A 70kW 3-Level Active Neutral Point Clamped Traction Inverter PCB Design for Stray Inductance and Thermal Performance Optimization

Windows are essential in buildings; however, they have poor thermal performance, so extensive research has been conducted on improving their performance. In this study, we developed vacuum-glazed windows with excellent insulation via the in-vacuum method, which shortens the manufacturing time and vacuuming degree considerably. In addition, the configuration of the pillars, low-emissivity (low-e) coating, and frame from a thermal performance perspective was experimentally optimized. The results revealed that the optimal pillar placement spacing is 40 mm and that the low-e coating surface must be located inside the vacuum layer to maximize insulation performance. The vacuum-glazed window produced by the in-vacuum method was applied to an actual residential building to investigate its thermal performance, which was compared with that of a triple-glazed window. The results showed that the center-of-glazing heat flow of the vacuum-glazed window was approximately 0.8 W/m2K lower than that of the triple-glazed window. The difference between the average indoor and outdoor surface temperatures during the nighttime was found to be up to 35.1 °C for the vacuum-glazed window and 23.1 °C for the triple-glazed window. Therefore, the energy efficiency of the building can be greatly improved by applying vacuum windows manufactured via the in-vacuum method and optimized for the best thermal performance.

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System-Level Transient Thermal Analysis for Performance Optimization of High Power Microelectronics

2003 International Electronic Packaging Technical Conference and Exhibition, Volume 2 ◽

10.1115/ipack2003-35213 ◽

2003 ◽

Cited By ~ 1

Author(s):

Victor Adrian Chiriac ◽

Tien-Yu Tom Lee ◽

H. S. Chen

Keyword(s):

Thermal Performance ◽

Performance Optimization ◽

Numerical Study ◽

Optimal Operation ◽

System Level ◽

Main Concern ◽

Efficient Operation ◽

Normal Test ◽

Transient Thermal ◽

Short Time

The increasing trend in power levels and densities leads to the need of design thermal optimization, at either module or system level. A numerical study using finite-volume software was conducted to model the transient thermal behavior of a system including a package dissipating large amounts of power over short time durations. The system is evaluated by choosing the appropriate heat sink for the efficient operation of the device under 100W of constant powering, also to enhance the thermal performance of the enclosure/box containing the test stack-up. The intent of the study is to provide a meaningful understanding and prediction of the high transient powering scenarios. The study focuses on several powering and system design scenarios, identifying the main issues encountered during a normal device operation. The power source dissipates 100W for 2 seconds then is cooled for another 2 seconds. This thermal cycle is likely to occur several times during a normal test-up, and it is the main concern of the manufacturers not to exceed a limit temperature during the device testing operation. The transient trend is further extrapolated analytically to extract the steady state peak temperature values, in order to maintain the device peak temperatures below 120°C. The benefit of the study is related to the possibility to extract the maximum/minimum temperatures for a real test involving a large number of heating-cooling cycles, yet maintaining the initial and peak temperatures within a certain range, for the optimal operation of the device. The flow and heat transfer fields are thoroughly investigated. By using a combination of numerical and analytical study, the thermal performance of the device undergoing infinity of periodic thermal cycles is further predicted.

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Thermal performance optimization of parametric building envelope based on bio-mimetic inspiration

Ain Shams Engineering Journal ◽

10.1016/j.asej.2020.07.007 ◽

2020 ◽

Author(s):

Wael Salah Mansour Abdel-Rahman

Keyword(s):

Thermal Performance ◽

Performance Optimization ◽

Building Envelope

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Thermal performance optimization of microchannels with smoothed corners assuming laminar flow and non-negligible viscous heating

10.1063/1.5138833 ◽

2019 ◽

Author(s):

Marco Lorenzini ◽

Nicola Suzzi

Keyword(s):

Laminar Flow ◽

Thermal Performance ◽

Performance Optimization ◽

Viscous Heating

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Thermal performance optimization of a parabolic trough collector operating with various working fluids using copper nanoparticles.

Journal of Thermal Science and Engineering Applications ◽

10.1115/1.4049872 ◽

2021 ◽

pp. 1-35

Author(s):

Yasser M. Abdullatif ◽

Eric Chekwube Okonkwo ◽

Tareq Al-Ansari

Keyword(s):

Copper Nanoparticles ◽

Thermal Performance ◽

Performance Optimization ◽

Volume Flow Rate ◽

Liquid Sodium ◽

Working Fluid ◽

Inlet Temperature ◽

Parabolic Trough ◽

Pressurized Water ◽

Working Fluids

Abstract This study presents a thermal performance comparison of various working fluids in Parabolic Trough Collectors. Fluids such as gases (helium, carbon dioxide, and air), liquid sodium, and liquids (pressurized water, Therminol VP1, Syltherm 800) are evaluated. This study also examines the efficiency enhancement obtained from the dispersion of copper nanoparticles in water, Therminol-VP1, and Syltherm 800 base fluids. The optimum parameters for nanoparticle concentration, volume flow rate, and inlet temperature to obtain the maximum efficiencies for each working fluid were evaluated in this study. The thermal model used in this study was modelled after the commercially available LS-2 collector, which was designed in the engineering equation solver (EES) and validated with results found in literature. The results of the study show that the Cu/Syltherm 800 nanofluid showed the most enhancement in thermal efficiency with 0.62% while Cu/water and Cu/Therminol VP1 had enhancements of 0.3% and 0.2% respectively.

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