A5073182936- Heat Transfer and Optimization
- Heat Transfer and Boiling Studies
- Spacecraft and Cryogenic Technologies
- Advanced Multi-Objective Optimization Algorithms
- Spacecraft Design and Technology
- Refrigeration and Air Conditioning Technologies
- Electronic Packaging and Soldering Technologies
- Solar Thermal and Photovoltaic Systems
- Metaheuristic Optimization Algorithms Research
- Light effects on plants
- Spacecraft Dynamics and Control
- Radiation Therapy and Dosimetry
- Spaceflight effects on biology
- Induction Heating and Inverter Technology
- Engine and Fuel Emissions
- Topology Optimization in Engineering
- Process Optimization and Integration
- Icing and De-icing Technologies
- Radiative Heat Transfer Studies
- Fluid Dynamics and Turbulent Flows
- Thermal Analysis in Power Transmission
- Wind and Air Flow Studies
- Fluid Dynamics and Heat Transfer
- Engineering Applied Research
- Wireless Sensor Networks for Data Analysis
National Institute for Space Research
2005-2020
Abstract In this paper, an application of the Generalized Extremal Optimization (GEO) algorithm to optimization a heat pipe (HP) for space is presented. The GEO generalization (EO) algorithm, devised be applied readily broad class design problems regardless complexity it would face. It easy implement, does not make use derivatives, and can either unconstrained or constrained with continuous, discrete, integer variables. has been tested in series test functions shows competitive other...
This paper presents a mathematical model of LHP, where its results were compared with experimental test and the LHP behavior was predicted for Space conditions. In condenser, condensate film thickness in tube is determined by solution conjugate equations energy, momentum mass balance control volume. Evaporator compensation chamber are both described few transient nodes generalized key parameters, whose values adjusted results. Experimental consists cylindrical stainless steel evaporator an...
A new configuration of internal geometry LHP evaporator is investigated. Cylindrical has circumferential vapor escape channels instead axial channels, commonly used in evaporators; only one groove presented to provide collection and direction the line. These grooves are combined with micro-threads on case surface. Mathematical model been developed emphasis simulation heat-mass transfer evaporator. The was verified by test results obtained for axial-groove wick then modified applied geometry....
A new concept of space radiator variable emittance for satellite thermal control is presented. The composed two stages which exchange heat through radiation between finned surfaces covered with coatings, whose emissivity increased temperature. Under cold conditions the radiative coupling minimal, preventing equipment subcooling, while in hot increased. steady-state mathematical model was developed and numerically coupled to an optimization algorithm, a design procedure performed. Two...
Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation Valeri V. Vlassov, Fabiano L. de Sousa, Roger R. Riehl; Design Optimization of Loop Heat Pipes with Cylindrical Evaporator Integral Reservoir for Space Application. AIP Conf. Proc. 21 January 2008; 969 (1): 138–145. https://doi.org/10.1063/1.2844960 Download citation file: Ris (Zotero) Reference Manager EasyBib...
Electronic components are normally assembled to printed circuit boards (PCBs). Such generate heat in operation which must be conducted away efficiently from the small mounting areas frames where PCB is fixed. The temperature of component depends on dissipation rate, technology and parameters mounting, placement finally effective thermal conductivity (keff) board. some may reach significant magnitudes over 100°C while frame kept at near-ambient temperature. reliability electronic directly...
We present analytical models and a detailed numerical model of two-stage space radiator with variable emissivity coating on its internal surfaces we correlate them experimental data to validate the model. The feasibility concept called VESPAR (Variable Emittance SPAce Radiator) is proven using an confirmed by This then used compare thermal performance conventional flat radiator. comparison that for satellite control could lead power savings survival electric heaters or even elimination.
the heat pipe (HP) performance under low temperatures is theoretically studied.The developed mathematical model describes HP behavior conditions when locations of evaporator and condenser sections are not defined a priori can eventually be changed during operation.Typical application such configuration thermo-stabilized structural honeycomb panel satellites.Usually ammonia used in these applications; however acetone investigated as hazardous alternative working fluid.This paper aims to...
This work presents the design and characteristics of a new compact ultraviolet (UV) irradiator used in biological onboard space flight experiment. The experiment, called DRM, took place International Space Station research facility (ISS-13 expedition), during Centenary Mission (Russian-Brazil) March-April 2006. DRM main objective was to correlate DNA repair mechanism mutagenesis with microgravity. A apparatus designed for allow situ induced radiation space. apparatus, CIM, uses UV-A...