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Computational Study of the Heat Transfer and Fluid Structure of a Shell and Tube Heat Exchanger
Title
Computational Study of the Heat Transfer and Fluid Structure of a Shell and Tube Heat Exchanger.
Creator
Betancourt, Arturo, Curet, Oscar M., Florida Atlantic University, College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
Abstract/Description
A common technique to improve the performance of shell and tube heat exchangers (STHE) is by redirecting the flow in the shell side with a series of baffles. A key aspect in this technique is to understand the interaction of the fluid dynamics and heat transfer. Computational fluid dynamics simulations and experiments were performed to analysis the 3-dimensional flow and heat transfer on the shell side of an STHE with and without baffles. Although, it was found that there was a small...
Show moreA common technique to improve the performance of shell and tube heat exchangers (STHE) is by redirecting the flow in the shell side with a series of baffles. A key aspect in this technique is to understand the interaction of the fluid dynamics and heat transfer. Computational fluid dynamics simulations and experiments were performed to analysis the 3-dimensional flow and heat transfer on the shell side of an STHE with and without baffles. Although, it was found that there was a small difference in the average exit temperature between the two cases, the heat transfer coefficient was locally enhanced in the baffled case due to flow structures. The flow in the unbaffled case was highly streamed, while for the baffled case the flow was a highly complex flow with vortex structures formed by the tip of the baffles, the tubes, and the interaction of flow with the shell wall.
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Date Issued
2016
PURL
http://purl.flvc.org/fau/fd/FA00004569, http://purl.flvc.org/fau/fd/FA00004569
Subject Headings
Computational fluid dynamics., Thermodynamics., Heat exchangers--Design and construction., Heat--Transmission--Computer programs.
Format
Document (PDF)
Complete thermal design and modeling for the pressure vessel of an ocean turbine -
Title
Complete thermal design and modeling for the pressure vessel of an ocean turbine -: a numerical simulation and optimization approach.
Creator
Kaiser, Khaled., College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
Abstract/Description
This thesis is an approach of numerical optimization of thermal design of the ocean turbine developed by the Centre of Ocean Energy and Technology (COET). The technique used here is the integrated method of finite element analysis (FEA) of heat transfer, artificial neural network (ANN) and genetic algorithm (GA) for optimization purposes.
Date Issued
2009
PURL
http://purl.flvc.org/FAU/369194
Subject Headings
Thermal analysis, Computer programs, Heat exchangers, Design and construction, Marine turbines, Testing, Mathematical models, Fluid dynamics
Format
Document (PDF)
Study of high temperature PEM fuel cell (HT-PEMFC) waste heat recovery through ejector based refrigeration
Title
Study of high temperature PEM fuel cell (HT-PEMFC) waste heat recovery through ejector based refrigeration.
Creator
Fuchs, Michel., College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
Abstract/Description
The incorporation of an ejector refrigeration cycle with a high temperature PEM fuel cell (HT-PEMFC) presents a novel approach to combined heat and power (CHP) applications. An ejector refrigeration system (ERS) can enhance the flexibility of a CHP system by providing an additional means of utilizing the fuel cell waste heat besides domestic hot water (DHW) heating. This study looks into the performance gains that can be attained by incorporating ejector refrigeration with HT-PEMFC micro-CHP ...
Show moreThe incorporation of an ejector refrigeration cycle with a high temperature PEM fuel cell (HT-PEMFC) presents a novel approach to combined heat and power (CHP) applications. An ejector refrigeration system (ERS) can enhance the flexibility of a CHP system by providing an additional means of utilizing the fuel cell waste heat besides domestic hot water (DHW) heating. This study looks into the performance gains that can be attained by incorporating ejector refrigeration with HT-PEMFC micro-CHP (mCHP) systems (1 to 5kWe). The effectiveness of the ERS in utilizing fuel cell waste heat is studied as is the relulting enhancement to overall system efficiency. A test rig specially constructed to evaluate an ERS under simulated HT-PEMFC conditions is used to test the concept and verify modeling predictions. In addition, two separate analytical models were constructed to simulate the ERS test rig and a HT-PEMFC/ERS mCHP system. The ERS test rig was simulated using a Matlab based model, while two residential sized HT-PEMFC/ERS mCHP systems were simulated using a Simulink model. Using U.S. Energy Information Administration (EIA) air conditioning and DHW load profiles, as well as data collected from a large residential monitoring study in Florida, the Simulink model provides the results in system efficiency gain associated with supporting residential space cooling and water heating loads. It was found that incorporation of an ERS increased the efficiency of a HT-PEMFC mCHP system by 8 t0 10 percentage points over just using the fuel cell waste heat for DHW. In addition, results from the Matlab ERS test rig model were shown to match well with experimental results.
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Date Issued
2012
PURL
http://purl.flvc.org/FAU/3355557
Subject Headings
Proton exchange membrane fuel cells, Fuel cells, Mathematical models, Heat exchangers, Design and construction, Renewable energy sources
Format
Document (PDF)