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 12 of 12 for “"Microchannel heat exchanger"”.
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Coupling complex microchannel heat exchanger CFD with plug flow and Poiseuille flow models
Microchannel heat exchanger simulation provides a means to obtain design predictions at low cost and quick turnaround. Using computational fluid dynamics to solve the conjugate heat transfer problem, key output metrics such as overall pressure drop, heat exchanger effectiveness, and heat exchanger …
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Performance and optimization of microchannel condensers
… study is the first to document the condensation heat transfer performance of small diameter, microchannel tubes in crossflow heat exchange, and this study provides the first systematic evaluation of the effect of port shape on microchannel tube performance. Furthermore, this study is the first to …
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Experimentally validated models of refrigerant distribution in microchannel heat exchangers used to evaluate charge reduction of various working fluids
… developed to obtain accurate prediction of microchannel heat exchanger performance and charge. Effects of using various correlations are presented and discussed with focus on microchannel condensers and evaporators. Experiments with different refrigerants including R290, R717, R1234yf, and …
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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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Multiscale computational simulation of multidimensional chemically reacting flow over washcoated heterogeneous catalysts
… The simulation and evaluation of a novel ceramic microchannel heat exchanger; the adaptation of in situ adaptive tabulation for the acceleration of transient, heterogeneous chemistry in large CFD models; and the development of catalytic washcoat performance relations informed by 3D reconstructions …
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Pressure drop in headers of microchannel heat exchangers
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2024-05-01
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Study of the effects of external corrosion on the thermal-hydraulic performance of brazed aluminum microchannel heat exchangers
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2026-12-01
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Fundamental understanding of condensation frosting and precise detection with capacitive sensors
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2024-12-01
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Flash gas bypass - a way to improve distribution of adiabatic two-phase refrigerant flow in headers of microchannel evaporators
… of parallel flow evaporators, of typically microchannel design. Three main issues that will be explored in this thesis are: 1) separation of vapor-liquid refrigerant immediately after an expansion device in a compact T-junction and design options to enhance its performance; 2) effects of …
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The performance of a reversible R744 vapor compression system with an internal heat exchanger in continuous frosting/ defrosting cycles
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2024-08-01
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Periodic reverse flow in microchannel evaporators
… a very commonly seen phenomenon in small scale heat removal applications, for instance, microchannel heat sinks for cooling of electronics. Due to the industry’s strict requirement for thermal stability, previous research on flow instabilities in microchannels has been largely focused on heat …