MMS Optical Bench Assembly (OBA) Thermal Design Validation and Thermal Model Correlation

2013 ◽  
Author(s):  
Rommel Zara ◽  
Richard J. D'Antonio
Keyword(s):  
Thermal Model ◽  
Thermal Design ◽  
Optical Bench ◽  
Design Validation ◽  
Model Correlation

scholarly journals NUMERICAL THERMAL MODEL OF AN INCANDESCENT LAMP FOR SATELLITES TESTING

2020 ◽  
pp. 50-58
Author(s):  
Dmitriy Kulikov ◽  
Keyword(s):  
Mathematical Modeling ◽  
Thermal Model ◽  
High Efficiency ◽  
Complex Problem ◽  
Thermal Design ◽  
Halogen Lamp ◽  
Quality Model ◽  
Good Convergence ◽  
The Monte Carlo Method ◽  
Model Generator

In the present article the author gives the results work to create a numerical thermal model of infrared (IR) emitter on the base of tubular halogen lamp (THL) KGT-220-1300, as one of the elements of the equipment used when conducting thermal vacuum tests (TVT) of satellites. As a tool to solve complex problem of heat transfer used software Thermal Model Generator. Variants of calculations for the operation of the lamp at different voltages are carried out. The results of mathematical modeling using band approximation of the properties of the system elements in combination with the Monte Carlo method in solving the problem of heat exchange by radiation showed high efficiency. The performed analysis of the correctness of the results showed good convergence with the data of previous experiments on measuring the temperature of the quartz bulb, which confirms the reliability of the results. Getting a high-quality model of this type at the disposal of satellite thermal engineer is an important step in the complex work aimed at conducting end-to-end mathematical modeling of satellite thermal design, and will also solve a number of issues related to the methodological support of TVT, their implementation and optimization.

Thermal Design of a Hierarchical Radially Expanding Cavity for Two-Phase Cooling of Integrated Circuits

2015 ◽  
Author(s):  
Arvind Sridhar ◽  
Chin Lee Ong ◽  
Stefan Paredes ◽  
Bruno Michel ◽  
Thomas Brunschwiler ◽  
...  
Keyword(s):  
Design Process ◽  
Thermal Model ◽  
Thermal Design ◽  
Design Flow ◽  
Qualitative Description ◽  
System Level ◽  
Two Phase ◽  
Ongoing Research ◽  
Level Pressure ◽  
Phase Liquid

A major challenge in the implementation of evaporative two-phase liquid-cooled ICs with embedded fluid microchannels/cavities is the high pressure drops arising from evaporation-induced expansion and acceleration of the flowing two-phase fluid in small hydraulic diameters. Our ongoing research effort addresses this challenge by utilizing a novel hierarchical radially expanding channel networks with a central embedded inlet manifold and drainage at the periphery of the chip stack. This paper presents a qualitative description of the thermal design process that has been adopted for this radial cavity. The thermal design process first involves construction of a system-level pressure-thermal model for the radial cavity based on both fundamental experiments as well as numerical simulations performed on the building block structures of the final architecture. Finally, this system-level pressure-thermal model can be used to identify the design space and optimize the geometry to maximize thermal performance, while respecting design specifications. This design flow presents a good case study for electrical-thermal co-design of two-phase liquid cooled ICs.

Transient and Steady-State Thermal Design Evaluation of a Carbon Monoxide Gas Sensor Using CFD Tool

1998 ◽  
Vol 120 (2) ◽  
pp. 135-140 ◽  
Author(s):  
T.-Y. Tom Lee ◽  
R. Sharma ◽  
A. Peyre-Lavigne
Keyword(s):  
Carbon Monoxide ◽  
Gas Sensor ◽  
Thermal Model ◽  
Chemical Sensor ◽  
Low Cost ◽  
Complex Structure ◽  
Temperature Response ◽  
Thermal Design ◽  
High And Low Temperatures ◽  
Sensor Package

This paper summarizes thermal modeling work performed on the Motorola Carbon Monoxide (CO) chemical sensor. Gas sensors need low cost reliable packages, good thermal operation, and low power consumption. The goal is to provide a validated thermal model of a gas sensor and its package and to develop a sensor design capability with reduced design cycle time. Due to the complex structure of the sensor package, a computational fluid dynamics (CFD) tool was used to analyze the heat transfer and fluid flow within the package. Based on the validated model, parametric studies on filter location and package orientation were performed. In order to minimize the influence of humidity, the sensor is toggled between high and low temperatures by applying 5 volts for 5 s of heating, and 1 volt for 10 s of cooling. Transient thermal analysis was also performed to predict the temperature response of various components. A detailed description of the thermal model and its results are described in the paper.

