Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 13 of 13 for “"Heat exchanger model"”.
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Development of a biomass gasification pre-treatment system
… performance. This required a thermodynamic model to be developed in order to assess the effect of drying as was highlighted in the literature survey. A heat exchanger model was also developed which formed the basis for the design of the drier. The project aim was to develop a reliable feed …
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TRANSIENT MODELING OF TWO-STAGE AND VARIABLE REFRIGERANT FLOW VAPOR COMPRESSION SYSTEMS WITH FROSTING AND DEFROSTING
… thesis presents the development of an advanced modeling framework for the transient simulation of vapor compression systems. This framework contains a wide range of components and its modular nature enables an arbitrary cycle configuration to be analyzed. One of the highlights of this framework …
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Numerical analysis of the thermal performance of vapour compression heat pump heat exchanger using Python and computational fluids dynamics (CFD)
Numerical analysis on fin and tube heat exchangers contributes towards the implementation of energy-efficient technologies in the industrial and building sectors. Fin and tube heat exchangers are found in various mechanical applications including heating, ventilation, and air conditioning (HVAC) …
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Second law analysis of a liquid cooled battery thermal management system for hybrid and electric vehicles
… to hybrid and electric vehicles. The design is modeled as part of the UOIT EcoCAR. The predominant focus of this indirect liquid cooled system is the entropy generation in each of the components within the system, as well as a total system analysis. Four main components of the system are the …
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Local shell-side coefficients in shell and tube exchanges the use of a mass transfer technique
… in segmentally baffled shell and tube heat exchangers. Corresponding heat transfer data are predicted through the Chilton and Colburn heat and mass transfer analogy. Mass transfer coefficients were measured for baffle spacing lengths of individual tubes in an internal baffle …
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Design considerations of a 15kW heat exchanger for the CSPonD Project
The objective of this work was to develop a 15 kW heat exchanger model for the CSPonD molten salt receiver that will shuttle the molten salt's thermal energy for conversion to electric power. A heat extraction system comprising of an intermediate heat exchanger placed inside the molten salt …
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Performance Analysis of a Large-Scale Ground Source Heat Pump System
… renewable energy sources by 2020. Ground Source Heat Pump (GSHP) systems can play a critical role in reaching these goals within the building sector. Achieving such benefits relies on proper design, integration, installation, commissioning, and operation of these systems. This work seeks to …
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Design and analysis of a natural draft direct dry cooling system for a supercritical carbon dioxide power cycle for CSP application
… work, such an NDDDCS with vertically arranged heat exchangers around the tower circumference is designed and evaluated for a supercritical carbon dioxide (sCO2) power cycle for a concentrated solar power application. The system is configured to house both the precooler (PC) and intercooler (IC) …
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Experimental and modeling study of lubricant effect on refrigerant distribution in microchannel evaporators
Microchannel heat exchanger has been used in industry for decades. But the problem of refrigerant maldistribution can significantly deteriorate the performance of heat exchanger (especially evaporator) and system. In real air conditioning systems especially automobile air conditioning systems where …
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Refrigerant flow distribution in vertical headers of reversible microchannel heat exchangers
An outdoor reversible microchannel heat exchanger, typically having vertical headers and more than two passes, may be used in either air-conditioning or heat pump mode in a reversible system. In heat pump mode, it functions as an evaporator and refrigerant maldistribution among parallel …
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Dynamic modeling, validation, and control for vapor compression systems
This thesis traces the complete process of model-based control design for vapor compression systems (VCSs), from nonlinear model development to linearization and control formulation. Addressing gaps in the previous literature, the equations behind each model and control approach are clearly stated …
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Intermediate vapor bypass: A novel design for mobile heat pump at low ambient temperature
… specs. Passenger thermal comfort, especially heating in cold weather, is usually the largest auxiliary onboard energy user, and can significantly reduce the EV drive range. Heat pumps dramatically reduce the energy consumption for the same heating capacity, hence improves drive range largely. …
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Robust simulation and optimization methods for natural gas liquefaction processes
… that simultaneously change phase and exchange heat at closely-matched cryogenic temperatures. The determination of optimal conditions for a given process will also generally be nontransferable information between LNG plants, as both the specifics of design (e.g. heat exchanger size and …