An analytical design tool for sorber bed heat exchangers of sorption cooling systems

Magnetic fluids with nanoparticles dispersed in water or oils offer attractive applications in biomedicine and industry. Biocompatible magnetic fluids are used for diagnostics and therapy in medical applications, in pharmacy, and biosensors. Application of ferrofluids is expanding into energy conservation, faster and efficient cooling, and hence better performance in a wide variety of practical applications (in heat exchangers, mainly in micro-cooling systems). For the study of the influence of an external magnetic field on the aggregation processes of magnetic nanoparticles in magnetic fluids, acoustic spectroscopy was used. The jump changes of the magnetic flux density at various temperatures influenced the acoustic attenuation. The measured changes were results of nanoparticle aggregations into new structures.

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An analytical design tool for pin fin sorber bed heat/mass exchanger

International Journal of Refrigeration ◽

10.1016/j.ijrefrig.2021.07.027 ◽

2021 ◽

Author(s):

M.J. Darvish ◽

H. Bahrehmand ◽

M. Bahrami

Keyword(s):

Design Tool ◽

Analytical Design ◽

Pin Fin ◽

Mass Exchanger

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Model Predictive Control of a Pumped Two-Phase Cooling System With Microchannel Heat Exchangers

Volume 2: Control and Optimization of Connected and Automated Ground Vehicles; Dynamic Systems and Control Education; Dynamics and Control of Renewable Energy Systems; Energy Harvesting; Energy Systems; Estimation and Identification; Intelligent Transportation and Vehicles; Manufacturing; Mechatronics; Modeling and Control of IC Engines and Aftertreatment Systems; Modeling and Control of IC Engines and Powertrain Systems; Modeling and Management of Power Systems ◽

10.1115/dscc2018-9143 ◽

2018 ◽

Author(s):

Oyuna Angatkina ◽

Andrew Alleyne

Keyword(s):

Heat Flux ◽

Model Predictive Control ◽

Predictive Control ◽

Heat Exchangers ◽

Cooling System ◽

High Heat ◽

High Heat Flux ◽

Two Phase ◽

Cooling Systems ◽

Two Phase Cooling

Two-phase cooling systems provide a viable technology for high–heat flux rejection in electronic systems. They provide high cooling capacity and uniform surface temperature. However, a major restriction of their application is the critical heat flux condition (CHF). This work presents model predictive control (MPC) design for CHF avoidance in two-phase pump driven cooling systems. The system under study includes multiple microchannel heat exchangers in series. The MPC controller performance is compared to the performance of a baseline PI controller. Simulation results show that while both controllers are able to maintain the two-phase cooling system below CHF, MPC has significant reduction in power consumption compared to the baseline controller.

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PREFACE: HEAT AND MASS TRANSFER IN SORPTION COOLING SYSTEMS

Heat Transfer Research ◽

10.1615/heattransres.v46.i4.10 ◽

2015 ◽

Vol 46 (4) ◽

pp. v-vi

Author(s):

Ruzhu Wang ◽

Liwei Wang

Keyword(s):

Mass Transfer ◽

Heat And Mass Transfer ◽

Cooling Systems ◽

Sorption Cooling

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On Thermal Expansion Induced Stresses in U-Bends of Shell-and-Tube Heat Exchangers

Journal of Engineering for Power ◽

10.1115/1.3446633 ◽

1979 ◽

Vol 101 (4) ◽

pp. 634-639 ◽

Cited By ~ 5

Author(s):

Krishna P. Singh ◽

Maurice Holtz

Keyword(s):

Thermal Expansion ◽

Heat Exchangers ◽

Structural Characteristics ◽

Design Tool ◽

Design Variables ◽

Depth Study ◽

Shell And Tube ◽

Induced Stresses ◽

Critical Regions ◽

Effective Design

An analytical method is herein developed to evaluate the stress field in the critical regions of a U-tube subject to differential thermal expansion. The solution is intended to be used as a design tool to conveniently study the variation of geometric parameters on the U-tube stress distribution. Those design variables which have significant effects on the structural characteristics of the U-tube are identified by an in-depth study of a typical example problem. Some effective design remedies are also discussed.

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