Investigation Regarding Transient Compact Thermal Model for Microprocessor Packages

2019 ◽  
Author(s):  
Koji Nishi
Keyword(s):  
Power Efficiency ◽  
Thermal Model ◽  
Three Dimensional ◽  
Transient State ◽  
Thermal Control ◽  
Computing System ◽  
Thermal Simulation ◽  
Thermal Design ◽  
Time Step ◽  
Transient Thermal

Abstract In recent years, not only static thermal design but also realtime thermal control become important for power efficiency on computing systems. Three-dimensional thermal simulation is widely used to design computing system, however, it takes too long time for intelligent power and thermal management validation because it requires transient thermal simulation with very short time step. To enable rapid simulation environment, compact thermal model which can be employed with both three-dimensional transient thermal simulation and transient thermal network is required. Therefore, this research aims to establish transient state compact thermal model for microprocessor package. This paper briefly introduces steady state compact thermal model for microprocessor, which is proposed as previous work, then, points out key point to extend the model to transient state model. Transient thermal spreading resistance is emulated and the effect is checked by comparing with three-dimensional simulation.

Thermal Design and Characteristics of Thermal Distribution in Process Chamber

2005 ◽  
Author(s):  
Y. H. Zheng ◽  
R. S. Amano
Keyword(s):  
Thermal Model ◽  
Thermal Design ◽  
Computational Fluid Mechanics ◽  
Rapid Manufacturing ◽  
Machine Process ◽  
Future Design ◽  
Critical Effect ◽  
Thermal Distribution ◽  
Numerical Studies ◽  
And Control

Thermal distribution has a critical effect on prototyping accuracy in rapid prototyping and rapid manufacturing. Any uneven thermal distribution in the work bed of the prototyping machine process chamber will result in product distortion. In order to optimize the thermal distribution enhance product accuracy of product and guide future design efforts, a full understanding is necessary, of the characteristics of thermal distribution in the process chamber. This study focuses on how to design and control thermal distribution in the process chamber due to natural convection with experimental and numerical thermal model. For optimal thermal design, the computational fluid mechanics (CFD) approach is one of the most powerful tools. Both experimental and numerical studies of six design configurations for different source heater locations and baffle configurations are presented in this paper.

Thermal Model of a Gas Fired Generator for an Absorption GAX Cooling System

2008 ◽  
Author(s):  
A. Vidal ◽  
M. A. Barrera-Chavarri´a ◽  
V. H. Go´mez ◽  
J. Cervantes ◽  
R. Best
Keyword(s):  
Thermal Model ◽  
Convection Zone ◽  
Cooling System ◽  
Water Solution ◽  
Thermal Design ◽  
Heat Radiation ◽  
Combustion Gases ◽  
Absorption Cooling ◽  
Fortran 90 ◽  
Absorption Cooling System

A numerical model of a direct fired generator is presented. The objective is to provide a baseline for designing the prototype of a gas fired generator, aimed to drive a GAX absorption cooling system. The model was carried out using Fortran 90. The gas fired generator will be part of the hybrid 10.5 kW GAX cooling system, which is being designed to operate with solar energy and direct fired by LPG combustion. The prototype is designed in two sections. In the first section, the “U” form combustion chamber is flooded with ammonia-water solution, the heat radiation from the flame and the hot combustion gases are absorbed by the tube walls and transferred to the solution. In the second section (the convection zone), the combustion gases are used to increase the concentration of the ammonia refrigerant. Thermal design results in the radiation, boiling and convection zones are presented and discussed, while the manufacturing strategies are being analyzed to produce a compact and efficient prototype.

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