015 suggest a further increase in the direct uses of the geothermal heat exceeding 50% compared to 2010 and a corresponding increase in the geothermal energy consumption. The possibility to design plants with higher efﬁciency and lower costs of installation and operation is re

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43

胡少堅 and Siu-kin Wu. "Corrosion and fouling in heat exchangers cooled by sea water from HongKong harbour." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1987. http://hub.hku.hk/bib/B31208010.

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44

Ramthun, David L. "An experimental study of a pin-fin heat exchanger." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03Jun%5FRamthun.pdf.

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45

Pacio, Julio César. "Multiscale thermo-hydraulic modeling of cryogenic heat exchangers." Doctoral thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for energi- og prosessteknikk, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-16090.

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The cryogenic industry has experienced a continuous growth in the last decades, partially sustained by the worldwide development of Liquefaction of Natural Gas (LNG) projects. LNG technology provides an economically feasible way of transporting natural gas over long distances, and currently accounts for nearly 30% of the international trade of this resource. The economic feasibility of these projects, in terms of both capital and operating costs, is to a large extent controlled by the performance of the main cryogenic two-phase flow heat exchanger. This industrial scenario provides then the mo

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46

Magens, Ole Mathis. "Mitigating fouling of heat exchangers with fluoropolymer coatings." Thesis, University of Cambridge, 2019. https://www.repository.cam.ac.uk/handle/1810/287467.

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Fouling is a chronic problem in many heat transfer systems and results in the need for frequent heat exchanger (HEX) cleaning. In the dairy industry, the associated operating cost and environmental impact are substantial. Antifouling coatings are one mitigation option. In this work, the fouling behaviour of fluoropolymer, polypropylene and stainless steel heat transfer surfaces in processing raw milk and whey protein solution are studied. Methodologies to assess the economics of antifouling coatings are developed and applied. Two experimental apparatuses were designed and constructed to study

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47

Righi, Alexandro. "Numerical models and simulations of geothermal heat exchangers." Thesis, KTH, Tillämpad termodynamik och kylteknik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-185816.

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48

Hayes, Niel Martin. "Condensation of CO₂ in brazed plate heat exchangers." Pullman, Wash. : Washington State University, 2009. http://www.dissertations.wsu.edu/Thesis/Summer2009/n_hayes_072209.pdf.

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Thesis (M.S. in mechanical engineering)--Washington State University, August 2009.<br>Title from PDF title page (viewed on Sept. 21, 2009). "School of Engineering and Computer Science." Includes bibliographical references (p. 82-85).

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49

Protheroe, Michael. "Simulation of variable fluid-properties plate heat exchanger for educational purposes thesis submitted in partial fulfilment of the Masters degree in Engineering, Auckland University of Technology, October 2003." Full thesis. Abstract, 2003. http://puka2.aut.ac.nz/ait/theses/ProtheroeM.pdf.

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50

Riahi, Ardeshir. "The use of an approximate integral method to account for intraparticle conduction in gas-solid heat exchangers." Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/25137.

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The mathematical equations describing transient heat transfer between the fluid flowing through a fixed bed and a moving bed of packing were formulated. The resistance to heat transfer within the packing due to its finite thermal conductivity was taken into account. An approximate integral method was applied to obtain an analytical solution to transient response of the bed packing. Results for two cases of fixed and moving bed were obtained. The validity of the approximate method was checked against the more exact method employed by Handley and Heggs who obtained the results for a fixed bed o

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